两步法制备B-Mo共掺杂BiVO_4及光催化活性研究

Synthesis and Photocatalytic Performance of B-Mo Co-doped BiVO_4 Photocatalyst Through Two Steps

采用柠檬酸络合和浸渍两步法制备了一系列B-xMo共掺杂BiVO_4可见光光催化剂,并采用XRD、XPS、SEM、EDS、BET和UV-vis等表征和分析。以降解甲基橙(MO)、亚甲基蓝(MB)、金橙Ⅱ号(AOⅡ)和罗丹明B(RhB)溶液为指针反应,考察掺杂对BiVO_4可见光催化活性的影响。结果表明:B-Mo共掺杂能抑制BiVO_4晶粒生长,比表面积增大,共掺杂后BiVO_4禁带宽度窄化,且氧空位较单掺杂增加。当Mo掺杂量为2.5%(原子分数)时制备的B-2.5Mo-BiVO_4对甲基橙的降解率达96%左右,且该样品也能有效降解亚甲基蓝(MB)、金橙Ⅱ号(AOⅡ)和罗丹明B(RhB)溶液。

Serials B-xMo codoping BiVO4 photocatalysts were successfully synthesized by citric acid complex and impregnation two steps. The as prepared samples were characterized by XRD, XPS, SEM, BET, and UV-vis DRS analyses and the photocatalytic activities were investigated through photocatalytic degradation rate of methyl orange （MO）, methyl blue, acid orange Ⅱ , and rhodamine B. The results show that：B-Mo codoping can inhibit the crystal sizes of BiVO4 photocatalysts but the phase still was monoclinic. The B-Mo codoping BiVO4 samples have higher surface area, lower band-gaps and more oxygen vacancy, which contribute to the higher photocatalytic performance. The degradation rate of MO in 50 rain is 96% for B-2. 5Mo-BiVO4 which also can effectively degrade methyl blue, acid orange Ⅱ , and rhodamine B.