XULing,DUEr-deng,FENGXin-xin,et al.Degradation of Typical Organic Sunscreen by UV/H2O2/O3 Process[J].China Water & Wastewater,2023,39(3):80-87.
Degradation of Typical Organic Sunscreen by UV/H2O2/O3 Process
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第39卷
Number:
第3期
Page:
80-87
Column:
Date of publication:
2023-02-01
- Keywords:
- UV/H2O2/O3 process; organic sunscreen; 2; 4-dihydroxybenzophenone (UV-0); response surface model; degradation mechanism
- Abstract:
- Organic sunscreen is an emerging pollutant and has attracted much attention because of its environmental safety risk. UV/hydrogen peroxide/ozone process (UV/H2O2/O3 ) was used to degrade the typical organic sunscreen 2,4-dihydroxybenzophenone (UV-0). The experiments were conducted based on the central combination design method to investigate the influencing factors and explore the degradation mechanism. When the experimental conditions were as follows: H2O2 concentration of 340 μmol/L, UV-0 initial concentration of 5 mg/L, UV intensity of 170 μW/cm2 and O3 flow rate of 0.38 L/min, the degradation rate of UV-0 reached 99.9%, and the reaction rate constant was 0.570 7 min-1 within 20 min, indicating that good degradation performance was obtained. The response surface model simulated and predicted the experimental results well, which could further explore the reaction space. The factors such as H2O2 concentration, UV intensity and O3 flow rate affected the degradation efficiency. According to the high-resolution mass spectrometry and quantum chemical structure analysis, the hydroxyl addition reaction first occurred at the C10 position to form hydroxyl and dihydroxyl addition products, and then form oxalic acid and other small molecular acids through carbon-carbon bond breaking and aromatic cracking in the process of UV-0 degradation. UV/H2O2/O3 process is easy to be applied to the upgrading of existing wastewater treatment plants, and has potential application in advanced wastewater treatment.
Last Update:
2023-02-01