电沉积多孔铜电极作阴极电芬顿降解对硝基苯酚

Degradation of p-nitrophenol with electro-Fenton by a new three-dimensional copper electrode as cathode

使用电芬顿法处理对硝基苯酚(PNP)废水过程中,提升阴极反应面积可提升降解率。采用分段电沉积方法在铜基材表面制备了多孔结构铜电极,提高电极活性面积。对电极的电化学活性面积与PNP降解率、PNP降解阻力进行了比较,电化学活性面积最大的多孔铜电极表现出最小的PNP降解阻力和最大的降解率。以电化学活性面积最大的多孔铜电极为阴极,考察了电芬顿体系中反应时间、电流密度、Fe^(2+)浓度、pH对PNP降解效果的影响。Fe^(2+)为0.1 mmol/L,pH为3,电流密度为10 mA/cm^(2),降解500 mL、50 mg/L的PNP,2 h后降解率最高可达40.3%,并且电极在连续10 h的5次循环试验中表现出良好的稳定性和催化活性。

Increasing the electrochemical active surface area ECSA of Electro-Fenton cathode can effectively enhance the p-nitrophenol(PNP) degradation rate. In this work, porous electrodeposited copper electrodes with different ECSA were prepared on the plate surface of copper substrate using segmented electrodeposition method. The results of PNP degradation rate and the resistance of PNP degradation reaction showed that the electrodeposited porous copper electrode with the maximum ECSA performs the best among the tested electrodes. Using the porous copper electrode with the maximum ECSA as the cathode, the optimal Electro-Fenton reaction time, current density, Fe^(2+)concentration and pH on PNP degradation were investigated. In a 500 mL waste solution with PNP concentration of 50 mg/L, a maximum degradation rate of 40.3% was obtained after 2 hours degradation at 10 mA/cm^(2) and pH=3 with 0.1 mmol/L Feaddition. The electrode also showed good stability and catalytic activity in a 5 cycles of 10 hours continuous test.