%I Taylor and Francis Inc.
%A E.H. Ezechi
%A S.R.B.M. Kutty
%A M.H. Isa
%A M.S. Liew
%V 57
%T Application of response surface methodology for the optimization of hexavalent chromium removal using a new low-cost adsorbent
%P 22507-22518
%K adsorption; chromium; desalination; equilibrium; kinetics; optimization; response analysis; thermodynamics; weed
%X The adsorption capacity of a novel adsorbent (Ageratum conyzoide leaf powder) was investigated for Cr(VI) removal from aqueous solution. Experiments were designed with the Box�Behnken model of the response surface methodology (RSM). Preliminary experiments were conducted to obtain the optimum range of process variables used for the Box�Behnken model. Three independent variables (pH, initial concentration, and adsorbent mass) were examined. The results show that Cr(VI) removal was more favorable at pH 2. Increase in pH above 2 resulted in negative Cr(VI) removal. Cr(VI) removal increased when adsorbent mass was increased, but decreased with increase in initial concentration. Cr(VI) removal of 92 was obtained at pH 2 and adsorbent mass of 0.3 g. Experiments were successfully optimized by RSM. Kinetics study correlated with the pseudo-second-order kinetic model, whereas equilibrium study was best described by the Langmuir isotherm model with maximum adsorption capacity of 437 mg/g. Thermodynamic parameters indicate a spontaneous, exothermic, and physiosorption process. © 2015 Balaban Desalination Publications. All rights reserved.
%N 47
%R 10.1080/19443994.2015.1129506
%D 2016
%J Desalination and Water Treatment
%L scholars6789
%O cited By 4