铬和钼掺杂对HCa_2Nb_3O_(10)/Pt光催化性能的影响

Photocatalytic Activity of HCa_2Nb_3O_(10)/Pt Doped with Cr^(3+)and Mo^(6+)

通过高温固相反应合成了铌酸盐KCa2Nb3O10及Cr3+和Mo6+掺杂(摩尔分数5%)的KCa2Nb3O10,并通过离子交换反应制备出HCa2Nb3O10及Cr3+和Mo6+掺杂的HCa2Nb3O10,采用X射线衍射、原子吸收光谱、扫描电镜等对所制得的样品进行了表征.在甲醇为电子给体、Pt为助催化剂的情况下,研究了催化剂HCa2Nb3O10及Cr3+和Mo6+掺杂的HCa2Nb3O10在紫外光辐射下分解水产氢的光催化活性,并讨论了引起催化剂活性差异的原因.

Photocatalysts HCa2Nb3O10 and HCa2Nb3O10 doped with Cr^3＋ and Mo^6＋ were prepared by solid-state reaction followed by an ion-exchange reaction. The samples were characterized by powder X-ray diffraction, UV-Vis diffuse reflectance spectrum and scan electron microscope. The photocatalytic activities of HCa2Nb3O10 and HCa2Nb3O10 doped with Cr^3＋ and Mo^6＋ were evaluated by photocatalytie water-splitting for hydrogen production with methanol as electron donor and Pt as promoter catalyst under UV irradiation with wavelength more than 290 nm. The difference of photocatalytie activity among them was also discussed.