DING Wen-chuan,YANG Mei,ZENG Xiao-lan,et al.Degradation of Tetracyclines and Toxicity of Intermediate Products in a Thermal-activated Persulfate System[J].China Water & Wastewater,2021,37(21 21):56-63.
Degradation of Tetracyclines and Toxicity of Intermediate Products in a Thermal-activated Persulfate System
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第37卷
Number:
21 21
Page:
56-63
Column:
Date of publication:
2021-11-01
- Keywords:
- tetracyclines (TC); persulfate; thermal activation; degradation pathway; intermediate product; biotoxicity
- Abstract:
- A thermal-activated persulfate system was applied to degrade tetracyclines (TC),and the degradation kinetics, degradation mechanism and biotoxicity of the intermediate products were investigated. The degradation process of the TC was in accordance with quasi first-order kinetics, and the TC degradation mainly occurred in the former 20 min of the reaction. Increasing the temperature of the system or the molar concentration ratio of PS to TC could significantly improve the degradation rate of the TC. The degradation performance of the TC was the best under acidic condition. The speculative degradation pathways of the TC mainly included demethylation, deamination, dehydroxylation, ring opening, oxygenation and hydrolysis. In the former 40-60 min, the dehydrogenase activity inhibition rate of the intermediate products was higher than that of the original TC. Then, longer reaction time would result in a higher degree of the TC mineralization and a lower dehydrogenase activity inhibition rate of the products.
Last Update:
2021-11-01