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首先合成高结晶度的BiOBr纳米片,然后利用光化学气相沉积(PCVD)法将不同含量的Pd纳米粒子沉积在BiOBr纳米片上.运用N_2-物理吸附-脱附、X射线粉末衍射(XRD)、透射电镜(TEM)、X射线光电子能谱(XPS)、光致发光(PL)谱、紫外可见漫反射吸收光谱(UV-Vis DRS)技术对合成的Pd/BiOBr进行了表征.考察了Pd含量对BiOBr光吸收性能和紫外光(λ=254 nm)、可见光下对染料酸性橙Ⅱ的光催化降解性能的影响.结果表明,沉积Pd对样品的比表面积影响不大,Pd纳米粒子能在一定程度上增强催化剂对可见光的吸收能力,并显著抑制光生电子和空穴的复合.紫外光下,当Pd的质量分数为0.5%时,BiOBr催化降解染料的活性提高到1.6倍,而在可见光下含4%的Pd能使BiOBr表现出最高的催化活性,为纯BiOBr的1.5倍.
Firstly, BiOBr nanosheets with high crystallinity were synthesized and then Pd nanoparticles were deposited on the BiOBr nanosheets by photochemical vapor deposition (PCVD) method.Using N 2 -physical adsorption-desorption, X-ray powder diffraction (XRD) The synthesized Pd / BiOBr was characterized by scanning electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), photoluminescence (PL) and UV-Vis DRS techniques. The effect of visible light on the photocatalytic degradation of dye-acid orange Ⅱ was investigated by means of optical absorption spectroscopy and BiBr light absorption (λ = 254 nm). The results showed that Pd had little influence on the specific surface area of the sample, and Pd nanoparticle could, to a certain extent On the catalyst to enhance the visible light absorption capacity, and significantly inhibited the photogenerated electron and hole recombination.Ultraviolet light, when the mass fraction of Pd is 0.5%, the activity of BiOBr catalytic degradation of the dye increased to 1.6 times, and in the visible light containing 4% Pd gave BiOBr the highest catalytic activity, 1.5 times that of pure BiOBr.