以硝酸银、磷酸氢二钠为原料,通过水热合成法合成磷酸银(Ag3PO4)半导体光催化剂,研究了Ce3+,Er3+,Eu3+和Sm3+稀土离子掺杂对Ag3PO4催化性能的影响。采用X射线衍射仪、扫描电子显微镜、紫外-可见分光光度计等对其结构和性能进行分析。以亚甲基蓝为模拟废液进行光催化降解实验,评价Ag3PO4的光催化性能。结果表明:制备的样品均为纯立方相Ag3PO4;质量浓度为10mg/L的亚甲基蓝溶液催化降解30min后,掺杂稀土离子的Ag3PO4样品催化性能明显比纯Ag3PO4的催化性能好,其中纯Ag3PO4的降解率为65.75%,掺杂1%(摩尔分数,下同)Ce3+的Ag3PO4降解率为96.59%,掺杂1% Er3+的Ag3PO4降解率为99.39%,掺杂1% Eu3+的Ag3PO4降解率为95.39%,掺杂1% Sm3+的Ag3PO4降解率为98.06%。经过3次循环降解后,掺杂1% Ce3+的Ag3PO4降解率仍然达到56.13%。
The silver phosphate semiconductor photocatalyst was prepared by hydrothermal synthesis using silver nitrate and sodium dihydrogen phosphate as the main materials.The influence of Ce3+,Er3+,Eu3+ and Sm3+ rare earth ions doped with different molar mass on the catalytic properties and activity of the products was investigated.The structural characteristics were analyzed by XRD,SEM and visible light spectrophotometer.The photocatalytic properties of the material were evaluated by using methylene blue with concentration of 10mg/L,as a simulated photocatalytic degradation experiment.The results showed that the catalytic performance of Ag3PO4 doped with rare earth ions after degradation of 30min was better than that of pure Ag3PO4.The degradation rate of pure Ag3PO4 was 65.75%,mole fraction 1% Ce3+ Ag3PO4 was 96.59%,1% Er3+ Ag3PO4 was 99.39%,1% Eu3+ Ag3PO4 was 95.39%,and 1% Sm3+ Ag3PO4 was 98.06%.The degradation rate of 1% Ce3+ Ag3PO4 can also reached 56.13% after cycled for three times.
[1] Yi Z,Ye J,Kikugawa N,et al.An orthophosphate semiconductor with photooxidation properties under visible-light irradiation[J].Nature Materials,2010,9(7):559-564.
[2] Bi Y P,Hu H Y,Jiao Z B,et al.Two-dimensional dendritic Ag3PO4 nanostructures and their photocatalytic properties[J].Phys Chem Chem Phys,2012,14(42):14486-14488.
[3] Teng Fei,Liu Zailun,Zhang An,et al.Photocatalytic performances of Ag3PO4 polypods for degradation of dye pollutant under natural indoor weak light irradiation[J].Environ Sci Technol,2015,49:9489-9494.
[4] Subrata Mandal,Rajakumar Ananthakrishnan.Sustainable design of hierarchically porous Ag3PO4 microspheres through a novel natural template and their superior photooxidative capacity[J].Sustainable Chem Eng,2018,6:1091-1104.
[5] Li Tengfei,Wei Haoran,Jia Hanzhong,et al.Mechanisms for highly efficient mineralization of bisphenol a by heterostructured Ag2WO4/Ag3PO4 under simulated solar light[J].Sustainable Chem Eng,2019,7:4177-4185.
[6] Zhu Qing,Wang Wansheng,Lin Ling,et al.Facile synthesis of the novel Ag3VO4/AgBr/Ag plasmonic photocatalyst with enhanced photocatalytic activity and stability[J].J Phys Chem C,2013,117(11):5894-5900.
[7] Rawal S B,Sung S D,Lee W I.Novel Ag3PO4/TiO2 composites for efficient decomposition of gaseous 2-propanol under visible-light irradiation[J].Catal Commun,2012,17:131-135.
[8] Liu W,Wang M L,Xu C X,et al.Ag3PO4/ZnO:an efficient visible-light-sensitized composite with its application in photocatalytic degradation of Rhodamine B[J].Mater Res Bull,2013,48(1):106-113.
[9] Neerugatti Krishna Rao Eswar,Venktesh Katkar V,Praveen Ramamurthy C,et al.Novel AgBr/Ag3PO4 decorated ceria nanoflake composites for enhanced photocatalytic activity toward dyes and bacteria under visible light[J].Ind Eng Chem Res,2015,54:8031-8042.
[10] Wan J,Du Z,Liu E,et al.Z-scheme visible-light-driven Ag3PO4 nanoparticle@MoS2 quantum dot/few-layered MoS2 nanosheet heterostructures with high efficiency and stability for photocatalytic selective oxidation[J].J Catal,2017,345:281-294.
[11] Yao W F,Zhang B,Huang C P,et al.Synthesis and characterization of high efficiency and stable Ag3PO4/TiO2 visible light photocatalyst for the degradation of methylene blue and Rhodamine B solutions[J].J Mater Chem,2012,22(9):4050-4055.
[12] Yu Hongchao,Kang Haixiao,Bi Yingpu,et al.Tunable photocatalytic selectivity and stability of Ba-doped Ag3PO4 hollow nanosheets[J].Chinese Journal of Catalysis,2015,36(9):1587-1595.
[13] Pakpoom Reunchan,Naoto Umezawa.Sulfur and silicon doping in Ag3PO4[J].J Phys Chem C,2015,119:2284-2289.
[14] 刘俊莉,惠爱平,李妍,等.“蝉蛹状”Ce掺杂纳米ZnO的制备及光催化性能研究[J].陕西科技大学学报,2016,34(1):60-64.
[15] 马威,高航,张艳惠,等.N、Ni共掺杂TiO2光催化剂的制备及对亚甲基紫降解性能研究[J].应用化工,2012,41(9):1560-1566.
[16] 周丽,邓慧萍,张为.可见光响应的银系光催化剂材料[J].化学进展,2015,27(4):349-360.
