1. School of Environment and Resource, Southwest University of Science and Technology, Mianyang 621010, China;
2. Key Laboratory of Solid Waste Treatment and Resource Recycle, Ministry of Education, Southwest University of Science and Technology, Mianyang 621010, China;
3. College of Environmental Science and Engineering, China West Normal University, Nanchong 637009, China
The effects of different humic acids (HA), including standard humic acid (SPHA), Paddy soil humic acid (SDHA), Peat soil humic acid (NTHA) and Deciduous soil humic acid (LYHA), on the photodegradation of sulfadiazine (SDZ), and corresponding contribution of primary reactive species was investigated. The results indicated that the photodegradation process of SDZ in pure water and HA solution was consistent with the first-order photodegradation kinetic model. The photodegradation of SDZ was promoted by HA, in order of promoting effects:SPHA > SDHA > NTHA > LYHA. Based on the quenching experiment of hydroxyl radical (·OH) and singlet oxygen (1O2), the capacity to produce·OH and 1O2 of HA was been influenced by its own source. Under the same conditions, the amount of·OH produced by SPHA was relatively higher, and its contribution rate to SDZ photodegradation was the largest (26.97%), while LYHA contribution was relatively smaller at 9.33%. Meanwhile, 1O2 was found to play the most important role in the photodegradation of SDZ, with the contribution rate ranging from 41.33% to 51.95%.
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