摘要
采用溶胶-凝胶法制备了比表面积为73.69 m^(2)·g^(-1)和中位粒径(D_(50))为1.134μm的TiO_(2)光催化剂,通过添加La、Ce、Pr、Nd、Gd等稀土元素对TiO_(2)光催化剂进行改性。运用XRD、BET、粒度和氨氮分析等表征手段,考察了稀土离子掺杂、催化剂加入量、H_(2)O_(2)加入量和紫外光照时间等因素对TiO_(2)光催化处理稀土冶炼氨氮废水的影响。结果表明,稀土离子掺杂可有效提高TiO_(2)光催化处理氨氮废水的能力。在最佳光催化工艺条件下,添加La、Ce元素样品的氨氮去除率均达到80%以上,氯化铵废水中的氨氮浓度可显著降至14 mg/L,达到了稀土工业污染物排放标准中新建企业氨氮限值要求(15 mg/L)。
TiO_(2)photocatalyst with a specific surface area of 73.69 m^(2)·g^(-1)and a median particle size(D_(50))of 1.134μm was prepared by sol-gel method.It was modified by adding rare earth elements such as La,Ce,Pr,Nd and Gd.The effects of rare earth ions doping,catalyst dosage,H_(2)O_(2)dosage and UV irradiation time on photocatalytic treatment of ammonia nitrogen wastewater from rare earth smelting by TiO_(2),were investigated by means of XRD,BET,particle size and ammonia nitrogen analysis.The results show that rare earth ions doping can effectively improve the ability of TiO_(2)photocatalytic treatment of ammonia nitrogen wastewater,in which the removal rate of ammonia nitrogen by adding La and Ce samples can reach more than 80%,and the concentration of ammonia nitrogen in NH_(4)Cl wastewater can be reduced to 14 mg/L,which meets the requirements of the emission standard of rare earth industrial pollutants for new enterprises(15 mg/L).
作者
赵文怡
王东杰
朱悦然
申孟林
张翼明
ZHAO Wen-yi;WANG Dong-jie;ZHU Yue-ran;SHEN Meng-lin;ZHANG Yi-ming(State Key Laboratory of Baiyunobo Rare Earth Resource Researches and Comprehensive Utilization,Baotou Research Institute of Rare Earths,Baotou 014030,China;School of Chemical Engineering&Technology,Tianjin University,Tianjin 300350,China)
出处
《稀土》
CAS
CSCD
北大核心
2022年第1期106-112,共7页
Chinese Rare Earths
关键词
TIO
光催化
氨氮废水
氨氮去除率
稀土
TiO_(2)
photocatalysis
ammonia nitrogen wastewater
ammonia nitrogen removal rate
rare earth
作者简介
赵文怡(1983-),女,内蒙古包头人,硕士,高级工程师,主要从事稀土湿法冶金及稀土催化材料的研究,E-mail:wenyi_zhao@tju.edu.cn
