不同种类纳米零价铁的毒性比较研究

现代地质 ›› 2012, Vol. 26 ›› Issue (5): 926-931.

不同种类纳米零价铁的毒性比较研究

王菁姣, 陈家玮

中国地质大学地球科学与资源学院，北京100083

收稿日期:2012-04-25 修回日期:2012-08-29 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，从事地球化学研究和教学工作。 Email: chenjiawei@cugb.edu.cn。
作者简介:王菁姣，女，本科生， 1988年出生，地质学基地班，主要从事环境地球化学方面研究工作。 Email:ztsangel@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”(2009ZX07424-002)。

Comparison Study on Toxicity of Different Nanoscale Zero valent Iron

WANG Jing-Jiao, Chen-Jia-Wei

School of Earth Sciences and Resources, China University of Geosciences, Beijing100083，China

Received:2012-04-25 Revised:2012-08-29 Online:2012-10-19 Published:2012-10-23

摘要/Abstract

摘要：

纳米零价铁是一种高效的环境修复材料，可以处理多种污染物；然而，纳米粒子的尺寸效应可能导致其在自然界中存在潜在毒性风险。选择几种常用包覆型、负载型和裸露的纳米铁，通过大肠杆菌的耐受性实验，比较3种纳米铁的毒性。研究表明，负载型纳米铁的分散性最好，而裸露纳米铁最差。3种纳米铁虽然对大肠杆菌都表现出毒性，但是负载型纳米铁的毒性最小。通过毒性减缓的机理分析，说明纳米铁改性后阻止了纳米颗粒与细菌的直接接触，这是空间位阻效应的作用。研究结果进一步证实了在使用纳米材料前应充分评估潜在毒性和环境效应的重要性。

关键词: 纳米零价铁, 大肠杆菌, 毒性, 分散性

Abstract:

Nanoscale zero valent iron (nZVI) particle is a kind of efficient materials for remediation of many pollutants in the environment; however, the potential toxicity of nano particles might be a risk to small size effects. We investigated the toxicity of nZVI toward gram negative Escherichia coli, using coated nZVI supported nZVI and bare nZVI, which are widely used for in situ remediation.Supported nZVI showed the best dispersion performance while bare nZVI the worst. All the three materials showed toxic to Escherichia coli and supported nZVIs toxicity was obviously mitigated.It indicates that the modified nZVI has a physical barrier hindering direct contact between nZVI and bacteria, which is related to electrosteric repulsion.This research emphasizes that the potential risk assessment of nanomaterials are very important before their use.

Key words: nanoscale zerovalent iron, Escherichia coli, toxicity, dispersion

王菁姣, 陈家玮. 不同种类纳米零价铁的毒性比较研究[J]. 现代地质, 2012, 26(5): 926-931.

WANG Jing-Jiao, Chen-Jia-Wei. Comparison Study on Toxicity of Different Nanoscale Zero valent Iron[J]. Geoscience, 2012, 26(5): 926-931.

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