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以KNO3为矿化剂,用水热法制备了3D分级结构Bi2WO6微球,通过XRD、SEM、BET对产物进行了表征.探讨了3D分级结构Bi2WO6微球可能的形成机理.以罗丹明B为模型污染物,研究了合成产物的光催化性质.结果表明:在紫外光下,RhB的降解以共轭结构断裂的光催化反应为主;而在可见光照射下,RhB的降解可能是光催化和光敏化共同作用的结果.进一步以吡啶为探针分子,通过吸附吡啶红外光谱探讨了Bi2WO6表面酸性与光催化降解RhB之间的关系.研究显示,Bi2WO6具有较强的表面酸性,增强了Bi2WO6与RhB分子之间吸附作用,有利于染料分子上的电子跃迁至催化剂上,易于发生光敏化和光催化反应.
The 3D hierarchical Bi2WO6 microspheres were prepared by hydrothermal method using KNO3 as mineralizer and the products were characterized by XRD, SEM and BET.The possible mechanism of formation of Bi2WO6 microspheres with 3D hierarchical structure was discussed.The model of RhB The results showed that under ultraviolet light, the degradation of RhB was dominated by the photocatalytic reaction of the conjugate structure. In the visible light irradiation, the degradation of RhB was probably due to photocatalytic and photosensitization .By pyridine as the probe molecule, the relationship between the surface acidity of Bi2WO6 and the photocatalytic degradation of RhB was also investigated by the adsorption of pyridine.It was found that Bi2WO6 had a strong surface acidity and enhanced the interaction between Bi2WO6 and RhB Adsorption between molecules is conducive to electronic transitions on the dye molecules onto the catalyst, prone to photosensitization and photocatalytic reactions.