应用化学 ›› 2024, Vol. 41 ›› Issue (2): 268-278.DOI: 10.19894/j.issn.1000-0518.230311

• 研究论文 • 上一篇    下一篇

Co掺杂Mn2O3复合材料的构筑及活化过氧单硫酸盐降解医药废水

张涛, 张贺(), 杜雅欣, 展思辉   

  1. 南开大学环境科学与工程学院,天津 300350
  • 收稿日期:2023-10-10 接受日期:2023-12-24 出版日期:2024-02-01 发布日期:2024-03-05
  • 通讯作者: 张贺
  • 基金资助:
    国家自然科学基金(22225604);有机新物质创造前沿科学中心(63181206);海河可持续化学转化实验室资助

Cobalt-Doped Mn2O3 for Activation of Peroxymonosulfate for Degradation of Pharmaceutical Wastewater

Tao ZHANG, He ZHANG(), Ya-Xin DU, Si-Hui ZHAN   

  1. College of Environmental Science and Engineering,Nankai University,Tianjin 300350,China
  • Received:2023-10-10 Accepted:2023-12-24 Published:2024-02-01 Online:2024-03-05
  • Contact: He ZHANG
  • About author:hezhang@nankai.edu.cn
  • Supported by:
    the Natural Science Foundation of China(22225604);the Frontiers Science Center for New Organic Matter(63181206);Haihe Laboratory of Sustainable Chemical Transformations

摘要:

废水中的抗生素对人类健康与生态安全构成了重大威胁,通过活化过氧单硫酸盐(PMS)产生活性氧物种是处理抗生素废水的有效手段。 然而,由于电子迁移效率不足,实现高效的PMS活化仍然具有挑战性。 在此,Co掺杂的Mn2O3催化剂(Co5-Mn2O3)通过简单的一步煅烧法得到,以氧氟沙星(OFX)为目标污染物,考察了Co5-Mn2O3/PMS体系的降解性能,在15 min内OFX去除率达到了95%,相比于原始Mn2O3提升了12.3倍,同时Co5-Mn2O3/PMS体系对多种污染物(环丙沙星、磺胺甲恶唑、四环素、罗丹明B和甲基橙)均表现出良好的降解性能,体现了实际应用的潜力。 X射线光电子能谱证实,Co掺杂引起了催化剂表面重构与电子迁移实现了Mn4+-O-Co2+活性位点的形成。 猝灭实验分析,富电子Co位点与缺电子的Mn位点可以有效地活化PMS生成硫酸根自由基与单线态氧从而实现OFX的高效去除。 这项工作为控制催化功能提供了一种活性位点的结构调控方法,为自由基与非自由基耦合降解提供新视角。

关键词: Mn2O3, 过氧单硫酸盐活化, 医药废水, 活性位点, 电子转移, 氧氟沙星

Abstract:

Antibiotics in wastewater pose a major threat to human health and environmental safety, and the generation of reactive oxygen species by peroxomonosulfate (PMS)activation is an attractive option for the treatment of treating antibiotic wastewater. However, achieving efficient PMS activation remains challenging due to insufficient electron mobility efficiency. Herein, Co-doped Mn2O3 catalyst (Co5-Mn2O3) is prepared by a simple one-step calcination method, and the degradation performance of the Co5-Mn2O3/PMS system is investigated using ofloxacin (OFX) as the target pollutant, and the removal of OFX reaches 95% within 15 min, which is 12.3-fold enhancement compared with the pristine Mn2O3, and the degradation performance of the Co5-Mn2O3/PMS system shows excellent degradation performance for a variety of pollutants (ciprofloxacin, sulfamethoxazole, tetracycline, rhodamine B, and methyl orange), which demonstrates the potential for practical applications. It is confirmed by X-ray photoelectron spectroscopy that Co doping induces the surface reconstruction of the catalyst and electron migration to achieve the formation of Mn4+-O-Co2+ active sites. Trap experiments show that the electron-rich Co site and the electron-deficient Mn site could effectively activate PMS to generate sulfate radicals and singlet oxygen for the efficient removal of ofloxacin. This work provides a structural modulation method of the active site for controlling the catalytic function, which will provide a new perspective for the rational design of Fenton-like catalysts.

Key words: Peroxomonosulfate activation, Pharmaceutical wastewater, Active site, Electron transfer, Ofloxacin

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