四种生物质黄原酸盐对废水中镉和铅的吸附作用
Adsorption of cadmium and lead in wastewater by four kinds of biomass xanthates.
作者信息
Li Wunan, Liao Xiaoyong, Wang Lingqing, Huang Zhanbin
机构信息
School of Chemical & Environmental Engineering, China University of Mining & Technology, Beijing 100083, China; Key Laboratory of Land Surface Pattern and Simulation, Beijing Key Laboratory of Environmental Damage Assessment and Remediation, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Science (CAS), Beijing 100101, China E-mail:
Key Laboratory of Land Surface Pattern and Simulation, Beijing Key Laboratory of Environmental Damage Assessment and Remediation, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Science (CAS), Beijing 100101, China E-mail:
出版信息
Water Sci Technol. 2019 Mar;79(6):1222-1230. doi: 10.2166/wst.2019.124.
This study determined the adsorption of Cd and Pb (100 mg·L of each) in simulated wastewater by biomass xanthates made from starch, chitosan, wheat stalk and corn stalk. The results showed that the adsorption efficiency of Pb and Cd ions followed the order: corn stalk xanthate > wheat stalk xanthate ≥ chitosan xanthate > starch xanthate. The results of kinetic modeling showed that the adsorption process was characterized by physical-chemical adsorption, and that a second-order kinetics equation described the adsorption process well. The optimum conditions for the adsorption of Cd and Pb by corn stalk xanthate were: adsorption time 2 hours, temperature 20-25 °C, and pH 6-8. The results serve as a reference for treating wastewater containing Cd and Pb2.
本研究测定了由淀粉、壳聚糖、小麦秸秆和玉米秸秆制成的生物质黄原酸盐对模拟废水中镉和铅（各100 mg·L）的吸附情况。结果表明，铅离子和镉离子的吸附效率顺序为：玉米秸秆黄原酸盐＞小麦秸秆黄原酸盐≥壳聚糖黄原酸盐＞淀粉黄原酸盐。动力学模型结果表明，吸附过程以物理化学吸附为特征，二级动力学方程能很好地描述吸附过程。玉米秸秆黄原酸盐吸附镉和铅的最佳条件为：吸附时间2小时，温度20 - 25℃，pH值6 - 8。研究结果可为含镉和铅废水的处理提供参考。
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