物理化学学报 >> 2015, Vol. 31 >> Issue (12): 2332-2340.doi: 10.3866/PKU.WHXB201510202

催化和表面科学 上一篇    下一篇

还原氧化石墨烯/TiO2纳米复合物制备及其光催化性能

齐齐1,王育乔1,*(),王莎莎1,祁昊楠1,卫涛2,孙岳明1,*()   

  1. 1 东南大学化学化工学院,南京211189
    2 温州医科大学药学院,浙江温州325035
  • 收稿日期:2015-08-21 发布日期:2015-12-04
  • 通讯作者: 王育乔,孙岳明 E-mail:yqwang@seu.edu.cn;sun@seu.edu.cn
  • 基金资助:
    国家自然科学基金(21173042);国家重点基础研究发展规划项目(973)(2013CB932902);中央高校基本科研业务费(2242014K10025,3207045419);江苏省自然科学基金(BK20141338);江苏省工业支撑计划(BE2013118);江苏省科技成果转化专项资金(BA2014069);东南大学校级研讨课基金(1107041501);江苏省普通高校研究生实践创新计划项目(SJLX150047)

Preparation of Reduced Graphene Oxide/TiO2 Nanocomposites and Their Photocatalytic Properties

Qi. QI1,Yu-Qiao. WANG1,*(),Sha-Sha. WANG1,Hao-Nan. QI1,Tao. WEI2,Yue-Ming. SUN1,*()   

  1. 1 1School of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189, P. R. China
    2 School of Pharmaceutical Sciences, Wenzhou Medical University, Wenzhou 325035, Zhejiang Province, P. R. China
  • Received:2015-08-21 Published:2015-12-04
  • Contact: Yu-Qiao. WANG,Yue-Ming. SUN E-mail:yqwang@seu.edu.cn;sun@seu.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(21173042);National Key Basic Research Program of China (973)(2013CB932902);Fundamental Research Funds for the Central Universities, China(2242014K10025,3207045419);Natural Science Foundation ofJiangsu Province, China(BK20141338);Science & Technology Support Project of Jiangsu Province, China(BE2013118);Special Funds forTransformation of Scientific & Technological Achievements of Jiangsu Province, China(BA2014069);Seminar Funds of Southeast University,China(1107041501);Practice Innovation Program for Graduate Students of Jiangsu Province, China(SJLX150047)

摘要:

采用一步水热法制备了还原氧化石墨烯-二氧化钛(RGO-P25)纳米复合物.通过透射电子显微镜(TEM)、傅里叶变换红外(FTIR)光谱、X射线光电子能谱(XPS)、X射线衍射(XRD)及紫外-可见漫反射谱(UVVisDRS)对复合材料的结构和光电性能进行了表征.在紫外光照和可见光照条件下,研究了不同复合比例的复合物的光催化降解甲基蓝(MB)的性能.结果表明:在水热过程中氧化石墨烯被还原,通过静电引力相互作用得到了具有较高缺陷的还原氧化石墨烯复合物.随着RGO含量的增加,复合物的禁带宽度由3.00 eV变到2.27eV,复合物的导电性增强.在可见光和紫外光光照条件下, 30 min内1%(w,质量分数)RGO-P25光催化降解甲基蓝的效率都超过了80%.紫外光照条件下, 1%RGO-P25纳米复合物催化降解N3染料, cis-Ru(H2dcbpy)2(NCS)2 (H2dcbpy = 4, 4'-二羧酸-2, 2'-联吡啶), 30 min内63%(摩尔分数)的染料被降解.与P25(75%锐钛矿, 25%金红石)相比,石墨烯的加入大大提高了光催化效率,有效抑制了电子-空穴对的复合.

关键词: 石墨烯, TiO2, 纳米复合物, 水热法, 光催化活性

Abstract:

P25-reduced graphene oxide nanocomposites (RGO-P25) are prepared by using a facile one-step hydrothermal method. Their structure and photoelectrical properties are characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, X-ray photoelectron spectroscopy (XPS), and ultraviolet-visible diffuse reflectance spectroscopy (UV-Vis DRS). The degradation effect of different addition ratios of the RGO-P25 nanocomposite on the photocatalytic degradation of methylene blue (MB) is investigated under UV and visible illumination. Results show that graphene oxide can be reduced during the hydrothermal reaction and thus, a mixed high defect P25 particles and RGO sheet composite is formed by electrostatic attraction. Band gaps of nanocomposites decreased from 3.00 to 2.27 eV with an increase in the amount of the RGO content. The electrical conductivities of the nanocomposites enhanced with an increased RGO amount. Over 80% of the initial methylene blue dye is decomposed by 1% (w, mass fraction) RGO-P25 after 30 min under either visible light or ultraviolet light. Under UV light illumination, 63% (molar fraction) of the N3 dye, cis-Ru(H2dcbpy)2(NCS)2 (H2dcbpy = 4, 4'-dicarboxy-2, 2'-bipyridyl), is decomposed by the 1% RGO-P25 nanocomposite. Compared with the bare P25 (75% anatase; 25% rutile), the continual addition of RGO enhances the photocatalytic activity and gives rise to the more effective separation of photogenerated electron-hole pairs.

Key words: Graphene, TiO2, Nanocomposite, Hydrothermal method, Photocatalysis property

MSC2000: 

  • O646