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现代地质 ›› 2012, Vol. 26 ›› Issue (5): 932-938.

• 地球化学 • 上一篇    下一篇

膨润土负载纳米铁去除地下水中六价铬研究

 李晨桦, 陈家玮   

  1. 中国地质大学 地球科学与资源学院，北京100083
  • 收稿日期:2012-04-20 修回日期:2012-07-07 出版日期:2012-10-19 发布日期:2012-10-23
  • 通讯作者: 陈家玮， 男，教授，博士，1974年出生，地球化学专业，主要从事地球化学研究和教学工作。 Email：chenjiawei@cugb.edu.cn。
  • 作者简介:李晨桦，女，硕士研究生，1990年出生，地质工程专业，主要从事应用地球化学方面的研究。 Email：lchcugb@163。com。
  • 基金资助:

    中国地质调查局项目(1212011120288)；中央高校基本科研业务费专项资金项目(2012123, 2010ZD14)；国家科技重大专项“水体污染控制与治理科技重大专项”(2009ZX07424-002)。

A Study on Bentonite supported Nano Iron for Removal of Cr (Ⅵ) in Groundwater

 LI  Chen-Hua, CHEN  Jia-Wei   

  1. School of  Earth Sciences and Resources, China University of Geosciences, Beijing100083，China
  • Received:2012-04-20 Revised:2012-07-07 Online:2012-10-19 Published:2012-10-23

PDF (PC)

1118

被引次数

69

摘要：

随着人民生活水平的提高和城市化进程的加快，有机污染物及重金属高强度场地污染对人类健康、生态环境及社会安全构成了严重威胁。地下水中的重金属Cr(Ⅵ)污染逐渐受到重视，纳米零价铁可以有效地将六价铬还原成三价铬，使其沉淀固定下来，从而将污染源区的污染物消减固定，防止其向周围扩散。然而由于纳米铁颗粒微小，易被氧化，极易团聚，自身活性受到限制，因此，纳米铁的分散性、稳定性、良好活性研究至关重要。采用低成本环境友好型粘土矿膨润土作为负载材料制备膨润土负载纳米铁（B-NZVI），批实验和柱实验研究BNZVI去除模拟地下水中Cr(Ⅵ)。结果表明：(1)自制的膨润土负载纳米铁个体呈球形，呈分散状负载于膨润土；(2)相同铁含量的B-NZVI处理Cr(Ⅵ)的效率远大于纳米铁，还原反应符合伪一级反应动力学模型，表观速率常数K随着BNZVI初始浓度的减小而减小；(3)BNZVI在石英砂柱中基本无迁移，适用于点源污染，Cr(Ⅵ)穿透曲线为B-NZVI的实际应用提供了理论和实验基础。

关键词: 膨润土, 纳米铁, 六价铬, 批实验, 柱实验

Abstract:

With the development of living standard and urbanization, groundwater pollution is becoming serious. It is hazardous to human health, ecotope and social security with the heavy metal and organic field pollutants. The issues of Cr(Ⅵ) contaminated groundwater are paid more attention on recently. As Cr(Ⅵ) has high toxicity and mobility in water compared to Cr(Ⅲ), it is very important to deposit chromium by reduction of Cr(Ⅵ) into Cr(Ⅲ) using nano iron; therefore, the contaminants in source region are stabilized and indiffused from all around. While the agglomeration and oxidation of nano iron is often unavoidable due to the very small particles, it is essential to study the disperse and stability of nano iron. In this paper, bentonite was used as a porous based support material for synthesized nano iron. The results showed as follows. (1) Bentonite supported nano iron particles are well sphere scattering on the bentonite. (2) The removal efficiency of B-NZVI is better than NZVI comparing the same iron content (1 g/L) B-NZVI, NZVI and 1 g/L bentonite. Reduction kinetics of Cr(VI) by B-NZVI were described by a pseudo first order reaction. Kinetics studies of Cr(Ⅵ) reduction using B-NZVI suggested that the reactivity of NZVI particles supported on bentonite were decreased significantly with the decrease of initial iron content. (3) Column experiments showed that B-NZVI was no migratory in the column packed silicon dioxide and it indicated B-NZVI is suitably applied in point source pollution. Breakthrough curve of Cr(Ⅵ) in the column was obtained for reference to application.

Key words: bentonite；nanoiron；Cr(VI)；batch experiment, column experiment

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