Application of Central Composite Design approach for removal of chromium (VI) from aqueous solution using weakly anionic resin: Modeling, optimization, and study of interactive variables

► Use of weakly anionic divinylbenzene copolymer resin for Cr (VI) removal. ► Response surface methodology approach was used to optimize the process variables. ► A quadratic model was developed and validated experimentally. ► Resin dose was found to be most significant individual variable. ► Functional groups involved during reaction were studied using FTIR/EDX.