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在无和有S源(Na2S或硫脲)存在的条件下, 采用十二胺辅助的醇-水热法制备了多孔单斜晶相结构的BiVO4-δ和不同含量S掺杂的BiVO4-δ光催化剂. 利用多种手段表征了催化材料的物化性质, 评价了它们在可见光照射下催化降解亚甲基蓝或甲醛的反应活性. 结果表明, 所制光催化剂为单斜白钨矿晶相结构, 具有多孔橄榄状形貌, 比表面积为8.4-12.5 m2/g, 带隙能为2.40-2.48 eV.在S掺杂BiVO4 表面同时含有Bi5+, Bi4+, V5+和V4+物种. S掺杂对BiVO4-δ光催化剂的活性影响很大. 在可见光下照射下, BiVO4-δS0.08光催化剂对亚甲基蓝和甲醛降解反应显示出最高的光催化活性, 这与其较高的表面氧物种浓度和较低的带隙能相关.
BiVO4-δ with porous monoclinic phase and BiVO4- δ with different content of S-doped were prepared by dodecyl amine-assisted alcohol-hydrothermal method in the absence and presence of S source (Na2S or thiourea) Photocatalysts.The physical and chemical properties of the catalytic materials were characterized by a variety of means and their photocatalytic activity for the degradation of methylene blue or formaldehyde under visible light irradiation was evaluated.The results showed that the photocatalysts were monoclinic scheelite crystal structure with porous Olivine morphology with a specific surface area of 8.4-12.5 m2 / g and a bandgap energy of 2.40-2.48 eV. Bi5 +, Bi4 +, V5 + and V4 + species are also present on the S-doped BiVO4 surface. The activity of BiVO4-δS0.08 photocatalyst shows the highest photocatalytic activity for degradation of methylene blue and formaldehyde under the visible light irradiation, which is related to its higher surface oxygen species concentration and lower bandgap energy .