首页> 外文期刊>Journal of Environmental Management >Synergistic effect between sulfide mineral and acidophilic bacteria significantly promoted Cr(Ⅵ) reduction
【24h】

Synergistic effect between sulfide mineral and acidophilic bacteria significantly promoted Cr(Ⅵ) reduction

机译:硫化物矿物与嗜酸细菌之间的协同作用显着促进了Cr(Ⅵ)的还原

获取原文
获取原文并翻译 | 示例
       

摘要

Natural pyrite was an economical choice for efficient Cr(VI) remediation, while its deep utilization was inhibited due to the passivation effect. In this study, pyrite passivation/dissolution and active sites regeneration mechanism under the activity of acidophilic bacteria with different energy metabolism characteristic in Cr(VI) reduction have been investigated. The reduction capacity was in the order of Acidithiobacillus thiooxidans, Acidithiobacillus ferrooxidans(S), Acidithiobacillus ferrooxidans(Fe), Leptospirillum ferrooxidans and chemical control. The maximal reduction efficiency was achieved in A. thiooxidans system, which is 4.5 times higher than the L. ferrooxidans system. In chemical system, sulfur and Fe(III)/Cr(III)-oxyhydroxysulphate accumulation would result in pyrite passivation. A. thiooxidans attached on pyrite surface and exerted synergistic effect on pyrite corrosion coupled with Cr(VI). Sulfur oxidation promoted proton regeneration, pyrite lattice Fe(II) dissolution and active sites regeneration, which were beneficial to sustainable Cr(VI) reduction. Secondary iron mineral formation on pyrite was accelerated with the iron oxidation bacteria activity increasing. Excessive oxidation to surface sites Fe(II) and the accumulation of S-0/S-n(2-) led to the passivation effect in L. ferrooxidans system. Cr(VI) acquired electron from Fe(II) and disulfide and resulted in the bond break between them. The combined effect of specific sulfur oxidizing bacteria activity and Cr(VI) oxidation efficient promoted pyrite dissolution and active sites regeneration. The interaction between acidophilic bacteria and pyrite significantly enhanced Cr(VI) reduction efficiency. (C) 2018 Elsevier Ltd. All rights reserved.
机译:天然黄铁矿是有效修复Cr(VI)的经济选择,但由于钝化作用,其深度利用受到抑制。在这项研究中,研究了黄铁矿钝化/溶解和活性位点再生机制在具有不同能量代谢特征的六价铬还原过程中的嗜酸细菌的活性下。还原能力按硫代酸性硫杆菌,铁氧化性硫杆菌,铁氧化性硫杆菌,铁氧化钩端螺旋体的顺序排列。在硫代农杆菌系统中实现了最大的还原效率,这是氧化亚铁劳森系统的4.5倍。在化学系统中,硫和Fe(III)/ Cr(III)-羟基羟基硫酸盐的积累会导致黄铁矿钝化。 A. thiooxidans附着在黄铁矿表面,并与Cr(VI)协同作用于黄铁矿腐蚀。硫的氧化促进了质子再生,黄铁矿晶格Fe(II)的溶解和活性位点的再生,这有利于Cr(VI)的可持续还原。随着铁氧化细菌活性的增加,黄铁矿上次生铁矿物的形成被加速。过度氧化到表面位点Fe(II)和S-0 / S-n(2-)的积累导致了L.ferrooxidans系统中的钝化作用。 Cr(VI)从Fe(II)和二硫化物获取电子,并导致它们之间的键断裂。特定的硫氧化细菌活性和Cr(VI)氧化效率的联合作用促进了黄铁矿溶解和活性位点的再生。嗜酸细菌和黄铁矿之间的相互作用显着提高了六价铬的还原效率。 (C)2018 Elsevier Ltd.保留所有权利。

著录项

  • 来源
    《Journal of Environmental Management》 |2018年第1期|84-94|共11页
  • 作者单位

    Cent S Univ, Minist Educ, Key Lab Biomet, Sch Minerals Proc & Bioengn, Changsha 410083, Hunan, Peoples R China;

    Cent S Univ, Minist Educ, Key Lab Biomet, Sch Minerals Proc & Bioengn, Changsha 410083, Hunan, Peoples R China;

    Univ Queensland, Adv Water Management Ctr, Bldg 60,Res Rd, Brisbane, Qld 4072, Australia;

    Cent S Univ, Minist Educ, Key Lab Biomet, Sch Minerals Proc & Bioengn, Changsha 410083, Hunan, Peoples R China;

    Cent S Univ, Minist Educ, Key Lab Biomet, Sch Minerals Proc & Bioengn, Changsha 410083, Hunan, Peoples R China;

    Cent S Univ, Minist Educ, Key Lab Biomet, Sch Minerals Proc & Bioengn, Changsha 410083, Hunan, Peoples R China;

    Cent S Univ, Minist Educ, Key Lab Biomet, Sch Minerals Proc & Bioengn, Changsha 410083, Hunan, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Pyrite; Acidophilic bacteria; Cr(VI) reduction; Surface passivation; Active sites regeneration;

    机译:黄铁矿;嗜酸菌;Cr(VI)还原;表面钝化;活性部位再生;

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号