电活性微生物激活生物质炭/零价铁协同钝化Cr(Ⅵ)及机制
Reactivation of Passivated Biochar /Nanoscale Zero-Valent Iron by an Electroactive Microorganism for Cooperative Hexavalent Chromium Removal and Mechanisms
查看参考文献30篇
廖聪坚
1,2,3,4
赵晓蕾
2,5
刘凯
1,2,3,4
钟松雄
1,2,3,4
李芳柏
2,3
*
方利平
2,3
叶挺进
6
石虎砚
6
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文摘
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纳米零价铁(nZVI)具有对六价铬[Cr(Ⅵ) ]还原去除能力,但其存在易老化和易团聚的问题,会大大降低对Cr(Ⅵ)反应活性.本文将具有异化铁还原能力的MR-1引入到老化生物质炭负载纳米零价铁(nZVIB)除Cr(Ⅵ)的反应体系中.研究厌氧条件下老化后nZVI /B与MR-1之间对Cr(Ⅵ)去除存在的协同效应机制,以及反应体系中pH条件,初始Cr(Ⅵ)浓度和MR-1菌浓度对这种协同效应的影响.结果表明,在pH为7时体系有明显协同效应,去除率提高51.3%.并且该协同效应随初始Cr(Ⅵ)增加而减弱,随着MR-1浓度增加而增强.固相分析结果表明Cr(Ⅵ)主要以还原为Cr(Ⅲ)的形式被固定. MR-1的异化铁还原能力起到了重要的作用,通过零价铁表面铁氧化物老化层还原,为反应体系提供了大量还原性的Fe(Ⅱ),同时也释放了内部nZVI的反应活性位点,而生物质炭不仅分散了nZVI还介导MR-1的胞外电子传递过程,从而增强了体系对Cr(Ⅵ)协同钝化能力.本研究为有效解决nZVI长期使用过程中的老化问题提供了新思路. |
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其他语种文摘
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Nanoscale zero-valent iron (nZVI) shows excellent reduction of Cr(Ⅵ),but the passivation on its outer surface can restrict its longevity and performance. To tackle this problem,this work introduced Shewanella oneidensis MR-1,a dissimilatory iron-reducing bacterium,into the chemical reduction system of aged nZVI /biochar (B) and Cr(Ⅵ). The potential synergistic effect of Cr(Ⅵ) reduction of aged nZVI /B and MR-1 was systematically investigated under varying conditions. The results indicated that aged nZVI /B and MR-1 exhibited a synergistic effect at a pH of 7,and the removal rate of Cr(Ⅵ) increased by 51.3%. Further research showed that the synergistic effect could be attenuated with the increase in the initial Cr(Ⅵ) concentration and enhanced with the increase in the MR-1 concentration. The XPS spectra confirmed that Cr(Ⅵ) was mainly removed through reduction. The dissimilatory ironreducing ability of MR-1 played a key role in enhancing the Cr(Ⅵ) reduction. The reductive dissolution of the oxidation layers not only released reactive sites inside the nZVI,but also reduced Cr(Ⅵ) by producing ferrous ions. Moreover,B promoted the reduction by dispersing the nZVI and mediating the extracellular electron transfer. This study provides a new insight into solving the passivation problem of the long-term application of nZVI for Cr(Ⅵ) removal,which is considered a promising solution for synergistically improving the performance of nZVI in environmental remediation. |
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来源
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环境科学
,2021,42(9):4520-4526 【核心库】
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DOI
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10.13227/j.hjkx.202010021
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关键词
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老化纳米零价铁
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MR-1
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还原
;
协同效应
;
生物质炭
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地址
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1.
中国科学院广州地球化学研究所, 广州, 510640
2.
广东省科学院生态环境与土壤研究所, 广东省农业环境综合治理重点实验室, 广州, 510650
3.
华南土壤污染控制与修复国家地方联合工程研究中心, 华南土壤污染控制与修复国家地方联合工程研究中心, 广州, 510650
4.
中国科学院大学, 北京, 100049
5.
太原理工大学环境科学与工程学院, 太原, 030024
6.
佛山市环境保护投资有限公司, 佛山, 528100
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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0250-3301 |
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学科
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环境科学基础理论 |
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基金
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国家重点研发计划项目
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国家自然科学基金
;
国家自然科学基金
;
广东省珠江人才计划创新科研团队项目
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文献收藏号
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CSCD:7038296
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