Nd-Er/ZnO-TiO_2光催化剂对2,4-DCP的光催化降解研究

Study on photocatalytic degradation of 2,4-dichlorophenol over Nd-Er/ZnO-TiO_2

以六水合硝酸锌[Zn(NO_3)_2·(H_2O)_6]、六水合硝酸钕[Nd(NO_3)_3·6H_2O]和五水合硝酸铒[Er(NO_3)_3·5H_2O]为掺杂改性材料,采用溶胶-凝胶法制备锐钛矿型Nd-Er/ZnO-TiO_2复合光催化材料。利用XRD、BET、SEM、UV-Vis对所制光催化材料进行表征。以2,4-DCP为目标降解物,在高压汞灯与长弧氙灯照射下,验证所制复合光催化材料的光催化活性。光催化剂1%Nd-1%Er/5%ZnO-Ti O_2光催化效能最高。在紫外光下照射2 h,对2,4-DCP降解率为94.26%;在可见光下照射6 h,对2,4-DCP降解率为64.7%。

Nd-Er/ZnO-,TiO2,an anatase-type composite photocatalytic material is synthesized by sol-gel method through using Zn（NO3）2·（H2O）6,Nd（NO3）3·6 H2O and Er（NO3）3·5 H2O as doping modification materials and is characterized by means of X-ray diffraction（XRD）,surface area analyzer（BET）,scanning electron microscope（SEM）and UV diffuse reflectance analyzer（UV-Vis）.With 2,4-dichlorophenol（2,4-DCP） as target degradation material,the photocatalytic activity of the synthesized composite photocatalytic materials is verified under irradiation of high voltage mercury lamp and long arc xenon lamp. It is found that 1% Nd-1% Er/5% ZnO-TiO2 exhibits the highest photocatalytic efficiency and can make the degradation rate of 2,4-DCP reach 94. 26% under ultraviolet light irradiation for 2 h and64. 7% under visible light irradiation for 6 h.