Environmental Engineering Science最新文献

英文中文

Introducing MXenes into the Heterogeneous Catalyst: Synthesizing Mo₂CT_x@Fe₃O₄ with Excellent Recoverability to Degrade Methylisothiazolinone in the Electro-Fenton System 将MXenes引入非均相催化剂:在电fenton系统中合成具有优异回收率的降解甲基异噻唑啉酮Mo2CTx@Fe3O4

4区环境科学与生态学 Q4 ENGINEERING, ENVIRONMENTAL

Environmental Engineering Science

Pub Date : 2023-09-25 DOI: 10.1089/ees.2023.0078

Liping Wei, Kexin Zhou, Qian Rao, Hui-qiang Li, Ping Yang

Methylisothiazolinone (MIT) is a commonly used bactericide in wastewater treatment. Residual MIT in wastewater can lead to high environmental risks and toxicity. In this work, an emerging material MXenes has been introduced into the heterogeneous electro-Fenton catalysts to degrade MIT. Ti3C2Tx@Fe3O4, V2CTx@Fe3O4, and Mo2CTx@Fe3O4 were assessed as catalysts for MIT removal. The reasons for the differences among the three catalyst effects were analyzed according to different characterization results. Mo2CTx@Fe3O4 exhibited the best catalytic activity for MIT degradation. At pH = 3, the removal rate of MIT and corresponding chemical oxygen demand of catalyst Mo2CTx@Fe3O4 were 93.41% and 62.46% after 120 min. Among the three catalysts, Mo2CTx@Fe3O4 had larger surface area and porosity. Mo2CTx@Fe3O4 had the highest surface iron content, which meant that Fe3O4 was more easily loaded on the surface of Mo2CTX. What is more, Mo2CTX had the strongest ability to accelerate the regeneration of Fe2+. The durability of Mo2CTx@Fe3O4 was also evaluated. After four cycles, the removal efficiency of MIT only decreased from 92.51% to 89%. This work supports the development of heterogeneous electro-Fenton catalysts and the degradation of MIT.

甲基异噻唑啉酮(Methylisothiazolinone, MIT)是废水处理中常用的杀菌剂。废水中残留的MIT具有很高的环境风险和毒性。在这项工作中，一种新兴的材料MXenes被引入到非均相电fenton催化剂中来降解MIT。对Ti3C2Tx@Fe3O4、V2CTx@Fe3O4和Mo2CTx@Fe3O4作为去除MIT的催化剂进行了评价。根据不同的表征结果，分析了三种催化剂效果差异的原因。Mo2CTx@Fe3O4对MIT的降解表现出最好的催化活性。pH = 3时，120 min后，Mo2CTx@Fe3O4催化剂对MIT的去除率和相应的化学需氧量分别为93.41%和62.46%，其中Mo2CTx@Fe3O4催化剂的表面积和孔隙率较大。Mo2CTx@Fe3O4表面铁含量最高，这意味着Fe3O4更容易被加载到Mo2CTX表面。其中，Mo2CTX对Fe2+的加速再生能力最强。对Mo2CTx@Fe3O4的耐久性进行了评价。4个循环后，MIT的去除率仅从92.51%下降到89%。这项工作支持了非均相电fenton催化剂的发展和MIT的降解。

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