【引用本文】 邓日欣, 罗伟嘉, 韩奕彤, 等. 膨润土负载纳米铁镍同步修复地下水中三氯乙烯和六价铬复合污染[J]. 岩矿测试, 2018, 37(5): 541-548. doi: 10.15898/j.cnki.11-2131/td.201801280013
DENG Ri-xin , LUO Wei-jia , HAN Yi-tong , et al. Simultaneous Removal of TCE and Cr(Ⅵ) in Groundwater by Using Bentonite-supported Nanoscale Fe/Ni[J]. Rock and Mineral Analysis, 2018, 37(5): 541-548. doi: 10.15898/j.cnki.11-2131/td.201801280013

膨润土负载纳米铁镍同步修复地下水中三氯乙烯和六价铬复合污染

1. 生物地质与环境地质国家重点实验室, 北京 100083;

2. 中国地质大学(北京)地球科学与资源学院, 北京 100083;

3. 北京建筑大学环境与能源工程学院, 北京 102616

收稿日期: 2018-01-28  修回日期: 2018-04-02 

基金项目: 国家自然科学基金面上基金项目(41472232,41572229)

作者简介: 邓日欣,硕士研究生,从事环境地球化学研究。E-mail:drx@cugb.edu.cn。。

Simultaneous Removal of TCE and Cr(Ⅵ) in Groundwater by Using Bentonite-supported Nanoscale Fe/Ni

1. State Key Laboratory of Biogeology and Environmental Geology, Beijing 100083, China;

2. School of Earth Sciences and Resources, China University of Geosciences(Beijing), Beijing 100083, China;

3. School of Environment and Energy Engineering, Beijing University of Civil Engineer and Architecture, Beijing 102616, China

Received Date: 2018-01-28
Revised Date: 2018-04-02

摘要:纳米零价铁原位注射修复地下水污染是近年发展的新技术,以往研究多侧重单一目标污染物的去除效果及作用机理,但是地下水多种污染物共存问题不容忽视。针对典型污染物三氯乙烯TCE和六价铬Cr(Ⅵ),运用合成的活性高、稳定性强的膨润土负载纳米铁镍(B-Fe/Ni)开展修复实验,研究B-Fe/Ni对TCE和Cr(Ⅵ)共存复合污染的修复效果及其作用机制。通过一步法合成B-Fe/Ni,对TCE和不同浓度Cr(Ⅵ)混合污染的去除进行试验研究,对反应前后的样品B-Fe/Ni进行表征,并跟踪反应过程中TCE和Cr(Ⅵ)的浓度变化。结果表明:B-Fe/Ni同步去除水中TCE和Cr(Ⅵ)快速高效,50 mg/L Cr(Ⅵ)在2 h内能被B-Fe/Ni(1 g/L)完全去除而不受共存TCE(0.1 mmol/L)的影响,然而TCE降解速率会随共存Cr(Ⅵ)的浓度(0、10、30、50 mg/L)增大而降低。经透射电镜-电子能谱及X射线光电子能谱表征验证,这是由于B-Fe/Ni与Cr(Ⅵ)快速反应,生成部分Fe-Cr共沉淀会覆盖B-Fe/Ni表面的活性位点,抑制了TCE的降解,但通过分析TCE降解产物可知,B-Fe/Ni同样能对TCE完全脱氯。因此,B-Fe/Ni适用于地下水复合污染修复,实际应用时需考虑多种污染物共存的相互影响,选择适宜试剂用量和注射方式,这对纳米零价铁修复技术的发展具有重要理论意义和应用参考价值。

关键词: 膨润土负载纳米铁镍, 三氯乙烯, 六价铬, 地下水共存污染, 地下水环境修复

Simultaneous Removal of TCE and Cr(Ⅵ) in Groundwater by Using Bentonite-supported Nanoscale Fe/Ni

KEY WORDS: bentonite-supported nanoscale Fe/Ni bimetals, trichloroethylene, hexavalent chromium, coexisting pollutants in groundwater, groundwater remediation

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膨润土负载纳米铁镍同步修复地下水中三氯乙烯和六价铬复合污染

邓日欣, 罗伟嘉, 韩奕彤, 李志雄, 陈家玮