摘要
针对水体中较为严重的氨氮污染问题,结合光催化氧化技术在污水处理方面的应用前景,提出以P25为催化剂,光催化降解模拟氨氮废水.讨论了降解体系中P25用量、pH值、不同初始浓度及外加氧化剂H2O2、水体中各种阴阳离子Cl-、HCO3-、NO3-、SO42-、Na+、K+、Ca2+、Mg2+对降解氨氮废水的影响.实验结果表明:在500 W汞灯的照射下,对于100 mg/L的含NH3-N废水,当P25用量为0.5 g/L、氨氮废水初始pH=10.1、H2O2投加量为2 mmol/L、氨水的浓度为100 mg/L时,去除率最高;Cl-、HCO3-、NO3-、SO42-、Na+、K+、Ca2+、Mg2+对氨氮废水的去除效果有抑制作用.证明了P25对氨氮废水的降解有一定的效果.
P25 TiO2 is applied to the photocatalytic degradation of ammonia-nitrogen wastewater to treat ammonia-nitrogen polluted water. The effects P25 dosage, pH value of reaction solution, initial concentration of ammonia-nitrogen, additional oxidant of H2O2 and common ions（Cl^-, HCO3^-, NO3^-, SO4^2-, Na^＋, K^＋, Ca^2＋, Mg^2＋）in the water on removing ammonia-nitrogen are discussed. The optimum factors to ammonia-nitrogen（100 mg/L） degradation under the irradiation of 500 W lamp are 0.5 g/L of P25, initial pH 10.1 and 2 mmol/L of H2O2, and the removal efficiency is up to 59.4 %. In addition, ions of Cl^-,HCO3^-,NO3^-,SO4^2-,Na^＋,K^＋,Ca^2＋and Mg^2＋all inhibit the degradation of ammonia-nitrogen. This study indicates that P25 has the photocatalytic ability to degrade ammonia-nitrogen in water.
出处
《有色金属科学与工程》
CAS
2015年第3期100-104,共5页
Nonferrous Metals Science and Engineering
基金
"十二五"国家科技支撑计划项目(2012BAC11B07)
教育部新世纪优秀人才支持计划(NCET-10-0183)
江西省主要学科与技术带头人培养对象计划项目(2010DD01200)
"赣鄱英才555工程"领军人才培养计划项目
关键词
P25二氧化钛
光催化处理
氨氮废水
P25 TiO2
photocatalytic treatment
ammonia-nitrogen wastewate
