【摘要】 采用一步水热法制备了BiVO₄-MnO₂复合材料,通过XRD、FTIR、SEM、EDS、XPS、PL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活性。结果表明:BiVO₄复合MnO₂构成了较大的孔径和比表面积,有利于分子尺寸为1.59 nm×1.18 nm×0.56 nm的罗丹明B分子扩散和吸附;BiVO₄与MnO₂二者之间产生了电子耦合作用,减弱了BiVO₄的荧光强度,表明复合MnO₂能有效地抑制光生电子和空穴的复合,提高量子的利用效率,使得复合材料较单独的BiVO₄或MnO₂对罗丹明B（Rh B）有较好的光催化降解效果。当m（MnO₂）∶m（BiVO4）=10∶100时,光照3 h对10 mg/L的Rh B（100 mL）的降解率达到97.8%。更多还原

【Abstract】 BiVO₄-MnO₂ composite catalysts with different mass ratios of BiVO₄ to MnO₂ were prepared by one-step hydrothermal method. The structure and properties of the as-prepared composite catalysts were characterized by XRD, FTIR, SEM, EDS, XPS, PL and UV-Vis DRS. The catalytic-oxidative activities of the samples were evaluated by the degradation of Rhodamine B（RhB）. The results showed that BiVO₄@MnO₂ exhibited a large pore size and surface area, which was beneficial to the diffusion and adsorption of RhB with a molecular size of 1.59 nm×1.18 nm×0.56 nm. Compared with BiVO₄ or MnO₂, BiVO₄@MnO₂ had better photocatalysis effect for RhB because of the interaction between BiVO₄ and MnO₂ produced an electronic coupling formed heterojunction, which could effectively inhibit the recombination of photogenerated electrons and holes, and improve the utilization efficiency of quantum. When m（MnO₂）∶m（BiVO₄）= 10∶100, the degradation rate of 10 mg/L RhB（100 mL） under irradiation for 3 h could reach 97.8%.更多还原