Promoted adsorption performance for sulfide over CuO loaded hydrotalcite

Abstract

Sulfide is commonly found in wastewater from oil refining, petrochemical, pharmaceutical and other industries and must be removed because of its toxicity, odor and corrosiveness. In this research, the CuO loaded hydrotalcite adsorbent (CuO-HT) was prepared by the impregnation method. The as-prepared adsorbent was characterized by X-ray diffraction, scanning electron microsco-py-mapping, X-ray photoelectron spectroscopy, Fourier-transform infrared spectroscopy and N2 adsorption–desorption isotherms. The effect of CuO loading amount and calcination temperature on adsorption performance of industrial hydrotalcite for sulfide was examined in this experiment. The results reveal that the sulfide removal performance over CuO-HT is improvement. Among the as-prepared adsorbents, the hydrotalcite loaded with 5% Cu and calcined at 300°C (CuO-HT-5-300) had the highest removal rate of sulfide, and the removal rate is nearly 100% in 80 min. After four regenerated times, the adsorption rate of the adsorbent could still reach 90%. In the composite adsor-bent, CuO was identified as the primary active element on the hydrotalcite carrier. The modified hydrotalcite had high sulfide adsorption capacity and excellent regeneration performance.