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Application of response surface methodology for the optimization of hexavalent chromium removal using a new low-cost adsorbent

Ezechi, E.H. and Kutty, S.R.B.M. and Isa, M.H. and Liew, M.S. (2016) Application of response surface methodology for the optimization of hexavalent chromium removal using a new low-cost adsorbent. Desalination and Water Treatment, 57 (47). pp. 22507-22518.

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Abstract

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.

Item Type:Article
Impact Factor:cited By 2
Uncontrolled Keywords:adsorption; chromium; desalination; equilibrium; kinetics; optimization; response analysis; thermodynamics; weed
ID Code:25690
Deposited By: Ms Sharifah Fahimah Saiyed Yeop
Deposited On:27 Aug 2021 09:40
Last Modified:27 Aug 2021 09:40

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