2024-03-29T09:24:03Z
https://ejchem.journals.ekb.eg/?_action=export&rf=summon&issue=5261
Egyptian Journal of Chemistry
Egypt. J. Chem.
0449-2285
0449-2285
2019
62
5
Eco-friendly Mimosa Tannin Adhesive System for Bagasse Particleboard Fabrication
Essam
Abd El-Sayed
Mohamed
El-Sakhawy
Samir
Kamel
Ahmed
El-Gendy
Ragab
Abouzeid
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.
Keywords: mimosa tannin
paraformaldehyde
Adhesive
bagasse
particleboard
Characterization
2019
05
01
777
787
https://ejchem.journals.ekb.eg/article_22493_958a0ae3b85d3859948b9dca8c628ca5.pdf
Egyptian Journal of Chemistry
Egypt. J. Chem.
0449-2285
0449-2285
2019
62
5
Fe3O4 Nanoparticles: Synthesis, Characterization and Application in Removal of Iron from Aqueous Solution and Groundwater A.A.
Abd El-Samih
Swelam
Magdy
Awad
yahia
Gedamy
Ahmed
Bedair
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.
Magnetic iron oxide nanoparticles
Heavy metals ions
adsorption isotherms
Kinetics
Thermodynamics
2019
05
01
789
709
https://ejchem.journals.ekb.eg/article_23892_e9e1c282ef0b36a3574422ae473602ab.pdf
Egyptian Journal of Chemistry
Egypt. J. Chem.
0449-2285
0449-2285
2019
62
5
Mitigation of Hydrogen Evolution during Zinc Corrosion in Aqueous Acidic Media Using 5-Amino-4-imidazolecarboxamide
S
El Wanees
M
Alahmdi
M
Alsharif
Y
Atef
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.
imidazole
zinc
Corrosion inhibition
Hydrogen production
Potentiodynamic
impedance
2019
05
01
811
825
https://ejchem.journals.ekb.eg/article_22494_526e7f1e7576d078124ff6010f20484f.pdf
Egyptian Journal of Chemistry
Egypt. J. Chem.
0449-2285
0449-2285
2019
62
5
Beta-cyclodextrin Grafted with Poly (ε-caprolactone) for Ibuprofen Delivery System
Ahmed
Haroun
Ali
Osman
Sayed
Ahmed
Ahmed
Elghandour
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.
β-cyclodextrin
ε-caprolactone
Ibuprofen
ring-opening polymerization
in vitro drug release
2019
05
01
827
835
https://ejchem.journals.ekb.eg/article_21201_f7738c204ab6c2d2f8aba42636cf2ffe.pdf
Egyptian Journal of Chemistry
Egypt. J. Chem.
0449-2285
0449-2285
2019
62
5
A Novel Microwave Synthesis of Manganese Based MOF for Adsorptive of Cd(II), Pb(II) and Hg(II) Ions from Aqua Medium
Howaida
Abd El Salam
Tamer
Sharara
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.
Manganese-MOF
Cd(II)
pb(II)
Hg(II)
Adsorption
interaction mechanism
2019
05
01
837
851
https://ejchem.journals.ekb.eg/article_23374_2220d150fb9291a8e5a0c5b08cc25e92.pdf
Egyptian Journal of Chemistry
Egypt. J. Chem.
0449-2285
0449-2285
2019
62
5
Microwave Assisted Synthesis of Some Azo Disperse Dyes withAntibacterial Activities. Part 1
Morsy
Elapasery
Abdelhaleem
Hussein
Abubaker
Eladasy
Mohamed
Saleh
Magda
Kamel
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
Disperse dyes
Microwave irradiation
Antibacterial
2019
05
01
853
859
https://ejchem.journals.ekb.eg/article_22428_ea291e06dfdd747ec0560333fd1d68a2.pdf
Egyptian Journal of Chemistry
Egypt. J. Chem.
0449-2285
0449-2285
2019
62
5
Antibacterial Treatment of Cotton Fabrics using Methylisothiazolinone
Mohamed
Shaaban
Ahmed
Montaser
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.
Antibacterial activity
Cotton
finishing and Methylisothiazolinone
2019
05
01
861
867
https://ejchem.journals.ekb.eg/article_22961_a5a63f7e9275acc9c82ace5091d0dd4d.pdf
Egyptian Journal of Chemistry
Egypt. J. Chem.
0449-2285
0449-2285
2019
62
5
Influence of Blend Ratio on The Electrical Characteristics of Vulcanized SBR/NBR Blends Compatibilized by Cis-polybutadiene Rubber
Elbadawy
Kamoun
Ahmed
Doma
Sayed
Abboudy
Sherine
Khattab
Ali
El-Bardan
Mohamed
Belal
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.
SBR/NBR blends, CBR Compatibilizer, Thermal properties
Impedance spectroscopy
Electrical characteristics
2019
05
01
869
883
https://ejchem.journals.ekb.eg/article_21202_32085561d4c7c6933c78548547bfb1fc.pdf
Egyptian Journal of Chemistry
Egypt. J. Chem.
0449-2285
0449-2285
2019
62
5
Preparation and Evaluation of Paint One and Two Shells Micro-capsules
Ahmed
Ramadan
Ahmed
Amer
Abdel aziz
Gomaa
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.
Micro-capsules – one shell – two shells – surfactant – shrinking time
2019
05
01
885
896
https://ejchem.journals.ekb.eg/article_22429_9fcf3d848be9ed4450c75b7628a53681.pdf
Egyptian Journal of Chemistry
Egypt. J. Chem.
0449-2285
0449-2285
2019
62
5
Preparation and Evaluation of Coating Have One and Two Shells (Part 2)
Ahmed
Ramadan
Ahmed
Amer
Abdel aziz
Gomaa
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.
Micro-capsules – self-healing – one shell – two shells
2019
05
01
897
911
https://ejchem.journals.ekb.eg/article_22430_4d71f0189d3547d6226d1f4b51dc648c.pdf
Egyptian Journal of Chemistry
Egypt. J. Chem.
0449-2285
0449-2285
2019
62
5
Studying of Physico-Mechanical and Electrical Properties of Polypropylene/ Nano-Copper Composites for Industrial Applications
Lamiaa
Mohamed
Alaa I.
Eid
Omayma A.
El kady
Ashraf K.
Eessaa
Shaimaa A.
Esmail
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.
Nano-copper/polypropylene composite
Thermal properties
electrical conductivity
tensile strength
2019
05
01
913
920
https://ejchem.journals.ekb.eg/article_22960_94e3ea9f74b9b9c3923c47f90b085b85.pdf
Egyptian Journal of Chemistry
Egypt. J. Chem.
0449-2285
0449-2285
2019
62
5
Effect of Vinyltrimethoxysilane as a Coupling Agent on The Mechanical and Electrical Properties of Acrylic Rubber
Basma
Saleh
Samir
Lawandy
Farag
AbdAlHai
Ahmed
Abd el-Hakim
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.
Acrylic rubber
silane
rheometric characteristics
SEM
mechanical and
electrical properties
2019
05
01
921
936
https://ejchem.journals.ekb.eg/article_23038_9271455f17caec110b54d886b120825c.pdf
Egyptian Journal of Chemistry
Egypt. J. Chem.
0449-2285
0449-2285
2019
62
5
Nano-chamomile Waste as a Low-cost Biosorbent for Rapid Removal of Heavy Metal Ions from Natural Water Samples
Tamer
Hasanin
Salwa
Ahmed
Taghreed
Barakat
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.
Nano chamomile waste
Heavy metal removal
Natural water samples
adsorption isotherms
Kinetic studies
Biosorbance
2019
05
01
937
953
https://ejchem.journals.ekb.eg/article_23470_13460da63daeb50979519ca5cdee008c.pdf
Egyptian Journal of Chemistry
Egypt. J. Chem.
0449-2285
0449-2285
2019
62
5
Effect of The Precursors and Synthesis Methods on The Optical and Photo- electrochemical Characteristics of SnS Absorber Layer
Atef
Shenouda
Mustafa
Sanad
Ofeliya
Kostadinova
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%.
SnS absorber layer
Electrochemical impedance spectroscopy
photoelectrochemical investigation
2019
05
01
955
964
https://ejchem.journals.ekb.eg/article_22959_f2c70f97d51505252be4a0aa54be64d8.pdf
Egyptian Journal of Chemistry
Egypt. J. Chem.
0449-2285
0449-2285
2019
62
5
Combined antimicrobial finishing & dyeing properties of cotton, polyester fabrics and their blends with acid and disperse dyes
Hassan
Ibrahim
Enas
El- Zairy
El-Amir
Emam
Enas
Saad
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.
Carboxymethyl chitosan antimicrobial finishing
dyeing properties
Cotton
polyester
cotton/polyester blends
acid dye and disperse dye
2019
05
01
965
976
https://ejchem.journals.ekb.eg/article_21204_c2ab18820ab9ac9d2938996347dfe0d6.pdf