缺位磷钨杂多阴离子PW_(11)O_(39)^(7-)电催化降解邻苯二甲酸二甲酯

Electrocatalytic Degradation of Dimethyl Phthalate with Lacunary Heteropolyanion PW_(11)O_(39)^(7-)

以Keggin型缺位磷钨杂多阴离子PW11O379-(PW11)为电催化剂,邻苯二甲酸二甲酯(DMP)为模型污染物,详细研究了PW11对DMP降解的电催化作用。实验结果表明,在pH=2.5,E=-0.6 V和60 mL.min-1O2流速下,0.05 mmol.L-1DMP反应120 min的降解率达96%,总有机碳(TOC)去除约34%。DMP的电催化降解服从准一级反应动力学模型,准一级表观速率常数(kobs)与DMP的初始浓度有关,当DMP的初始浓度为0.05,0.2和0.3 mmol.L-1时,kobs分别为2.9×10-2,7.5×10-3和4.9×10-3min-1。

The electrocatalytic degradation of disruptors dimethyl phthalate （ DMP）, using lacunary het- eropolyanion PW11O39^7- as an indirect electrocatalyst, was investigated in this work. The results indicated that 96% of DMP degradation was obtained in less than 120 min in Na2SO4 - NaHSO4 solution （pH 2.5 ） containing 0. 05 mmol·L^-1 DMP at the potential of -0. 6 V and the O2 flow rate of 60 mL min^-1. A total organic carbon （TOC） removal reached 34% at 120 min. The DMP degradation reaction follows the pseudo-first order kinetic regime and the observed rate constants （kob8 ） related to the initial DMP concentration were determined to be 2. 9 × 10^ -2 7.5 × 10^-3and 4. 9 × 10^ -3min^-1 at the initial DMP concentration of 0. 05, 0. 2 and 0. 3 mmol·L^-1, respectively.