采用水热法制备了前驱体碳球(CSs),将磷酸银(Ag₃PO₄)与CSs共沉淀复合制备了系列Ag₃PO₄/CSs-x%(x为0~0.8)复合光催化剂。通过XRD、FE-SEM、FT-IR、UV-Vis DRS和XPS等对所制备的光催化剂进行表征。结果表明,Ag₃PO₄有效地包覆在CSs表面,Ag₃PO₄的晶体结构不受影响。CSs的引入增强了Ag₃PO₄对可见光的吸收,增大了Ag₃PO₄和污染物的接触面积。复合光催化剂Ag₃PO₄/CSs-x%比Ag₃PO₄具有更高的活性,当m(CSs)∶m(Ag₃PO₄)=0.6∶100时,所得的Ag₃PO₄/CSs-0.6%光催化效果最佳,光照60 min时对苯酚的降解率可以达到99.4%。空穴(h⁺)和超氧自由基(·O₂^-)为降解反应的主要活性物种,并且光催化剂循环使用3次仍具有较高的光催化活性。

Ag₃PO₄/CSs-x%(x=0-0.8,mass fraction),a series of photocatalysts,are synthesized through the coprecipitation of silver phosphate with carbon spheres (CSs) that are prepared by a hydrothermal method.The samples are characterized via X-ray diffraction (XRD),field emission scanning electron microscopy (FE-SEM),Fourier transform infrared spectroscopy (FT-IR),ultraviolet-visible diffuse reflectance spectroscopy (UV-Vis DRS) and X-ray photoelectron spectroscopy (XPS).It is indicated that Ag₃PO₄ has effectively been coated on the surface of CSs,and the crystal structure of Ag₃PO₄ has not been affected.Moreover,the addition of CSs enhances the absorption of Ag₃PO₄ to visible light and expands the contact surface area of Ag₃PO₄ with contaminants.Photocatalytic experiments show that Ag₃PO₄/CSs-x%(x=0.2-0.8) have higher photocatalytic activity than Ag₃PO₄.Ag₃PO₄/CSs-0.6% has the best photo-degradation performance when m(CSs)∶m(Ag₃PO₄)=0.6∶100.The degradation efficiency of phenol over Ag₃PO₄/CSs-0.6% can reach 99.4% after 60 min of light exposure.Holes (h⁺) and superoxide radical (·O₂^-) are the main active species.Meanwhile,good photocatalytic activity has been retained after the catalyst has experienced for three degradation cycles.

樊苗苗(1993-),女,硕士生,主要从事水处理过程中催化剂的研究与应用,fanmiaomiao0714@163.com;樊国栋(1964-),男,硕士,教授,主要研究方向为光致发光材料、光催化材料,通讯联系人,fangd@sust.edu.cn。