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以Keggin型缺位杂多阴离子PW11O397-(PW11)为电催化剂,硝基苯(NB)为模型污染物,研究了Na2SO4-NaHSO4介质中PW11O397-对NB的电催化降解作用.实验结果表明,在pH=2.5,E=-0.6V和O2流速为60mL·min-1的条件下,初始浓度为0.5mmol·L-1的硝基苯反应80min即完全降解,反应120min总有机碳(TOC)去除达42%.硝基苯的电催化降解服从准一级反应动力学模型,室温下其表观速率常数kobs的大小与NB的初始浓度有关,当NB的初始浓度为0.5,0.9和1.3mmol·L-1时,kobs值分别为1.0×10-1,6.0×10-2和4.1×10-2min-1.
The electrocatalytic degradation of NB11 by PW11O397- in Na2SO4-NaHSO4 medium was studied by using Keggin vacancy heteroplasmic PW11O397- (PW11) as electrocatalyst and nitrobenzene (NB) as model pollutants. The experimental results showed that under the conditions of Under the conditions of pH = 2.5, E = -0.6 V and O2 flow rate of 60 mL · min-1, the nitrobenzene with the initial concentration of 0.5 mmol·L-1 was completely degraded after 80 min reaction, and the total organic carbon (TOC) Up to 42% .The electrocatalytic degradation of nitrobenzene obeys the quasi-first-order reaction kinetics model. The apparent kobs’ size at room temperature is related to the initial concentration of NB. When the initial concentration of NB is 0.5, 0.9 and 1.3 mmol · L-1, kobs values were 1.0 × 10-1, 6.0 × 10-2 and 4.1 × 10-2min-1, respectively.