具有强吸附与可见光催化活性的红细胞状Bi_(3)OX_(y)(WO_(6))_(1-y)(X=Cl、Br、I)固溶体(英文)

Erythrocyte-like Bi_(3)OX_(y)(WO_(6))_(1-y)(X=Cl,Br,I)solid solution with strong adsorption and visible light catalytic activity

采用简单的两步水热法,成功制备了Bi_(3)OX_(y)(WO_(6))_(1-y)(X=Cl、Br、I)固溶体材料,在改变形貌的同时,增强了吸附与光催化性能。通过X射线衍射(XRD)、扫描电子显微镜(SEM)、紫外可见漫反射光谱(UV-Vis DRS)、X射线光电子能谱(XPS)、光致发光光谱(PL),对3种复合材料的结构和性质进行了详细的表征,推测了固溶体的形成原理。与BW单体相比,BI固溶体的形成使得带隙减小,可见光吸收能力增强,同时光生电子-空穴的复合率也减小。Bi_(3)OX_(y)(WO_(6))_(1-y)对于罗丹明B(RhB)阳离子染料具有很强的吸附能力。通过高浓度下的吸附实验,研究了不同材料的吸附动力学。

Bi_(3)OX_(y)(WO_(6))_(1-y)(X=Cl,Br,I)solid solution materials were successfully prepared by a simple two-step hydrothermal method,which enhanced the adsorption and photocatalytic properties while changing the morphology.The structures and properties of the three composites were characterized in detail by X-ray diffraction(XRD),scanning electron microscopy(SEM),ultraviolet-visible diffuse reflection spectroscopy(UV-Vis DRS),X-ray photoelectron spectroscopy(XPS),and photoluminescence spectroscopy(PL).Solid solutions were speculated in principle.Compared to the BW monomer,the formation of the BI solid solution in Bi_(3)OX_(y)(WO_(6))_(1-y)resulted in a decreased bandgap,which led to an enhanced capacity for absorbing visible light.Furthermore,it helped to reduce the recombination rate of electron-hole pairs generated by light.Bi_(3)OX_(y)(WO_(6))_(1-y)exhibited a strong adsorption capacity for rhodamine B(RhB)cationic dye.Adsorption kinetics of different materials were investigated through adsorption experiments conducted at high concentrations.