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Citation: LI Jibin, ZHAO Zhengya, LI Naixuan. Catalyzed Oxidative Degradation of Pesticide Dichlorvos by Cobalt meso-Tetrakis(4-sulfonatophenyl) porphyrin/Sodium Persulfate-Hydrogen Peroxide System[J]. Chinese Journal of Applied Chemistry, ;2011, 28(9): 1035-1040. doi: 10.3724/SP.J.1095.2011.00577 shu

Catalyzed Oxidative Degradation of Pesticide Dichlorvos by Cobalt meso-Tetrakis(4-sulfonatophenyl) porphyrin/Sodium Persulfate-Hydrogen Peroxide System

1.
Chemistry and Chemical Engineering College, Tianjin University of Technology, Tianjin 300384

Corresponding author: LI Naixuan,
Received Date: 30 September 2010
Available Online: 9 February 2011
Fund Project: 教育部大学生创新性实验计划(DCSJ08-013) (DCSJ08-013)

The degradation efficiency of dichlorvos(DDVP) pesticide was conducted using a mixture of hydrogen peroxide and sodium persulfate, catalyzed by cobalt meso-tetrakis(4-sulfonatophenyl) porphyrin(CoTPPS₄). Influencing factors on degradation ratio of dichlorvos were discussed, such as oxidant species, mixing ratio between oxidants, amount of additional catalyst, initial concentration of pesticide, pH value and temperature. Reaction kinetics of degradation reaction under optimized conditions was also studied. The degradation rate increased with the increases of catalyst dosage, pH(5~9) and reaction temperature as well as the decrease of initial concentration of pesticide. The results indicated that the degradation rate of 1.015 mol/L DDVP can reach to 72.8% after 7 h, when an additional volume of mixed oxidants of Na₂S₂O₈ and H₂O₂(4/1, volume ratio) with 0.050 mol/L is 5 mL, the catalyst dosage is 2.4×10^-3 g at pH=9, rate constant is 0.190 h^-1. Kinetic studies suggest that the catalyzed oxidative degradation of dichlorvos is a pseudo-first-order reaction with the activation energy E_a of 5.052 kJ/mol.
- sodium persulfate,
- catalytic degradation,
- dichlorvos,
- activation energy
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