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Efficient removal of neonicotinoid by singlet oxygen dominated MoSx/ceramic membrane-integrated Fenton-like process
Journal of Hazardous Materials ( IF 13.6 ) Pub Date : 2022-07-26 , DOI: 10.1016/j.jhazmat.2022.129672
Qiuying Yi 1 , Yang Li 1 , Ruobin Dai 1 , Xuesong Li 1 , Zhouyan Li 1 , Zhiwei Wang 2
Affiliation  

Removal of neonicotinoids (NEOs) from contaminated water is of great importance for both ecological environment and human health. However, conventional Fenton process might be insufficient for NEOs removal due to short lifetime for generated HO and limited Fe3+/Fe2+ redox cycle. Advancing Fenton process to produce singlet oxygen can be an effective route to improve its efficacy for NEOs removal. Herein, we developed a molybdenum sulfide modified ceramic membrane-integrated Fenton-like system to achieve efficient catalytic removal of NEOs. The reduced Mo0 and Mo4+ could promote the reduction process of Fe3+ to Fe2+, improving the activation efficiency of hydrogen peroxide (H2O2) and the generation of superoxide radical (O2•−). Consequently, the coexisting Mo6+ reacted with O2•− to generate 1O2. The membrane enabled the pollutants to adequately contact oxidants due to the enhanced convective mass transfer. The functionalized membrane exhibited stable catalytic performance for clothianidin (CLO, a kind of NEOs, 10 mg/L) removal (degradation efficiency > 85%). The presence of 1O2 enabled the dechlorination and hydroxylation of CLO and thus reduced the toxicity of wastewater. Our work sheds light on the use of functionalized ceramic membrane integrated catalytic Fenton system for effective environmental remediation.



中文翻译:

单线态氧主导的 MoSx/陶瓷膜集成类 Fenton 工艺有效去除新烟碱

从受污染的水中去除新烟碱(NEO)对生态环境和人类健康都具有重要意义。然而,由于生成的 H2O •寿命短且 Fe 3+ /Fe 2+氧化还原循环有限,传统的 Fenton 工艺可能不足以去除 NEO 。推进 Fenton 工艺生产单线态氧可能是提高其去除 NEO 功效的有效途径。在此,我们开发了一种硫化钼改性陶瓷膜集成的类 Fenton 系统,以实现 NEO 的高效催化去除。还原的Mo 0和Mo 4+可以促进Fe 3+向Fe 2+的还原过程,提高过氧化氢(H 2 O 2)的活化效率和超氧自由基(O 2 •-)的产生。因此,共存的Mo 6+与O 2 •-反应生成1 O 2。由于增强的对流传质,该膜使污染物能够充分接触氧化剂。功能化膜对噻虫胺(CLO,一种近地天体,10 mg/L)的去除表现出稳定的催化性能(降解效率> 85%)。1 O 2的存在使 CLO 脱氯和羟基化,从而降低废水的毒性。我们的工作揭示了使用功能化陶瓷膜集成催化芬顿系统进行有效的环境修复。

更新日期:2022-07-29
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