National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT
Egyptian Journal of Chemistry
0449-2285
2357-0245
62
3
2019
03
01
Dating The Ballpoint Pen Inks Using Gas Chromatography-Mass Spectrometry Technique
385
400
EN
Mohamed
Mohsen
El-sabbah
Physical Chemistry, Faculty of Science, Al-Azhar University
mmbel_sabbah@hotmail.com
Abdelaziz
Zaki
Gomaa
Former Quality Control Director of Pachin Co.
gomaa11@yahoo.com
Dalia
elhafny
0000-0003-3971-2542
Pesticides Residues and Environmental Pollution, Central Agricultural Pesticides Laboratory, Agricultural Research Center, Giza, Egypt
dalia_elhafny@yahoo.com
Ahmed
Soliman
Al-Hawary
Forensic Medicine Authority
qdeahmedsoliman1@gmail.com
10.21608/ejchem.2018.4812.1427
The study of aging of valuable documents is asked by the Forensic Medicine in Egypt. Eight ballpoint pens; commonly used in Egypt were chosen for this study. The aging was studied kinetically by measuring the solvent concentration of 2-phenoxyethanol overtime by the GC-MS. The ink aging curves were plotted, using the solvent volatility ratio was an effective means of determining the chronological age of the ballpoint pen inks. Our technique was demonstrated by examining tow printed forms of the trust receipts. It was found that determining the ink date is valid and can be trusted. A simple equation is proposed that can be applied for the prediction of ink dating.
Ballpoint pen ink,questioned document,a valuable document,ink dating,ink aging,2-phenoxyethanol,GC-MS
https://ejchem.journals.ekb.eg/article_16876.html
https://ejchem.journals.ekb.eg/article_16876_c5302cfd92fc04ead038e04293fde911.pdf
National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT
Egyptian Journal of Chemistry
0449-2285
2357-0245
62
3
2019
03
01
Microwave Irradiation Synthesis and Breast Carcinoma of 6-ethoxy-2-(2-methoxy- benzylideneamino)benzothiazole and Its Metal Complexes
401
414
EN
Ali M.
Hassan
Chemistry Dept, Faculty of Science, Al-Azhar University, Nasr City,11884, Cairo, Egypt.
Bassem H.
Heakal
Research Laboratory, Cairo Oil Refining Company, Mostorod, Kaliobia, Egypt.
Osama
Soliman
Chemistry Dept, Faculty of Science, Al-Azhar University, Nasr City,11884, Cairo, Egypt.
K.
Abdalla
Physics Dept., Faculty of Science, Al-Azhar University, Nasr City, 11884, Cairo, Egypt.
Wael
Abo El-ata
Faculty of Medicine, Al-Azhar University, Domiate City, Egypt.
waelsfy@gmail.com
10.21608/ejchem.2018.4444.1401
Efficient and clean synthesis of Schiff base as a new ligand, 6-ethoxy-2-(2-methoxy benzylideneamino)benzothiazole has been synthesized in equimolar reaction of 2-amino-6-ethoxy-benzothiazole with 2-methoxy benzaldehyde using microwave technique. The prepared Schiff base was reacted with some transition metal ions Ni(II), Cu(II), Pd(II), Ag(I) and Au(III) in equimolar ratio (M:L, 1:1) using microwave technique. The stereochemistry and the bonding characteristics of the ligand and its complexes were achieved based on elemental analysis, FT-IR, UV-Vis., 1HNMR and ESR as well as Thermo-Gravimetric Analysis (TGA). The thermal dehydration and decomposition of Ni(II), Cu(II) and Ag(I) complexes were studied kinetically using the integral method applying the Coats–Redfern and Horowitz Metzger equations. The reactivity of ligand and its Au(III) complex were studied against breast carcinoma cell. The antimicrobial activity of ligand and its Ag(I) complex studied against the bacterial (positive and negative) grams and fungal strains.
Microwave synthesis,Breast cancer and Thermal analysis
https://ejchem.journals.ekb.eg/article_16874.html
https://ejchem.journals.ekb.eg/article_16874_3d09f1601e86b3e39e6879bad32ba0d7.pdf
National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT
Egyptian Journal of Chemistry
0449-2285
2357-0245
62
3
2019
03
01
High Exhaustion of Chrome Tan, Enhancement of Leather Properties and Reduction of Chrome Tanning Effluent Impact
415
428
EN
Elshahat
Nashy
0000-0003-1721-2440
Chemical Industries Res Div, NRC Egypt
nashy_eha@yahoo.com
Kamal A.
Eid
Spectroscopic Dept., National ResearchCentre, 33 El-behoose St., Dokki, Cairo, Egypt.
10.21608/ejchem.2018.4393.1387
THE LEATHER industry faces very challenging task because of the regulations enforced by the various pollution control bodies to maintain the discharged norms of the chemical in the treated water. From an environmental stand point, one of the most significant waste is the chromium species because it posses a serious disposal problem to human health and the environment. Therefore, chrome tan effluent is critically analyzed for the harmful effects due to the incomplete exhaustion of the hazardous chrome cations in tanning bath. The paper has focused on the challenges/impacts of chrome tanning effluent and evaluates the alternative treatment options. Reducing agents namely; sodium bisulphite (NaHSO3), sodium thiosulphate (Na2S2O3) in connection with hydroxy carboxylic acids and /or basifying agents were used to enhance the exhaustion, fixation of chrome tan and shrinkage temperature as well as strength properties of the tanned leather. In addition, the leather quality is one of the important factors taking into consideration. The optimum conditions for exhaustion, fixation, shrinkage temperature as well as leather quality showed that both NaHSO3 and Na2S2O3 have a similar effect in connection with basic oxide of 1.5% magnesium oxide (most effective one) and the best modifying agent is tartaric acid (3%), temperature of 35ºC. The best results obtained are 93.51% exhaustion, 93.71% fixation and 121ºC shrinkage temperature in aqueous medium.<br />The present work was devoted to change the primary condition of tanning process based on the modification of pelt to increase the high exhaustion of chrome tan which consequently, leads to lower the levels of unused chrome in the tanning effluent and minimized the deficit existing from the environmental point of view. The obtained results showed that, over 90% reduction of the chrome concentration in effluent and 80% reduction of the COD. The assessment was demonstrated that the modification process exhaust, and fixed of chrome tan, improve leather properties, reduced the environmental impact and at the same time saves energy and time than the traditional one.<br /> The leather industry faces very challenging task because of the regulations enforced by the various pollution control bodies to maintain the discharged norms of the chemical in the treated water. From an environmental stand point, one of the most significant waste is the chromium species because it posses a serious disposal problem to human health and the environment. Therefore, chrome tan effluent is critically analyzed for the harmful effects due to the incomplete exhaustion of the hazardous chrome cations in tanning bath. The paper has focused on the challenges/impacts of chrome tanning effluent and evaluates the alternative treatment options. Reducing agents namely; sodium bisulphite (NaHSO3), sodium thiosulphate (Na2S2O3) in connection with hydroxy carboxylic acids and /or basifying agents were used to enhance the exhaustion, fixation of chrome tan and shrinkage temperature as well as strength properties of the tanned leather. In addition, the leather quality is one of the important factors taking into consideration. The optimum conditions for exhaustion, fixation, shrinkage temperature as well as leather quality showed that both NaHSO3 and Na2S2O3 have a similar effect in connection with basic oxide of 1.5% magnesium oxide (most effective one) and the best modifying agent is tartaric acid (3%), temperature of 35ºC. The best results obtained are 93.51% exhaustion, 93.71% fixation and 121ºC shrinkage temperature in aqueous medium. <br />The present work was devoted to chang the primerycondtion of tanning process based on the modification of pelt to increase the high exhaustion of chrome tan which consequently, leads to lower the levels of unused chrome in the tanning effluent and minimized the deficit existing from the environmental point of view. The obtained results showed that, over 90% reduction of the chrome concentration in effluent and 80% reduction of the COD. The assessment was demonstrated that the modification process exhauste, and fixed of chrome tan, improve leather properties, reduced the environmental impact and at the same time saves energy and time than the traditional one.
Environmental Impact,Chrome Tan,Reducing agent,Chrome Exhaustion and Fixation,Shrinkage Temperature,Hydroxy carboxylic acid,Basifying agent
https://ejchem.journals.ekb.eg/article_17169.html
https://ejchem.journals.ekb.eg/article_17169_c35dd2a8068c5eec4bf2eff87ecab451.pdf
National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT
Egyptian Journal of Chemistry
0449-2285
2357-0245
62
3
2019
03
01
Rapid RP-HPLC Method for Simultaneous Estimation of Some Antidiabetics; Metformin, Gliclazide and Glimepiride in Tablets.
429
440
EN
Mahmoud M.
Sebaiy
0000-0002-5949-2834
Medicinal Chemistry Department, Faculty of Pharmacy, Zagazig University, Egypt.
sebaiym@gmail.com
Sobhy M.
El-Adl
Medicinal Chemistry Department, Faculty of Pharmacy, Zagazig University, Egypt.
sobhyeladl@yahoo.com
Mohamed M.
Baraka
Medicinal Chemistry Department, Faculty of Pharmacy, Zagazig University, Egypt.
m3baraka@yahoo.com
Amira A.
Hassan
Medicinal Chemistry Department, Faculty of Pharmacy, Zagazig University, Egypt.
amiraali_mero@yahoo.com
10.21608/ejchem.2018.4394.1388
An isocratic RP-HPLC method has been developed for rapid and simultaneous separation and estimation of three antidiabetics drugs, metformin, gliclazide and glimepiride in tablet dosage forms within 6 minutes. Separation was carried out on a Thermo Scientific® BDS Hypersil C8 column (5µm, 2.50 x 4.60 mm) using a mobile phase of MeOH : 0.025M KH2PO4 adjusted to pH 3.20 using ortho - phosphoric acid (70 : 30, v/v) at ambient temperature. The flow rate was 1 mL/min and UV detection was set at 235 nm. The retention time of metformin, gliclazide and glimepiride was noted to be 3.06, 4.33 and 6.00 minutes respectively, indicating a very short analysis time rather than other reported methods. Also, limits of detection were reported to be 0.05, 1.21 and 0.11 µg/mL for metformin, gliclazide and glimepiride, respectively, showing a high degree of the method sensitivity. The method was then validated according to ICH guidelines where it was found to be accurate, reproducible and robust. Finally, the method was compared statistically with reference methods indicating that there is no significant difference between them in respect of precision and accuracy.
RP-HPLC,Metformin,Gliclazide,Glimepiride,Tablets
https://ejchem.journals.ekb.eg/article_17430.html
https://ejchem.journals.ekb.eg/article_17430_7c5dc1ab77b53092018f88362aeb8cbf.pdf
National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT
Egyptian Journal of Chemistry
0449-2285
2357-0245
62
3
2019
03
01
Highly Sensitive Method for Analysis Anticholinesterase Drugs
441
449
EN
Elmorsy
Khaled
0000-0002-4042-9800
Microanalysis Laboratory, Applied Organic Chemistry
Department, National Research Centre, El Bohouthst.,
Dokki, 12622-Giza, Egypt
elmorsykhaled@yahoo.com
Hassan
Naguib Ahmed
Hassan
Microanalysis Laboratory, Applied Organic Chemistry
Department, National Research Centre, El Bohouthst.,
Dokki, 12622-Giza, Egypt
hassanhna@yahoo.com
Mona
Abdelaziz
Ahmed
Department of Chemistry, College of Women for Art, Science and Education, Ain Shams University, Egypt
abdelaziz.mona@gmail.com
R.O.
El-Attar
Microanalysis Laboratory, Applied Organic Chemistry
Department, National Research Centre, El Bohouthst.,
Dokki, 12622-Giza, Egypt
10.21608/ejchem.2018.4591.1409
THE PRESENT study described a novel application of simple potentiometric biosensors for analysis of anti-cholinesterase (Alzheimer) drugs in vitro. The proposed method was based on inhibition of acetylcholineesterase enzyme (AChE) by Alzheimer drugs namely; donepezil (DOP) and galantamine (GAL) in addition to biperdien (BP) and ipratropium (IPBr). Based on the relative inhibition action of drug on AChE activity, different sensitivities were recorded ranging between 0 to 18.0 ng, 0 to 90.0 ng, 0 to 4.69 μg and 0 to 9.96 μg mL-1for the aforementioned drugs in the same order depending on the nature of drugs and their corresponding LD50 values. The proposed procedures were successfully applied for determination of drugs in pharmaceutical formulation and biological samples with sensitivity and accuracy comparable with the official method. The presented approach can be suggested for testing of pharmaceutical preparation toxicity against cholinesterase enzymes in vitro.
Alzheimer drug,Cholinesterase,Disposable biosensor,Pharmaceutical analysis
https://ejchem.journals.ekb.eg/article_15810.html
https://ejchem.journals.ekb.eg/article_15810_6c99bf675a3b0431efb7c88e35c32f09.pdf
National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT
Egyptian Journal of Chemistry
0449-2285
2357-0245
62
3
2019
03
01
Synthesis and Characterization of Ion Exchanger based on Waste Cotton for Dye Removal from Wastewater
451
468
EN
A.I.
Waly
Preparingand Finishing Department, National Research Centre, Cairo, Egypt
draiwaly@hotmail.com
M.A.
Khedr
Chemical Engineering Department, National Research Centre, Cairo, Egypt.
maalykhedr@yahoo.com
H.M.
Ali
0000-0003-2778-9868
Chemical Engineering Department, National Research Centre, Cairo, Egypt.
hanaa_aly@hotmail.com
B.Y.
Riad
ChemistryDepartment, Faculty of Science, Cairo University, Egypt
I.M.
Ahmed
Chemical Engineering Department, National Research Centre, Cairo, Egypt.
islamesmael@yahoo.com
10.21608/ejchem.2018.4885.1435
GLYCIDYL methacrylate (GMA) polymerization with waste cotton fabric by utilizing a co-initiator of ferrous cellulose thiocarbonate–hydrogen peroxide redox system was first studied under various conditions. These include the polymerization time, temperature, liquor ratio, pH and concentrations of the initiator and monomer. The product cellulose-poly(glycidyl methacrylate) graft copolymer (CPGMA) produced at best polymerization conditions was then functionalized with triethylammonium chloride (TEAC), aiming to obtain a low-cost adsorbent for dye removal from wastewater. Also, factors that affecting the amination reaction, which include; reaction time, temperature, liquor ratio, pH, and aminating agent/epoxy molar ratio were studied. The prepared amino-functionalized cellulose-poly(glycidyl methacrylate) graft copolymer (AM-CPGMA) was further characterized by the FT-IR, thermal gravimetric analysis (TGA) and surface area measurement based on Brunauer–Emmett–Teller (BET) and Barrett-Joyner-Halenda (BJH) theories. The dye adsorption capacity of the anion exchanger was also evaluated.
Cotton fibers,glycidyl methacrylate,graft copolymerization,aminization
https://ejchem.journals.ekb.eg/article_16188.html
https://ejchem.journals.ekb.eg/article_16188_5ef342f70bc7361816209c6407bf10dd.pdf
National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT
Egyptian Journal of Chemistry
0449-2285
2357-0245
62
3
2019
03
01
Preparation and Evaluation of Xylose Palmitate Ester Using Candida antarctica Lipase B as A Reusable Biocatalyst
469
474
EN
Fatma
Loulou
LOMPOP. Department of chemistry.
loulouf@yahoo.fr
Nacer
Rezgui
LOMOP. Department of chemistry.
rezguint@yahoo.fr
Bidjou-Haiour
Chahra
Chemistry. UBMA. Bp 12 el hadjar. 23000 annaba
bidjouch@yahoo.fr
10.21608/ejchem.2018.5160.1458
The activity and stability of lipase B from Candida antarctica were investigated in direct enzymatic esterification of D-xylose with palmitic acid using ethylmethylketone as reaction media. The xylose palmitate was obtained under the optimized conditions, 1:1 molar ratio of xylose:palmitic acid, at 250 rpm and 60°C. Effect of the use of Butanol to wash the immobilized lipase before the enzyme reuse was evaluated. The lipase could be successfully reused four times without loss of activity. Various physicochemical characteristics of 1-O-hexadecanoyl-D- xylopyranose were also studied.
Xylose,Lipase,reuse,activity,Surface active properties
https://ejchem.journals.ekb.eg/article_19204.html
https://ejchem.journals.ekb.eg/article_19204_4b4c68f3241c5ff88dd4dd476348083e.pdf
National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT
Egyptian Journal of Chemistry
0449-2285
2357-0245
62
3
2019
03
01
Modified Nanostructure MgO Superbasicity with CaO in Heterogeneous Transesterification of Sunflower Oil
475
485
EN
Maimoonah
Kh.
Qasim
Department of General Science, University of Mosul, Mosul, Iraq
maimoonah.qasim@uomosul.edu.iq
10.21608/ejchem.2018.4321.1386
Modified MgO superbasicity with CaO as nanostructure were prepared by hydration-dehydration method and used as heterogeneous catalyst for the synthesis of biodiesel (FAME) via the transesterification of sunflower oil with methanol. The synthesis of biodiesel was characterized by proton nuclear magnetic resonance (1H-NMR) and attenuated total reflectance (ATR). The catalyst was characterized by Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA-DTG) and nitrogen gas adsorption (NA). The basicity of the prepared catalyst samples was also studied by back titration method. The optimal produced biodiesel was 97% at 25% molar ratio which carried out at atmospheric pressure, reaction time of 3 h, a reaction temperature of 65°C, a catalyst amount of 5 wt% and methanol:oil molar ratio of 9:1. The percentage conversion of biodiesel was determined by 1H-NMR. The modified nanostructure MgO with CaO showed tremendous potential in large-scale biodiesel from sunflower oil.
transesterification,Biodiesel,sunflower oil,nanostructure heterogeneous catalyst,calcium oxide,magnesium oxide
https://ejchem.journals.ekb.eg/article_19578.html
https://ejchem.journals.ekb.eg/article_19578_f8309a32d9aef1dec9edc4bcd333f357.pdf
National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT
Egyptian Journal of Chemistry
0449-2285
2357-0245
62
3
2019
03
01
An Improved Sensitive and Selective Non-enzymatic Glucose Biosensor Based on PEG Assisted CuO Nanocomposites
487
500
EN
AbdulSalam
Mohamed Azharudeen
Department of Chemistry
C.P.A. College, Bodinayakanur,
Theni District,
TamilNadu.
azhar5406@gmail.com
Thevaraj
Suriyakala
Department of Chemistry
C.P.A. College, Bodinayakanur,
Theni District,
TamilNadu.
suryavasagar@gmail.com
Muthuramalingam
Rajarajan
Department of Chemistry,
Madurai Kamaraj University,
Madurai-625021.
TamilNadu,
India.
rajarajanchem1962@gmail.com
Ayyadurai
Suganthi
Mother Teresa Women&#039;s University,
Kodaikanal,
Dindugal District.
TamilNadu.
suganthiphd09@gmail.com
10.21608/ejchem.2018.5707.1489
Determination of glucose is of enormous importance in the fields of biological, environmental and clinical analyses. In recent years, polymer modified metal oxides arrived a great consideration in the detection of glucose. In this study, we have developed a sensitive and selective non-enzymatic glucose sensor by using CuO NMO encapsulation with PEG (poly ethyleneglycol) nanocomposites. The loading content of PEG was incorporated with CuO by weight percentage (wt = 2, 4 & 6%). The fabricated CuO/PEG nanocomposites was utilized as a glucose sensor, it exhibit the tremendous electrocatalytic performances on oxidation of glucose. The electrocatalytic activity enhances with increasing the loading of PEG content. The sensor shows a low detection limit of 0.25 µM with a sensitivity of 113.8 µA mM-1 cm-2, good selectivity and stability. The CuO/PEG nanocomposites are hopeful for the advancement of cost-effective non-enzymatic glucose biosensors.
CuO,Mesoporous,PEG,glucose,Biosensor
https://ejchem.journals.ekb.eg/article_19579.html
https://ejchem.journals.ekb.eg/article_19579_95f06d890db0cd25c68339220b998588.pdf
National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT
Egyptian Journal of Chemistry
0449-2285
2357-0245
62
3
2019
03
01
Electrochemical Impedance Spectroscopy (EIS) and Study of Iron Corrosion Inhibition by Turmeric Roots Extract (TRE) in Hydrochloric Acid Solution
501
512
EN
Kholod
Almzarzie
Department of Chemistry, Faculty of Science, Damascus University, Syria.
kholod.m990@gmail.com
Ahmad
Falah
Department of Chemistry, Faculty of Science, Damascus University, Syria.
prof_ahmad_falah@hotmail.com
Ayman
Massri
Department of Chemistry, Faculty of Science, Damascus University, Syria.
aymanmasrri@gmail.com
Hassan
Kellawi
Department of Chemistry, Faculty of Science, Damascus University, Syria.
h.kellawi@hotmail.com
10.21608/ejchem.2018.5295.1476
TURMERIC Root extract (TRE) was tested as corrosion inhibitor for iron in 0.5 M HCl, using potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). Scanning electron microscope (SEM), and energy dispersive X-rays (EDX) analysis. The inhibition efficiency raised as in time of immersion rises, but decreases with temperature rise. The Nyquist plots showed that, the charge transfer resistance (Rct) increase, and the double layer capacitance (Cdl) decreases with time of immersion increase. Tafel results exhibit that both corrosion current and with corrosion speed are reduced with time of immersion. All impedance spectra of EIS tests exhibit one capacitive loop which indicates that the corrosion reaction is controlled by charge transfer process. IE (%) increases with the concentration of the inhibitor reaching its maximum value, 88. 90%, at 8g/100ml. Thermodynamics parameters: Ea, ΔH*, ΔS* were estimated, and mechanism of corrosion and inhibition was discussed. The adsorption of (TRE) followed Langmuir adsorption isotherm.
Key words: Iron,Electrochemical Impedance Spectroscopy (EIS),Turmeric Root extract (TRE),double layer capacitance (Cdl),Scanning Electron Microscope (SEM)
https://ejchem.journals.ekb.eg/article_20330.html
https://ejchem.journals.ekb.eg/article_20330_bfb8b675efe4fd11ae93866ce117fc16.pdf
National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT
Egyptian Journal of Chemistry
0449-2285
2357-0245
62
3
2019
03
01
New Adsorbent from Red Beet Roots (CRBR) for Removal of Lead
513
524
EN
Y. Walid
Al-Bizreh
professor in Department of Chemistry, Faculty of Sciences, Damascus University, Syria
ywbizreh2@icloud.com
Emtisal
Hamada
Chemistry, science, Damascus, Syria, Damascus
emtessal-hamada@hotmail.com
Malak
AL-Joubbeh
professor in Department of Chemistry, Faculty of Sciences, Damascus University, Syria
dr_malak.joubbeh@yahoo.com
10.21608/ejchem.2018.3904.1342
THE MAIN purpose of this work is to remove lead ions from aqueous solution by using carbon of red beet roots (CRBR). The influence of contact time, initial concentration, temperature, pH of solution and the dose of adsorbent were studied. It was found that the maximum removal percentage of Pb(II) has reached 99.99% at room temperature by applying the following conditions: adsorbent loading weight 0.1 g, contact time 24 hrs, and 9.993 m.mol/L concentration of lead ions. The adsorption process of Pb(II) on CRBR was of chemical nature and followed the kinetic formula of pseudo second –order reaction. Results of FTIR spectroscopy and scanning electron microscopy made it possible to propose mechanism for the adsorption process. The recovery of the adsorbed Pb(II) ions on CRBR surface was done by using 1 N acetic acid solution resulting a recovery of 87.466%.
red beet roots,Removal of lead,Adsorption
https://ejchem.journals.ekb.eg/article_16237.html
https://ejchem.journals.ekb.eg/article_16237_bf6e1d65d15a772c5a82cec0d738abe6.pdf
National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT
Egyptian Journal of Chemistry
0449-2285
2357-0245
62
3
2019
03
01
Crystallographic and Magnetic Properties of Al3+co-doped NiZnFe2O4 Nano-particles Prepared by Sol-gel Process
525
532
EN
Amany M.
El Nahrawy
0000-0002-3501-2541
Solid State Physics Department, Physics Research Division, National Research Centre (NRC)-33 ElBohouth st, P.O.12622, Dokki, Giza, Egypt.(Affiliation ID:60014618)
amany_physics_1980@yahoo.com
Heba
Salah El-Deen
Department of physics and chemistry, Faculty of Women for Arts, Science and Education, Ain Shams University.
Aisha A.
Soliman
Department of Solid State Physics, Faculty of Women for Arts, Science and Education, Ain Shams University.
Wafaa M.M.
Mosa
Department of spectrum Physics, Faculty of Women for Arts, Science and Education, Ain Shams University.
10.21608/ejchem.2018.4504.1397
Al2O3 SUBSTITUTED nickel zinc nano-ferrite Alx Ni0.5-x Zn0.5 Fe2O4 (x = 0.0, 0.1, 0.2, 0.3) was prepared by the citrate sol-gel methodusing nickel, zinc, iron and aluminum nitratesand sintered at 800oC for 3 h in air. Prepared nano-sized ferrites were characterized by X-ray diffraction, High resolution transmission and scanning electron microscopy and Fourier transforms infrared spectroscopy. The estimated crystallite sizes were in the range of 24.7–32.9 nm. HR-TEM data appears that all nano-ferrite samples are composed of more or less agglomerated nanoparticles with the average particle size of nanocrystallites is ~31 nm. The impact of introducing Al ions by Ni on themagnetic properties of the prepared nano-ferrite was investigated utilizing magnetic measurements at room temperature. The changing of crystallite sizes, lattice parameter and the surface area with increasing the Al content were determined.The saturation magnetization (Ms) and coercivity (Hc) values vary from 47.894-32.314 and 70.37-60.117 G; respectively.
Nano-crystalline ferrites,Nickel zinc ferrite,Sol-gel process,Spinel ferrite,Magnetic properties
https://ejchem.journals.ekb.eg/article_16875.html
https://ejchem.journals.ekb.eg/article_16875_067e8c5aa694b175c7365888a56543dc.pdf
National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT
Egyptian Journal of Chemistry
0449-2285
2357-0245
62
3
2019
03
01
Yield and chemical composition of essential oil of Achillea millefolium L. as affected by harvest time
533
540
EN
Eman
E.
Aziz
0000-0002-2724-1651
Medicinal and Aromatic Plants Research Department, National Research Center
eman_azer@yahoo.com
Elsaady
M.
Badawy
Department of Ornamental Horticulture, Faculty of Agriculture, Cairo University, Giza, Egypt
saady.badawy@ymail.com
Valtcho
D.
Zheljazkov
Oregon State University, Department of Crop and Soil Science, Corvallis, U.S.A.
valtcho.jeliazkov@oregonstate.edu
Saad
M.
Nicola
Department of Ornamental Horticulture, Faculty of Agriculture, Cairo University, Giza, Egypt
smnicola@yahoo.com
Hend
Fouad
0000-0002-0496-7935
Medicinal and Aromatic Plants Research Department, National Research Centre, Egypt
hendfouad12@yahoo.com
10.21608/ejchem.2018.5129.1454
Achillea millefolium is an important medicinal and aromatic plant and is grown commercially for production of essential oil in many countries including Egypt. The plant extract and essential oil possess antioxidant, antimicrobial, antispasmodic and antitumor properties. We hypothesized that the essential oil content and composition may be influenced by harvest time and environmental conditions. Thus, flowering heads yield and the essential oil content and quantitative composition were investigated during different harvest times in the Experimental Station of National Research Centre at Nubaria, Beheira Governorate, West of Nile Delta, Egypt under drip irrigation. Flowering heads yield and essential oil composition varied according to harvest time. The highest essential oil yield was observed at the second harvest on10 April and 5 May of the first and second seasons, respectively. The essential oils at the different harvest times were characterized by containing monoterpenes with high amounts of β-pinene (24.1–54.6%) and sabinene (3.1–7.4%). The most abundant sesquiterpenes were chamazulene (10.1–26.7%) followed by geramacrene-D (1.3–10.3%) and β-caryophyllene (0.9–6.4%). Plants harvested on 21 February provided essential oil with relatively high concentration of chamazulene and germacrene-D. Chamazulene and germacrene-D decreased gradually at the later harvests, while β-pinene and limonene reached the maximum concentration in plants harvested on15 May. These results indicate that flowering heads yield and essential oil content and composition can be influenced by harvest time and climatic conditions which can be useful to producers and processors of Achillea millefolium.
essential oil,Achillea millefolium,harvest time,sandy soil
https://ejchem.journals.ekb.eg/article_16877.html
https://ejchem.journals.ekb.eg/article_16877_6956c97400048e0e497fc5db70e80e75.pdf
National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT
Egyptian Journal of Chemistry
0449-2285
2357-0245
62
3
2019
03
01
Methylene Blue and Crystal Violet Dyes Removal (As A Binary System) from Aqueous Solution Using Local Soil Clay: Kinetics Study and Equilibrium Isotherms
541
554
EN
Ahmed
Ibrahim
Composite and Nanomaterials Department, Advanced Technology and New Materials Research Institute, City for Scientific Research and Technology Applications, P. O. Box 21934, SRTA, Egypt
ahm_ch_ibr@yahoo.com
Gomaa
Farouk
El Fawal
Polymeric Materials Research Department, Advanced Technologies and New Materials Research Institute (ATNMRI), Scientific Research and Technological Applications City (SRTA-City), New Borg El-Arab City, 21934, Alexandria, Egypt.
gelfawal@gmail.com
Magda
A.
Akl
Chemistry department, Faculty of Science, Mansoura University, Mansoura, Egypt
magdaakl1@yahoo.com
10.21608/ejchem.2018.4113.1360
IN THIS PAPER, local soil clay as a low cost and affordable adsorbent was employed for the successful removal of methylene blue (MB) and crystal violet (CV) dyes from an aqueous binary system. The effect of various experimental conditions like adsorbate concentrations, time, temperature, and pH has been investigated. To know the adsorption performance of the dye molecules upon soil clay, the kinetics of the adsorption data were analyzed using various models such as pseudo-first-order and pseudo-second-order. This kind of study shows that the maximum adsorption reached at 2 min and uses the pseudo- second-order kinetics. The adsorption Kinetics have been investigated in the pH range of 2, 3.7, 7, and 8.7 at 25˚C and analyzed with two different models namely Langmuir and Freundlich. The interaction of dye molecules with soil clay has been investigated by SEM, EDS, FTIR, and XRD. Maximum removal of MB and CV up to 47.82 and 35.71 mg g-1, respectively was achieved by dye molecules adsorption onto soil clay. This effective removal method may provide a promising solution for eliminating of CV and MB dyes from wastewater.
Soil,methylene blue,Crystal Violet,Binary system,dye removal,Wastewater
https://ejchem.journals.ekb.eg/article_16873.html
https://ejchem.journals.ekb.eg/article_16873_cd108e9c997986dd531e62024dfd9590.pdf
National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT
Egyptian Journal of Chemistry
0449-2285
2357-0245
62
3
2019
03
01
Enhancement of Recycled WPC with Epoxy Nanocomposite Coats
555
563
EN
Huda
Alnajjar
0001-5799-8631
Department of Chemistry-Faculty of Science, Al-Azhar University (Girls Branch), Nasr City, Cairo, Egypt.
hoda_elnagar1@yahoo.com
N.
Shaker
Department of Chemistry-Faculty of Science, Al-Azhar University (Girls Branch), Nasr City, Cairo, Egypt.
nihal_shaker@hotmail.com
Hamdy
Naguib
0000-0001-7741-0305
Polymer Nanocomposite Center (PNC), Egyptian Petroleum Research Institute (EPRI), Nasr City 11727, Cairo, Egypt
hamdynaguib@yahoo.com
Usama
F.
Kandil
0000-0002-2918-8444
Polymer Nanocomposite Center (PNC), Egyptian Petroleum Research Institute (EPRI), Nasr City 11727, Cairo, Egypt.
alfa_olefins@yahoo.com
H.
Ahmed
Department of Chemistry-Faculty of Science, Al-Azhar University (Girls Branch), Nasr City, Cairo, Egypt.
ha_ahmed@azhar.edu.eg
Awatef
A.
Farag
Department of Chemistry-Faculty of Science, Al-Azhar University (Girls Branch), Nasr City, Cairo, Egypt.
awatif_farag@yahoo.com
10.21608/ejchem.2018.4684.1415
THE RECYCLED plastic and wood waste were recycled to produce new useful product, wood plastic composite (WPC), that having characteristics close to commercial wood. WPC was performed by compounding and forming different recycled polyethylene/wood flour (PE/WF) weight ratios as 70/30, 60/40, 50/50 and 40/60 using twin screw extruder. Based on the mechanical properties measured via dynamic mechanical analysis (DMA), an optimized ratio was found to be (50/50)and was chemically treated with chromic acid solution and investigated by FTIR that approved successful functionalization after treatment. The treated WPC was then coated with different epoxy nanocomposites including reactive rubber nanoparticles (RRNP), montmorillonite nanoclay (MMT) and carbon nanotubes (CNTs). The coated WPC was fully tested using mechanical characterizations (modulus and scratch), water absorption (dist. and sea water), and thermal gravimetric analysis (TGA). The results showed that WPC coated with epoxy/CNT, epoxy/MMT and epoxy/RRNP has an enhanced final product with promising mechanical and physical properties compared to blank or uncoated WPC specimens. Also WPC coated with all epoxy nanocomposites has got enhanced modulus, more scratch resistance, lower water absorption and developed thermal stability, compared to the un-filled epoxy coat. Of those, the epoxy-CNT nanocomposite is an optimized protective coat for WPC even after immersion in water with different conditions.
coating,Nanocomposites,WPC,Modulus
https://ejchem.journals.ekb.eg/article_17675.html
https://ejchem.journals.ekb.eg/article_17675_5149ed80ae7b3ca7872caa655f6a50ef.pdf