物理化学学报 >> 2015, Vol. 31 >> Issue (12): 2349-2357.doi: 10.3866/PKU.WHXB201510281

催化和表面科学 上一篇    下一篇

碳点修饰多孔ZnO纳米棒增强光催化性能

冯昌1,邓晓燕1,*(),倪晓晓2,李卫兵1   

  1. 1 青岛科技大学环境与安全工程学院,山东青岛266042
    2 青岛市城市排水监测站,山东青岛266002
  • 收稿日期:2015-08-07 发布日期:2015-12-04
  • 通讯作者: 邓晓燕 E-mail:deng_xiao_yan@126.com
  • 基金资助:
    国家自然科学基金(41376126);中国科学院海洋研究所海洋环境腐蚀与生物污损重点实验室开放基金

Fabrication of Carbon Dots Modified Porous ZnO Nanorods with Enhanced Photocatalytic Activity

Chang. FENG1,Xiao-Yan. DENG1,*(),Xiao-Xiao. NI2,Wei-Bing. LI1   

  1. 1 School of Environment and Safety Engineering, Qingdao University of Science and Technology, Qingdao 266042, Shandong Province, P. R. China
    2 Qingdao Municipal Drainage Monitoring Center, Qingdao 266002, Shandong Province, P. R. China
  • Received:2015-08-07 Published:2015-12-04
  • Contact: Xiao-Yan. DENG E-mail:deng_xiao_yan@126.com
  • Supported by:
    the National Natural Science Foundation of China(41376126);Foundation of Key Laboratory of MarineEnvironmental Corrosion and Bio-fouling, Institute of Oceanology, Chinese Academy of Sciences

摘要:

首先采用溶剂热法制备具有良好光催化降解性能的多孔ZnO纳米棒,随后采用化学沉积法在ZnO纳米棒表面修饰碳点,成功制备碳点修饰多孔ZnO纳米棒系列光催化剂.通过X射线衍射(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)、X射线光电子能谱(XPS)、紫外-可见(UV-Vis)分光光谱等技术对系列样品进行表征.通过测试系列样品在氙灯光源照射下,降解有机污染物(罗丹明B和苯酚)的光催化性能,发现碳点修饰多孔ZnO纳米棒能有效增强ZnO的光催化性能,其中质量分数为1.2%碳点修饰ZnO纳米棒(CZn1.2)表现出最高的光催化降解罗丹明B活性,为纯多孔ZnO纳米棒的2.5倍;同时,在氙灯光源照射下,碳点修饰多孔ZnO纳米棒具有很强的氧化性,能够催化苯环的开环反应,实现对苯酚的降解.其光催化活性的增强在于碳点修饰多孔ZnO光催化材料中,碳点作为光生电子受体,促进半导体光生电子与空穴的有效分离,从而增强光催化性能.

关键词: 半导体光催化, ZnO, 碳点, 降解有机污染物, 修饰光催化剂

Abstract:

Porous ZnO nanorods that displayed excellent photocatalytic degradation of organic pollutants (RhB and phenol) were prepared via a solvent thermal method followed by surface modification with carbon dots (C-dots) using a deposition method. The photocatalysts were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and ultraviolet-visible (UV-Vis) spectroscopy. The degradation of the organic pollutants using the nanorods was tested under Xe-light illumination and was enhanced following C-dot modification. Nanorods that were modified by the C-dots at a mass fraction of 1.2% (CZn1.2) exhibited the highest photocatalytic activity for the degradation of RhB, which was 2.5 times of the pure porous ZnO nanorods. Additionally, the modified nanorods with strangely oxidation ability could catalyze the degradation of phenol by open-rings reaction under Xe-light illumination. The improved photocatalytic activity was attributed to the effective separation of the photogenerated electrons and holes, in which the C-dots served as the receptor of the photogenerated electrons.

Key words: Semiconductor photocatalysis, ZnO, C-dots, Degradation of organic pollutants, Modified photocatalyst

MSC2000: 

  • O643