| Autor: |
Zheng TL; College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China., Zhang LL; College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China., Chen JB; College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China., Zhang YL; College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China., Zhou XF; College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China. |
| Jazyk: |
čínština |
| Zdroj: |
Huan jing ke xue= Huanjing kexue [Huan Jing Ke Xue] 2023 May 08; Vol. 44 (5), pp. 2635-2645. |
| DOI: |
10.13227/j.hjkx.202205214 |
| Abstrakt: |
Peracetic acid (PAA), as a new oxidant, has attracted increasing attention in the treatment of refractory organic pollution in sewage. In this study, the nano core-shell Co@NC catalyst was prepared via etching and used to activate PAA to degrade sulfamethoxazole (SMX) in sewage. The results indicated that the degradation rate of SMX reached 98%, and its reaction rate constant was 0.80 min -1 under optimal conditions (catalyst dosage=0.02 g·L -1 , PAA concentration=0.12 mmol·L -1 , pH=7, SMX concentration=10 μmol·L -1 ). With the increase in PAA concentration and core-shell Co@NC dosage, the degradation efficiency of SMX increased. The study found that the core-shell Co@NC/PAA system had the best degradation effect on SMX under near-neutral conditions (pH 6.0-8.0), and both acidic and alkaline environments were not conducive to SMX degradation. HCO 3 - and humic acid showed significant inhibition on the degradation of SMX, whereas Cl - showed weak inhibition. In addition, through a free radical quenching experiment and electron paramagnetic resonance (EPR) detection, acetoxy radical (CH 3 CO 2 CO 3 ·) were the main active species for the degradation of organic pollutants in the system. Transformation products (TPs) of SMX were analyzed by U-HPLC-Q-Exactive Orbitrap HRMS, and a possible degradation path of SMX was proposed. At the same time, the catalyst recycling experiment showed that the nano core-shell Co@NC catalyst had good stability and reusability. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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