Kinetics of selenite reduction by zero-valent iron
Kinetics of selenite reduction by zero-valent iron
复制标题
零价铁还原亚硒酸盐的动力学
DOI：
10.1080/19443994.2013.862868
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发表时间：
2015-02
影响因子：
1.1
通讯作者：
Li, Lina
中科院分区：
文献类型：
--
作者：
Yang, Wenjun;Huang, Yuying;Guan, Xiaohong;Li, Lina
零价铁（ZVI）是一种廉价的试剂，可以去除许多常见的环境污染物。系统研究了溶解氧（DO）、pH、Se（IV）初始浓度、ZVI投加量、粒径以及反应温度对ZVI去除Se（IV）的影响。硒（IV）的去除ZVI更有利于在好氧条件下具有更高的反应速率比缺氧条件下，归因于促进ZVI腐蚀速率在DO的存在下。此外，硒（IV）的ZVI去除增强与ZVI剂量和反应温度，但随着pH值和ZVI粒径的增加而下降。当Se（IV）初始浓度为9.9 ~ 78.6mg L-1时，ZVI对Se（IV）的去除率先增加后降低。为了进一步描述反应速率，一个伪？采用一级反应动力学，通过拟合不同温度下的速率常数，求得反应活化能为32.86kJmol（-1）。在其他条件一定的情况下，准一级反应速率常数k（obs）与ZVI用量之间存在良好的线性关系。与文献报道的其他方法相比，ZVI还原法能够快速有效地去除沃茨中的Se（IV），是一种很有前途的方法。
Zero-valent iron (ZVI) is an inexpensive agent that can remove many common environmental contaminants. The effects of dissolved oxygen (DO), pH, initial selenite concentration (Se(IV)), ZVI dosage and particle size as well as reaction temperature on Se(IV) removal by ZVI were systematically investigated in this study. Se(IV) removal by ZVI was more favored under oxic conditions with higher reaction rate than under anoxic conditions, ascribing to the promoted ZVI corrosion rate in the presence of DO. Moreover, Se(IV) removal by ZVI was enhanced with increasing ZVI dosage and reaction temperature but decreased with increasing pH and ZVI particle size. The removal rate of Se(IV) by ZVI experienced an increase and then a decrease with initial Se(IV) concentration ranging from 9.9 to 78.6mg L-1. To further describe the reaction rate, a pseudo-?rst-order kinetics was employed, and the calculated activation energy, by fitting the rate constants at different temperatures, was determined to be 32.86kJmol(-1). When fixing other conditions, good linear correlation could be observed between pseudo-first-order reaction rate constants (k(obs)) and ZVI dosage. Compared with other methods for Se(IV) removal reported in literatures, reduction by ZVI was considered a promising technique, which could rapidly and effectively eliminate Se(IV) from waters.
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影响因子：
6
作者：
Masami Kashiwa;M. Ike;H. Mihara;N. Esaki;M. Fujita
通讯作者：
Masami Kashiwa;M. Ike;H. Mihara;N. Esaki;M. Fujita
影响因子：
9.9
作者：
Duc, M.;Lefevre, G.;Fedoroff, M.
通讯作者：
Fedoroff, M.
pH 对黄铁矿还原水相 Se(IV) 的影响
影响因子：
11.4
作者：
Kang, Mingliang;Chen, Fanrong;Charlet, L.
通讯作者：
Charlet, L.
影响因子：
3.8
作者：
Karri, S;Sierra-Alvarez, R;Field, JA
通讯作者：
Field, JA
影响因子：
2.6
作者：
W. Hunter;L. Kuykendall
通讯作者：
W. Hunter;L. Kuykendall