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首页> 外文期刊>Environmental Science & Technology >Role of Nanoparticles in Controlling Arsenic Mobilization from Sediments near a Realgar Tailing
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Role of Nanoparticles in Controlling Arsenic Mobilization from Sediments near a Realgar Tailing

机译:纳米颗粒在控制雄黄尾矿附近沉积物中砷动员中的作用

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摘要

Microcosm experiments were conducted to investigate the mechanism of microbial-mediated As mobilization from high arsenic tailing sediments amended with nanoparticles (NPs). The addition of SiO_2 NPs could substantially stimulate arsenic mobilization in the sodium acetate amendment sediments. However, the addition of Fe_2O_3 and Fe_3O_4 NPs restrained arsenic release because these NPs resulted in Fe-As copredpiate. Moreover, NP additions in sediments amended with sodium acetate as the electron donor clearly promoted microbial dissimilatory iron reduction. Nearly 4 times the Fe(Ⅱ) (11.67-12.87 mg· L~(-1)) from sediments amended with NPs and sodium acetate was released compared to sediments amended with only sodium acetate (3.49 mg·L~(-1)). Based on molecular fingerprinting and sequencing analyses, the NP additions could potentially change the sediment bacterial community composition and increase the abundance of Fe(Ⅲ) and As(Ⅴ) reduction bacteria. Several potential NP-stimulated bacteria were related to Geobacter, Anaeromyxobacter, Clostridium, and Alicyclobacillus. The findings offer a relatively comprehensive assessment of NP (e.g., Fe_2O_3, Fe_3O_4, and SiO_2) effects on sediment bacterial communities and As mobilization.
机译:进行了微观实验,研究了用纳米颗粒(NPs)修饰的高砷尾矿沉积物中微生物介导的As动员的机理。 SiO_2 NPs的加入可以大大刺激乙酸钠改性沉积物中砷的迁移。但是,Fe_2O_3和Fe_3O_4 NP的添加抑制了砷的释放,因为这些NP导致Fe-As共沉淀。此外,用醋酸钠作为电子给体对沉积物中的NP进行添加,明显促进了微生物异化铁的还原。与仅用乙酸钠修正的沉积物(3.49 mg·L〜(-1))相比,被NPs和乙酸钠修正的沉积物中的Fe(Ⅱ)(11.67-12.87 mg·L〜(-1))释放近四倍。 。根据分子指纹图谱和测序分析,NP的添加可能改变沉积物细菌群落组成,并增加Fe(Ⅲ)和As(Ⅴ)还原菌的丰度。几种潜在的NP刺激细菌与Geobacter,厌氧厌氧杆菌,梭状芽胞杆菌和脂环酸杆菌有关。这些发现提供了相对全面的NP(例如Fe_2O_3,Fe_3O_4和SiO_2)对沉积物细菌群落和As迁移的影响的评估。

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  • 来源
    《Environmental Science & Technology》 |2014年第13期|7469-7476|共8页
  • 作者单位

    Department of Chemical and Biochemical Engineering, College of Chemistry and Chemical Engineering, and The Key Laboratory for Synthetic Biotechnology of Xiamen City, Xiamen University, Xiamen, P. R. China,College of Resources & Chemical Engineering, Sanming University, Sanming, P. R. China,Environmental Science Research Center, College of the Environment & Ecology, Xiamen University, Xiamen, P. R. China;

    Department of Chemical and Biochemical Engineering, College of Chemistry and Chemical Engineering, and The Key Laboratory for Synthetic Biotechnology of Xiamen City, Xiamen University, Xiamen, P. R. China;

    Department of Chemical and Biochemical Engineering, College of Chemistry and Chemical Engineering, and The Key Laboratory for Synthetic Biotechnology of Xiamen City, Xiamen University, Xiamen, P. R. China;

    Department of Chemical and Biochemical Engineering, College of Chemistry and Chemical Engineering, and The Key Laboratory for Synthetic Biotechnology of Xiamen City, Xiamen University, Xiamen, P. R. China;

    Department of Chemical and Biochemical Engineering, College of Chemistry and Chemical Engineering, and The Key Laboratory for Synthetic Biotechnology of Xiamen City, Xiamen University, Xiamen, P. R. China;

    Department of Chemical and Biochemical Engineering, College of Chemistry and Chemical Engineering, and The Key Laboratory for Synthetic Biotechnology of Xiamen City, Xiamen University, Xiamen, P. R. China;

    Department of Chemical and Biochemical Engineering, College of Chemistry and Chemical Engineering, and The Key Laboratory for Synthetic Biotechnology of Xiamen City, Xiamen University, Xiamen, P. R. China,College of Chemistry and Life Science, Quanzhou Normal University, Quanzhou, P. R. China,Environmental Science Research Center, College of the Environment & Ecology, Xiamen University, Xiamen, P. R. China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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