%0 Journal Article
%@ 19443994
%A Ezechi, E.H.
%A Kutty, S.R.B.M.
%A Isa, M.H.
%A Liew, M.S.
%D 2016
%F scholars:6789
%I Taylor and Francis Inc.
%J Desalination and Water Treatment
%K adsorption; chromium; desalination; equilibrium; kinetics; optimization; response analysis; thermodynamics; weed
%N 47
%P 22507-22518
%R 10.1080/19443994.2015.1129506
%T Application of response surface methodology for the optimization of hexavalent chromium removal using a new low-cost adsorbent
%U https://khub.utp.edu.my/scholars/6789/
%V 57
%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.
%Z cited By 4