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Effects of environmental factors on the removal of heavy metals by sulfide-modified nanoscale zerovalent iron

机译：环境因素对硫化物改性纳米级氮价铁除去重金属的影响

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摘要

Sulfide-modified nanoscale zerovalent iron (S-nZVI) has excellent reducing performance for heavy metals in water. The influence of environmental factors on the reactivity can be used to explore the practical feasibility of S-nZVI and analyze the reaction mechanism in depth. This study compared the removal effect and mechanism of Cu~(2+) and Ni~(2+) by nanoscale zerovalent iron (nZVI), S-nZVI, and carboxymethyl cellulose-modified nanoscale zerovalent iron (CMC-nZVI). The results show that the pseudo-first-order kinetic constant of Cu~(2+) removal by nZVI, S-nZVI, and CMC-nZVI was 1.384, 1.919, and 2.890 min~(-1) respectively, and the rate of Ni~(2+) removal was 0.304, 0.931, and 0.360 min ~(-1), respectively. The removal mechanism of S-nZVI was similar to that of nZVI and CMC-nZVI. Specifically, Cu~(2+) was predominantly removed by reduction, while Ni~(2+) removal included adsorption and reduction. Environmental factors had a specific inhibitory effect on the removal of Cu~(2+) but had a negligible impact on Ni~(2+) . The condition of low pH, the presence of Cl~- and humic acid (HA) promoted the corrosion consumption of Fe~0, in which H~+ directly corroded Fe~0 at low pH. At the same time, Cl~- and HA inhibited the adsorption or binding of heavy metal ions on the particle surface, thereby reducing the electron transfer and utilization efficiency. The passivation of NO_3~- reduced the anaerobic corrosion of the material in water but suppressed the release of electrons, thereby reducing the reduction efficiency of the three types of materials. The anaerobic corrosion of S-nZVI was less affected by environmental factors, and it can still maintain more than 80% of the electronic utilization efficiency under different environmental factors, which illustrates that S-nZVI has broad prospects for practical applications in heavy metal polluted water.
机译：硫化物改性的纳米级齐价铁（S-NZVI）在水中的重金属具有优异的降低性能。环境因素对反应性的影响可用于探讨S-NZVI的实际可行性，并深入分析反应机制。该研究比较了Cu〜（2+）和Ni〜（2+）的去除效果和机理通过纳米级零铁（NZVI），S-NZVI和羧甲基纤维素改性纳米级Zeroportent铁（CMC-NZVI）。结果表明，NZVI，S-NZVI和CMC-NZVI的Cu〜（2+）除去的伪第一阶动力学常数分别为1.384,1.919和2.890分钟〜（-1）和率除去镍氢镍（2+）分别为0.304,0.931和0.360分钟〜（-1）。 S-NZVI的去除机制与NZVI和CMC-NZVI的去除机制类似。具体地，通过还原，主要除去Cu〜（2+），而Ni〜（2+）除去包括吸附和还原。环境因素对Cu〜（2+）的除去具有特异性抑制作用，但对Ni〜（2+）的影响可忽略不计。低pH的条件，Cl〜 - 和腐殖酸（HA）的存在促进了Fe〜0的腐蚀消耗，其中H〜+在低pH下直接腐蚀Fe〜0。同时，Cl〜 - HA抑制重金属离子对颗粒表面的吸附或结合，从而降低电子转移和利用效率。 NO_3〜 - 降低了水中材料的厌氧腐蚀，但抑制了电子的释放，从而降低了三种材料的减少效率。 S-NZVI的厌氧腐蚀受环境因素的影响较小，在不同的环境因素下仍然可以保持超过80％的电子利用效率，这表明S-NZVI对重金属污染水的实际应用具有广阔的前景。

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  • 来源
    《Environmental research》 |2020年第8期|109662.1-109662.10|共10页
  • 作者

    Weijian Xu; Xinyi Hu; Yiling Lou; Xiaodong Jiang; Keke Shi; Yanning Tong; Xinhua Xu; Chaofeng Shen; Baolan Hu; Liping Lou;

  • 作者单位

    Department of Environmental Engineering Zhejiang University Hangzhou 310029 People's Republic of China;

    Department of Environmental Engineering Zhejiang University Hangzhou 310029 People's Republic of China;

    Department of Environmental Engineering Zhejiang University Hangzhou 310029 People's Republic of China;

    Environemtal Science Research & Design Institute of Zhejiang Province Hangzhou 310007 People's Republic of China;

    Department of Environmental Engineering Zhejiang University Hangzhou 310029 People's Republic of China;

    Department of Environmental Engineering Zhejiang University Hangzhou 310029 People's Republic of China;

    Department of Environmental Engineering Zhejiang University Hangzhou 310029 People's Republic of China;

    Department of Environmental Engineering Zhejiang University Hangzhou 310029 People's Republic of China Key Laboratory of Water Pollution Control and Environmental Safety of Zhejiang Province 310020 People's Republic of China;

    Department of Environmental Engineering Zhejiang University Hangzhou 310029 People's Republic of China Key Laboratory of Water Pollution Control and Environmental Safety of Zhejiang Province 310020 People's Republic of China;

    Department of Environmental Engineering Zhejiang University Hangzhou 310029 People's Republic of China Key Laboratory of Water Pollution Control and Environmental Safety of Zhejiang Province 310020 People's Republic of China;

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  • 正文语种 eng
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  • 关键词

    Nanoscale zerovalent iron; Sulfidation; Heavy metal; Environmental factors; Electron utilization efficiency; Mechanism;

    机译：纳米级Zerovalent Iron;硫化;重金属;环境因素;电子利用效率;机制;

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