Abstract: A new type of highly efficient adsorbent,Hg-modified chitosan(Hg-CTS) has been prepared by chemical coordination method,using two kinds of organic acids,mercury sulfate and chitosan as raw materials,and its physio-chemical characteristics and microcosmic structure characterized by measures,such as FT-IR,XRD,XPS,SEM,etc. The effects of the prepared adsorbent dosage,solution initial pH and adsorption time on the adsorption of Cl^- in sulfuric acid wastewater have been investigated. The experimental results show that the removing rate of Cl^- is 94% and adsorption capacity of Hg-CTS 117.42 mg/g,under the following optimal conditions,the Cl^- initial concentration is 1 000 mg/L,Hg-CTS dosage 0.8 g/L,adsorption time 20 min and pH value 3. In addition,the adsorption kinetics of Cl^- by Hg-CTS adsorbent conforms to pseudo-second-order kinetics model.

Key words: chitosan, sulfuric acid wastewater, dechlorination, adsorption

摘要： 采用了化学配位的方法，以两种有机酸、硫酸汞和壳聚糖为原料制备出Hg²⁺改性壳聚糖（Hg-CTS）新型高效吸附剂，通过FT-IR、XRD、XPS、SEM等技术对吸附剂的物化特性和微观结构进行分析，对所制备的Hg-CTS吸附剂投加量、溶液初始pH、吸附时间对硫酸废水中Cl^-吸附效果的影响进行研究。实验结果表明，Cl^-初始质量浓度为1 000 mg/L，Hg-CTS投加量为0.8 g/L，反应时间为20 min，pH为3的最优条件下，Cl^-的去除率达到94%，吸附容量为117.42 mg/g。同时，Hg-CTS吸附剂对Cl^-吸附动力学符合拟二级动力学模型。

关键词: 壳聚糖, 硫酸废水, 除氯, 吸附

CLC Number: 

• X703.1

• TQ424