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浙江大学学报(工学版)
浙江大学学报(工学版)
环境工程     
天然斜发沸石吸附铅(Pb2+)机理
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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摘要：

为了探讨沸石对Pb2+的吸附过程以及不同阶段的主导吸附机制,设计铅离子脱附实验.将沸石分别置于高质量浓度和低质量浓度的铅溶液中,并将不同吸附程度的沸石取样后进行NaCl和HNO3脱附实验.实验发现:天然斜发沸石对Pb2+的吸附机理主要包括离子交换和物理吸附,其中物理吸附占主导作用.离子交换主要发生在沸石外表面,在短时间内达到平衡,其交换量几乎不受铅溶液初始质量浓度的影响,并且低质量浓度铅溶液中的离子交换所占百分比更高.在低质量浓度的铅溶液中,物理吸附主要发生在沸石外表面,达到平衡所需时间较短；在高质量浓度铅溶液中,物理吸附达到平衡所需时间较长,所占百分比更高.此外,部分铅离子与沸石结合比较紧密,无法脱附出来.
Abstract:

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  
基金资助:

国家水体污染控制与治理科技重大专项资助项目(2011ZX07301-004-03-02)；浙江省饮用水安全保障与城市水环境治理重点科技创新团队资助项目（2010R50037）
通讯作者: 周永潮,男,副教授     E-mail: zhoutang@zju.edu.cn
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: shaowy@zju.edu.cn
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引用本文:

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.

链接本文:

http://www.zjujournals.com/eng/CN/10.3785/j.issn.1008-973X.2015.06.024    或    http://www.zjujournals.com/eng/CN/Y2015/V49/I6/1173

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