Cu²⁺ 活化过碳酸钠降解偶氮染料酸性橙G的机制与原理

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关键词：酸性橙G；高级化学氧化；过碳酸钠；自由基； Cu2+ 中图分类号：X791 文献标志码：A DOI：10.3969/j.issn.1003-9015.2025.04.018

Abstract： In response to the intractable degradation issue of azo dye acid orange G（C.I. Acid Orange G） wastewater， trace amounts of Cu2+ were employed to activate sodium percarbonate （SPC） for the degradation treatment of C. I. Acid Orange G ，and the reaction mechanism and degradation principle during the degradation process were analyzed. The findings demonstrate that at an C.I. Acid Orange G concentration of 30mg⋅L-1 ，with Cu2+ and SPC dosages of 5μmol⋅L-1 and 0.2mmol⋅L-1 respectively，a 1O minutes reaction achieves a removal rate of 91.06% ，which increases to 98.39%after16 minutes.Analkaline environment is found to facilitate the degradation process，when pH=9.23，the degradation rate of 16 minutes is 99.48% ，which is 91.76% higher than that at pH= 3.19. HCO 3 exhibits significant inhibitory effects on the system，while Cl ，SO ，and NO 3 show no discernible promoting or inhibiting effects.Radical trapping experiments reveal the presence of singlet oxygen （ 1O2 ）and carbonate radicals（CO 3 ）as reactive oxygen species（ROS）within the system. Total organic carbon （TOC） analysis indicates that the system possesses mineralization capabilities，achieving a TOC removal rate of up to 46.2% after 16 minutes. Based on the results of ultraviolet-visible absorption spectroscopy and mass spectrometry，the degradation mechanism of C.I.Acid Orange G is as follows：cleavage of theazo bond，ring-opening of thebenzene ring，and oxidation of the naphthalene ring. In conclusion，it is established that the Cu2+ /SPC system effectively degrades C.I. Acid Orange G.

Key words：C.I.Acid Orange G； advanced chemical oxidation； SPC； radical； Cu2+

1前言

在纺织、造纸和印刷等行业，偶氮染料酸性橙G（C.I.Acid OrangeG）因其稳定性和多功能性而广受欢迎，但其不可生物降解、有毒且具有潜在致癌性[1]。（剩余17376字）