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采用浸渍法制备Pd-AgNbO3光催化剂,并运用XRD、XPS、SEM-EDS和DRS等方法对光催化剂进行表征与分析。以亚甲基蓝染料(MB)为降解污染物,考察Pd掺杂对AgNbO3光催化活性的影响。结果表明,Pd引入后AgNbO3的晶型结构及表面性质并未发生变化。DRS分析表明,Pd掺杂后光催化材料在可见光区的吸光度明显提高。光催化降解实验表明,当Pd的掺杂量为0.8%(质量分数,下同),热处理温度为400℃,煅烧时间为3h时,光催化降解活性最高,MB降解率为92.2%。Pd-AgNbO3光催化降解MB符合一级反应动力学特性。
The Pd-AgNbO3 photocatalyst was prepared by impregnation method. The photocatalyst was characterized and characterized by XRD, XRD, SEM-EDS and DRS. The effect of Pd doping on the photocatalytic activity of AgNbO3 was investigated with methylene blue dye (MB) as degradation pollutant. The results showed that the crystal structure and surface properties of AgNbO3 did not change after Pd introduction. DRS analysis showed that the absorbance of the photocatalytic material in the visible region after Pd doping was significantly increased. Photocatalytic degradation experiments showed that the photocatalytic degradation activity of Pd was 92.2% when the doping amount of Pd was 0.8% (mass fraction), the heat treatment temperature was 400 ℃ and the calcination time was 3h. The photocatalytic degradation of MB by Pd-AgNbO3 conforms to the first-order reaction kinetics.