Response Surface Methodology (Rsm) and Its Application for Optimization of Ammonium Ions Removal From Aqueous Solutions by Pumice As a Natural and Low Cost Adsorbent Publisher



Moradi M¹ ; Fazlzadehdavil M² ; Pirsaheb M³ ; Mansouri Y³ ; Khosravi T³ ; Sharafi K^{3, 4}
Source: Archives of Environmental Protection Published:2016

Abstract

This research was conducted to study the adsorption of ammonium ions onto pumice as a natural and low-cost adsorbent. The physico-chemical properties of the pumice granular were characterized by X-ray diffraction (XRD), Fourier transforms infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). Modeling and optimization of a NH4+ sorption process was accomplished by varying four independent parameters (pumice dosage, initial ammonium ion concentration, mixing rate and contact time) using a central composite design (CCD) under response surface methodology (RSM). The optimum conditions for maximum removal of NH4+ (70.3%) were found to be 100 g, 20 mg/l, 300 rpm and 180 min, for pumice dosage, initial NH4+ ion concentration, mixing rate and contact time. It was found that the NH4+ adsorption on the pumice granular was dependent on adsorbent dosage and initial ammonium ion concentration. NH4+ was increased due to decrease the initial concentration of NH4 and increase the contact time, mixing rate and amount of adsorbent. © 2016 Archives of Environmental Protection.