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Enhancement of S(IV)-Cr(VI) reaction in p-nitrophenol degradation using rice husk biochar at neutral conditions

发布时间：2024-09-28点击次数：

  • DOI码：10.1016/j.scitotenv.2020.142086
  • 发表刊物：Science of the Total Emvironment
  • 关键字：Biochar; Cr(VI) reduction; O2 activation; PNP degradation; Sulfite activation
  • 摘要：In this study, biochar R550, obtained from rice husk charred at 550 °C, was used to detoxify Cr(VI) and organic pollutant p-nitrophenol (PNP) with the cooperation of sulfite, simultaneously. Cr(VI) was mainly reduced by sulfite, and the reduction was accelerated by biochar. Also, the reactive oxygen species formed in-situ as a result of enhanced oxidation of sulfite with Cr(VI)/R550 system and the activation of O2 by R550, led to the degradation of PNP. Production of the radicals viz., SO3[rad]−, SO4[rad]− and [rad]OH was followed by Electron Paramagnetic Resonance (EPR) study, and the predominant role of SO4[rad]− towards PNP degradation was confirmed by radical quenching tests. The reaction completed biochar sample was undergone the X-ray photoelectron spectroscopy (XPS) and Fourier Transform Infrared Spectroscopy (FTIR) spectral analysis, which suggested that the carboxyl group of the biochar triggered and enhanced the reactivity of Cr(VI) via coordination linkage, which in turn activated the sulfite and converted the SO32− into SO4[rad]− to a higher extent by overcoming the undesirable transformation of SO32− to SO42−. Such results could also be verified by the other three biochar (Oxi-R550, H-R550, and R800). The results of the present study shed light on the mechanism of biochar mediated sulfite activation process by Cr(VI) and also assured the viability and green approach of the technique in detoxifying the industrial effluents containing Cr(VI) and organic pollutants
  • 论文类型：期刊论文
  • 论文编号：142086
  • 学科门类：工学
  • 一级学科：环境科学与工程
  • 文献类型：J
  • 卷号：749
  • ISSN号：0048-9697
  • 是否译文：否
  • 发表时间：2020-12-20
  • 收录刊物：SCI

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上一条：Photochemistry of biochar during ageing process: Reactive oxygen species generation and benzoic acid degradation

下一条：Simultaneous reduction of Cr(VI) and oxidization of organic pollutants by rice husk derived biochar and the interactive influences of coexisting Cr(VI)

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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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