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(B-NZVI)/CTMAB的制备及对水中铬(Ⅵ) 的去除性能与机理

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彭秀达, 刘红, 周亚端, 秦雄, 冯涛. (B-NZVI)/CTMAB的制备及对水中铬(Ⅵ) 的去除性能与机理[J]. 环境工程学报, 2014, 8(10): 4115-4121.
引用本文: 彭秀达, 刘红, 周亚端, 秦雄, 冯涛. (B-NZVI)/CTMAB的制备及对水中铬(Ⅵ) 的去除性能与机理[J]. 环境工程学报, 2014, 8(10): 4115-4121.
shu
Peng Xiuda, Liu Hong, Zhou Yaduan, Qin Xiong, Feng Tao. Preparation of (B-NZVI)/CTMAB and its removal effect on Cr(Ⅵ) in water[J]. Chinese Journal of Environmental Engineering, 2014, 8(10): 4115-4121.
Citation: Peng Xiuda, Liu Hong, Zhou Yaduan, Qin Xiong, Feng Tao. Preparation of (B-NZVI)/CTMAB and its removal effect on Cr(Ⅵ) in water[J]. Chinese Journal of Environmental Engineering, 2014, 8(10): 4115-4121.
shu

(B-NZVI)/CTMAB的制备及对水中铬(Ⅵ) 的去除性能与机理

  • 1.

    武汉科技大学资源与环境工程学院, 武汉 430081

  • 基金项目:

    国家自然科学基金资助项目（50904047）

  • 中图分类号: X703

Preparation of (B-NZVI)/CTMAB and its removal effect on Cr(Ⅵ) in water

  • 1.

    School of Resource and Environmental Engineering, Wuhan University of Science and Technology, Wuhan 430081, China

  • Fund Project:

  • 摘要: 采用液相还原法制备膨润土负载纳米铁（B-NZVI），并用十六烷基三甲基溴化铵（CTMAB）对其进行表面改性，研究了不同n（FeSO4）/n（NaBH4）（记为N）制备的（B-NZVI）/CTMAB的除铬效果。结果表明，N=1时制备的（B-NZVI）/CTMAB除Cr（Ⅵ）效率最高，较未改性的膨润土负载纳米铁（B-NZVI）的除Cr（Ⅵ）效率（57.7%）提高了23.7%，反应速率提高1.31倍。X射线衍射发现，N=1时不仅有零价铁，还有Fe（Ⅱ），对加快反应速率和提升去除效果有一定作用。从反应后产物的光电子能谱（XPS）图看出Cr（Ⅵ）被吸附后大部分还原为Cr（Ⅲ），而铁被氧化为Fe（Ⅲ）。最后，结合反应前后材料的表面电性以及扫描电镜图，对（B-NZVI）/CTMAB改性机制、改性后纳米零价铁线的形成及去除Cr（Ⅵ）的机理和产物等进行了探究。
    Abstract: Zero-valent nanoscale iron supported on bentonite (B-NZVI) was prepared through liquid phase reduction method,followed by the modifying with cetyl-trimethyl ammonium bromide (CTMAB).The removal of Cr(Ⅵ) by (B-NZVI)/CTMAB prepared with different molar ratios of FeSO4 to NaBH4 (represent by N) was investigated and the highest removal rate was achieved by (B-NZVI)/CTMAB with N=1.Compared with B-NZVI,there was a 23.7% increase of efficiency (from 57.7% to 81.4%) and a more than double constant of reaction rate,respectively.The analysis of XRD indicated that there existed not only Fe0 but also Fe(Ⅱ) in (B-NZVI)/CTMAB and the latter improved the reaction rate and removal efficiency.X-ray photoelectron spectroscopy of the products showed that most of Cr(Ⅵ) absorbed was changed into Cr(Ⅲ) and Fe was oxidized to Fe(Ⅲ) accordingly.Finally,the mechanism of the modification,the formation of nano-iron wire,and the removal of Cr(Ⅵ) were explored by the analysis of SEM images and the surface properties of the materials.
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  • 收稿日期:  2013-10-17
  • 刊出日期:  2014-09-28
彭秀达, 刘红, 周亚端, 秦雄, 冯涛. (B-NZVI)/CTMAB的制备及对水中铬(Ⅵ) 的去除性能与机理[J]. 环境工程学报, 2014, 8(10): 4115-4121.
引用本文: 彭秀达, 刘红, 周亚端, 秦雄, 冯涛. (B-NZVI)/CTMAB的制备及对水中铬(Ⅵ) 的去除性能与机理[J]. 环境工程学报, 2014, 8(10): 4115-4121.
shu
Peng Xiuda, Liu Hong, Zhou Yaduan, Qin Xiong, Feng Tao. Preparation of (B-NZVI)/CTMAB and its removal effect on Cr(Ⅵ) in water[J]. Chinese Journal of Environmental Engineering, 2014, 8(10): 4115-4121.
Citation: Peng Xiuda, Liu Hong, Zhou Yaduan, Qin Xiong, Feng Tao. Preparation of (B-NZVI)/CTMAB and its removal effect on Cr(Ⅵ) in water[J]. Chinese Journal of Environmental Engineering, 2014, 8(10): 4115-4121.
shu

(B-NZVI)/CTMAB的制备及对水中铬(Ⅵ) 的去除性能与机理

  • 1. 武汉科技大学资源与环境工程学院, 武汉 430081
  • 收稿日期:  2013-10-17
基金项目:

国家自然科学基金资助项目（50904047）

摘要: 采用液相还原法制备膨润土负载纳米铁（B-NZVI），并用十六烷基三甲基溴化铵（CTMAB）对其进行表面改性，研究了不同n（FeSO4）/n（NaBH4）（记为N）制备的（B-NZVI）/CTMAB的除铬效果。结果表明，N=1时制备的（B-NZVI）/CTMAB除Cr（Ⅵ）效率最高，较未改性的膨润土负载纳米铁（B-NZVI）的除Cr（Ⅵ）效率（57.7%）提高了23.7%，反应速率提高1.31倍。X射线衍射发现，N=1时不仅有零价铁，还有Fe（Ⅱ），对加快反应速率和提升去除效果有一定作用。从反应后产物的光电子能谱（XPS）图看出Cr（Ⅵ）被吸附后大部分还原为Cr（Ⅲ），而铁被氧化为Fe（Ⅲ）。最后，结合反应前后材料的表面电性以及扫描电镜图，对（B-NZVI）/CTMAB改性机制、改性后纳米零价铁线的形成及去除Cr（Ⅵ）的机理和产物等进行了探究。

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