Cu3B2O6/CuB2O4单晶的制备及其可见光催化降解亚甲基蓝

doi:10.3866/PKU.WHXB201407011

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

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

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

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/Abstract

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（E_g=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 (E_g=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

陈爱民, 薄盈盈, 邵晨熠, 汪晶, 胡军. Cu₃B₂O₆/CuB₂O₄单晶的制备及其可见光催化降解亚甲基蓝[J]. 物理化学学报, 2014, 30(9): 1713-1719.

CHEN Ai-Min, BO Ying-Ying, SHAO Chen-Yi, WANG Jing, HU Jun. Synthesis of Single-Crystalline Cu₃B₂O₆/CuB₂O₄ and Their Photocatalytic Degradation of Methylene Blue under Visible-Light Irradiation[J]. Acta Phys. -Chim. Sin., 2014, 30(9): 1713-1719.

链接本文: https://www.whxb.pku.edu.cn/CN/10.3866/PKU.WHXB201407011

https://www.whxb.pku.edu.cn/CN/Y2014/V30/I9/1713

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Cu₃B₂O₆/CuB₂O₄单晶的制备及其可见光催化降解亚甲基蓝

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

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