Unleashing the power of cobalt pyroborate: superior performance in sulfate radical advanced oxidation processes†

IF 8.3 2区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY
En-Xuan Lin, Fang-Yu Wu, Yu-Lun Zhu, Yu-Rong Chang, Po-Yi Wu and Pei Yuin Keng
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Abstract

This study presents structurally robust cobalt pyroborate (Co2B2O5) as a heterogeneous catalyst for advanced oxidation processes (AOPs). The Co2B2O5 nanoparticles were systematically characterized and employed to activate peroxymonosulfate (PMS) effectively in the degradation of various organic recalcitrant pollutants. When compared to conventional heterogeneous CoO and Co3O4 catalysts in sulfate radical-advanced oxidation processes (SR-AOPs), the Co2B2O5 catalyst exhibited seven-fold and 2.7-fold increases in degradation rate, respectively. The Co2B2O5/PMS system was optimized to enable degradation of a diverse array of persistent organic pollutants, including tetracycline, 4-nitrophenol and sulfamethoxazole, with respective first-order rate constants of 0.136 min−1 and 0.104 min−1, and 0.092 min−1, respectively. Mechanistic insights, supported by selective trapping experiments and electron paramagnetic resonance (EPR) analyses, revealed that surface-bound sulfate radicals serve as the primary reactive oxygen species (ROS) under dark conditions. Singlet oxygen species also contributed to the degradation process via a non-radical pathway. Remarkably, the catalyst maintained its effectiveness in the presence of natural organic matter, highlighting its potential practical applicability for wastewater treatment. This study presents the single-component cobalt pyroborate catalyst with high catalytic activity under varying conditions, thus providing unprecedented benefits for industrial wastewater treatment applications.

Abstract Image

释放焦硼酸钴的能量:硫酸盐自由基高级氧化工艺的卓越性能
本研究提出了一种结构坚固的焦硼酸钴(Co2B2O5)作为高级氧化工艺(AOP)的异质材料。研究对 Co2B2O5 纳米粒子进行了系统表征,并将其用于活化过一硫酸盐(PMS),从而有效降解各种有机难降解物。在硫酸盐自由基高级氧化过程(SR-AOP)中,与传统的异相 CoO 和 Co3O4 催化剂相比,Co2B2O5 催化剂的降解率分别提高了 7 倍和 2.7 倍。经过优化的 Co2B2O5/PMS 系统能够降解多种持久性有机污染物,包括四环素、4-硝基苯酚和磺胺甲噁唑,其一阶速率常数分别为 0.136 min-1 和 0.104 min-1 以及 0.选择性捕获实验和电子顺磁共振(EPR)分析表明,在黑暗条件下,表面结合的硫酸根自由基是主要的活性氧(ROS)。单线态氧也通过非自由基途径参与了降解过程。值得注意的是,该催化剂在天然有机物存在的情况下仍能保持其有效性,这突显了其在废水处理方面的潜在实用性。本研究提出的单组分焦硼酸钴催化剂在不同条件下具有很高的催化活性,从而为工业废水处理应用带来了前所未有的好处。
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来源期刊
ACS Applied Materials & Interfaces
ACS Applied Materials & Interfaces 工程技术-材料科学:综合
CiteScore
16.00
自引率
6.30%
发文量
4978
审稿时长
1.8 months
期刊介绍: ACS Applied Materials & Interfaces is a leading interdisciplinary journal that brings together chemists, engineers, physicists, and biologists to explore the development and utilization of newly-discovered materials and interfacial processes for specific applications. Our journal has experienced remarkable growth since its establishment in 2009, both in terms of the number of articles published and the impact of the research showcased. We are proud to foster a truly global community, with the majority of published articles originating from outside the United States, reflecting the rapid growth of applied research worldwide.
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