【摘要】 利用光化学沉积法合成了一系列不同Pd含量(0.5%、1%、2%、4%)的Pd/BiOCl复合纳米片。利用X射线粉末衍射(XRD)、N2-物理吸附/脱附、扫描电镜(SEM)、透射电镜(TEM)、X射线光电子能谱(XPS)、紫外可见漫反射吸收光谱(UV-vis DRS)等物理化学手段对合成的Pd/BiOCl进行了表征。以模型污染物-染料酸性橙II为光催化降解对象,考察了该系列光催化剂在紫外光(λ=254 nm)和可见光下光催化降解酸性橙II的活性。表征结果显示,尺寸为2 nm左右的Pd纳米粒子沉积在BiOCl纳米片上没有引起催化剂的比表面积的明显变化,但是Pd纳米粒子能使催化剂具有一定的可见光吸收能力。活性测试表明,在紫外光下,当沉积2%的Pd纳米粒子时,BiOCl催化降解染料的活性提高了2.1倍,而在可见光下光催化活性提高了6.3倍。更多还原

【Abstract】 A series of Pd /BiOCl composite nanoplates with different Pd concentration(0. 5%,1%,2%,4%) were synthesized via photochemical deposition method. The prepared products were characterized by some physicochemical characterizations such as X-ray diffraction(XRD),N2-physical adsorption /desorption,scanning electron microscopy(SEM), transmission electron microscopy(TEM), X-ray photoelectron spectroscopy(XPS),and UV-Vis diffuse reflectance spectroscopy(UV-vis DRS). Acid orange II as model pollutants-dye was chosen for the object of photocatalytic degradation. The effects of this series of catalysts in degradation of acid orange II were evaluated under both UV light(λ = 254 nm)and visible light irradiation. The results show that about 2 nm Pd nanoparticles were successfully deposited over the BiOCl nanoplates. The specific surface area of the catalyst show no obvious variations due to the deposition of Pd nanoparticles. However, the UV-Vis DRS results indicate that Pd nanoparticles can enable the catalyst to exhibit slightly absorption ability to visible light. The activity texts demonstrat that the deposition optimum Pd nanoparticles with 2%(mass fraction) gives 2. 1 times increase in activity under UV light irradiation and 6. 3 times increase under visible light irradiation.更多还原