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| 纳滤膜在地下水除氟中对Cl^-／F^-的选择性分离 | |
| 引用本文： | 王晓伟,刘文君,李德生,马伟芳.纳滤膜在地下水除氟中对Cl^-／F^-的选择性分离[J].环境科学与管理,2010,35(9):51-54. |
| 作者姓名： | 王晓伟 刘文君 李德生 马伟芳 |
| 作者单位： | 1. 兰州交通大学环境与市政工程学院,甘肃,兰州,730070 2. 清华大学,环境科学与工程系,北京,100084 3. 北京交通大学,土木建筑学院,北京,100044 |
| 摘 要： | 荷负电型纳滤（NF）膜在地下饮用水除氟中，对离子F^-的截留率（65％-78％）要高于对离子Cl^-的截留率，且表现出较好的Cl^-／F^-的选择性（离子选择性系数S〉1．5）和Donnan排斥作用。当水溶液中离子F^-和Cl^-单独存在时，随原水F^-浓度增加，NF膜对F^-的截留率由64．3％增至73．0％，当原水F^-浓度小于3．3mg／L时，NF膜出水F^-浓度小于1．0mg／L；而随Cr浓度增加，NF膜对Cl^-截留率由44．7％减小至20％以下。当F^-和Cr共存时，受F^-浓度增加的影响，NF膜Cl^-的截留率逐渐减小；受Cl^-浓度增加的影响，NF膜F^-截留率同样表现出减小的趋势。由S值随r浓度的增加而增大，可知NF在地下水除氟中F^-与Cl^-之间存在明显的竞争关系。 |
| 关 键 词： | 纳滤膜 离子截留率 离子选择性系数 Dorman排斥 |
Selective Removal of Cl~-/F~- by Nanofiltration Membrane Application to the Defluorination of Groundwater |
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| Wang Xiaowei,Liu Wenjun,Li Desheng,Ma Weifang.Selective Removal of Cl~-/F~- by Nanofiltration Membrane Application to the Defluorination of Groundwater[J].Environmental Science and Management,2010,35(9):51-54. | |
| Authors: | Wang Xiaowei Liu Wenjun Li Desheng Ma Weifang |
| Institution: | Wang Xiaowei1,2,Liu Wenjun2,Li Desheng3,Ma Weifang1(1.School of Environmental , Municipal Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China,2.Department of Environmental Science , Engineering,Tsinghua University,Beijing 100084,3.School of Environmental , Energy Engineering,Beijing University of Civil Engineering , Architecture,Beijing 100044,China) |
| Abstract: | The negatively charged nanofiltration membrane was applied for fluoride removal. The experimental results showed that, the F^- rejection rate （65 % - 78 % ） was higher than that of Cl^- with NF membrane, and the Cl^-/F^- selectivity was relatively good （S 〉 1.5 ）, so there existed the Donnan exclusion. Present alone, F^- rejection rate increased with increase of the F^-concentrations but Cl^-was just the opposite ;when the F^-concentrations in feed were less than 3.3 mg/L, the F^-concentrations in permeate were less than 1.0 mg/L. Coexistence, the Cl^- rejection rate gradually decreased with increase of the F^- concentrations ;the F^- rejection rate being affected by Cl^- also presented the negative effects. S values increased gradually with the increase of F^- concentrations, and therefore the competition relationship existed between F^-and Cl^-. |
| Keywords: | nanofiltration rejection rate ions selectivity coefficient Donnan exclusion |
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