| 引用本文: | 梁丽萍,杨文君,关小红.纳米零价铁去除地下水中亚硒酸盐的动力学及机理[J].哈尔滨工业大学学报,2014,46(6):20.DOI:10.11918/j.issn.0367-6234.2014.06.004 |
| LIANG Liping,YANG Wenjun,GUAN Xiaohong.Reductive removal of Se(IV) by nanoscale zero-valent iron under anoxic conditions: kinetics and mechanism[J].Journal of Harbin Institute of Technology,2014,46(6):20.DOI:10.11918/j.issn.0367-6234.2014.06.004 |
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| 摘要: |
| 为解决地下水中亚硒酸盐(Se(IV))污染问题,采用纳米零价铁为还原剂,考察溶液的pH、Se(IV)初始浓度以及溶液温度等因素对Se(IV)去除效果的影响．结果表明:纳米零价铁在厌氧条件下能够在短时间内将Se(IV)完全去除,速率常数随pH和初始硒浓度的升高而降低,随温度的升高而升高,利用阿伦尼乌斯方程得到其反应活化能为26.26 kJ·mol-1．X射线吸收近边结构谱(XANES)进一步证明了在不同pH和浓度下,还原产物以Se(0)为主．水中Se(IV)的去除由吸附和还原引起,反应过程是水中Se(IV)先吸附到纳米铁表面,随后被还原为零价硒．纳米零价铁还原是一种有效去除水体中Se(IV)的方法． |
| 关键词: 纳米零价铁 Se(IV) 动力学 地下水 |
| DOI：10.11918/j.issn.0367-6234.2014.06.004 |
| 分类号:X52 |
| 基金项目:国家自然科学基金资助项目(21277095);同济大学中央高校基本科研业务费专项资金项目(0400219206). |
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| Reductive removal of Se(IV) by nanoscale zero-valent iron under anoxic conditions: kinetics and mechanism |
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LIANG Liping1, YANG Wenjun2, GUAN Xiaohong1
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(1. State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, 150090 Harbin, China; 2. School of Environmental ＆ Safety Engineering, Changzhou University, 213000 Changzhou, Jiangsu, China)
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| Abstract: |
| Nano-zero valent iron (NZVI) was employed to remove Se(IV) from groundwater. The kinetics of Se(IV) removal by NZVI as functions of pH, initial selenite concentration and reaction temperature were investigated and the reaction products of Se(IV) with NZVI were determined with X-ray Absorption Near Edge Structure Spectroscopy (XANES). The results demonstrated that the Se(IV) could be rapidly removed by NZVI with pseudo first order reaction rate constants decreasing from 0.339 to 0.149 min-1 as pH increased from 4.0 to 7.0. Moreover, the removal rates of Se(IV) by NZVI at pH 6.0 dropped with elevating initial Se(IV) concentration. The activation energy of Se(IV) removal by NZVI was determined to be 26.26 kJ·mol-1. The XANES analysis unraveled that Se(IV) was removed by NZVI via adsorption followed by reduction to Se(0). |
| Key words: nano zero valent iron selenite kinetics groundwater |
