En-Xuan Lin, Fang-Yu Wu, Yu-Lun Zhu, Yu-Rong Chang, Po-Yi Wu and Pei Yuin Keng
{"title":"Unleashing the power of cobalt pyroborate: superior performance in sulfate radical advanced oxidation processes†","authors":"En-Xuan Lin, Fang-Yu Wu, Yu-Lun Zhu, Yu-Rong Chang, Po-Yi Wu and Pei Yuin Keng","doi":"10.1039/D4EN00516C","DOIUrl":null,"url":null,"abstract":"<p >This study presents structurally robust cobalt pyroborate (Co<small><sub>2</sub></small>B<small><sub>2</sub></small>O<small><sub>5</sub></small>) as a heterogeneous catalyst for advanced oxidation processes (AOPs). The Co<small><sub>2</sub></small>B<small><sub>2</sub></small>O<small><sub>5</sub></small> 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 Co<small><sub>3</sub></small>O<small><sub>4</sub></small> catalysts in sulfate radical-advanced oxidation processes (SR-AOPs), the Co<small><sub>2</sub></small>B<small><sub>2</sub></small>O<small><sub>5</sub></small> catalyst exhibited seven-fold and 2.7-fold increases in degradation rate, respectively. The Co<small><sub>2</sub></small>B<small><sub>2</sub></small>O<small><sub>5</sub></small>/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<small><sup>−1</sup></small> and 0.104 min<small><sup>−1</sup></small>, and 0.092 min<small><sup>−1</sup></small>, 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 <em>via</em> 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.</p>","PeriodicalId":5,"journal":{"name":"ACS Applied Materials & Interfaces","volume":null,"pages":null},"PeriodicalIF":8.3000,"publicationDate":"2024-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"ACS Applied Materials & Interfaces","FirstCategoryId":"6","ListUrlMain":"https://pubs.rsc.org/en/content/articlelanding/2024/en/d4en00516c","RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
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.
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.