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采用“两步溶剂热”法制备了BiOBr@Bi_2MoO_6复合光催化剂,并用XRD、SEM、XPS、PL和UV-vis DRS等手段对制备的催化剂进行表征.以罗丹明B(RhB)和双酚A(BPA)为目标污染物研究了该催化剂的可见光光催化性能.结果表明,BiOBr@Bi_2MoO_6复合光催化活性明显高于纯Bi_2MoO_6,当BiOBr的负载量为20wt%时催化活性最高,对RhB和BPA降解率分别为97.51%和95.41%.通过对降解过程中产生的活性物种的测定,指出空穴(h+)和·O_2~-在污染物降解过程中起主要作用.对BiOBr@Bi_2MoO_6复合催化剂的光催化原理进行了讨论,提出BiOBr和Bi_2MoO_6之间形成的异质结构可能是促进光催化活性提高的主要原因.另外,BiOBr@Bi_2MoO_6-20异质结具有良好的稳定性,可以进行回收和重复利用.
The prepared BiOBr @ Bi 2 MoO 6 composite photocatalyst was prepared by the method of “two-step solvothermal” and characterized by XRD, SEM, XPS, PL and UV-vis DRS etc. RhB (rhB) and bis The results showed that the photocatalytic activity of BiOBr @ Bi 2 MoO 6 composite was significantly higher than that of pure Bi 2 MoO 6. When the loading of BiOBr was 20 wt%, the photocatalytic activity of the catalyst was the highest, And BPA were 97.51% and 95.41%, respectively.The results indicated that the holes (h +) and · O_2 ~ played a major role in the degradation of BiOBr @ Bi 2 MoO 6 The photocatalytic principle of the catalyst is discussed, and it is suggested that the heterostructure formed between BiOBr and Bi_2MoO_6 may be the main reason to promote the photocatalytic activity.In addition, the BiOBr @ Bi_2MoO_6-20 heterojunction has good stability and can be recycled And reuse.