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首页> 外文期刊>Journal of Hazardous Materials >Mechanism insights into enhanced Cr(Ⅵ) removal using nanoscale zerovalent iron supported on the pillared bentonite by macroscopic and spectroscopic studies
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Mechanism insights into enhanced Cr(Ⅵ) removal using nanoscale zerovalent iron supported on the pillared bentonite by macroscopic and spectroscopic studies

机译：宏观和光谱研究深入研究了柱撑膨润土上负载的纳米级零价铁对Cr（Ⅵ）的去除机理

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摘要

NZVI was supported on a pillared bentonite (Al-bent) to enhance the reactivity of NZVI and prevent its aggregation. The performance and mechanisms of the combined NZVI/Al-bent on removing hexavalent chromium (Cr(Ⅵ)) was investigated by batch and XAFS experiments. The batch investigations indicated that Cr(Ⅵ) could be almost completely removed by NZVI/AI-bent after 120min. The efficiency was not only much higher than that by NZVI (63.0%), but also superior to the sum of NZVI reduction and Al-bent adsorption (12.4%). Besides, NZVI/AI-bent exhibited good stability and reusability, and Al-bent could reduce the amount of iron ions released into the solution. XANES results provided evidence that NZVI/AI-bent could reduce Cr(Ⅵ) entirely into Cr(Ⅲ), while NZVI reduced Cr(Ⅵ) partly into Cr(Ⅲ) with a trace of Cr(Ⅵ) adsorbed on the corrosion products. The structure of Cr(Ⅵ)-treated NZVI/AI-bent determined with EXAFS revealed the formation of Cr-Al/Si bond, suggesting that some insoluble Cr(Ⅲ) species might be transferred to the surface of Al-bent, therefore the precipitates on iron surface could be greatly reduced. The results demonstrated that Al-bent plays a significant role in enhanced reactivity and stability of NZVI, and may shed new light on design and fabrication of supported NZVI for environmental remediation.
机译：NZVI被支撑在柱状膨润土（铝弯曲）上，以增强NZVI的反应性并防止其聚集。通过分批和XAFS实验研究了NZVI /铝结合剂去除六价铬（Cr（Ⅵ））的性能和机理。批处理研究表明，在120分钟后，NZVI / AI弯曲几乎可以完全去除Cr（Ⅵ）。效率不仅大大高于NZVI（63.0％），而且优于NZVI减少和铝弯曲吸附的总和（12.4％）。此外，NZVI / AI弯曲剂表现出良好的稳定性和可重复使用性，而Al弯曲剂可以减少释放到溶液中的铁离子量。 XANES结果提供了证据，证明NZVI / Al弯曲剂可以将Cr（Ⅵ）完全还原为Cr（Ⅲ），而NZVI / Cr可以部分地将Cr（Ⅵ）还原为Cr（Ⅲ），而微量的Cr（Ⅵ）则被吸附在腐蚀产物上。用EXAFS测定的Cr（Ⅵ）处理的NZVI / AI-bent的结构揭示了Cr-Al / Si键的形成，表明某些不溶性Cr（Ⅲ）可能转移到Al-bent的表面，因此铁表面的沉淀物可以大大减少。结果表明，Al-bent在提高NZVI的反应性和稳定性方面起着重要作用，并可能为支持的NZVI的环境修复设计和制造提供新的思路。

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