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Photochemistry of biochar during ageing process: Reactive oxygen species generation and benzoic acid degradation

发布时间：2024-09-28点击次数：

  • DOI码：10.1016/j.scitotenv.2020.144630
  • 发表刊物：Science of the Total Emvironment
  • 关键字：1O2; Biochar; Degradation; *OH
  • 摘要：In this study, the photogeneration of [rad]OH and 1O2 and the degradation mechanism of organic pollutants in biochar suspension under the simulated solar light irradiations were investigated. Biochar derived from rice husk with 550 °C of charring temperature (R550) was selected to degrade benzoic acid. It was found that 10 g/L of R550 could degrade 78.7% of benzoic acid within 360 min at pH 3, and the degradation efficiency was promoted to 95.2% as ultraviolet (UV) presented. By checking the production of p-hydroxybenzoic acid, UV accelerated the production of [rad]OH, which was confirmed by the enhanced degradation efficiency of 59.2% caused by the evaluated [rad]OH as UV appeared. The furfuryl alcohol loss in the R550 suspension under light irradiations testified to the production of 1O2, which contributed to 9.3% of benzoic acid degradation. Oxidization treatment using gradient concentrations of H2O2 was employed to enhance the ageing process of biochar. As the ageing processed, the biochar possessed a declined performance towards [rad]OH production from O2 activation and the radical degradation of organic pollutants. As a contrast, the evaluated content of 1O2 and enhanced non-radical degradation of organic pollutants was reached as UV presented. The further study indicated that phenolic hydroxyl groups on biochar facilitated the production of [rad]OH via the electron transfer, and quinone like structures (C=O) on biochar boosted the generation of 1O2 via the energy transfer. Moreover, upon eliminating the BA degradation, persistent free radicals were formed on biochar, which was enhanced owing to the presence of UV
  • 论文类型：期刊论文
  • 论文编号：144630
  • 学科门类：工学
  • 一级学科：环境科学与工程
  • 文献类型：J
  • 卷号：765
  • ISSN号：0048-9697
  • 是否译文：否
  • 发表时间：2021-04-15
  • 收录刊物：SCI

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张凯凯

个人信息

  • 教师英文名称：Kaikai Zhang
  • 教师拼音名称：zhangkaikai
  • 电子邮箱：
  • 所在单位：环境与测绘学院
  • 性别：男
  • 学位：工学博士学位

曾获荣誉：

  • 2021-09-272020 年度华中科技大学环境学院国祯环卫一等奖学金
  • 2023-05-15第八届地学青年地学论坛优秀学生报告奖

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