{"title":"Heterogeneous Fenton-like CuO-CoO<sub>x</sub>/SBA-15 catalyst for organic pollutant degradation: synthesis, performance, and mechanism.","authors":"Jinwei Li, Yifei Wei, Qiang Liu, Huanhuan Guan, Chengchun Jiang, Xiaohui Sun","doi":"10.3389/fchem.2025.1552002","DOIUrl":null,"url":null,"abstract":"<p><p>In this study, CuO-CoO<sub>x</sub>/SBA-15 catalysts were successfully synthesized via ultrasonic impregnation, and their performance in degrading nitrobenzene within a Fenton-like system was investigated. The catalyst materials were characterized using X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), inductively coupled plasma mass spectrometry (ICP-MS), scanning electron microscopy (SEM), transmission electron microscope(TEM) and energy-dispersive X-ray spectroscopy (EDS). The CuO-CoO<sub>x</sub>/SBA-15 catalysts featured well-distributed CuO-CoO<sub>x</sub> nanoparticles within the mesoporous SBA-15 support. Compared to CuO/SBA-15 and Co<sub>3</sub>O<sub>4</sub>/SBA-15 catalysts with similar microstructures, the CuO-CoO<sub>x</sub>/SBA-15 catalysts exhibited Cu-Co dual active centers and a higher abundance of redox-active sites. During catalytic degradation, H<sub>2</sub>O<sub>2</sub> was continuously activated on the catalyst surface through efficient Cu<sup>+</sup>/Cu<sup>2+</sup> and Co<sup>2+</sup>/Co<sup>3+</sup> redox cycles. The experimental conditions (initial pH, catalyst dosage, and H<sub>2</sub>O<sub>2</sub> dosage) were optimized, resulting in 99% nitrobenzene removal over a wide pH range (3.0-9.0). The primary mechanisms for the oxidation and subsequent removal of nitrobenzene in the CuO-CoO<sub>x</sub>/SBA-15-H<sub>2</sub>O<sub>2</sub> system were identified as reactions with hydroxyl radicals (·OH).</p>","PeriodicalId":12421,"journal":{"name":"Frontiers in Chemistry","volume":"13 ","pages":"1552002"},"PeriodicalIF":3.8000,"publicationDate":"2025-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11880010/pdf/","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Frontiers in Chemistry","FirstCategoryId":"92","ListUrlMain":"https://doi.org/10.3389/fchem.2025.1552002","RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"2025/1/1 0:00:00","PubModel":"eCollection","JCR":"Q2","JCRName":"CHEMISTRY, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
Abstract
In this study, CuO-CoOx/SBA-15 catalysts were successfully synthesized via ultrasonic impregnation, and their performance in degrading nitrobenzene within a Fenton-like system was investigated. The catalyst materials were characterized using X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), inductively coupled plasma mass spectrometry (ICP-MS), scanning electron microscopy (SEM), transmission electron microscope(TEM) and energy-dispersive X-ray spectroscopy (EDS). The CuO-CoOx/SBA-15 catalysts featured well-distributed CuO-CoOx nanoparticles within the mesoporous SBA-15 support. Compared to CuO/SBA-15 and Co3O4/SBA-15 catalysts with similar microstructures, the CuO-CoOx/SBA-15 catalysts exhibited Cu-Co dual active centers and a higher abundance of redox-active sites. During catalytic degradation, H2O2 was continuously activated on the catalyst surface through efficient Cu+/Cu2+ and Co2+/Co3+ redox cycles. The experimental conditions (initial pH, catalyst dosage, and H2O2 dosage) were optimized, resulting in 99% nitrobenzene removal over a wide pH range (3.0-9.0). The primary mechanisms for the oxidation and subsequent removal of nitrobenzene in the CuO-CoOx/SBA-15-H2O2 system were identified as reactions with hydroxyl radicals (·OH).
期刊介绍：
Frontiers in Chemistry is a high visiblity and quality journal, publishing rigorously peer-reviewed research across the chemical sciences. Field Chief Editor Steve Suib at the University of Connecticut is supported by an outstanding Editorial Board of international researchers. This multidisciplinary open-access journal is at the forefront of disseminating and communicating scientific knowledge and impactful discoveries to academics, industry leaders and the public worldwide.
Chemistry is a branch of science that is linked to all other main fields of research. The omnipresence of Chemistry is apparent in our everyday lives from the electronic devices that we all use to communicate, to foods we eat, to our health and well-being, to the different forms of energy that we use. While there are many subtopics and specialties of Chemistry, the fundamental link in all these areas is how atoms, ions, and molecules come together and come apart in what some have come to call the “dance of life”.
All specialty sections of Frontiers in Chemistry are open-access with the goal of publishing outstanding research publications, review articles, commentaries, and ideas about various aspects of Chemistry. The past forms of publication often have specific subdisciplines, most commonly of analytical, inorganic, organic and physical chemistries, but these days those lines and boxes are quite blurry and the silos of those disciplines appear to be eroding. Chemistry is important to both fundamental and applied areas of research and manufacturing, and indeed the outlines of academic versus industrial research are also often artificial. Collaborative research across all specialty areas of Chemistry is highly encouraged and supported as we move forward. These are exciting times and the field of Chemistry is an important and significant contributor to our collective knowledge.
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