Metal–organic frameworks (MOFs) are a new class of hybrid porous materials built from organic linkers and inorganic metals, and have been used as adsorbent materials for the removal of heavy metals present in wastewater. While MOFs reduce the toxicity of wastewater by removing heavy metals, it has been reported that they can present some inhibitory effects, intrinsically or through the release of their metal cluster, although these aspects have only rarely been reported. In this work, the toxicity of [Co₂(btec)(bipy)(DMF)₂]_n (MOF-Co), as well as its impact on the toxicity exerted by As(III), was examined using activated sludge in the treatment of synthetic wastewater as an experimental model. Toxicity was assessed through microrespirometry using a wide range of MOF-Co and As(III) concentrations in different configurations. In each case, inhibition was quantified, and the main kinetic parameters were determined. The obtained results confirmed the noncompetitive inhibitory effect of As(III), as well as a significant reduction (by up to 98%) in this inhibitory effect in the presence of MOF-Co. It is concluded that MOF-Co has no effect on activated sludge and might be an efficient material for the removal of heavy metals in wastewater, although further studies are required to establish efficient application and recovery methods.

中文翻译：

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对金属-有机框架[Co2（btec）（bipy）（DMF）2] n（“ MOF-Co”）进行微呼吸测定，以防止砷对活性污泥的抑制

金属有机骨架（MOF）是一类新型的由有机连接基和无机金属构成的杂化多孔材料，已被用作吸附剂，用于去除废水中的重金属。尽管MOF通过去除重金属降低了废水的毒性，但据报道，尽管它们很少被报道，但它们可以固有地或通过释放其金属簇而表现出某些抑制作用。在这项工作中，[Co ₂（btec）（bipy）（DMF）₂ ] _n（MOF-Co）的毒性及其对As（III）毒性的影响），使用活性污泥处理合成废水作为实验模型进行了研究。通过微量呼吸测定法，使用不同浓度的多种MOF-Co和As（III）浓度评估毒性。在每种情况下，对抑制作用进行定量，并确定主要动力学参数。所获得的结果证实了As（III）的非竞争性抑制作用，并且在存在MOF-Co的情况下，这种抑制作用显着降低（最高达98％）。结论是，尽管需要进一步研究以建立有效的应用和回收方法，但是MOF-Co对活性污泥没有影响，并且可能是去除废水中重金属的有效材料。