Adsorption Study of Cr(VI) by Modified Industrial Waste Biochar

Abstract

In order to explore the resource utilization of industrial waste and improve the adsorption capacity of industrial waste biochar for Cr(VI) in water, industrial waste biochar of alkali modification was prepared by sodium hydroxide, and its adsorption characteristics for Cr(VI) were studied by adsorption experiments. The results showed that the adsorption of Cr(VI) on biochar was favorable when pH=2 and dosage of adsorbent was 40 mg. The adsorption of Cr(VI) on the biochar before and after alkali modification was conform with the quasi-second-order kinetic equation(semi-second-order kinetic equation) and Langmuir model, which indicated that adsorption was monomolecular chemisorption, and the adsorption effect of Cr(VI) on the industrial waste biochar after alkali modification was better than the unmodified biochar.Therefore, the adsorption of heavy metal chromium by industrial waste biochar has great application potential, and also provides a new way for the utilization of industrial waste.