摘要
采用水热技术制备了铁掺杂TiO_2光催化剂,并用SEM、XRD、FT-IR对其进行了表征;以紫外灯(λ=254 nm)作为光源、酸性刚果红为目标降解物进行光催化性能的研究。SEM表征结果:自制的催化剂粉末由直径为2～3μm的TiO_2微米球形成,各微米球由八面体型的TiO_2纳米晶体(晶体长度1.0～1.5μm)自组装所成,形成八面体的三角形边长200 nm左右。XRD表征结果说明:所得光催化剂粉末为锐钛矿相TiO_2(即A-TiO_2),在其3种晶相中(锐钛矿相、金红石相和板钛矿相)中有最好的光催化性能。FT-IR结果表明:所制的TiO_2结构中存在大量的—OH,预计它有较高的光催化活性。光催化实验表明:掺杂离子提高了TiO_2光催化性能,Fe^(3+)掺杂量为6%(摩尔分数,下同)的TiO_2的光催化性能最好;在室温下,催化剂加用量1.2 g/L、降解时间10 min时,对60 mg/L酸性刚果红溶液(pH=6)的降解率达到82.73%。
Fe-doping TiO2 photocatalyst was prepared using hydrothermal method. The samples were characterized by means of SEM , XRD and FT-IR. The photocatalytic performance of TiO2 samples was studied using ultraviolet lamp(λ=254 nm) as illumination device and acidic Congo red as stimulant pollutant. The SEM results show that TiO2 crystal powders are formed by TiO2 microspheres(diameters are 2~3μm), which are a large scale self-assembly of octahedral TiO2 nanocrystals(each nanocrystal's length is 1.0~1.5μm), and individual TiO2 octahedron has triangle planes about 200 nm inside.The XRD results indicate that the as-prepared titanium dioxide is anatase crystal(i.e.A-TiO2), that is , which has the best photocatalytic activity among TiO/s three kinds crystal types(anatase,rutile and brookite).The results of FT-IR show that there are a lot of--OH groups in as-prepared TiO2 nano-particles. Photocatalytic experiment for degradation of acidic Congo red showed that Fe3 doping to TiO2 improved the photocatalytic performance of TiO2 samples. In the doping samples, 6%(molar fraction) Fe-TiO2 was the most active. When at the room temperature,the degradation rate of reactive acidic Congo red whose initial con-centration is 60 mg/L( pH=6) could reach 82.73% by catalyst of 1.2 g/L in 10 min.
作者
张一兵
谢丽丽
Zhang Yibing;Xie Lili(School of Chemistry and Environmental Science,Shangrao Normal University,Jiangxi Shangrao 334001,China;Jiangxi Province Key Laboratory of Polymer Preparation and Processing,Jiangxi Shangrao 334001,China)
出处
《化学工业与工程》
CAS
CSCD
2019年第2期28-33,共6页
Chemical Industry and Engineering
基金
教育部第四批高等学校特色专业建设点资助项目(TS11524)
江西省精品课程资助项目(赣教高字[2011]74号)
江西省精品资源共享课资助项目(赣教高字[2015]79号)
关键词
铁掺杂TiO2
水热法
光催化降解
酸性刚果红
Fe^3+-doping TiO2
hydrothermal method
photocatalytic degeneration
acidic Congo red
