研究报告

  • 周高峰,周润宇,刘义青,张李,张琳悦,付永胜.零价钴活化过氧乙酸降解水中罗丹明B的研究[J].环境科学学报,2022,42(11):47-55

  • 零价钴活化过氧乙酸降解水中罗丹明B的研究
  • Degrdation of rhodamine B by peracetic acid activated with zero-valent cobalt
  • 基金项目:四川省科技计划项目(No.2021YJ0385)
  • 作者
  • 单位
  • 周高峰
  • 西南交通大学地球科学与环境工程学院,成都 611756
  • 周润宇
  • 西南交通大学地球科学与环境工程学院,成都 611756
  • 刘义青
  • 西南交通大学地球科学与环境工程学院,成都 611756
  • 张李
  • 西南交通大学地球科学与环境工程学院,成都 611756
  • 张琳悦
  • 西南交通大学地球科学与环境工程学院,成都 611756
  • 付永胜
  • 西南交通大学地球科学与环境工程学院,成都 611756
  • 摘要:采用零价钴(ZVCo)活化过氧乙酸(PAA)降解水中罗丹明B(RhB),探究了ZVCo/PAA体系中PAA的活化机理,并通过自由基淬灭实验,识别了体系中的主要活性自由基.同时,考察了溶液初始pH值、PAA浓度、ZVCo投加量及水中常见阴离子对ZVCo/PAA体系降解RhB的影响,并评估了ZVCo在活化PAA过程中的稳定性和可重复利用性.最后,研究了RhB在ZVCo/PAA体系中的降解机理.结果表明,在中性条件下, 大约98.3%的RhB可以在180 s内被ZVCo/PAA体系有效去除.在该体系中,ZVCo原位生成的Co2+对PAA活化起到了主要作用,有机自由基(CH3C(O)O?和CH3C(O)OO?)是该体系的主要活性物种.增加ZVCo投加量或PAA浓度可以提高RhB的降解效率,但过量的PAA对RhB的 去除有抑制作用.SO42-、NO3-和Cl的存在几乎不影响ZVCo/PAA体系降解RhB,而HCO3-能够显著抑制RhB的去除.在重复使用4次后,ZVCo仍对PAA具有良好的活化效果,且其表面形貌和元素组成均未发生明显变化,表明ZVCo具有优异的稳定性和可重复利用性.RhB在ZVCo/PAA体系中的主要降解途径为其分子结构中共轭氧杂蒽基团的破坏.
  • Abstract:Zero-valent cobalt activated peracetic acid (ZVCo/PAA) was applied in the degradation of rhodamine B (RhB) in this study. The activation mechanism of PAA in ZVCo/PAA system was explored and the dominant reactive species for RhB degradation in this system was identified via radical scavenging experiments. The effects of initial pH, PAA concentration, ZVCo dosage and common water matrix on RhB degradation in this system were investigated. The stability and reusability of ZVCo in PAA activation were also evaluated in this study. Finally, the possible degradation mechanism of RhB was investigated in ZVCo/PAA system. The results showed that about 98.3% RhB could be removed by ZVCo/PAA under neutral condition in 180 s. Co2+ generated from ZVCo in situ was primarily responsible for PAA activation and organic radicals (i.e., CH3C(O)O? and CH3C(O)OO?) were the dominant reactive species for RhB degradation in this system. Increasing PAA concentration or ZVCo dosage could enhance RhB degradation, while excess PAA inhibited its removal. The addition of SO42-, NO3- or Cl- had a negligible effect on RhB degradation, while an obvious inhibition was observed in the presence of HCO3-. ZVCo still presented an excellent ability for PAA activation to remove RhB after 4 cycles and a negligible variation on its morphology and elemental composition was observed, indicating its good stability and reusability. The destruction of conjugated xanthene structure was the main degradation pathway of RhB in ZVCo/PAA system.

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