欢迎访问《环境科学学报》编辑部网站！

快速检索			高级检索

研究报告

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.