物理化学学报 >> 2014, Vol. 30 >> Issue (9): 1713-1719.doi: 10.3866/PKU.WHXB201407011

催化和表面科学 上一篇    下一篇

Cu3B2O6/CuB2O4单晶的制备及其可见光催化降解亚甲基蓝

陈爱民, 薄盈盈, 邵晨熠, 汪晶, 胡军   

  1. 浙江工业大学化学工程学院, 杭州 310014
  • 收稿日期:2014-04-23 修回日期:2014-07-01 发布日期:2014-08-29
  • 通讯作者: 陈爱民, 胡军 E-mail:amchen@zjut.edu.cn;hjzjut@zjut.edu.cn
  • 基金资助:

    浙江省自然科学基金(LQ12E02009,LY13E020009)资助项目

Synthesis of Single-Crystalline Cu3B2O6/CuB2O4 and Their Photocatalytic Degradation of Methylene Blue under Visible-Light Irradiation

CHEN Ai-Min, BO Ying-Ying, SHAO Chen-Yi, WANG Jing, HU Jun   

  1. College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, P. R. China
  • Received:2014-04-23 Revised:2014-07-01 Published:2014-08-29
  • Contact: CHEN Ai-Min, HU Jun E-mail:amchen@zjut.edu.cn;hjzjut@zjut.edu.cn
  • Supported by:

    The project was supported by the Natural Science Foundation of Zhejiang Province, China (LQ12E02009, LY13E020009).

摘要:

以醋酸铜/硝酸铜和硼酸为原料,柠檬酸作发泡剂,采用溶胶-凝胶法制得了高纯度的单晶结构硼酸铜(Cu3B2O6/CuB2O4). 利用X射线衍射(XRD)、扫描电镜(SEM)、高分辨率透射电镜(HRTEM)、热重-差热分析(TGDTA)等对样品进行了表征,并考察了Cu3B2O6/CuB2O4在可见光(400 nm<λ<1100 nm)下对亚甲基蓝(MB)溶液的催化降解性能. 结果表明,两种结构的硼酸铜都具有良好的光催化性能. 当亚甲基蓝的初始浓度为50 mg·L-1,催化剂用量为1 g·L-1,光照6 h后,CuB2O4对亚甲基蓝的光催化降解率为63.36%,Cu3B2O6对亚甲基蓝的光催化降解率为99.52%. 紫外-可见漫反射光谱(UV-Vis DRS)结果表明,Cu3B2O6的中间能态宽度为1.78 eV,小于CuB2O4的中间能态宽度(1.95 eV),且Cu3B2O6的禁带宽度较窄(Eg=2.34 eV),不仅可以发生价带顶与中间能态的电子跃迁,同时可以发生禁带间的电子跃迁,所以Cu3B2O6比CuB2O4具有更高的可见光催化性能.

关键词: 溶胶-凝胶, 硼酸铜, 可见光催化, 亚甲基蓝

Abstract:

Single-crystalline Cu3B2O6/CuB2O4 was successfully prepared by a sol-gel method fromcupric nitrate/ cupric acetate and boric acid, using citric acid as a foaming agent. The obtained materials were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM), and thermogravimetry-differential thermal analysis (TG-DTA). The photodegradation of methylene blue (MB) solution was used to evaluate the photocatalytic activity of Cu3B2O6/CuB2O4 under visiblelight irradiation (400 nm<λ<1100 nm). The results indicated that both Cu3B2O6 and CuB2O4 displayed good photocatalytic activity. Under visible-light irradiation for 6 h, the photocatalytic activities of CuB2O4 and Cu3B2O6 reached 63.36% and 99.52%, respectively, in MB aqueous solution (50 mg·L-1) containing 1 g·L-1 catalyst. Ultraviolet-visible analysis showed that the width of the midgap state for Cu3B2O6 is 1.78 eV, which is much narrower than that of CuB2O4 (1.95 eV), and the band gap of Cu3B2O6 is narrow (Eg=2.34 eV). These results indicated that electron transitions can occur in both the midgap state and forbidden band for Cu3B2O6; this is why Cu3B2O6 has higher visible-light photocatalytic activity than CuB2O4.

Key words: Sol-gel, Copper borate, Visible-photocatalysis, Methylene blue

MSC2000: 

  • O641