Co-BiVO4光催化剂的制备及其用于光催化氧化噻吩

doi:10.3724/SP.J.1077.2012.11796

无机材料学报 ›› 2012, Vol. 27 ›› Issue (10): 1073-1078.DOI: 10.3724/SP.J.1077.2012.11796 CSTR: 32189.14.SP.J.1077.2012.11796

Co-BiVO₄光催化剂的制备及其用于光催化氧化噻吩

高晓明¹, 付峰¹, 武玉飞¹, 张理平¹, 李稳宏²

(1. 延安大学化学与化工学院, 陕西省化学反应工程重点实验室, 延安 716000; 2. 西北大学化工学院, 西安 710069)

收稿日期:2011-12-22 修回日期:2012-03-01 出版日期:2012-10-20 网络出版日期:2012-09-17
基金资助:
国家自然科学基金(21003103); 陕西省教育厅自然科学研究项目(09JZ25); 延安大学自然科学青年专项基金(YD2011-19)

Preparation of Co-BiVO₄ Photocatalyst and Its Application in the Photocatalytic Oxidative Thiophene

GAO Xiao-Ming¹, FU Feng¹, WU Yu-Fei¹, ZHANG Li-Ping¹, LI Wen-Hong²

(1. College of Chemistry and Chemical Engineering, Shaanxi Key Laboratory of Chemical Reaction Engineering, Yan’an University, Yan’an 716000, China; 2. College of Chemical Engineering, Northwest University, Xi’an 710069, China)

Received:2011-12-22 Revised:2012-03-01 Published:2012-10-20 Online:2012-09-17
Supported by:
National Natural Science Foundation of China (21003103); Natural Science Program of Education Department of Shananxi Province(09JZ25); Natural Science Foundation Program of Yaan University (YD2011-19)

摘要/Abstract

摘要： 采用水热法制备了掺杂型可见光催化剂Co-BiVO₄, 用X射线衍射(XRD)、扫描电子显微镜(SEM)、紫外-可见漫反射(DRS)和低温氮吸附等表征手段对其结构性质进行了表征. 结果显示, Co的掺杂没有改变BiVO₄的晶相, 在pH=7时制备的Co-BiVO₄是单斜晶系白钨矿, 晶型较完整. 同时Co的掺杂延伸了BiVO₄的可见光吸收范围, 吸收边带明显红移, 能隙禁带宽窄于纯BiVO₄. 低温氮吸附表明Co-BiVO₄催化剂(pH=7)的孔半径主要分布在2.67 nm附近. 在空气–有机溶剂体系中, 研究了Co-BiVO₄氧化脱除FCC汽油中特征硫化物噻吩的效果. 实验结果表明, 催化剂加入量为1.0 mg/L, 空气通气量为150 mL/min, 氙灯光照3.0 h, Co-BiVO₄(pH=7.0)对模拟汽油的脱硫率可达到86%.

关键词: Co-BiVO₄, 光催化剂, 氧化脱硫, 噻吩

Abstract: The Co-BiVO₄photocatalyst was prepared by hydrothermal method and characterized by X-ray diffraction, scanning electron microscope, UV-Vis absorption spectroscope, and low-temperature N₂ adsorption. The characterized results indicate that highly crystalline monoclinic scheelite structure of Co-BiVO₄ is obtained at pH=7 and the Co dopant does not change the crystal phase of BiVO₄. The Co-BiVO₄ has a significant red-shift in the absorption band in the visible region, and its absorption intensity increases greatly for the doped catalyst compared with pure BiVO₄. Low-temperature N₂ adsorption result reveals that the pore size of the Cu-BiVO₄(pH=7) mostly distributes at 2.67 nm. The desulfurization ability of Co-BiVO₄ was researched by photocatalytic oxidation of thiophene in visible light. The results show that the Co-BiVO₄ photocatalysts exhibit higher photocatalytic activities for degradation of thiophene under visible light irradiation. When pH value is 7.0 and the hydrothermal synthesize time is 8 h, the photocatalytic activities reach the maximum. Under the conditions of 150 mL/min air flow, 1.0 mg/L catalyst amount, and visible light irradiation for 3 h in 400 W xenon lamp light, the desulfurization rate by Co-BiVO₄ at 600 mg/L initial concentration increases to 86%.

Key words: Co-BiVO₄, photocatalyst, oxidation desulfurization, thiophene

中图分类号:

TQ032

高晓明, 付峰, 武玉飞, 张理平, 李稳宏. Co-BiVO₄光催化剂的制备及其用于光催化氧化噻吩[J]. 无机材料学报, 2012, 27(10): 1073-1078.

GAO Xiao-Ming, FU Feng, WU Yu-Fei, ZHANG Li-Ping, LI Wen-Hong. Preparation of Co-BiVO₄ Photocatalyst and Its Application in the Photocatalytic Oxidative Thiophene[J]. Journal of Inorganic Materials, 2012, 27(10): 1073-1078.

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Co-BiVO₄光催化剂的制备及其用于光催化氧化噻吩

Preparation of Co-BiVO₄ Photocatalyst and Its Application in the Photocatalytic Oxidative Thiophene

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