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邵卫云, 易文涛, 周永潮, 张萍
浙江大学 建筑工程学院 浙江省饮用水安全与输配技术重点实验室,浙江 杭州 310058
Mechanism of lead (Pb2+) adsorption on natural clinoptilolite
SHAO Wei-yun, YI Wen-tao, ZHOU Yong-chao, ZHANG Ping
Zhejiang Key Laboratory of Drinking Water Safety and Distribution Technology, College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, China
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Desorption experiment of lead (Pb2+) was designed to investigate the process and leading mechanism in different stages of lead adsorption on natural clinoptilolite. Clinoptilolite samples were put into lead solutions of high and low initial mass concentrations. NaCl and HNO3 were applied for desorption test on clinoptilolite samples of different sorption stages. It is found that Pb2+ is absorbed by clinoptilolite by two main mechanisms: ion exchange and physisorption, and physisorption plays a leading role in absorption process. Ion exchange occurs mainly on the surface of clinoptilolite and reaches equilibrium in short time. Ion exchange capacity is hardly influenced by the initial mass concentration of lead solution. Moreover, the percentage of ion exchange is higher in lead solution of low initial mass concentration. On the other hand, physisorption process occurs mostly on the surface of clinoptilolite in lead solution of low mass concentration and reaches equilibrium quickly. While, the proportion of Pb2+ absorbed by physisorption in the lead solution of high mass concentration is higher, which costs a long time to reach equilibrium. In addition, a fraction of Pb2+ cannot be desorbed due to its strong bonds with clinoptilolite.

出版日期: 2015-06-01
:  X 703.5  


通讯作者: 周永潮,男,副教授     E-mail:
作者简介: 邵卫云(1970—),女,副教授,博士,从事水动力学、城市排水与水环境研究.E-mail:
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邵卫云, 易文涛, 周永潮, 张萍. 天然斜发沸石吸附铅(Pb2+)机理[J]. 浙江大学学报(工学版), 10.3785/j.issn.1008-973X.2015.06.024.

SHAO Wei-yun, YI Wen-tao, ZHOU Yong-chao, ZHANG Ping. Mechanism of lead (Pb2+) adsorption on natural clinoptilolite. JOURNAL OF ZHEJIANG UNIVERSITY (ENGINEERING SCIENCE), 10.3785/j.issn.1008-973X.2015.06.024.


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