Abstract:A comprehensive experimental study was conducted to investigate a new method of NO3--N removal in a septum-free electrolysis system based on simulated wastewater, i.e. 50mg/L NO3--N. CuO modified-Ti and SnO2-Sb2O5 modified-Ti were prepared via pyrolyticprocess and adopted as cathode and anode, respectively. CuO modified-Ti cathode could work as catalyst to reduce NO3--N and the resulting rate of removal increased with the increasing in current density, space between electrodes, stirring intensity and reaction time. A high rate of removal (93.8%) was obtained when applying current density at 10mA/cm2, space between electrodes at 9mm, stirring intensity at middle-scale for 150 min. In addition, NH4+-N which was the reduction product of NO3--N could be oxidized to N2-N under the support electrolysis of Cl-. With a starting NaCl concentration at 600mg/L, current density at 10mA/cm2, space between electrodes at 9mm, stirring intensity at middle-scale for 120 min, the removal rate of NO3--N and TN is 89.3% and 86.9%, respectively, and no NO2--N or NH4+-N were detected. The NO3--N reducing mechanism may be O in NOx fixed by Cu adsorbing, then gradual reduced via reductant attacking N—O. In addition, NH4+-N oxidized to N2 due to the HOCl generation from anode electrolysis of Cl-
叶舒帆, 胡筱敏, 董俊, 张杨, 和英滇. 钛基修饰电极催化电解去除水中硝酸盐氮的研究[J]. 中国环境科学, 2011, 31(1): 44-49.
YE Shu-Fan, HU Xiao-Min, DONG Jun, ZHANG Yang, HE Ying-Dian. Catalytic electrolysis removal of nitrate in water by modified Ti substrate electrodes. CHINA ENVIRONMENTAL SCIENCECE, 2011, 31(1): 44-49.