Effects of pH on hydrothermal synthesis and characterization of visible-light-driven BiVO4 photocatalyst
Effects of pH on hydrothermal synthesis and characterization of visible-light-driven BiVO4 photocatalyst
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DOI：
10.1016/j.molcata.2009.01.019
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发表时间：
2009-05
影响因子：
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通讯作者：
Aiping Zhang;Jin-zhi Zhang;Nai-Yi Cui;X. Tie;Yanwei An;Lingjie Li
中科院分区：
文献类型：
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作者：
Aiping Zhang;Jin-zhi Zhang;Nai-Yi Cui;X. Tie;Yanwei An;Lingjie Li
采用水热法在不同ph值下合成了bivo4粉体，并用XRD、SEM、DRS、氮气吸附和拉曼等技术对其进行了表征。结果表明，前驱体的pH值对产物的形态和结构有显著影响。通过可见光下甲基橙在水溶液中的脱色，评价了催化剂的光催化活性。发现单斜相bivo4在可见光下比四方相bivo4表现出更好的光催化活性，这是由于其更宽的禁带。在光催化方面，具有较大表面积的分散性颗粒比具有凝固性颗粒具有更高的活性。
BiVO4powders were hydrothermally synthesized at different pHs and characterized by XRD, SEM, DRS, nitrogen adsorption and Raman techniques. It revealed that the pH values of the precursors can influence significantly on the morphologies and structures of the products. The photocatalytic activities of the catalyst obtained were evaluated by the decolorization of methyl orange in aqueous solution under visible light irradiation. It was found that monoclinic BiVO4showed better photocatalytic activities than those shown by the tetragonal phase under visible light, which are attributed to its wider bandgap. The results also revealed that the dispersive particles with larger surface area represented higher activities than the coagulate ones when considering their photocatalysis.