电催化强化对布洛芬的去除效果及机制

对比研究了O₃ + H₂O₂电催化、 O₃电催化和H₂O₂电催化这3种电催化强化体系对水中难降解污染物布洛芬的去除效果，并且进一步阐明了布洛芬的降解机制。结果表明：经30 min反应后，3种电催化强化体系对布洛芬的去除率分别达到93.2%、84.5%和52.7%，均高于在单独电催化条件下的去除率(46.2%)。尺度排阻色谱-紫外分析结果表明3种电催化强化体系对大分子(28 800 Da)和小分子(2 900 Da)有机污染物均有较好的去除作用。腐殖酸的存在会显著降低布洛芬的去除率。荧光光谱分析结果表明，类腐殖酸和溶解性微生物副产物是限制布洛芬去除的主要原因。硬度离子的存在对布洛芬去除影响较大，在CaCO₃的质量浓度为15 mg·L ⁻¹时，O₃ + H₂O₂体系对水中布洛芬的去除率相比去离子水溶液时下降了26.6%。研究阐明了布洛芬的降解路径，布洛芬在降解过程中产生了13种中间产物，反应中通过脱羧、脱甲基等一系列反应，最终将污染物氧化为CO₂和H₂O。

Removal effect and mechanism of ibuprofen by enhanced electrocatalysis

In this study, the performance of O3+H2O2 enhanced electrocatalysis, O3 enhanced electrocatalysis and H2O2 enhanced electrocatalysis on ibuprofen removal from water was compared, and the degradation mechanism was analyzed. The results showed that after 30 min reaction, the removal rates of ibuprofen by these three types of enhanced electrocatalysis were 93.2%, 84.5% and 52.7%, respectively, which were higher than 46.2% by electrocatalysis alone. The three enhanced electrocatalysis systems had good removal effects on macromolecular (28 800 Da) and small molecular (2 900 Da) pollutants detected by size exclusion chromatography-UV. Humic acid in water significantly reduced the removal effect of ibuprofen. Fluorescence spectrum analysis showed that the humic acid like and soluble microbial by-products were the main reason for restricting ibuprofen removal. The hardness of water significantly reduced the removal efficiency of ibuprofen. The removal rate of ibuprofen by O3+H2O2 enhanced electrocatalysis decreased by 26.6% at the 15 mg·L−1 CaCO3 in comparison with that in deionized aqueous background solution. The degradation path of ibuprofen was clarified, 13 intermediate products were produced during the degradation process of ibuprofen. In the reaction, the ibuprofen was finally oxidized to CO2 and H2O through a series of reactions such as decarboxylation and demethylation.