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Esra Bilgin Simsek,Ulker Beker 한국화학공학회 2014 Korean Journal of Chemical Engineering Vol.31 No.11
Arsenic adsorption properties of mono- (Fe or Al) and binary (Fe-Al) metal oxides supported on natural ze-olite were investigated at three levels of temperature (298, 318 and 338 K). All data obtained from equilibrium experimentswere analyzed by Freundlich, Langmuir, Dubinin-Radushkevich, Sips, Toth and Redlich-Peterson isotherms, and errorfunctions were used to predict the best fitting model. The error analysis demonstrated that the As(V) adsorption pro-cesses were best described by the Dubinin-Raduskevich model with the lowest sum of normalized error values. Ac-cording to results, the presence of iron and aluminum oxides in the zeolite network improved the As(V) adsorptioncapacity of the raw zeolite (ZNa). The X-ray photoelectron spectroscopy (XPS) analyses of ZNa-Fe and ZNa-AlFesamples suggested that the redox reactions are the postulated mechanisms for the adsorption onto them while the ad-sorption process is followed by surface complexation reactions for ZNa-Al.