Preparation of Coal Gangue Based LSX Zeolite and Its Application for Zn2+ and Ni2+ Adsorption

Abstract

In this paper, LSX zeolite was synthesized in a sodium-potassium system through the traditional hydrothermal synthesis method with coal gangue in Wuhai area as raw material. The synthesized products were characterized by XRD, SEM, TEM, BET, IR and so on. The synthetic LSX zeolite was utilized to adsorb simulated wastewater containing Zn2+ and Ni2+, and the optimal adsorption conditions were determined. The removal rate and adsorption capacity of Zn2+ and Ni2+ were studied under these conditions, which were 96.36%, 96.83%, 96.36, 72.62 mg/g, respectively. The zeolite after adsorption saturation can be recycled 4 times in the mixed solution of 6% NaOH and 1% NaCl as the regenerant, and the regeneration rate is above 90%.