【摘要】 采用水热-溶剂热两步法制备了BiPO₄/BiVO₄复合材料.FESEM和TEM分析结果表明,BiVO₄呈高{010},{110}暴露晶面的截角双锥状,BiPO₄纳米颗粒较均匀地附着在BiVO₄表面上,形成了异质结.光电流测试结果表明,异质结能促进光生载流子的有效转移和分离.在可见光作用下,BiPO₄/BiVO₄可有效降解罗丹明B,当BiPO₄与BiVO₄的投料摩尔比为3∶10时,样品的光催化活性最优.更多还原

【Abstract】 BiPO₄/ BiVO₄ composites were prepared by combining hydrothermal and solvothermal synthetic methods. Field emission scanning electron microscopy（ FESEM） and transmission electron microscopy（ TEM）revealed that the as-prepared BiVO₄ exhibited a truncated bipyramid morphology with high { 010 },{ 110 }exposed facets,and that the as-obtained BiPO₄ nanoparticles were grown on the surface of BiVO₄,leading to the formation of the BiPO₄/ BiVO₄ heterojunction. The transient photocurrent-time behaviors indicated that the formed heterojunction made the transfer and separation of the photo-generated carriers more efficient. The as-synthesized BiPO₄/ BiVO₄ composites exhibited high photocatalytic activities in the degradation of rhodamine B under visible-light irradiation. It was found that the sample prepared with a BiPO₄/ BiVO₄ molar ratio of 3 ∶ 10 in the reactants showed the best performance.更多还原