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当前位置: 首页 > 文章 > 动态条件下壳聚糖稳定纳米铁去除水体中Cr(Ⅵ)的研究 农业环境科学学报 2012,31 (03) 159-163
Position: Home > Articles > Removal of Hexavalent Chromium from Water by Chitosan-stabilized Nanoscale Zero-valent Iron Under Flow Conditions Journal of Agro-Environment Science 2012,31 (03) 159-163

动态条件下壳聚糖稳定纳米铁去除水体中Cr(Ⅵ)的研究

作  者：
耿兵;金朝晖;邓春生;张燕荣;王妮珊
单  位：
中国农业科学院农业环境与可持续发展研究所;南开大学环境科学与工程学院
关键词：
壳聚糖;纳米铁;六价铬Cr(Ⅵ)
摘  要：
以重金属Cr(Ⅵ)为目标污染物,在两种实验条件下(实验柱Ⅰ为模拟污染水样,实验柱Ⅱ为实际污染水样)考察了壳聚糖稳定纳米铁对Cr(Ⅵ)的去除能力。实验柱Ⅰ和实验柱Ⅱ分别在第160PV和127PV时发生了击穿效应。与实验柱Ⅰ相比,实验柱Ⅱ中壳聚糖稳定纳米铁对Cr(Ⅵ)的去除能力降低了25%。SEM表征显示,实验柱Ⅱ中壳聚糖稳定纳米铁的表面形成了许多葡萄状晶体,它们的存在导致实验柱Ⅱ中纳米铁的去除能力明显低于实验柱Ⅰ。XPS表征显示,由于Ca和Mg的氢氧化物替代了部分铁氢氧化物,导致实验柱Ⅱ中壳聚糖稳定纳米铁表面Fe原子的相对含量低于实验柱I。Cr元素高分辨率XPS能谱分析显示,在实验柱Ⅰ的条件下Cr(Ⅵ)被还原得更充分,而且在两种实验条件下都有部分Cr(Ⅵ)被吸附在纳米铁表面最终没有被零价铁所还原。
译  名：
Removal of Hexavalent Chromium from Water by Chitosan-stabilized Nanoscale Zero-valent Iron Under Flow Conditions
作  者：
GENG Bing1,JIN Zhao-hui2,DENG Chun-sheng1,ZHANG Yan-rong1,WANG Ni-shan1(1.Institute of Environment and Sustainable Development in Agriculture,Chinese Academy of Agricultural Sciences,Beijing 100081,China;2.College of Environmental Science and Engineering,Nankai University,Key Laboratory of Pollution Processes and Environmental Criteria,Ministry of Education,Tianjin 300071,China)
关键词：
chitosan;nanoscale zero-valent iron;hexavalent chromium Cr(Ⅵ)
摘  要：
The capacity of chitosan-stabilized Fe0 nanoparticles(chitosan-Fe0) to remove Cr(Ⅵ) from water was examined with column experiment(column Ⅰ:stimulated Cr(Ⅵ) contaminated water,column Ⅱ:Cr(Ⅵ) contaminated surface water).In column Ⅰ and column Ⅱ,Cr(Ⅵ) attained its breakthrough after 160 pore volume(PV) and 127 PV,respectively.Compared with column Ⅰ,column Ⅱ decreased by 25% in the Cr(Ⅵ) removal capacity of chitosan-Fe0.According to the SEM micrographs,in the presence of calcium and magnesium hardness botryoidal clusters were observed on the chitosan-Fe0 from column Ⅱ which led to the decrease of Cr(Ⅵ) removal capacity for chitosan-Fe0.Characterizations with XPS revealed that the Fe atom ratio on chitosan-Fe0 in column Ⅰ was lower than that in column Ⅱ,due to the replacement of ferric oxyhydroxide by passivated precipitates containing calcium and magnesium.The results of high-resolution XPS demonstrated that Cr(Ⅵ) was easier to be reduced in column Ⅰ than in column Ⅱ and under both conditions a little proportion of Cr(Ⅵ) was adsorbed on the chitosan-Fe0 surface which was not reduced by zero-valent iron at the end of experiment.

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