An efficient sunlight responsive Ag2 S / Ag3 PO4 composite was prepared by co-precipitation method combined with hydrothermal treatment. The morphology, composition, surface physical and chemical property and optical absorption property were characterized by scanning electron microscope(SEM), X-ray powder dif-fraction(XRD), X-ray photoelectron spectroscopy ( XPS) and ultraviolet-visible diffuse reflection ( UV-Vis DR). The 1% Ag2 S / Ag3 PO4 composite has rough surface with smaller particle size less than 0. 8 μm and wider bandgap(2. 24 eV) compared to Ag3 PO4 . The photocatalytic activity of Ag2 S / Ag3 PO4 was evaluated by degradation of salicylic acid which is a typical material in pharmaceuticals and personal care products(PPCPs) and harmful to human health and ecosystems. The results show that Ag2 S / Ag3 PO4 composite doped 1% Ag2 S with hydrothermal treated at 120 ℃ for 4 h exhibits excellent salicylic acid degradation efficiency reached to 88. 2% under simulated sunlight irradiation for 60 min and the light source current intensity is 15 A, when Ag2 S / Ag3 PO4 used 0. 15 g, the initial concentration of salicylic acid is 10 mg / L and pH is 6. 0, respectively. The contribution of various parameters for the enhanced photocatalytic activities is revealed in detail. The pri-mary reasons for the increased simulated sunlight photocatalyst activity are contribution to the perfect cubic crystal structure, smaller particle size and broaden the visible spectral response. Doping sulfide is benefit to absorb sunlight and separate the electron-hole effectively.%以 AgNO3, Na2 HPO4和硫粉为原料,采用共沉淀-水热法合成了具有太阳光响应型 Ag2 S/ Ag3 PO4复合材料,运用扫描电子显微镜(SEM)、 X 射线粉末衍射(XRD)、 X 射线光电子能谱(XPS)和紫外-可见漫反射(UV-Vis DR)光谱等方法对样品进行了表征,并在模拟太阳光条件下,考察了 Ag2 S/ Ag3 PO4对水杨酸的光催化降解效率.结果表明,与 Ag3 PO4相比, Ag2 S 的负载量为1%(质量分数)时 Ag2 S/ Ag3 PO4粒径变小,呈立方晶相结构； Ag2 S/ Ag3 PO4复合材料可以有效促进光生电子-空穴分离,使 Ag3 PO4禁带宽度降低到2.24 eV,并增强了可见光的吸收能力.在 Ag2 S 负载量为1%,120℃水热4 h 条件下, Ag2 S/ Ag3 PO4复合材料具有最佳光催化活性,经模拟太阳光照射60 min 对10 mg/ L 的水杨酸去除率达到88.2%.
展开▼
