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RISS 인기검색어
- 검색키워드
- 저자 : Hamad A. Al-Lohedan (검색결과 4 건)
- 무료
- 기관 내 무료
- 유료
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M.Z.A. Rafiquee,Masoom R. Siddiqui,H.N. Haque,M. Shamsul Ola,Hamad A. Al-Lohedan,Z.A. ALOthman,Saikh M. Wabaidur 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.34 No.-
Reduction of molecular oxygen by 2-mercaptoethanol in the presence of cobalt(II)histidine is described. Cobalt(II)histidine complex forms dinuclear 2:1 (Co:O2) complex with molecular oxygen (m-dioxyte-trakis(histidinato)dicobalt(II)). The molecular oxygen did not directly react with 2-mercaptoethanol, but,reacted in the form of an adduct with cobalt(II)histidine complex. During the course of the reaction themolecular oxygen is reduced to hydroxide ion while the cobalt(II)histidine complex was oxidized tocobalt(III)histidine while 2-mercaptoethanol is reduced into 2,20-dithiodiethanol. The decrease inabsorbance for the dioxygen complex was monitored spectrophotometrically and was observed that thevalues of rate constant increased with the increase in [2-mercaptoethanol]. The values of kobs also increasedwith increasing [NaOH]. Thus, from the results of these studies, mechanism of the reaction has beenproposed. In addition, the values of various equilibrium constants and rate constants were also determinedusing nonlinear least square techniques.
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Ayman M. Atta,Hamad A. Al-Lohedan,Z.A. ALOthman,Ahmed A. Abdel-Khalek,Ahmed M. Tawfeek 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.31 No.-
The present work aims to reduce the water surface tension using dispersed organophilic clay minerals toincrease the adsorption water pollutants (organic and inorganic) into the clay galleries. Therefore,sodium montmorillonite (Na-MMT) was functionalized with amphphiles based on crosslinked nanogelpolymers of N-isopropylacrylamide (NIPAm), sodium 2-acrylamido-2-methylpropane sulfonate (Na-AMPS), acrylamide (AAm) and acrylamidopropyl)trimethylammonium chloride solution (APTAC) usingsurfactant free technique. The chemical interactions between nanogels and Na-MMT and their chemicalstructure were confirmed by FTIR analysis. The intercalation and exfoliation of Na-MMT were confirmedby wide-angle X-ray diffraction. The morphology of Na-MMT nanogel composites was investigated byTEM analysis. The adsorption capacities of the prepared Na-MMT nanogels for methylene blue dye,cobalt and nickel cations from water were investigated. The data indicated that the Na-MMT nanogelsreduced the surface tension of water and efficiently remove dye and metal ions from water.
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Ayman M. Atta,Hamad A. Al-Lohedan,Mahmood M.S. Abdullah,Shymaa M. ElSaeed 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.33 No.-
This work reports the synthesis and application of amphiphilic ionic liquid (IL) in the petroleum field. Theionic liquid was synthesized by etherification of octadecylamine with tetraethylene glycol followed byquaternization with p-toluene sulfonic acid. The chemical structure was confirmed by NMRspectroscopy. The surface activity, aggregation, adsorption, and the solubility of the ethoxylatedoctadecylammonium tosylate were investigated. The interfacial parameters between IL aqueoussolution and crude oil emulsions were determined from interfacial tension measurement. The resultsshowed the dependence of interfacial tension on the concentration, crude oil emulsion composition andchemical structure of the prepared amphiphiles. The mechanism of aggregation and adsorptionethoxylated octadecylammonium tosylate was proposed and confirmed at different interfaces. Thedemulsification and oil spill dispersion efficiencies were investigated at different amphiphileconcentrations. The performance of amphiphilic ILs revealed that their demulsification efficiencyreached 100% and the settling time required for efficient separation decreased with increment of watercontents of crude oil emulsions. Moreover, the prepared amphiphilic ILs achieved oil spill dispersionefficiency more than 80% at surfactant oil ratio (1:25).
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Faruq Mohammad,Tanvir Arfin,Hamad A. Al-Lohedan 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.45 No.-
Nano ceria is considered to be an antioxidative agent due to its fast oxido-reductive capability and therehas been a number of studies that deal with the non-toxic nature of cerium oxide; however, theantioxidative capacity is mostly influenced by the presence of Ce3+/Ce4+ in the sample. We studied for thefirst time the oxidative nature of CeO2 nanoparticles (NPs) on in vitro systems and we hypothesized that ifthe oxido-reductive behavior of Ce is not well utilized which may lead to adverse toxic effects. Since, wehave been interested to combine the oxido-reductive potential of nano ceria with that of theantimicrobial, antioxidative, and biosorption properties of trimethyl chitosan (TMC). We hypothesizethat such a design will not only modulate the oxidant activity of CeO2 NPs, but also will help to provideenhanced antimicrobial, antioxidative, and adsorption properties. We present here the synthesis,characterization, biological activity and biosorption performance of the TMC-CeO2 composite and itsefficiency was tested by comparing the results with that of other materials (pure CeO2, pure chitosan, andpure TMC). The polymer composite formation was thoroughly analyzed by means of UV–vis, FTIR, zetapotential, powdered XRD, and XPS studies. Further, the in vitro antibacterial and antioxidative assaysproved that the coating of CeO2 with TMC biopolymer significantly enhances its biological efficiency byincreasing the interaction of the CeO2 composite with that of bacterial cell wall, and also serving as thefree radical scavenger. In addition to bioactivity, we also observed some enhanced biosorptionperformance towards the removal of phenolic compounds (phenol, 2-chlorophenol, and 4-chlorophenol)by the TMC-CeO2 composite, thereby supporting its role during the waste water treatment.
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