氨基三亚甲基膦酸的电化学高级氧化降解

Electrochemical advanced oxidative degradation of amino tri(methylene phosphonic acid)

为探索电化学高级氧化法对ATMP的降解效能,利用板框式电化学高级氧化装置,考察了溶液流速、温度、pH值、电流密度及Na_(2)SO_(4)浓度等关键参数对ATMP降解效果的影响;利用电子顺磁共振测试、自由基猝灭实验和ATMP降解动力学探讨了ATMP的降解机制.结果表明,溶液流速为450mL/min,温度为30℃,pH值为9,电流密度为300A/m^(2),电解质Na_(2)SO_(4)浓度为0.10mol/L时,ATMP的降解率最高,80min内可达99.7%,电化学高级氧化技术(EAOPs)能够有效降解ATMP;操作条件中电流密度、溶液流速和温度均影响ATMP降解率,但温度改变需要的能耗较高,而溶液流速对降解率影响较小,仅电流密度改变具有能耗小且对ATMP降解率影响显著的优点,因此本体系适合以电流密度作为反应的核心控制参数;研究采用的EAOPs体系产生的⋅OH(羟基自由基)和SO_(4)^(-)⋅(硫酸根自由基)均参与降解ATMP,反应速率常数分别为k_(•OH,ATMP)=(7.50±0.05)×10^(8)L/(mol·s)和k_(SO_(4)^(-)•,ATMPP)=(5.63±1.20)×10^(7)L/(mol·s),⋅OH在降解ATMP的过程中起主要作用.

The degradation efficiency of the electrochemical advanced oxidation process on ATMP was explored using a plate and frame electrochemical advanced oxidation device to investigate the effects of key parameters such as solution flow rate,temperature,pH,current density,and Na_(2)SO_(4)concentration value;The degradation mechanism of ATMP was explored using electron paramagnetic resonance testing,free radical quenching experiments,and ATMP degradation kinetics.The results showed that when the solution flow rate was 450mL/min,temperature was 30℃,pH was 9,current density was 300A/m^(2),and concentration of electrolyte Na_(2)SO_(4) was 0.1mol/L,the degradation rate of ATMP was the highest,reaching 99.7%within 80minutes,the Electrochemical Advanced Oxidation Process(EAOPs)was found to effectively degrade ATMP;In operating conditions,it was observed that changes in current density,solution flow rate,and temperature could affect the ATMP degradation rate,however,a change in temperature required high energy consumption,while the solution flow rate had little impact on the degradation rate,only a change in current density offered the advantage of low energy consumption and a significant impact on the ATMP degradation rate,therefore,this system was deemed suitable for using current density as the core control parameter of the reaction;The•OH(hydroxyl radical)and SO_(4)^(-)•(sulfate radical)generated by the EAOPs system used in this study are both involved in the degradation of ATMP,with reaction rate constants of k•OH,ATMP=(7.50±0.05)×10^(8)L/(mol·s)and kSO_(4)^(-)•,ATMP=(5.63±1.20)×10^(7)L/(mol·s),respectively,the•OH(hydroxyl radical)was found to play a major role in the degradation of ATMP.