Removal of arsenic from ground water by modified Sabzevar zeolite

The existence of arsenic in water is one of the main problems of the world, especially in developing countries. One of the methods suggested for removal of arsenic is the use of adsorbents. In this study, natural Sabzevar zeolite was modified with HDTMA-Br, HCl, NaCl and FeCl۳.۶H۲O for the adsorption of arsenic. It was found that zeolite modified with FeCl۳.۶H۲O was best for the removal of arsenic. Contact time (h), pH, zeolite particle size (mesh) and amount of zeolite (g) as the important parameters were optimized by Taguchi method. The optimum values for these parameters were contact time of five h, pH=۳, and ۱۰۰-۲۰۰ mesh particles. The maximum adsorption capacity of ۹۹.۵% was obtained at optimum condition. Reactivation of the modified zeolite using HCl showed that the reactivated zeolite adsorbed ۹۸% of the arsenic, a slight decrease compared to the original material. The presented adsorption process is a green and economical process for removing arsenic from water and contaminated groundwater.

کلیدواژه ها:

Arsenic ، Adsorption ، Natural Sabzevar Zeolite ، Modified Zeolite