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RISS 인기검색어
- 검색키워드
- 저자 : Faruq Mohammad (검색결과 2 건)
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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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DC electrical conductivity of nano-composite polystyrene–titanium–arsenate membrane
Tanvir Arfin,Faruq Mohammad 한국공업화학회 2013 Journal of Industrial and Engineering Chemistry Vol.19 No.6
In continuation to our previous work with nano-composite polystyrene–titanium–arsenate (PS–Ti–As),we further extended the characterization by means of DSC, TEM and mercury porosimetry measurements. In addition to the extended characterization, we also investigated the DC electrical conductivity behaviour of the PS–Ti–As composite membrane under different time, temperature and electrolyte conditions. The conductivity of the membrane investigated in the temperature region of 30–200 8C using a four-in-line probe DC measurement and in the semi-conductor region of 10-5–10-3 S cm-1, found to obey the Arrhenius equation. From the time and temperature dependent conductivity studies on the HCl doped composite, it was observed that the conductivity increases with increase of temperature until 100 8C and further decreased with time during 120–160 8C, which can be attributed to the loss of HCl dopant molecules and blocking of the chemical reactions associated with the dopant. Further, we studied the stability of DC electrical conductivity retention in an oxidative environment by two slightly different techniques viz. isothermal and cyclic.
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