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| Photochemical degradation of sulfamethazine in aqueous solution |
| Received:August 28, 2015 |
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| KeyWord:sulfamethazine(SM2);photolysis;pH;initial concentration;humic acid(HA) |
| Author Name | Affiliation | E-mail | | CHEN Wei | College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua 321004, China | | | CHEN Xiao-yang | Institute of Environmental Resource & Soil Fertilizer, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China | | | YU Hai-ying | College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua 321004, China | yhy@zjnu.cn |
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| Abstract: |
| As an emerging contaminant, sulfamethazine(SM2) has been widely detected in environmental waters. Investigating the environmental photochemical behavior of SM2 in aqueous solution is of great significance for understanding its environmental fates and ecological effects. In this study, the effects of light sources, initial concentrations, pH and humic acids on the photochemical degradation of SM2 in aqueous solution were investigated. Results indicated that the photolysis of SM2 followed pseudo-first-order kinetics equation, and the photolytic rate constants of SM2 under different light sources were significantly different, k(300 W ML>k(1000 W XL). Under the same photolysis conditions, its photolytic rate constants decreased with increasing initial SM2 concentrations. The solution pH significantly influenced the photolysis rates of SM2. With the irradiation of 300 W ML, humic acid(HA) and fulvic acid(FA) could inhibit SM2 photolysis, and the inhibitory effects became more obvious at increased concentrations of HA or FA, mainly because of masking effect of light. The inhibitory effect of HA on SM2 photolysis was greater than that of FA. |
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