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| Chemical Oxidation Degradation of Thiamethoxam in Fe2+/S2O2-8/ S2O2-3 Aqueous Solution |
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| KeyWord:thiamethoxam; single factorial experiment; central composite experiment; chemical oxidation degradation |
| Author Name | Affiliation | | YANG Hai | College of Chemistry and Chemical Engineering, Hunan Institute of Engineering, Xiangtan 411104, China | | PANG Huai-lin | National Engineering Research Center for Agrochemicals，Hunan Research Institute of Chemical Industry，Changsha 410007, China | | TAN Xiao-jun | College of Chemistry and Chemical Engineering, Hunan Institute of Engineering, Xiangtan 411104, China | | HU Zhi-bin | National Engineering Research Center for Agrochemicals，Hunan Research Institute of Chemical Industry，Changsha 410007, China | | ZHANG Wen-qiang | College of Chemistry and Chemical Engineering, Hunan Institute of Engineering, Xiangtan 411104, China | | PENG Jia-yun | College of Chemistry and Chemical Engineering, Hunan Institute of Engineering, Xiangtan 411104, China | | YI Bing | College of Chemistry and Chemical Engineering, Hunan Institute of Engineering, Xiangtan 411104, China |
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| Abstract: |
| Thiamethoxam, one of neonicotinoid insecticides, is characterized with low soil sorption and high water solubility, making it a potential contaminant of surface and underground water. Here we examined the chemical oxidation degradation of thiamethoxam in Fe2+/S2O2-8/ S2O2-3 aqueous solution. The results showed that the degradation efficiency of thiamethoxam was 99.9% after 240 min reaction. The oxidizing ability of Fe2 /S2O2-8/S2O2-3 was significantly affected by the concentrations of Fe2 , S2O2-8 and S2O2-3. Three ion interactions experiment by the central composite design（CCD） showed that the optimum ratios for Fe2 /S2O2-8/S2O2-3 system were 0.69 mmol·L-1 Fe2 , 0.69 mmol·L-1 S2O2-3and 3.29 mmol·L-1 S2O2-8. Higher degradation efficiency was observed at pH=9.0. Thiamethoxam degradation was reduced by higher concentrations of substrate and presence of reactive oxidative species scavengers. |
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