水热合成纳米NiFe_2O_4的光催化性能

Photocatalytic Properties of Nano-NiFe_2O_4 Synthesized by Hydrothermal Method

利用水热法在160℃下反应8 h后合成纳米NiFe2O4粉体。利用X射线衍射(XRD)、透射电镜(TEM)等对样品进行表征,测试了样品对B-GFF黑、K-GL翠蓝、B-RN蓝等活性染料的光催化性能,研究了光源、初始染料浓度、光照时间及催化剂的回收等对染料降解率的影响。结果表明,制备的NiFe2O4粉体为圆形晶粒,平均粒径在15 nm左右。无光照条件下,NiFe2O4对三种活性染料有一定的催化降解。氙灯照射6 h后,NiFe2O4对B-GFF黑、B-RN蓝及K-GL翠蓝分别可达到93%、85%及58%以上的降解。紫外灯照射效果最好,紫外光照2 h后,该催化剂对B-GFF黑及B-RN蓝基本可达到100%的降解,对K-GL翠蓝也可达到75%的降解。回收后的NiFe2O4催化剂对B-GFF黑溶液仍具有75%的降解率。

Nano-NiFe2O4 was prepared by hydrothermal method synthesized at 160 ℃ for 8 h.The sample was characterized by X-ray diffraction and transmission electron microscopy.The sample photocatalytic activity was studied by probing the degradation date of reactive dyes including Black B-GFF,Turquoise Blue K-GL and Blue B-RN.The effects of light source,initial dyes concentrations,illumination time and reclaimed catalyst on degradation rate of dyes were also investigated.The results show that the NiFe2O4 powers as-prepared were circled shape and the average grain size of the powders was about 15 nm.All the dyes could be partly degraded by NiFe2O4 without illumination.After irradiation 6 h with xenon lamp,the Black B-GFF,Blue B-RN and Turquoise Blue K-GL could be degraded to above 93%,85% and 58%,respectively.While under the UV light irradiation,the NiFe2O4 catalyst have the highest photodegradation activity,the degradation rates of Black B-GFF and Blue B-RN may achieve nearly 100% after 2 h illumination,also,the degradation rate of Turquoise Blue K-GL could reach 75%.In addition,with reclaimed NiFe2O4 catalyst,the degradation rate of Black B-GFF was 75%.