摘要
采用溶胶-凝胶法制备了Ti O_2,并使Ti O_2负载在浮石上制备Ti O_2/浮石光催化剂。用X射线荧光光谱(XRF)、电镜扫子显微描(SEM)和傅里叶红外光谱(FT-IR)表征浮石、Ti O_2及Ti O_2/浮石。在太阳光照射下,用Ti O_2/浮石处理模拟氨氮废水,以废水中氨氮降解率为标准,考察影响氨氮降解因素。结果表明,Ti O_2成功固定在浮石表面,负载率为3.71%;废水中氨氮降解率随太阳光照射时间、废水p H值、催化剂Ti O_2/浮石含量增加而增大。当初始氨氮浓度为500 mg/L、太阳照射180 min、废水p H=11、催化剂Ti O_2/浮石剂量为20 g/L时,氨氮降解率达82.0%,氨氮除去率86.8%,降解产物中未发现污染成分NO_2^-和NO_3^-产生。催化剂再生/催化3次,每次再生后氨氮降解率约下降10.0%。该方法快速、简单、低消耗和产生二次污染少,能有效地降解废水中的氨氮。
Photocatalytic degradation of ammonia-nitrogen in simulated wastewater was investigated by the TiO2/pumice photocatalyst under solar light. TiO2 prepared photocatalyst and immobilized on porous pumice granules. To op by the sol-gel method was used as the timize the photocatalytic reaction, the effect of the initial concentration of ammonia-nitrogen, pH, reaction time and catalyst loading degradation rate were investigated in an aerated reactor. Also, the morphology on the ammonia-nitrogen and chemical structure properties of the prepared catalysts were characterized by scanning electron microscopy （SEM）, X-ray fluorescence spectrometer （XRF） and Fourier transform infrared spectroscopy （ FT-IR ） analyses. The experimental results indicate that the coating ratio of TiO2 on pumice is 3.71%; the ammonia-nitrogen degradation rate is increased by increasing the pH value, time of solar light irradiation and dose of TiO2/ pumice. After solar light irradiation for 180 min, a high degradation rate of 82. 0% and a removal rate of 86.8% are achieved under 500 mg/L ammonia-nitrogen, pH 11 and 30 g/L TiO2/pumice. Moreover, the NO2- and NO3- pollutes are not found in degradation products. The photoeatalyst can be reused at least three consecutive times with about 10. 0% decrease on the ammonia-nitrogen degradation rate. The results that the photocatalytic purification by photocatalysis is a rapid, low consumed and effective method degradation of ammonia-nitrogen in wastewater.
作者
彭炳先
王小力
刘锐涵
周爱红
PENG Bingxian WANG Xiaoli LIU Ruihan ZHOU Aihong(College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanehang 330022, China Yanbei Middle School of Yongfeng County, Ji＇an, Jiangxi 331504, China Jiangxi Diyuan Drainage and Water Quality Detection Company Limited,Nanchang 330025, China)
出处
《应用化学》
CSCD
北大核心
2017年第8期946-954,共9页
Chinese Journal of Applied Chemistry
基金
江西省科技计划项目(20141BBG70008)
江西省自然科学基金(20142BAB203020)资助~~
关键词
太阳光
光催化
二氧化钛/浮石
降解
氨氮
solar light
photocatalyst
TiO2/pumice
degradation
ammonia-nitrogen suggest for the
