物理化学学报 >> 2015, Vol. 31 >> Issue (10): 1932-1938.doi: 10.3866/PKU.WHXB201509064

催化和表面科学 上一篇    下一篇

GO/Ag3PO4复合光催化剂的制备、表征及光催化性能

余长林1,*(),魏龙福1,2,李家德1,何洪波1,方稳1,周晚琴1   

  1. 1 江西理工大学冶金与化学工程学院,江西赣州341000
    2 福州大学能源与环境光催化国家重点实验室,福州350002
  • 收稿日期:2015-06-25 发布日期:2015-10-10
  • 通讯作者: 余长林 E-mail:yuchanglinjx@163.com
  • 基金资助:
    国家自然科学基金资助项目(21067004, 21263005, 21567008);江西省自然科学基金青年科学基金计划(20133BAB21003);江西省教育厅高等学校科技落地计划项目(KJLD14046);江西省青年科学家培养项目(20122BCB23015);江西省远航工程项目

Preparation and Characterization of GO/Ag3PO4 Composite Photocatalyst and Its Visible Light Photocatalytic Performance

Chang-Lin. YU1,*(),Long-Fu. WEI1,2,Jia-De. LI1,Hong-Bo. HE1,Wen. FANG1,Wan-Qin. ZHOU1   

  1. 1 School of Metallurgy and Chemical Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, Jiangxi Province, P. R. China
    2 State Key Laboratory of Photocatalysis on Energy and Environment, Fuzhou University, Fuzhou 350002, P. R. China
  • Received:2015-06-25 Published:2015-10-10
  • Contact: Chang-Lin. YU E-mail:yuchanglinjx@163.com
  • Supported by:
    the National Natural Science Foundation of China(21067004, 21263005, 21567008);Young Science and Technology Project of Jiangxi Provincial Natural Science Foundation, China(20133BAB21003);Landing Project of Science and Technology of Colleges andUniversities in Jiangxi Province, China(KJLD14046);Young Scientist Training Project of Jiangxi Province, China(20122BCB23015);YuanHang Gong Cheng Project of Jiangxi Province, China

摘要:

以石墨粉为原料,采用Hummers氧化法合成氧化石墨烯(GO).然后在超声作用下,将不同含量的Ag3PO4沉积在GO上,制备了一系列4% (w,质量分数) GO/Ag3PO4、8% GO/Ag3PO4、16% GO/Ag3PO4和32% GO/Ag3PO4复合光催化剂.对所制备的光催化剂运用N2物理吸附、X射线粉末衍射(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)、拉曼光谱、傅里叶变换红外(FT-IR)光谱、紫外-可见漫反射吸收光谱(UV-Vis DRS)等手段进行了表征,并在可见光下考察了GO含量对Ag3PO4光催化降解甲基橙(MO)的性能.结果表明, GO能够和Ag3PO4实现均匀复合.复合GO提高了催化剂的比表面积,改善了催化剂的吸附性能.复合16% GO使Ag3PO4光催化活性提高最显著, 120 min内对MO的降解率达到83%,是纯Ag3PO4光催化活性的7.5倍. GO能提高催化剂的比表面积,促进光生电子-空穴(e-/h+)的分离,产生更多活性自由基,从而提高Ag3PO4光催化的活性和稳定性.

关键词: 氧化石墨烯, Ag3PO4, 复合, 光催化活性, 甲基橙, 活性自由基

Abstract:

Graphene oxide (GO) was fabricated from graphite powder by Hummers oxidation method and then, under ultrasonic irradiation, a series of GO/Ag3PO4 composite photocatalysts (4% (w, mass fraction) GO/Ag3PO4, 8% GO/Ag3PO4, 16% GO/Ag3PO4, 32% GO/Ag3PO4) were synthesized by a facile liquid deposition process. The products were characterized by N2-physical adsorption, powder X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Raman spectra, Fourier transform infrared (FT-IR) spectroscopg, and UV-Vis diffuse reflectance spectroscopy (UV-Vis DRS). The effect of GO content on the photocatalytic activity of Ag3PO4 was evaluated by photocatalytic degradation of methyl orange (MO) under visible light irradiation. The results show that GO can be easily dispersed into Ag3PO4, producing a well-connected GO/Ag3PO4 composite. Coupling of GO largely enhanced the surface area of the catalyst and the adsorption of MO. At the optimal GO content (16%), the degradation rate of MO over GO/Ag3PO4 was 83% after 120 min of light irradiation, exhibiting 7.5 times higher activity than that of pure Ag3PO4. The increase in photocatalytic activity and stability can be mainly attributed to the coupling of GO, which increased the surface area and suppressed the recombination rate of electron-hole (e-/h+) pairs and generated greater numbers of active free radicals.

Key words: Graphene oxide, Ag3PO4, Coupling, Photocatalytic activity, Methyl orange, Active free radical

MSC2000: 

  • O643