YANKai,CHENGXue-jian,CUIXin-xin,et al.Catalyst Oxidation of NSAIDs in Aqueous Solution by O3/Pr-Al2O3[J].China Water & Wastewater,2023,39(3):73-79.
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Catalyst Oxidation of NSAIDs in Aqueous Solution by O3/Pr-Al2O3

China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU] volume: 第39卷 Number: 第3期 Page: 73-79 Column: Date of publication: 2023-02-01
Author(s):
YAN　Kai1;  CHENG　Xue-jian2;  CUI　Xin-xin2;  TAN　Chao-qun2
（1. Jiangsu Environmental Protection Group Co. Ltd.， Nanjing 210009， China； 2. School of Civil Engineering， Southeast University， Nanjing 211189， China）
Keywords:
non-steroidal anti-inflammatory drugs;  catalytic ozonation;  hydroxyl radical;  pseudo-first-order kinetics
Abstract:
A novel ozone catalyst (Pr-Al2O3) was prepared through impregnation-roasting method by loading rare earth praseodymium (Pr) on activated alumina (γ-Al2O3), and the performance and mechanism of the O3/Pr-Al2O3 system for the removal of typical non-steroidal anti-inflammatory drugs (NSAIDs) aspirin (ASA) and phenacetin (PNT) in water were explored. The degradation process of the two drugs conformed to the pseudo-first-order kinetic model. The degradation rate of the drugs increased with the increase of pH value, and it increased first and then decreased with the increase of Pr loading concentration or catalyst dosage. The maximum pseudo-first-order kinetic constants (kobs) for degradation of PNT and ASA by the O3/Pr-Al2O3 system were obtained (0.130 0 min-1 and 0.085 8 min-1) when the Pr loading concentration was 5%, the catalyst dosage was 5 g/L, the initial ozone concentration was 1.0 mg/L and the pH was 8.0. The alcohol inhibition experiment showed that the catalyst improved the ozone degradation efficiency due to the synergistic effect of adsorption and oxidation, and the hydroxyl radical (·OH) generated by catalytic ozonation played a major role in the drug removal. When the pH was 7.0, the contribution rate of ·OH to ASA and PNT degradation was 73.3% and 72.1%, respectively. The catalyst maintained high performance after being recycled 5 times, and the removal rate of ASA and PNT were up to 82.4% and 100% respectively within 30 min. Therefore, Pr-Al2O3 is a catalyst with excellent catalytic performance and high stability.
Last Update: 2023-02-01