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Hafiz Badaruddin Ahmad,Muhammad Zuber,Yasir Abbas,Mazhar Hussain,Naeem Akhtar,Tariq Mahmood Ansari,Khalid Mahmood Zia,Shafiq Ahmad Arain 한국화학공학회 2014 Korean Journal of Chemical Engineering Vol.31 No.2
Arsenic and nitrate are ill-famed environmental pollutants that are responsible for various lethal diseases. Their removal from drinking water is very essential. In present study, newly synthesized alumina supported nano zerovalentzinc (Alumina-nZvZ) has been tested to remove arsenic and nitrate. Quantitative analyses of arsenic have beenperformed spectrophotometrically and while that of nitrates ions colorimetrically. After optimization of time and amountof adsorbent, Langmuir, Freundlich and D-R isotherms were applied to determine different parameters for the assessmentof adsorption. Synthesized samples were characterized by scanning electron microscopy (SEM) to evaluate porosityand void size. Alumina coated with reduced ZnCl2 showed better efficiency for removal of arsenic and nitrate ions. Kinetics of adsorption was evaluated by using pseudo first-order and pseudo second-order rate equations.
Hafiz Badaruddin Ahmad,Gul E Yasmin,Shafique Ahmad Arain,Ijaz Ahmad Bhatti,Mazhar Hussain 한국화학공학회 2015 Korean Journal of Chemical Engineering Vol.32 No.4
Arsenic contamination in drinking water is alarming for human beings; especially for those people whouse ground water directly for drinking purposes. Attempts were made to design adsorbents for the removal of arsenic. Silica gel has been tested as adsorbent for such removal. After optimizing concentration, time and amount of adsorbent,Langmuir, Freundlich and D-R isotherms are drawn to determine different parameters for the evaluation of arsenicadsorption. Kinetics of adsorption is also calculated by using pseudo first order and pseudo second order rate equations. Zerovalent iron and manganese nanoparticles have been coated on silica gel and efficiency of removal of arsenichave been determined. Iron and manganese particles have been stabilized with polyvinyl alcohol (PVA). Similarly mixturesof iron-silver and manganese-silver nanoparticles have been synthesized by stabilizing with PVA, which show betterefficiency than individual nanoparticles of iron and manganese coated silica gel. The newly synthesized adsorbentsare very much effective for not only arsenic but also for antimicrobial activity. Concentration of arsenic in water hasbeen determined spectrophotometrically using variamine blue as indicator.