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为了进一步提高B-BiVO_4的光催化活性,通过溶胶-凝胶和浸渍两步法制备Ni掺杂B-BiVO_4光催剂(Ni-B-BiVO_4)。通过XPS、XRD、SEM、BET、EDS和UV-Vis等手段对样品进行表征。结果表明,单或共掺杂均不会改变样品的晶型和形貌;但当掺入Ni后,样品的晶体粒径减小。与未参杂、B以及Ni单掺杂相比,Ni-B-BiVO_4样品的光吸收向长波长方向偏移;且N-B共掺杂后,样品中V~(4+)和表面羟基氧增多。当最佳Ni掺杂量为0.30%(质量分数)时,所制备的0.3Ni-B-BiVO_4在50 min内对甲基橙的降解率达95%左右,且该样品能有效降解亚甲基蓝(MB)、金橙II号(AOⅡ)和罗丹明B(RhB)溶液。共掺杂样品活性的提高主要是B与Ni的协同作用所致。
In order to further improve the photocatalytic activity of B-BiVO 4, Ni-doped B-BiVO 4 photocatalyst (Ni-B-BiVO 4) was prepared by sol-gel and impregnation two-step method. The samples were characterized by XPS, XRD, SEM, BET, EDS and UV-Vis. The results show that the single crystal or the common doping do not change the crystal shape and the morphology of the sample. However, when Ni is doped, the crystal size of the sample decreases. The absorption of Ni-B-BiVO_4 sample shifts to longer wavelength than that of undoped, B and Ni single-doped samples. And after NB co-doping, the V 4+ and the surface hydroxyl oxygen in the sample increase . When the optimum Ni doping amount was 0.30% (mass fraction), the degradation rate of methyl orange in 0.3Ni-B-BiVO 4 was about 95% within 50 min, and the sample could effectively degrade methylene blue ), AO II and RhB solution. Co-doped sample activity is mainly due to the synergistic effect of B and Ni.