BiVO4/MnO2复合催化氧化剂的制备及性能

Preparation and Properties of Composite Catalyst-oxidizer BiVO4/MnO2

摘要:

采用一步水热法成功制备了BiVO4/MnO2复合光催化氧化剂，通过XRD、FTIR、SEM、EDS、XPS和UV-vis DRS对其结构进行了表征，并以罗丹明B溶液作为目标降解物考察了其光催化氧化活性。结果表明，复合物中形成了多孔结构 ，BiVO4的晶体结构未发生改变，呈现出片状组合的叶状廓形，BiVO4-MnO2的带隙小于BiVO4；当MnO2与BiVO4的质量比为10%时，光催化活性最好；RhB溶液pH为5时，BiVO4//MnO2光照20 min 对其降解率为98.4%，远高于纯BiVO4（13.1%）。由于MnO2具有氧化性，BiVO4-MnO2复合材料可做光催化-氧化剂。

Abstract:

BiVO4/MnO2 composite catalyst-oxidizer are successfully prepared by one-step hydrothermal method, and its structure and properties were analyzed by XRD, FTIR, SEM, EDS and UV-vis DRS. The catalytic-oxidative activities of the samples were evaluated by the degradation of Rhodamine B(RhB). The results exhibited that the composite formed the porous structure, the crystal structure of BiVO4 in BiVO4/MnO2 composite did not change, and shows a leaf-like profile with flaky combination’smorphology. The band gap of BiVO4/MnO2 is smaller than that of BiVO4. When the mass ratio of BiVO4/MnO2 was 10%, the composite showed the highest photocatalytic-oxidative activity. The degradation rate of RhB reached 98.4% at 20 minutes as the pH of solution was 5, and it is much higher than that of pure BiVO4(13.1%). Due to the oxidizing properties of MnO2, BiVO4-MnO2 composites can be used as photocatalytic-oxidants.