ORIGINAL_ARTICLE
Eco-friendly Mimosa Tannin Adhesive System for Bagasse Particleboard Fabrication
The main goal of this paper was to replace most paraformaldehyde (PF) by mimosa tannin based resins as a binding agent in particleboard manufacture. Physical and mechanical properties of the fabricated particleboards were studied to evaluate their quality. The physical properties involved thickness swelling and water absorption, whereas the mechanical properties involved internal bond strength, modulus of elasticity and modulus of rupture. The impacts of bagasse mesh size and polymethyl methacrylate (PMMA) as a coating material were also investigated. Particleboard resulted from mimosa tannin coated with PMMA had superior properties than the particleboard prepared from uncoated particles. The particleboard prepared from bagasse through mesh size 4 had much better qualities than the particleboard prepared from bagasse through mesh size 3 for all physical and mechanical properties at all tannin resin ratio content studied. The results also confirmed that, mimosa tannin could be used up to 12.5% resin without deteriorating the physical and mechanical properties of boards. In general, mimosa tannin–PF resin can be effectively used as adhesives for particleboard with reducing about 63% of PF consumption.
https://ejchem.journals.ekb.eg/article_22493_958a0ae3b85d3859948b9dca8c628ca5.pdf
2019-05-01
777
787
10.21608/ejchem.2018.5413.1479
Keywords: mimosa tannin
paraformaldehyde
Adhesive
bagasse
particleboard
Characterization
Essam
Abd El-Sayed
essamksu@yahoo.com
1
Cellulose and Paper Department, National Research Centre,33 El-Bohouth St.(Former EL Tahrir St,), Dokki, P.O.12622, Giza, Egypt
LEAD_AUTHOR
Mohamed
El-Sakhawy
elsakhawym@gmail.com
2
Cellulose and Paper Department, National Research Centre,33 El-Bohouth St.(Former EL Tahrir St,), Dokki, P.O.12622, Giza, Egypt
AUTHOR
Samir
Kamel
samirki@yafoo.com
3
Cellulose and Paper Department, National Research Centre,33 El-Bohouth St.(Former EL Tahrir St,), Dokki, P.O.12622, Giza, Egypt
AUTHOR
Ahmed
El-Gendy
ahmedalielgendy123@gmail.com
4
Cellulose and Paper Department, National Research Centre,33 El-Bohouth St.(Former EL Tahrir St,), Dokki, P.O.12622, Giza, Egypt
AUTHOR
Ragab
Abouzeid
r_abouzeid2002@yahoo.com
5
Cellulose and Paper Department, National Research Centre,33 El-Bohouth St.(Former EL Tahrir St,), Dokki, P.O.12622, Giza, Egypt
AUTHOR
ORIGINAL_ARTICLE
Fe3O4 Nanoparticles: Synthesis, Characterization and Application in Removal of Iron from Aqueous Solution and Groundwater A.A.
Magnetic iron oxide nanoparticles were synthesized by co-precipitation method and characterized by using Fourier transform infrared spectroscopy (FT-IR), X-ray diffractometer (XRD), and scanning electron microscopy (SEM). Adsorption properties of the synthesized magnetic iron oxide nanoparticles towards iron ions were systematically investigated, including pH effect, adsorbent dosage, initial concentration, temperature, adsorption equilibrium and adsorption kinetics. The adsorption kinetics was studied by the pseudo first-order and pseudo second-order models. The adsorption isotherm for the removed iron ions were described by the Langmuir, Freundlich, D-R and Temkin isotherm models. The obtained results reveled that, the maximum adsorption capacity for Fe ions was 28.2mg/g and the removal percentage reached nearly 85% at adsorbent dosage 0.22g, temp. 600C, time 210min., pH 4 and initial concentration 117.3mg/L. The adsorption capacity was increased with the increase of temperature and decrease of adsorbent dosage. The reaction obeyed both the pseudo second-order model and Langmuir isotherm model (with correlating constant R2 is 0.98) . Also, the calculated mean free energy of the sorption from the Dubinin–Radushkevich isotherm was found to be 207.7KJ/Mol for iron ions, indicating a chemical sorption. With high regression coefficients for Fe ions at 302K, and thermodynamic calculations suggested that the adsorption of iron ions onto the magnetic iron oxide nanoparticles is an endothermic process.
https://ejchem.journals.ekb.eg/article_23892_e9e1c282ef0b36a3574422ae473602ab.pdf
2019-05-01
789
709
10.21608/ejchem.2019.5527.1488
Magnetic iron oxide nanoparticles
Heavy metals ions
adsorption isotherms
Kinetics
Thermodynamics
Abd El-Samih
Swelam
abdelsamihswelam@yhoo.com
1
Professor of Physical Chemistry, Chemistry Department, Faculty of Science, Al-Azhar University
AUTHOR
Magdy
Awad
drmagdybahy_2008@yahoo.com
2
Professor of Physical Chemistry, Chemistry Department, Faculty of Science, Al-Azhar University
AUTHOR
yahia
Gedamy
yahiagedamy2014@yahoo.com
3
hydrogeochemistry department desert research center
AUTHOR
Ahmed
Bedair
ahmed_bedair30@hotmail.com
4
Physical Chemistry Department, Faculty of Science, Al - Azhar University, Nasr City, Egypt.
LEAD_AUTHOR
ORIGINAL_ARTICLE
Mitigation of Hydrogen Evolution during Zinc Corrosion in Aqueous Acidic Media Using 5-Amino-4-imidazolecarboxamide
The rate of H2 production was investigated during the dissolution of Zn in 0.5 M HCl in the absence and presence different concentrations of 5-amino-4-imidazole carboxamide (AIC). Different techniques such as gasometry, potentiodynamic, impedance and scanning electron microscope were used. The data indicated that the rate of hydrogen evolution was increased with the inundation time and temperature and was mitigated by AIC inhibitor. The potentiodynamic polarization and electrochemical impedance spectroscopy showed that AIC introduces an inhibitive film that can control the corrosion of zinc and the production of H2. Polarization data proved that AIC inhibitor acted as a surface-active molecule that behaves as a mixed-type inhibitor. The free energy of adsorption and adsorption-desorption equilibrium constant were deduced and discussed.
https://ejchem.journals.ekb.eg/article_22494_526e7f1e7576d078124ff6010f20484f.pdf
2019-05-01
811
825
10.21608/ejchem.2018.6006.1507
imidazole
zinc
Corrosion inhibition
Hydrogen production
Potentiodynamic
impedance
S
El Wanees
s_wanees@yahoo.com
1
Zagazig University, Chemistry Department,
Faculty of Science, Egypt
LEAD_AUTHOR
M
Alahmdi
m_alahmdi@ut.edu.sa
2
Tabuk Uinversity, Faculty of Science, Chemistry Departement
AUTHOR
M
Alsharif
me_alsharif@ut.edu.sa
3
Tabuk University, Faculty of Science
AUTHOR
Y
Atef
yasmin.atef7@yahoo.com
4
Chemistry Administration, Cairo, Egypt
AUTHOR
ORIGINAL_ARTICLE
Beta-cyclodextrin Grafted with Poly (ε-caprolactone) for Ibuprofen Delivery System
The aim of this study is to synthesize a polymeric composite based on grafted beta-cyclodextrin (β-CD) with poly (ε-caprolactone) using ring-opening polymerization (ROP) technique, in presence of ethylene glycol dimethacrylate (EGDMA) and benzoyl peroxide (BP) as crosslinker and initiator, respectively, for drug delivery system (ß-CD-PCL). The obtained ß-CD-PCL composites were characterized by nuclear magnetic resonance (1HNMR), Fourier transform infrared spectroscopy (FT-IR) and transmission electron microscope (TEM). Ibuprofen (IBU) was used as anti-inflammatory drug model. IBU was loaded onto the resulting materials during the preparation process at different drug concentrations (400, 516, 600, 700 and 1000) mg/L. On the other hand, the kinetics study of the copolymerization was carried out in terms of grafting yields (GY%), grafting efficiency (GE%), and monomer conversion (%). Moreover, in vitro IBU release study was investigated in phosphate buffer of pH 7.4 at 37°C. The results indicated that the prepared composites based on grafted β-CD with PCL could be used as a potential hydrophobic drug delivery carrier with sustained release property. Besides, due to the sustained release of IBU from the cavity of the β-CD, it was possible to maintain a constant desired IBU concentration over a period of 24 h, as confirmed by the release steady.
https://ejchem.journals.ekb.eg/article_21201_f7738c204ab6c2d2f8aba42636cf2ffe.pdf
2019-05-01
827
835
10.21608/ejchem.2018.5125.1455
β-cyclodextrin
ε-caprolactone
Ibuprofen
ring-opening polymerization
in vitro drug release
Ahmed
Haroun
haroun68_2000@yahoo.com
1
National research centre
LEAD_AUTHOR
Ali
Osman
ali.osman@yahoo.com
2
Department of organic chemistry, Faculty of science, Beni-suef University, 62514, Egypt.
AUTHOR
Sayed
Ahmed
sayed.ahmed@gmail.com
3
Department of organic chemistry, Faculty of science, Beni-suef University, 62514, Egypt.
AUTHOR
Ahmed
Elghandour
ahmedelghandour@yahoo.cm
4
Department of organic chemistry, Faculty of science, Beni-suef University, 62514, Egypt.
AUTHOR
ORIGINAL_ARTICLE
A Novel Microwave Synthesis of Manganese Based MOF for Adsorptive of Cd(II), Pb(II) and Hg(II) Ions from Aqua Medium
The manganese based MOF (Mn(BDC)(H2O)2); was successfully synthesized via a microwave method. The features of the Mn-MOF was evaluated by XRD, TGA, N2 adsorption-desorption at -196ºC, FTIR and SEM. The elimination of heavy metal ions from aqueous solution via Mn-MOF was described by batch adsorption tests including kinetic and thermodynamic models. Mn-MOF exhibited a very high adsorption efficiency towards Cd(II), Pb(II) and Hg(II) from aqueous solution (81.89%, 71.19% and 65.19% respectively). Adsorption kinetics data evidenced that heavy metal ions adsorption isotherms appropriated the Langmuir model and conform the pseudo-second-order kinetic equation. Successfully, the Mn-MOF was reused illustrative in the first run, the adsorbed amounts for (Cd(II), pb(II) and Hg(II)) were (80.2%, 69.6% and 64%) after fifth run became (68%, 54.74% and 50.98% respectively) which is elucidating its potential for heavy metal ions decontamination application.
https://ejchem.journals.ekb.eg/article_23374_2220d150fb9291a8e5a0c5b08cc25e92.pdf
2019-05-01
837
851
10.21608/ejchem.2019.6524.1550
Manganese-MOF
Cd(II)
pb(II)
Hg(II)
Adsorption
interaction mechanism
Howaida
Abd El Salam
howaida.abdelsalam@gmail.com
1
Egyptian Petroleum Research Institute
LEAD_AUTHOR
Tamer
Sharara
tamerzakisharara@yahoo.com
2
Egyptian Petroleum Research Institute
AUTHOR
ORIGINAL_ARTICLE
Microwave Assisted Synthesis of Some Azo Disperse Dyes withAntibacterial Activities. Part 1
This study aimed to synthesis a series of disperse dyes based on pyrazolopyrimidinones. Enaminones were used to prepare these dyes by reaction in acidic condition by using microwave irradiations. Their structures were established by using Elemental analysis, FTIR, Mass, UV and NMR spectroscopy. The antibacterial activities of these disperse dyes were also evaluated
https://ejchem.journals.ekb.eg/article_22428_ea291e06dfdd747ec0560333fd1d68a2.pdf
2019-05-01
853
859
10.21608/ejchem.2018.6547.1552
Disperse dyes
Microwave irradiation
Antibacterial
Morsy
Elapasery
elapaserym@yahoo.com
1
Dyeing, Printing and Auxiliaries Department, Textile Research Division, National Research Centre, Cairo 12622, Egypt
LEAD_AUTHOR
Abdelhaleem
Hussein
abdelhaleemmh@yahoo.com
2
Department of Chemistry, Faculty of Science, Al Azhar University, Assiut 71524, Egypt
AUTHOR
Abubaker
Eladasy
a_eladasy@yahoo.com
3
Department of Chemistry, Faculty of Science, Al-Azhar University, Assiut, Egypt
AUTHOR
Mohamed
Saleh
mos_200@yahoo.com
4
Department of Chemistry, Faculty of Science, Al-Azhar University, Assiut, Egypt
AUTHOR
Magda
Kamel
drmagda11@yahoo.com
5
National Research Centre
AUTHOR
ORIGINAL_ARTICLE
Antibacterial Treatment of Cotton Fabrics using Methylisothiazolinone
The prevailing study is an attempt to utilize Methylisothiazolinone (MIT) which was applied efficiently in other applications away from fabric finishing fields such as preservation and health care. A certain concentration of the substance were applied to the scoured woven cotton fabric , the use of distinct methods of treatment which includes Exhaustion and pad-dry-Thermo-fixation. The results obtained showed that using pad-dry-Thermo-fixation gave better nitrogen content more than exhaustion method, subsequently we continued the work using padding method which gave more anti-bacterial conduct . Furthermore, by varying the different factors influencing the reaction such as MIT's concentration (10-50 mg/l or ppm), curing time (1-10 min.) and curing temperature (120-170°C) the study reached the optimum conditions to get the best anti-bacterial treatment for cotton fabrics against gram positive bacteria(Staphylococcus Auras) and gram negative bacteria ( Escherichia Coli) . FT-IR spectroscopy, Antibacterial test according to (AATCC) and SEM were used to assure the obtained results.
https://ejchem.journals.ekb.eg/article_22961_a5a63f7e9275acc9c82ace5091d0dd4d.pdf
2019-05-01
861
867
10.21608/ejchem.2018.6447.1544
Antibacterial activity
Cotton
finishing and Methylisothiazolinone
Mohamed
Shaaban
drmohamed727@gmail.com
1
33 Behouth street-Dokki-Giza-Egypt
LEAD_AUTHOR
Ahmed
Montaser
abohabbiba2012@gmail.com
2
33 El-behooth street. dokki. gize. egypt
AUTHOR
ORIGINAL_ARTICLE
Influence of Blend Ratio on The Electrical Characteristics of Vulcanized SBR/NBR Blends Compatibilized by Cis-polybutadiene Rubber
Blends composed of styrene butadiene rubber (SBR) and acrylonitrile-butadiene rubber (NBR) have been fabricated by melt-blending technique using two-roll mill blend machine. Cis-polybutadiene rubber (CBR) was used as a compatibilizer for enhancing the homogeneity between blend phases. No previous reports were found to discuss improving electrical properties of vulcanized SBR/NBR blends using unfilled rubber system (i.e. no fillers incorporation). SEM micrographs were utilized to verify the compatibility between two rubber ingredients in various blends, owing to the use of compatibilizer. Thermal stability of blends was investigated by differential thermal analysis (DTA) and differential scanning calorimetric (DSC) to evaluate the influence of blend ratio on the compatibility of investigated samples. Results revealed that the dielectric properties of blends are dramatically influenced by altering the blend ratio. The results revealed that the SEM observations confirmed the compatibilization effect of CBR on vulcanized SBR/NBR blends. Meanwhile, thermal properties of vulcanized SBR/NBR blends were enhanced with increasing of SBR contents in blends. The complex impedance graphs showed circular arcs showing the bulk contribution to overall electrical behavior for investigated vulcanized SBR/NBR blends. During I-V characteristics have been presented, where a remarkably change from linear behavior to nonlinear conduction at lower temperatures was found for 0SBR/100NBR blends. These findings supported and confirmed that the compatibilization effect and the blend ratio between rubber compositions have strongly influenced on their thermal and electrical properties of vulcanized blends.
https://ejchem.journals.ekb.eg/article_21202_32085561d4c7c6933c78548547bfb1fc.pdf
2019-05-01
869
883
10.21608/ejchem.2018.5763.1495
SBR/NBR blends, CBR Compatibilizer, Thermal properties
Impedance spectroscopy
Electrical characteristics
Elbadawy
Kamoun
badawykamoun@yahoo.com
1
Polymeric Materials Research Dept., Advanced Technology and New Materials Research Institute (ATNMRI), City for Scientific Research and Technological Applications (SRTA-City), New Borg Al-Arab City, 21934 Alexandria, Egypt
AUTHOR
Ahmed
Doma
ahmed_egypt25@yahoo.com
2
Polymeric Materials Research Dept., Advanced Technology and New Materials Research Institute (ATNMRI), City for Scientific Research and Technological Applications (SRTA-City), New Borg Al-Arab City, 21934 Alexandria, Egypt
LEAD_AUTHOR
Sayed
Abboudy
sayedabboudy@yahoo.com
3
Physics Dept., Faculty of Science, Alexandria University, Alexandria, Egypt
AUTHOR
Sherine
Khattab
sh.n.khattab@gmail.com
4
Chemistry Dept., Faculty of Science, Alexandria University, 426-Ibrahimia, Alexandria 21321, Egypt
AUTHOR
Ali
El-Bardan
alyelbardan@yahoo.com
5
Chemistry Dept., Faculty of Science, Alexandria University, 426-Ibrahimia, Alexandria 21321, Egypt
AUTHOR
Mohamed
Belal
ahmedcr7italy@gmail.com
6
Chemistry Dept., Faculty of Science, Alexandria University, 426-Ibrahimia, Alexandria 21321, Egypt
AUTHOR
ORIGINAL_ARTICLE
Preparation and Evaluation of Paint One and Two Shells Micro-capsules
There are two basic forms of micro-capsules, 1st form is covered by one shell made of urea-formaldehyde, while the 2nd one is covered by two shells (first one is urea-formaldehyde and the second one made of poly-urethane). Both forms are filled with two types of corrosion inhibitor (corr A and the other is corr B). Many tests are performed; Optical microscope scanning was applied to the micro-capsules in order to confirm the formation of capsules. Micro-capsules were weighed in order to measure the shrinking rate under heating of the micro-capsules. Infra-red spectroscopy was applied to make sure of the formation of shells of the micro-capsules. Physical properties were monitored weekly to confirm the stability of the micro-capsules. The purpose of preparing theses micro-capsules is to install a system of self-healing paints for corrosion protection.
https://ejchem.journals.ekb.eg/article_22429_9fcf3d848be9ed4450c75b7628a53681.pdf
2019-05-01
885
896
10.21608/ejchem.2018.5286.1467
Micro-capsules – one shell – two shells – surfactant – shrinking time
Ahmed
Ramadan
mado10fos@yahoo.com
1
Helwan university-faculty of science
AUTHOR
Ahmed
Amer
mado_10fos_977@hotmail.com
2
Ministry of military production
LEAD_AUTHOR
Abdel aziz
Gomaa
agomaa11@yahoo.com
3
Pacchin company- former head of quality sector
AUTHOR
ORIGINAL_ARTICLE
Preparation and Evaluation of Coating Have One and Two Shells (Part 2)
Micro-capsules are prepared with two basic forms, the 1st form is covered by one shell made of urea-formaldehyde, the 2nd one is covered by two shells (the first shell is urea-formaldehyde and the second shell made of poly-urethane). Both the first and the second forms of the Micro-capsules are filled by two types which are corrosion inhibitors (corr A and corr B). Some tests were applied and discussed like: optical scanning microscope was used to confirm the formation of capsules, microcapsules were weighed in order to measure the shrinking rate, thermal gravimetric analysis was applied to find the rate of stability under heating of the micro-capsules; Infra-red spectroscopy was applied to make sure of the formation of shells of the micro-capsules and physical properties were monitored weekly to confirm the stability of the micro-capsules (these tests were applied and discussed in paper part 1 which sent under the number : 1809-1467). In this paper the self-healing properties are focused on as: micro-capsules of the one and two shells were incorporated with epoxy paint (which used as a protective coating for severe environmental conditions). Micro-capsules showed promising corrosion protection via performing self-healing properties as it focused on adding different anti-corrosive materials into capsules of one and two shells which opens the door for new uses and additions. The research results would be important for self-healing and anti-corrosive materials industry.
https://ejchem.journals.ekb.eg/article_22430_4d71f0189d3547d6226d1f4b51dc648c.pdf
2019-05-01
897
911
10.21608/ejchem.2018.5289.1468
Micro-capsules – self-healing – one shell – two shells
Ahmed
Ramadan
mado10fos@yahoo.com
1
Helwan university-faculty of science
AUTHOR
Ahmed
Amer
mado_10fos_977@hotmail.com
2
Helwan University- faculty of science
LEAD_AUTHOR
Abdel aziz
Gomaa
agomaa11@yahoo.com
3
Pacchin company- former head of quality sector
AUTHOR
ORIGINAL_ARTICLE
Studying of Physico-Mechanical and Electrical Properties of Polypropylene/ Nano-Copper Composites for Industrial Applications
Polypropylene/ nano-copper composites have been prepared with 0.5, 1, 1.5 and 2.5 wt.% nano-copper particles by mixing the nano-copper physically with the polypropylene granules then extruded by a twin screw extruder. A comprehensive study on these composites was conducted by measuring the material relative permittivity, electrical conductivity, thermal properties and tensile strength. The results showed a significant enhancement of the composite behavior up to 1.5 wt.% nano-particles addition. The increase of the nanoparticles up to 1.5 wt.% Cu decreases the relative permittivity and slightly increases the electrical conductivity. Finally, the fabricated composites with different nano-copper contents have large findings within different applications especially in electronics, packaging, and environmental issues.
https://ejchem.journals.ekb.eg/article_22960_94e3ea9f74b9b9c3923c47f90b085b85.pdf
2019-05-01
913
920
10.21608/ejchem.2018.6278.1530
Nano-copper/polypropylene composite
Thermal properties
electrical conductivity
tensile strength
Lamiaa
Mohamed
lamiaa.zaky@cu.edu.eg
1
Mining, Petroleium, Metallurgical Engineering Dept., Faculty of Engineering, Cairo Univerrsity
LEAD_AUTHOR
Alaa I.
Eid
2
Composite Division, Advanced Materials Dept., Central Metallurgical Research and Development Institute (CMRDI), Helwan, Egypt.
AUTHOR
Omayma A.
El kady
3
Powder Technology Division, Central Metallurgical Research and Development Institute (CMRDI), Helwan, Egypt.
AUTHOR
Ashraf K.
Eessaa
4
Electronic Research Institute (ERI), Nanotechnology Lab. Dokki, Cairo, Egypt.
AUTHOR
Shaimaa A.
Esmail
5
Mechanical Design and Production Engineering Dept., Faculty of Engineering, Cairo University, Egypt.
AUTHOR
ORIGINAL_ARTICLE
Effect of Vinyltrimethoxysilane as a Coupling Agent on The Mechanical and Electrical Properties of Acrylic Rubber
When there is a need for enhancing the adhesion between a polymeric material and the filler, silane coupling agents are the best choice. In order to enhance the adhesion between acrylic rubber (ACM) and silica, vinyl trimethoxy silane (VTMS) can be used for this purpose. Acrylic rubber was prepared by emulsion polymerization. VTMS was added during the polymerization process to copolymerize with ACM. VTMS was added in different per cent; 0, 0.25, 0.5, 1.0 and 2.0 %. The effect of adding different percentages of VTMS on the mechanical, thermal and mechanical properties was monitored. Mechanical properties were significantly improved due to silane incorporation to the acrylic rubber matrix. The thermal stability of acrylic rubber increased due silane addition. Electrical measurements revealed that the volume resistivity, dielectric strength and breakdown voltage were also increased.
https://ejchem.journals.ekb.eg/article_23038_9271455f17caec110b54d886b120825c.pdf
2019-05-01
921
936
10.21608/ejchem.2018.1477.1098
Acrylic rubber
silane
rheometric characteristics
SEM
mechanical and
electrical properties
Basma
Saleh
basmasalehnis@yahoo.com
1
Polymer Department, National Institute for Standards, Giza.
LEAD_AUTHOR
Samir
Lawandy
prof_lawandy@yahoo.com
2
Polymer Metrology and Technology Department, National Institute for Standards, Giza, Egypt.
AUTHOR
Farag
AbdAlHai
faragabdalhai@yahoo.com
3
Chemistry Department, Faculty of Science, Al-Azhar University, Egypt.
AUTHOR
Ahmed
Abd el-Hakim
ahmednis83@gmail.com
4
Polymer Department, National Institute for Standards, Giza, Egypt.
AUTHOR
ORIGINAL_ARTICLE
Nano-chamomile Waste as a Low-cost Biosorbent for Rapid Removal of Heavy Metal Ions from Natural Water Samples
In this study, we report the feasibility of using nano chamomile waste (NCW) as a selective solid phase extractor for heavy metal ions. The experimental parameters including pH (1.0–6.0), metal ion concentration (10–100 mole), adsorbent dose (10–1000 mg), and biosorption time (0.5–90 min) were altered by using the batch technique to optimize the maximum capacity of this new biosorbent. The experimental data by NCW agreed with both Freundlich and Langmuir models (R2 =0.999) with maximum uptake capacities of 621.6 mgg–1 (3 mmolg–1) for Pb (II), 163.9 mgg–1 (2.58 mmolg–1) for Cu (II), and 522.7 mgg–1 (9.36 mmolg–1) for Fe (III). In addition, the values of metal uptake as a function of time agreed with the kinetic pseudo-second-order model. The kinetic experiments confirmed the fast accessibility of metal ions to the biosorbent surface resulting in equilibrium within 30 s. NCW was also characterized using FT-IR spectra and the crystallinity of the biosorbent was characterized using X-ray diffraction (XRD). The morphological characterization and particle size of NCW were obtained using SEM and TEM, respectively. Our method was investigated to measure Pb (II), Cu (II), and Fe (III) with a certain spiked amounts in natural water samples such as groundwater (GW), drinking tap water (DTW), natural drinking water (NDW), Nile River water (NRW), seawater (SW), and wastewater (WW). A removal efficiency of ≥98% was obtained for all collected samples using batch experiments and without matrix interferences. Considering its cheap source, simple, economic and fast uptake process, NCW can be used as a low-cost nano biosorbent for the removal of metal ions from natural water samples.
https://ejchem.journals.ekb.eg/article_23470_13460da63daeb50979519ca5cdee008c.pdf
2019-05-01
937
953
10.21608/ejchem.2019.5921.1504
Nano chamomile waste
Heavy metal removal
Natural water samples
adsorption isotherms
Kinetic studies
Biosorbance
Tamer
Hasanin
tamer.hasanin@mu.edu.eg
1
Chemistry department - faculty of science - Minia University
LEAD_AUTHOR
Salwa
Ahmed
salwa_kasem2003@yahoo.com
2
Chemistry Department, Faculty of Science, Minia University, El-Minia 61519, Egypt
AUTHOR
Taghreed
Barakat
taghred_b@yahoo.com
3
Chemistry Department, Faculty of Science, Minia University, El-Minia 61519, Egypt
AUTHOR
ORIGINAL_ARTICLE
Effect of The Precursors and Synthesis Methods on The Optical and Photo- electrochemical Characteristics of SnS Absorber Layer
Influence of the preparation method and different precursors are important for the absorber photovoltaic layer parameters of SnS. Synthesis of SnS compounds was carried out via two preparation methods; solid state reaction and hydrothermal; using different sulfur precursors. The morphology of particles and phase identification were studied using Field Emission Scanning Electron Microscope (FESEM) and X-ray diffraction (XRD) techniques. The XRD diffraction pattern of SnS revealed the existence of two crystal structure phases: the major is orthorhombic and the minor phase is tetragonal. The optical properties were determined using UV-Vis spectrophotometer showing absorbance peaks around 485 nm. The lowest bandgap of 1.74 eV is for SnS sample prepared from L-cystine. Electrochemical impedance spectroscopy (EIS) revealed that SnS cell prepared from L-cystine gave the lowest resistance of 171W. The photoelectrochemical measurements of this cell showed the highest power conversion efficiency per unit area of 2.5%.
https://ejchem.journals.ekb.eg/article_22959_f2c70f97d51505252be4a0aa54be64d8.pdf
2019-05-01
955
964
10.21608/ejchem.2018.5122.1486
SnS absorber layer
Electrochemical impedance spectroscopy
photoelectrochemical investigation
Atef
Shenouda
ayshenouda@gmail.com
1
Central Metallurgical Research and Development Institute
LEAD_AUTHOR
Mustafa
Sanad
mustafa_sanad2002@yahoo.com
2
Central Metallurgical Research and Development Institute
AUTHOR
Ofeliya
Kostadinova
ofeliya.kostadinova@iees.bas.bg
3
Institute of Electrochemistry and Energy Systems (IEES), Bulgarian Academy of Sciences, 10 Acad. G. Bonchev Bl. 10, 1113 Sofia, Bulgaria
AUTHOR
ORIGINAL_ARTICLE
Combined antimicrobial finishing & dyeing properties of cotton, polyester fabrics and their blends with acid and disperse dyes
This study demonstrates the possibility of enhancing the antibacterial activity and dyeing properties of cotton, polyester and their blended fabrics in one step. These fabrics were treated first with carboxymethyl chitosan (10 g/kg) to impart it antibacterial activity and enhance dye ability at the same time followed by dyeing with acid dyes and disperse dye. Results show an improvement in antibacterial activity and dye ability. It was further noted that, in all cases, the treated fabrics were more susceptible towards Gram positive bacteria (S. aureus) than Gram negative bacteria (E. coli) due to bacteria structure. The treated samples exhibited very sufficient antibacterial activity even after 25 washing cycles through durability test. Modes of interactions were proposed, and surface modification was also confirmed by FT-IR, TGA and SEM analysis.
https://ejchem.journals.ekb.eg/article_21204_c2ab18820ab9ac9d2938996347dfe0d6.pdf
2019-05-01
965
976
10.21608/ejchem.2018.6358.1535
Carboxymethyl chitosan antimicrobial finishing
dyeing properties
Cotton
polyester
cotton/polyester blends
acid dye and disperse dye
Hassan
Ibrahim
hmaibrahim@gmail.com
1
Pretreatment and finishing of Cellulosic fibers
LEAD_AUTHOR
Enas
El- Zairy
fatmaali1811@gmail.com
2
Faculty of Applied Arts, Textile Printing, Dyeing and Finishing Department, Helwan University, Cairo, Egypt
AUTHOR
El-Amir
Emam
hmaibrahim@aol.col
3
Faculty of Applied Arts, Textile Printing, Dyeing and Finishing Department, Helwan University, Cairo, Egypt
AUTHOR
Enas
Saad
tw.tawfik@aol.com
4
Faculty of Applied Arts, Textile Printing, Dyeing and Finishing Department, Helwan University, Cairo, Egypt
AUTHOR