钙化好氧颗粒污泥对Pb2＋、Cu2＋、Cd2＋的吸附  

Adsorption of Pb^(2+),Cu^(2+),Cd^(2+) by calcified aerobic granular sludge

作　　者：李姝[1] 胡学伟[1] Nguyen Dinh Trung 莫文锐 宁平[1] 李媛[1] 

机构地区：[1]昆明理工大学环境科学与工程学院,昆明650500 [2]德宏州环境监测站,芒市678400

出　　处：《环境化学》2013年第10期1917-1923,共7页Environmental Chemistry

基　　金：国家自然科学基金(50908109,51178208,51368024);昆明理工大学分析测试基金(2011302);云南省教育厅重点项目(2013Z123)资助

摘　　要：好氧颗粒污泥经钙化处理后用来对水中的Pb2+、Cu2+、Cd2+进行吸附实验.对比了不同pH、吸附时间等对吸附性能及吸附行为的影响.结果表明,钙化好氧颗粒污泥对重金属吸附最佳pH值为5.0,20 min即可达吸附平衡,吸附过程符合Langmuir等温方程和Freundlich等温方程;单一吸附体系中,吸附量依次为Cd2+>Cu2+>Pb2+,而在共存体系中规律则相反;分别以CaCl2、HNO3和HCl为解吸剂,其解吸效率均可达95%以上;羧基、胺基为吸附的主要官能团,磷酸基团处次要地位.Aerobic granular sludge was used for adsorption test of Pb2＋ , Cu2＋ and Cd2＋ after adding Ca（ OH）2 and drying. The influence of pH, adsorption time and initial heavy metal concentration was investigated, and the adsorption models were analyzed. The results showed when the pH was 5, the sludge had the highest adsorption efficiency. After 20 min, the adsorption process reached equilibrium, and the accumulation of the three metal ions fitted Langmuir and Freundlich adsorption isotherms. In single-metal adsorption system, the adsorption capacity of Pb2＋ ,Cu2＋ ,Cd2＋ followed the order of Cd2＋ 〉 Cu2＋ 〉 Pb2＋ However, in coexisting system, the order was the opposite. The sludge was regenerated by CaCl2, HNO3 and HC1 with over 95% recovery rate. Moreover, the Fourier transform infrared spectroscopy （FFIR） results demonstrated that amido and carboxyl groups contributed largely to the sorption of Pb2＋ , Cu2＋ , Cd2＋ , and phosphate groups also played a minor role.

关 键 词：好氧颗粒污泥 重金属 吸附 共存体系 

分 类 号：X703[环境科学与工程—环境工程]