Efficient oxidation from arsenite [As(III)] to arsenate [As(V)], which is less toxic and more readily to be adsorbed by adsorbents, is important for the remediation of arsenic pollution. In this paper, we report a metal organic framework (MIL-100(Fe)) filter to efficiently remove arsenic from synthetic groundwater. With commercially available iron mesh as a substrate, MIL-100(Fe) is implanted through an in situ growth method. MIL-100(Fe) is able to capture As(III) due to its microporous structure, superior surface area, and ample active sites for As adsorption. This approach increases the localized As concentration around the filter, where Fenton-like reactions are initiated by the Fe²⁺/Fe³⁺ sites within the MIL-100(Fe) framework to oxidize As(III) to As(V). The mechanism was confirmed by colorimetric detection of H₂O₂, fluorescence, and electron paramagnetic resonance detection of ·OH. With the aid of oxygen bubbling and Joule heating, the removal efficiency of As(III) can be further boosted. The MIL-100(Fe)-based filter also exhibits satisfactory structural stability and recyclability. Notably, the adsorption capacity of the filter can be regenerated satisfactorily. Our results demonstrate the potential of this filter for the efficient remediation of As contamination in groundwater.

中文翻译：

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铁网基金属有机骨架过滤器，有效去除砷

从砷毒[As（III）]到砷酸盐[As（V）]的有效氧化（毒性较小，更容易被吸附剂吸附）对于修复砷污染很重要。在本文中，我们报告了一种金属有机骨架（MIL-100（Fe））过滤器，可有效去除合成地下水中的砷。使用市售的铁网作为基材，通过原位生长方法植入MIL-100（Fe）。MIL-100（Fe）能够捕获As（III），因为它具有微孔结构，优越的表面积以及足够的As吸附活性位。这种方法增加了过滤器周围的局部As浓度，其中Fe ²⁺ / Fe ³⁺引发了Fenton样反应。MIL-100（Fe）框架内的多个位点将As（III）氧化为As（V）。H ₂ O ₂的比色检测，荧光和·OH的电子顺磁共振检测证实了该机理。借助于氧气鼓泡和焦耳加热，可以进一步提高As（III）的去除效率。基于MIL-100（Fe）的过滤器还具有令人满意的结构稳定性和可回收性。值得注意的是，过滤器的吸附能力可以令人满意地再生。我们的结果证明了该过滤器在有效修复地下水中As污染方面的潜力。