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Degradation and detoxification mechanisms of organophosphorus flame retardant tris(1,3-dichloro-2-propyl)phosphate(TDCPP)during electrochemical oxidation process

引用

Chinese Chemical Letters 2023年第8期34卷 270-274页

作者： Shaoyu Tang Zhujun Luo Jianbo Liao Zhun Liu Lei Xu Junfeng Niu Research Center for Eco-Environmental Engineering Dongguan University of TechnologyDongguan 523808China

Electrochemical oxidation of aqueous tris(1,3-dichloro-2-propyl)phosphate(TDCPP)by using Ti/SnO_(2)-Sb/La-PbO_(2)as anode was investigated for the first time,and the degradation mechanisms and toxicity changes of the degradation intermediates were further *** suggested that electrochemical degradation of TDCPP followed pseudo-first-order kinetics,and the reaction rate constant(k)was 0.0332 min^(−1)at the applied current density of 10 mA/cm^(2)and Na_(2)SO_(4)concentration of 10 mmol/*** was better TDCPP degradation performance at higher current *** hydroxy radical(•OH)was proved to play dominant role in TDCPP oxidation via quenching experiment,with a relative contribution rate of 60.1%.A total of five intermediates(M1,C_(6)H_(11)Cl_(4)O_(4)P;M2,C_(3)H_(7)Cl_(2)O_(4)P;M3,C_(9)H_(16)Cl_(5)O_(5)P;M4,C_(9)H_(14)Cl_(5)O_(6)P;M5,C_(6)H_(10)Cl_(3)O_(6)P)were identified,and the intermediates were further degraded prolonging with the reaction *** cytometer results suggested that the toxicity of TDCPP and degradation intermediates significantly reduced,and the detoxification efficiency was achieved at 78.1%at 180 *** predictive model was used to assess the relative toxicity of TDCPP and the degradation *** EC_(50)to green algae was 3.59 mg/L for TDCPP,and the values raised to 84,574,54.6,391,and 8920 mg/L for M1,M2,M3,M4,and M5,respectively,indicating that the degradation intermediates are less toxic or not *** advanced oxidation process is a valid technology to degrade TDCPP and pose a good detoxification effect.

关键词： Electrochemical oxidation process organophosphorus flame retardants Degradation mechanisms Mineralization Detoxification

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