@article { author = {}, title = {Preparation and Characterization of Micropours Membranes Based on Modified Polyethersulfon}, journal = {Egyptian Journal of Chemistry}, volume = {59}, number = {3}, pages = {269-283}, year = {2016}, publisher = {National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT}, issn = {0449-2285}, eissn = {2357-0245}, doi = {10.21608/ejchem.2016.1047}, abstract = {Micropours polymeric membranes were prepared from homogeneous solution of Polysulfone (PSF) by phase inversion method. Nmethyl-2-pyrrolidone (NMP) was used as solvent. Polyethylene glycol (PEG) (average molecular weight 6000) was used as the polymeric additive in different concentration in the casting solution. The morphology and structure of the resulting membranes were observed by scanning electron microscope (SEM).The permeation performances of the membranes were evaluated in terms of equilibrium water content (EWC) and Porosity. Thermal and mechanical properties of membranes were analyzed by differential scanning calorimetry (DSC) and thermo-gravimetric analysis (TGA) and a universal mechanical testing machine.Results showed that with increase in concentration of PEG, the pore number as well as average pore size in membranes increases. Membrane with PEG of (5wt. %) has higher (EWC) and porosity due to high porosity. }, keywords = {PSF membrane,porosity,polyethylene glycol (PEG),Phase inversion method}, url = {https://ejchem.journals.ekb.eg/article_1047.html}, eprint = {https://ejchem.journals.ekb.eg/article_1047_06c4f4401a750ba5bd3d3ed434d09f8f.pdf} } @article { author = {}, title = {Synthesis, Biological Evaluation of 1,3,4-Oxadiazole, Triazole and Uracil Derivatives from Poly (ethylene terephthalate) Waste}, journal = {Egyptian Journal of Chemistry}, volume = {59}, number = {3}, pages = {285-303}, year = {2016}, publisher = {National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT}, issn = {0449-2285}, eissn = {2357-0245}, doi = {10.21608/ejchem.2016.1048}, abstract = {POLY(ethylene terephthalate) (PET) was hydrolyzed in aqueous NaOH using solar energy. PET is used as versatile reagent for the synthesis of a variety of heterocyclic compounds. Uracil (6a, b), 1,3,4-oxadiazole (9, 12a, b), 1,3,4-triazole (10, 14), thiadiazole (11a, b and 15) derivatives were synthesized from PET. The antimicrobial and antioxidant activities of the synthesized compounds were evaluated and showed significant activities.    }, keywords = {PET,Oxadiazole,triazole,Thiadiazol,Uracil,Antimicrobial,antioxidant}, url = {https://ejchem.journals.ekb.eg/article_1048.html}, eprint = {https://ejchem.journals.ekb.eg/article_1048_32a318ec9c8fbe7f295c4997c2381271.pdf} } @article { author = {}, title = {Novel One-pot Synthesis of Thiazolo[3,2-a] Pyrimidin-5-one as a Key Compound for Poly Nuclear Heterocycles}, journal = {Egyptian Journal of Chemistry}, volume = {59}, number = {3}, pages = {305-319}, year = {2016}, publisher = {National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT}, issn = {0449-2285}, eissn = {2357-0245}, doi = {10.21608/ejchem.2016.1052}, abstract = {     3 -AMINO-2- hydroxy-7-methyl- thiazolo[3,2-a]pyrimidin-5-one(5) ….was synthesized by one-pot reaction from 2-bromo cyanoacetamide, ethyl acetoacetate  and thiourea. The new 3-amino-2-hydrazino derivatives (15,18), 2-pyrazol- thiazolo [3,2-a] pyrimidin -5-ones )14,17,20) and 2-(4-arylidene) -pyrazol-thiazolo [3,2-a] pyrimidin-5-ones (22a-d) were synthesized through facile condensing procedures starting from 3-amino-2-hydrazino-7-methyl-thiazolo[3,2-a]pyrimidin-5-one (12). The newly synthesized products were characterized by their IR, ESI-MS, NMR and micro analytical data. }, keywords = {Thiazolo [3,2-a] pyrimidin-5-one,One pot synthesis,Condensation,Intramolecular Cyclization and Tautomerism}, url = {https://ejchem.journals.ekb.eg/article_1052.html}, eprint = {https://ejchem.journals.ekb.eg/article_1052_aa42107bc27ec7af9d7175d691803f70.pdf} } @article { author = {}, title = {Groundwater in Egypt Issue: Resources, Location, Amount, Contamination, Protection, Renewal, Future Overview}, journal = {Egyptian Journal of Chemistry}, volume = {59}, number = {3}, pages = {321-362}, year = {2016}, publisher = {National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT}, issn = {0449-2285}, eissn = {2357-0245}, doi = {10.21608/ejchem.2016.1085}, abstract = {THE PRESENT review is concerning with the groundwater issue in Egypt. Groundwater is one of the most important resources of water in Egypt. It ranks as the second source after the NileRiver. In addition, there are different groundwater aquifers with variable importance for exploitation in the Nile river region. They are ranging from shallow local aquifers, recharged by rainfall, to deep non-replenishable aquifers. The first comprises groundwater in the NileValley and Delta system. The second aquifer category is the non-renewable type, which is located in the “Western Desert-Nubian Sandstone Aquifer”. Non-renewable groundwater exploitation is estimated at a rate of 1.65 Billion m3/year (BCM/year). It is mainly concentrated at the Western Desert Oases with 0.5 BCM/yr. On the other side, the amount of groundwater abstractions in Delta, Sinai and NewValley are about 5.1 BCM/yr. It is estimated that about 200,000 BCM of fresh water are stored in the NewValley's Oasis aquifer only. The water is at the depth of 60-100 m around the area of East-Oweinat. In Sinai, groundwater is mainly encountered in three different water-bearing aquifers. Further information concerning groundwater issue in Egypt, locations, origin, amount, quality and quantities, contamination, natural aquifer treatment, protection, uses, future overview and conclusion are included and discussed in details in this review.    }, keywords = {Groundwater,Egypt,water resources,Location of groundwater,Amount of groundwater,Groundwater contamination,Groundwater protection,Groundwater renewable,Future overview and Issue of groundwater}, url = {https://ejchem.journals.ekb.eg/article_1085.html}, eprint = {https://ejchem.journals.ekb.eg/article_1085_05d115ef6d0f11c01423cf2ae8fa0a7c.pdf} } @article { author = {}, title = {Hydrotreating of Egyptian Heavy Vacuum Gas Oil over Co-Mo/Carbon Nanotube Catalyst}, journal = {Egyptian Journal of Chemistry}, volume = {59}, number = {3}, pages = {363-379}, year = {2016}, publisher = {National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT}, issn = {0449-2285}, eissn = {2357-0245}, doi = {10.21608/ejchem.2016.1086}, abstract = {          THE HYDROTREATING catalyst development is an essential ……..factor to produce clean fuels. The catalytic performance of CoMoS/CNT on Hydrotreating of the Egyptian heavy vacuum gas oil was investigated. Firstly the CNT was functionalized with concentrated HNO3. The Mo and Co wt% were loaded on CNT by impregnation methods. The catalyst was characterized by X-ray diffraction, Raman Spectroscopy, TEM, and BET. The hydrotreating experiments were conducted on autoclave reactor at various operating conditions of Temperature (325-375) oC, pressure (20- 60) bar, time (2-6) h and cat/oil ratio of 1:75, 33 and 10. The result indicated that the CoMoS/CNT was an efficient for the hydrotreating process. Also, the hydride-sulfurization (HDS) enhanced with increasing catalyst/oil ratio. Moreover, Results revealed that the optimum condition (temperature 350 oC, Pressure 40 bar, catalyst/oil ratio of 1:75 for 2 hr, was chosen. Additionally, even at low catalyst ratio of 1:75 an acceptable HDS% of 77.1 was achieved.        }, keywords = {Hydrotreatment,Heavy vacuum gas oil (HVGO),Carbon nanotubes and CoMo/CNT}, url = {https://ejchem.journals.ekb.eg/article_1086.html}, eprint = {https://ejchem.journals.ekb.eg/article_1086_9758f485e26328404db36fa072e1120b.pdf} } @article { author = {}, title = {Effect of the Synthesis Conditions on The Desulfurization Power of Mesoporous Alumin}, journal = {Egyptian Journal of Chemistry}, volume = {59}, number = {3}, pages = {381-396}, year = {2016}, publisher = {National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT}, issn = {0449-2285}, eissn = {2357-0245}, doi = {10.21608/ejchem.2016.1088}, abstract = {      MESOPOROUS alumina with narrow pore size  ……...distribution was synthesized using precipitation method. The effect of various synthesis parameters, including reactants molar ratio, type of co-surfactant, aging time and power source (conventional electric heating (CE) and microwave irradiation (MW)) on the structural properties of the resultant alumina samples were examined. The texture and crystalline phase of the prepared samples were characterized using N2 adsorption-desorption, pyridine adsorption, XRD, TG-DTA, and TEM. The adsorption activity of the prepared samples was examined towards thiophene and dibenzothiophene species.The prepared alumina samples exhibited narrow pore size distribution with high surface area about 262-334 m2/g, and large mesoporous frameworks with ordered worm-like pores. The preliminary results on the adsorption of sulphur compounds showed that the prepared alumina samples using microwave irradiation as power source and i-propanol as co-surfactant showed distinguished adsorption activities. The structural properties obtained are very interesting for potential applications in desulfurization process in petroleum refining.    }, keywords = {Mesoporous,Alumina,desulfurization,Adsorption,Dibenzothiophene and Microwave}, url = {https://ejchem.journals.ekb.eg/article_1088.html}, eprint = {https://ejchem.journals.ekb.eg/article_1088_387f9fa373a31c4541528916cf10aebe.pdf} } @article { author = {Ibrahim, Amal M. and Abd El-Latif, M.M. and Selim, M.M.}, title = {Erratum: Phase Formation and Evaluation of Calcium Phosphate Ceramics Using Eggshell Waste}, journal = {Egyptian Journal of Chemistry}, volume = {59}, number = {3}, pages = {397-405}, year = {2016}, publisher = {National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT}, issn = {0449-2285}, eissn = {2357-0245}, doi = {10.21608/ejchem.2016.1099}, abstract = {        CALCIUM phosphate ceramics are considered as a family of the ……most important bio-inorganic materials used in biomedical applications. Calcium phosphates were prepared from eggshell waste and phosphoric acid after cleaning eggshell precursor and converting it to calcium oxide by calcination. The phases obtained from such reaction were dependent not only on the weight ratio of calcined eggshell powder and phosphoric acid (Ca/P) but also on the calcination temperature of the obtained mixture. Effects of Ca/P ratio and calcination temperature were studied and the phases obtained were evaluated using X-Ray Diffraction spectroscopy (XRD) and Scanning Electron Microscopy (SEM). }, keywords = {}, url = {https://ejchem.journals.ekb.eg/article_1099.html}, eprint = {https://ejchem.journals.ekb.eg/article_1099_5973a493e0b9c521a5c83043f47d6d28.pdf} } @article { author = {}, title = {Sol-gel Hybrid Nanomaterials Based on TiO2/SiO2 as Multifunctional Finishing for Cotton Fabric}, journal = {Egyptian Journal of Chemistry}, volume = {59}, number = {3}, pages = {407-427}, year = {2016}, publisher = {National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT}, issn = {0449-2285}, eissn = {2357-0245}, doi = {10.21608/ejchem.2016.1100}, abstract = {          THIS work principally manages a novel multifunctional covering ……...for giving, fire resistant, UV-protection and water repellent properties for cotton fabrics utilizing TiO2 and TiO2/SiO2 nano-particles. We show the preparation and the application of TiO2 and TiO2/SiO2 nanomaterials. The utilization of the nanomaterials on cottton fabric was accomplished by utilizing different polycarboxylic acids i.e. (Citric acid [CA], Succinic acid [SA], and 1,2,3,4-Butanetetracarboxylic acids [BTCA]) in the presence of sodium hypophosphite (SHP) which used  as catalyst using traditional Pad-dry-cure technique. The impacts of carboxylic group number in the different polycarboxylic acids on the UV-protection and physical properties, of cross-linked cotton fabrics are researched. Some mechanical properties of coated cotton fabric (whiteness, roughness, and Crease recovery angle [CRA]) were analyzed. In addition, the impact of post treatment with various silane derivatives based on tetraethylorthosilicate (TEOS)/or 3-glycidyloxypropyltrimethoxysilane (GPTMS) on thermal stability of treated fabrics and additionally the water repellent property was also examined.}, keywords = {}, url = {https://ejchem.journals.ekb.eg/article_1100.html}, eprint = {https://ejchem.journals.ekb.eg/article_1100_9ae63dbc5a96fbc75cf66c9bdee8fdf4.pdf} }