Bi2WO6/TiO2纳米复合材料对乙烯的光催化降解

doi:10.7503/cjcu20170601

高等学校化学学报 ›› 2018, Vol. 39 ›› Issue (5): 996.doi: 10.7503/cjcu20170601

Bi₂WO₆/TiO₂纳米复合材料对乙烯的光催化降解

王海丹, 王丽, 徐梅, 黄丽晨, 宋贤良

华南农业大学食品学院, 广州 510642

收稿日期:2017-09-04 出版日期:2018-04-21 发布日期:2018-04-21
作者简介:
联系人简介: 宋贤良, 男, 博士, 副教授, 主要从事纳米材料及其在食品中的应用研究. E-mail: songxl2000@163.com
基金资助:
国家自然科学基金(批准号: 31371855)、广东省现代农业产业共性技术创新团队项目(批准号: 2016LM2154)和广州市科技计划项目(批准号: 2014J4100150)资助.

Synthesis of Bi₂WO₆/TiO₂ Nanocomposites for the Photocatalytic Degradation of Ethylene^†

WANG Haidan, WANG Li, XU Mei, HUANG Lichen, SONG Xianliang^*

College of Food Science, South China Agricultural University, Guangzhou 510642, China

Received:2017-09-04 Online:2018-04-21 Published:2018-04-21
Contact: SONG Xianliang
Supported by:
Supported by the National Natural Science Foundation of China(No.31371855), the Team Project of Modern Agricultural Generic Techono-logy Innovation of Guangdong Province, China(No.016LM2154) and the Science and Technological Project of Guangzhou City, China(No.2014J4100150).

摘要/Abstract

摘要：

采用乙二醇溶剂热法制备了Bi₂WO₆/TiO₂纳米复合材料, 并利用X射线衍射仪(XRD), 透射电子显微镜(TEM), 扫描电子显微镜(SEM)和傅里叶变换红外光谱仪(FTIR)对其进行了表征. 结果表明, 纳米TiO₂附着在Bi₂WO₆表面, 通过两者表面基团的相互作用形成了异质结构; 与单一Bi₂WO₆相比, Bi₂WO₆/TiO₂的晶粒尺寸更小, 比表面积更大, 具有更高的光催化活性. 对乙烯的光催化降解结果表明, Bi₂WO₆/TiO₂在可见光和模拟太阳光下均表现出较强的光催化降解乙烯活性, 在可见光下催化降解乙烯的速率常数(K'值)可达9.312×10^-4 min^-1, 相比Bi₂WO₆和TiO₂分别提高了89.34%和884.25%.

关键词: 纳米复合材料, Bi₂WO₆, TiO₂, 乙烯, 可见光催化

Abstract:

Bi₂WO₆/TiO₂ nanocomposites were synthesized via solvent thermal method and characterized using X-ray powder diffractometer(XRD), scanning electron microscope(SEM), transmission electron microscope(TEM) and Fourier transform infared spectrometer(FTIR). The results show that TiO₂ nanoparticles can be attached to the surface of Bi₂WO₆ through the interaction of surface groups, thus leading to the hetergeneous structure. Moreover, the Bi₂WO₆/TiO₂ nanocomposites have smaller grain size and higher specific surface area compared with single Bi₂WO₆ nanoparticles, which can be contributed to the reinforcement of photocatalytic activity under visible light irradiation. Experiments on degradation of ethylene indicated that Bi₂WO₆/TiO₂ composites exhibited excellent photocatalytic performance under both simulated solar light irradiation and visible light irradiation. The rate constant K' of Bi₂WO₆/TiO₂ could reach up to 9.312×10^-4 min^-1 under visible light irradiation, which increased by 89.34% and 884.25% compared with sole Bi₂WO₆ and TiO₂, respectively.

Key words: Nanocomposite, Bi₂WO₆, TiO₂, Ethylene, Visible-light-induced photocatalysis

中图分类号:

O644

TrendMD:

王海丹, 王丽, 徐梅, 黄丽晨, 宋贤良. Bi₂WO₆/TiO₂纳米复合材料对乙烯的光催化降解. 高等学校化学学报, 2018, 39(5): 996.

WANG Haidan,WANG Li,XU Mei,HUANG Lichen,SONG Xianliang. Synthesis of Bi₂WO₆/TiO₂ Nanocomposites for the Photocatalytic Degradation of Ethylene^†. Chem. J. Chinese Universities, 2018, 39(5): 996.

图/表 7

Fig.1 Schematic diagram of platform for photocatalytic oxidation test of ethylene

Fig.2 XRD patterns of nano Bi2WO6(a), Bi2WO6/TiO2 nano-composites(b) and TiO2(c)

Fig.3 SEM, TEM and mapping images of nano Bi2WO6, TiO2 and Bi2WO6/TiO2 composites Note:(A) SEM images of TiO2; (B) SEM images of Bi2WO6; (C) SEM images of Bi2WO6/TiO2; (D) TEM images of TiO2; (E) TEM images of Bi2WO6; (F) and (G) TEM images of Bi2WO6/TiO2; (H) HRTEM image of Bi2WO6/TiO2; (I) mapping image of Bi2WO6/TiO2.

Fig.4 FTIR spctra of nano Bi2WO6(a), TiO2(b) and Bi2WO6/TiO2 composites(c)

Fig.5 Adsorption equilibrium curve for ethylene with pure ACF film and simulated solar light illumination(a) and with Bi2WO6/TiO2/ACF film without illumination(b)

Fig.6 Kinetic curves of degradation of ethylene with different photocatalyts under visible light irradiation(A) and simulated solar light irradiation(B)

Scheme 1 Mechanism for the degradation of ethylene with Bi2WO6/TiO2 nano-heterostructure under simulated solar light(A) and visible light(B) irradiation

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Bi₂WO₆/TiO₂纳米复合材料对乙烯的光催化降解

Synthesis of Bi₂WO₆/TiO₂ Nanocomposites for the Photocatalytic Degradation of Ethylene^†

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