ZnFe2O4 substituted with Cu atoms for ultra-efficient formation of sulfate radicals: Extremely low catalyst dosage for thiamethoxam degradation

IF 7.2 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Applied Materials Today Pub Date : 2024-08-12 DOI:10.1016/j.apmt.2024.102390

Yuan Gao, Lian-Peng Li, Si-Yan Gong, Jia-Hui Huang, Shuo Xiang, Gan He, Qiong-Yu Wang, Mian Hu, Junliang Wang, Zhiyan Pan, Zhong-Ting Hu

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引用次数: 0

Abstract

Neonicotinoids as one of the newest major class of insecticides is a kind of persistent pollutants. Herein, copper-substituted zinc ferrites (CuZnFeO) prepared in subcritical aqueous solution has a nanosize of ∼2 nm with high crystallinity and strong magnetic property. At low catalyst dosage of 0.05 g L, peroxymonosulfate (PMS) can be effectively converted into sulfate radicals in CuZnFeO/PMS system. Thiamethoxam (THIA) degradation rate is in the order of CuZnFeO > CuFeO > ZnFeO (124, 84, 21 × 10 min, respectively). At pH ∼7.0, THIA degradation efficiency can be over 99 % in 40 min. The radical species (, HO, SO and O) were demonstrated by EPR spectra using probe molecules. The majority effects in CuZnFeO/PMS system with kinetics modelling were comprehensively investigated as well. This work provides that multi-metal coupling, , Cu(Ⅰ)/Cu(Ⅱ) & Fe(Ⅱ)/Fe(Ⅲ), in spinel structure by polyhedral design is an effective strategy for enhancing the catalytic activity. The CuZnFeO/PMS system has promising for water treatment of neonicotinoid insecticide with ease of recycling catalysts by magnetic separation.

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用铜原子取代 ZnFe2O4，可超高效率地形成硫酸根自由基：噻虫嗪降解催化剂用量极低

新烟碱类杀虫剂作为最新的主要杀虫剂之一，是一种持久性污染物。在亚临界水溶液中制备的铜代锌铁氧体（CuZnFeO）具有 2 nm 的纳米尺寸、高结晶性和强磁性。在 0.05 g L 的低催化剂用量下，CuZnFeO/PMS 体系能有效地将过硫酸盐（PMS）转化为硫酸根。噻虫嗪（THIA）的降解速率依次为 CuZnFeO > CuFeO > ZnFeO（分别为 124、84、21 × 10 min）。在 pH ∼ 7.0 的条件下，40 分钟内 THIA 的降解效率可达 99% 以上。利用探针分子的 EPR 光谱证明了自由基物种（HO、SO 和 O）。此外，还利用动力学模型全面研究了 CuZnFeO/PMS 系统中的多数效应。这项研究表明，通过多面体设计在尖晶石结构中实现 Cu(Ⅰ)/Cu(Ⅱ) & Fe(Ⅱ)/Fe(Ⅲ) 多金属耦合是提高催化活性的有效策略。CuZnFeO/PMS 系统有望用于新烟碱类杀虫剂的水处理，并易于通过磁分离回收催化剂。

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来源期刊

Applied Materials Today Materials Science-General Materials Science

CiteScore

14.90

自引率

3.60%

发文量

393

审稿时长

26 days

期刊介绍： Journal Name: Applied Materials Today Focus: Multi-disciplinary, rapid-publication journal Focused on cutting-edge applications of novel materials Overview: New materials discoveries have led to exciting fundamental breakthroughs. Materials research is now moving towards the translation of these scientific properties and principles.