研究报告

  • 田丹,吴玮,沈芷璇,黄天寅,陈家斌.Co(Ⅱ)活化过氧乙酸降解有机染料研究[J].环境科学学报,2018,38(10):4023-4031

  • Co(Ⅱ)活化过氧乙酸降解有机染料研究
  • Degradation of organic dyes with peracetic acid activated by Co (Ⅱ)
  • 基金项目:国家自然科学基金(No.51478283);苏州市民生科技项目(No.SS201722)
  • 作者
  • 单位
  • 田丹
  • 苏州科技大学环境科学与工程学院, 苏州 215009
  • 吴玮
  • 苏州科技大学环境科学与工程学院, 苏州 215009
  • 沈芷璇
  • 苏州科技大学环境科学与工程学院, 苏州 215009
  • 黄天寅
  • 苏州科技大学环境科学与工程学院, 苏州 215009
  • 陈家斌
  • 苏州科技大学环境科学与工程学院, 苏州 215009
  • 摘要:采用Co(Ⅱ)活化过氧乙酸(PAA)降解有机染料,主要评估了Co(Ⅱ)/PAA体系的氧化性能并考察不同因素对酸性橙(AO7)脱色的影响.结果表明:Co(Ⅱ)/PAA体系能有效脱色有机染料,其氧化能力与Co(Ⅱ)/PMS体系相当并优于Fenton体系.AO7的脱色效果随PAA和Co(Ⅱ)浓度的升高而升高,其中,[Co(Ⅱ)]0为0.01 mmol·L-1、[PAA]0/[AO7]0为4/1时,反应60 min可使92%的AO7脱色.弱酸或中性的环境有利于AO7的脱色,存在Cl-和HA时不利于AO7的脱色.采用抑制剂抗坏血酸、叔丁醇、甲醇等实验方法,推测Co(Ⅱ)/PAA体系中产生的CH3COO·和CH3COOO·是对AO7起主要降解作用的自由基.紫外可见光谱分析表明,该自由基主要攻击AO7分子中的偶氮键及萘环结构,从而达到AO7脱色效果.
  • Abstract:The degradation of organic dyes was studied by using Co(Ⅱ) activated peracetic acid (PAA). The oxidation performance of Co(Ⅱ)/PAA was evaluated and the impact of different factors on dye degradation was investigated. The results show that Co(Ⅱ)/PAA system could effectively decolorize organic dyes, and its oxidation capacity was comparable to that of Co(Ⅱ)/PMS system and was superior to that of Fenton system. Decolorization of AO7 increased with the increase of PAA or Co(Ⅱ) concentration. The decolorization rate of AO7 could reach 92% after 60 min with 0.01 mmol·L-1 of Co(Ⅱ) dosage and 4/1 of PAA/AO7 molar ratio. Weak acidic and neutral pHs were favourable for the decolorization of AO7. The presence of Cl- and HA could slightly inhibit AO7 decolorization. Using the quenchers, such as ascorbic acid, tert-butanol, and methanol, CH3COO·and CH3COOO·were speculated to be the main radicals responsible for AO7 decolorization in the Co(Ⅱ)/PAA system. Results of UV-Vis spectra analysis show that the radicals mainly attacked the azo bond and naphthalene ring structure in AO7 molecules.

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