Ti/SnO_2-Sb_2O_5-CuO电极制备及其降解模拟高盐印染废水中氨氮的研究

本文采用热分解法制备了Ti/SnO_2-Sb_2O_5-CuO电极,通过SEM、极化曲线及强化寿命测试对电极性能进行检测分析。研究发现相较于Ti/Sn O2-Sb2O5电极,Ti/SnO_2-Sb_2O_5-CuO电极表层更加致密,析氧电位更高,析氯电位更低,电极强化寿命更长。以模拟高盐印染废水中铵态氮作为研究对象,考察了Ti/SnO_2-Sb_2O_5-CuO电极的降解性能,结果表明:50 mg/L氨氮,氯离子浓度10 g/L,氨氮的降解速率和去除效率随氯离子浓度的增加而增加;氯离子浓度≥10 g/L,继续增加氯离子浓度,降解速率和去除效率无明显变化;在2~10 m A/cm2范围内,增加电流密度,降解速率加快,但氨氮的去除率变化不大;Ti/SnO_2-Sb_2O_5-CuO电极对氨氮的去除率可达90%以上,废水中氨氮浓度能降低到3 mg/L以下,达到印染废水的国家排放标准。

Preparation of Ti/SnO2-Sb2O5-CuO Electrode and Its Application in NH3-N Removal in Simulated High Concentration Salt Dyeing Wastewater

Ti/SnO2-Sb2O5-CuO electrode was prepared by thermal decomposition and was characterized through scanning electron microscopy(SEM), linear sweep voltammetry and strengthening life test. It was indicated that Ti/SnO2-Sb2O5-CuO electrode had more compact microstructure, higher oxygen evolution potential, lower chlorine evolution potential, and longer strengthening life than Ti/SnO2-Sb2O5 electrode. Ti/SnO2-Sb2O5-CuO electrode for electro-oxidation degradation of ammonium in simulated high concentration salt dyeing wastewater was systematically investigated. The results showed that the efficiency of NH3-N removal rose with increasing Cl- concentration, when Cl- concentration was less than 10 g/L. When Cl-concentration is higher than 10 g/L, there was no signiifcant change in the efifciency of NH3-N removal. The efifciency of NH3-N removal had not changed obviously. In experimental conditions, NH3-N removal efifciency was over 90%, and NH3-N concentration was less than 3 mg/L.