Adsorption effect of cadmium and arsenic by magnetic biochar
LI Jing-xin, TANG Dong-shan, XU Wan-bing, WANG Bao-ru
Hengyang Key Laboratory for Soil Contamination Control and Remediation Technology, Resource Environment and Safety Engineering College, University of South China, Hengyang 421001, China
Abstract: Fe3O4 is used to modify husk biochar to obtain magnetic biochar.The obtained biochar is characterized by SEM and XRD.Response surface optimization and co-adsorption experiments are conducted to investigate the adsorption performance of the biochar to As3+ and Cd2+ in the co-adsorption system.The results show that the removal rates of the biochar to cadmium and arsenic respectively reach the highest when pH is 5.0,initial mass concentration of As3+ or Cd2+ is 10 mg·L-1 and adsorbent dosage is 1 g·L-1.In As3+/Cd2+co-adsorption experiment,when the mass concentration of Cd2+ ix more than 20 mg·L-1,it can inhibit the adsorption of As3+ by the biochar,the adsorption capacity of the biochar to 50 mg·L-1 Cd2+ increases from 17.44 mg·g-1 to 31.91 mg·g-1 after the pre-equilibrium between 10 mg·L-1 As3+ and the biochar,indicating there is a synergistic adsorption effect between arsenic and cadmium.This synergistic effect is due to the formation of B-type ternary surface complexes of Cd,As and Fe3O4,which can increase the adsorption capacity of cadmium.
李景心, 唐东山, 许婉冰, 王宝茹. 磁性生物炭对镉、砷的吸附效果研究[J]. 现代化工, 2020, 40(7): 160-165.
LI Jing-xin, TANG Dong-shan, XU Wan-bing, WANG Bao-ru. Adsorption effect of cadmium and arsenic by magnetic biochar. Modern Chemical Industry, 2020, 40(7): 160-165.
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