催化学报

催化学报 ›› 2012, Vol. 33 ›› Issue (12): 1974-1981.DOI: 10.3724/SP.J.1088.2012.20820

• 研究论文 • 上一篇    下一篇

Ag(Au)/石墨烯-TiO2 复合光催化剂的制备及其模拟太阳光光催化性能

姜凌霄1,2, 李可心1,*, 颜流水1, 戴玉华1, 黄智敏1   

  1. 1南昌航空大学环境与化学工程学院, 生态诊断修复与污染阻断技术省级重点实验室, 江西南昌 330063; 2江西省环境监测中心站, 江西南昌 330063
  • 收稿日期:2012-09-01 修回日期:2012-09-17 出版日期:2013-01-18 发布日期:2012-12-18

Preparation of Ag(Au)/Graphene-TiO2 Composite Photocatalysts and Their Catalytic Performance under Simulated Sunlight Irradiation

JIANG Lingxiao1,2, LI Kexin1,*, YAN Liushui1, DAI Yuhua1, HUANG Zhimin1   

  1. 1Provincial Key Laboratory of Ecological Diagnosis-Remediation and Pollution Blocking Technology, Department of Environment and Chemical Engineering, Nanchang Hangkong University, Nanchang 330063, Jiangxi, China; 2Jiangxi Province Environmental Monitoring Center Station, Nanchang 330063, Jiangxi, China
  • Received:2012-09-01 Revised:2012-09-17 Online:2013-01-18 Published:2012-12-18

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摘要： 分别采用溶剂热还原和光还原沉积法制备了石墨烯-TiO2 和 Ag(Au)/石墨烯-TiO2 复合光催化剂, 并表征了其相结构、形貌、孔隙率、光谱吸收性质以及组成结构. 结果表明, 石墨烯与 TiO2 通过 C–O–Ti 共价键相互作用, Ag 或 Au 纳米粒子均匀沉积在石墨烯和 TiO2 表面. 在模拟太阳光照射下, 通过对水相中罗丹明 B 和甲基橙的降解, 考察了光催化剂活性的差异, 并研究了其降解动力学. 结果表明, 由于量子效率的提高、带隙能的降低以及织构性质的优化, 复合光催化剂表现出比纯 TiO2 更高的光催化活性.

关键词: 石墨烯, 二氧化钛, 银, 金, 溶剂热还原, 光还原, 罗丹明 B, 甲基橙

Abstract: To improve the solar utilization efficiency of TiO2, the graphene-TiO2 and Ag(Au)/graphene-TiO2 composite photocatalysts were prepared by solvothermal reduction and photoreduction deposition technique, respectively. The phase structure, morphology, porosity, optical absorption property as well as composition and structure of as-prepared materials were characterized. The results indicated that TiO2 interacts with graphene via Ti–O–C covalent bonds and Ag or Au nano-particles evenly deposite on the graphene and TiO2 surface. The photocatalytic activity and degradation kinetics of the as-prepared photocatalysts were studied by the degradation of aqueous rhodamine B and methyl orange under solar simulating Xe lamp irradiation. The results indicated that the composite photocatalysts exhibit higher photocatalytic activity compared with pure TiO2 due to enhanced quantum efficiency, narrowed band gap, and perfect textural properties.

Key words: graphene, titania, silver, gold, solvothermal reduction, photoreduction, rhodamine B, methyl orange