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以Bi(NO_3)_3·5H_2O、NH_4H_2PO_4和稀土氧化物为原料,在乙二醇介质中采用溶剂热法制备了不同稀土元素(Ln=Sm、Pr、Tb)掺杂的Bi PO4光催化剂(记为Bi PO4-Ln,包含Bi PO4-Sm、Bi PO4-Pr和Bi PO_4-Tb)。通过X-射线衍射法(XRD)、扫描电子显微镜(SEM)、X-射线光电子能谱(XPS)和紫外可见漫反射光谱(UV-Vis DRS)对制备的催化剂进行了表征。以染料罗丹明B(rhodamine B,Rh B)及小分子水杨酸(salicylic acid,SA)为目标化合物,研究了在可见光激发下(λ≥420 nm)Bi PO4-Ln对目标污染物的光催化降解特性,结果表明,Bi PO4-Ln相较纯Bi PO4,其光吸收范围从紫外光扩大到可见光区域,在3种Bi PO_4-Ln催化剂中,Bi PO4-Sm对Rh B的吸附能力最强且其光催化活性较强,通过测定其在可见光下降解Rh B过程中产生的活性物种,发现Bi PO4-Ln在氧化降解Rh B的过程中主要涉及到·OH及O-2·的氧化机理。
Bi PO4 photocatalysts doped with different rare earth elements (Ln = Sm, Pr, Tb) were prepared by the solvothermal method using Bi (NO_3) _3 · 5H_2O, NH_4H_2PO_4 and rare earth oxides as raw materials Is Bi PO4-Ln, including Bi PO4-Sm, Bi PO4-Pr and Bi PO 4-Tb). The prepared catalysts were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and UV-Vis DRS. With the dye Rhodamine B (Rh B) and small molecule salicylic acid (SA) as the target compounds, the effects of Bi PO4-Ln on the target pollutants under visible light excitation (λ≥420 nm) The results showed that Bi PO4-Ln has a larger absorption range from UV to visible light than pure Bi PO4. Among the three Bi PO 4 -Ln catalysts, Bi PO 4-Sm has the highest adsorption capacity for Rh B Strong and strong photocatalytic activity, by measuring its activity in the visible light degradation Rh B process species found Bi PO4-Ln in the oxidative degradation of Rh B mainly involves · OH and O-2 · oxidation mechanism.