零价铁去除水中Cu(Ⅱ)的研究

doi:10.16085/j.issn.1000-6613.2016.02.045

化工进展 ›› 2016, Vol. 35 ›› Issue (02): 629-634.DOI: 10.16085/j.issn.1000-6613.2016.02.045

零价铁去除水中Cu(Ⅱ)的研究

付欣¹, 吉娜², 陈群³, 李筱琴¹

1 华南理工大学环境与能源学院, 广东广州 510006;
2 广州市水务工程建设管理中心, 广东广州510640;
3 广东省建筑科学研究院, 广东广州 510500

收稿日期:2015-08-05 修回日期:2015-09-19 出版日期:2016-02-05 发布日期:2016-02-05
通讯作者: 李筱琴,副教授,主要研究方向为重金属及有机污染土壤和水体的纳米修复技术。E-mail:xqli306@scut.edu.cn。
作者简介:付欣(1990-),女,硕士研究生,主要从事零价铁处理重金属的研究。
基金资助:
国家自然科学基金青年基金项目(41103050)及国家自然科学基金面上项目(41173104)。

A study on the removal of Cu(Ⅱ) by zero-valent iron

FU Xin¹, JI Na², CHEN Qun³, LI Xiaoqin¹

1 College of Environment and Energy, South China University of Technology, Guangzhou 510006, Guangdong, China;
2 Guangzhou Water Engineering Construction Management Center, Guangzhou 510640, Guangdong, China;
3 Guangdong Provincial Academy of Building Research, Guangzhou 510500, Guangdong, China

Received:2015-08-05 Revised:2015-09-19 Online:2016-02-05 Published:2016-02-05

摘要/Abstract

摘要： 重金属污染是我国河道中普遍关注的环境问题。本文以石井河为对象,采用批实验和柱实验模拟铁屑和铁粉两种零价铁去除水中Cu(Ⅱ)。XRD和XPS表征结果表明:铁屑和铁粉具有核壳结构,核为Fe(110)型Fe⁰,反应前壳为以Fe(Ⅱ)为主的铁氧化物。反应过程中,Cu(Ⅱ)主要被还原并固定在零价铁颗粒表面,Fe⁰不断氧化生成Fe₃O₄。批实验表明,两种零价铁都能较快速地去除水中的Cu(Ⅱ)。零价铁去除Cu(Ⅱ)符合准一级动力学方程,去除率和反应速率k_obs随着铁屑或铁粉投加量的增加而上升,随着Cu(Ⅱ)初始浓度的增加而降低。当Cu(Ⅱ)初始浓度为45mg/L、零价铁投加量为10g/L时,3h之后铁粉对Cu(Ⅱ)去除率几乎达到100%,而铁屑的去除率为75%,其表观反应速率k_obs分别为1.07h^-1和0.59h^-1。柱实验结果表明,铁屑和铁粉对Cu(Ⅱ)具有较高的去除容量,分别为75.67mg/g和78.60mg/g,铁粉对Cu(Ⅱ)的处理效果略优于铁屑。

关键词: 零价铁, 铜离子, 柱实验, 反应动力学, 污染, 固定化

Abstract: Heavy metal pollution in water environment is one of the common concerns in China. Since zero-valent iron has great advantages on heavy metal removal,iron filing and iron powder were applied to Cu(Ⅱ) in Cu(Ⅱ) spiked Shijing River water. XRD and XPS results indicate that both iron filing and iron powder have a core-shell structure with Fe(110) as the core and Fe(Ⅱ) oxides as the shell. During the reaction process,the iron particles were oxidized progressively and formed Fe₃O₄ at the surface. Batch experimental results showed that both iron filling and iron powder can quickly remove Cu(Ⅱ) from water and the reactions follow pseudo-first-order reaction kinetics. The removal rate and the reaction rate constant k_obs increased with the increase of iron dosage,and decreased with the increase of initial concentration of Cu(Ⅱ). At Cu(Ⅱ) initial concentration of 45mg/L and zero-valent iron dosage of 10g/L,Cu(Ⅱ) was completely removed by iron powder after 3h,while the removal rate was only 75% for iron filling. k_obs are 1.07h^-1 and 0.59h^-1,respectively. Column tests showed that iron filing and iron powder have high removal capacity for Cu(Ⅱ),which were 75.67mg/g and 78.60mg/g, respectively. Overall,iron powder shows higher removal capacity and efficiency than that of iron filling.

Key words: zero-valent iron, copper ion, column test, reaction kinetics, pollution, immobilization

中图分类号:

X522

付欣, 吉娜, 陈群, 李筱琴. 零价铁去除水中Cu(Ⅱ)的研究[J]. 化工进展, 2016, 35(02): 629-634.

FU Xin, JI Na, CHEN Qun, LI Xiaoqin. A study on the removal of Cu(Ⅱ) by zero-valent iron[J]. Chemical Industry and Engineering Progree, 2016, 35(02): 629-634.

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零价铁去除水中Cu(Ⅱ)的研究

A study on the removal of Cu(Ⅱ) by zero-valent iron

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