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化学学报
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化学学报 ›› 2010, Vol. 68 ›› Issue (9): 858-864. 上一篇    下一篇

研究论文

双介孔结构的纳米TiO2/I2复合材料的制备及其可见光催化性能

许璞1，高善民*,1,2，徐彦宾1,2，黄柏标2，戴瑛2，于忠玺1，王玉宝1   

  1. (1鲁东大学化学与材料科学学院 烟台 264025)
    (2山东大学晶体材料国家重点实验室 济南 250100)
  • 投稿日期:2009-07-07 修回日期:2009-12-11 发布日期:2009-12-29
  • 通讯作者: 高善民 E-mail:gaosm212@yahoo.com.cn
  • 基金资助:

    国家重点基础研究发展计划(2007CB613302); 山东省中青年科学家科研奖励基金(2007BS04040); 山东省教育厅科研计划(J07WA04)资助项目.

Preparation and Visible Light Photocatalytic Activity of Bimodal Mesoporous TiO2/I2 Composite Nanomaterials

Xu Pu1 Gao Shanmin*,1,2 Xu Yanbin1,2 Huang Baibiao2, Dai Ying2 Yu Zhongxi1 Wang Yubao1   

  1. (1 School of Chemistry and Materials Science, Ludong University, Yantai 264025)
    (2 State Key Lab of Crystal Materials, Shandong University, Jinan 250100)
  • Received:2009-07-07 Revised:2009-12-11 Published:2009-12-29

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以钛酸丁酯为前驱体, 碘溶胶为碘源, 在室温下采用水解沉淀法制备了单质碘和纳米TiO<sub>2</sub>复合的双介孔结构光催化剂(M-I<sub>2</sub>-TiO<sub>2</sub>). 采用X射线衍射(XRD)、透射电子显微镜(TEM)、比表面分析(BET)、紫外-可见(UV-Vis)漫反射光谱和傅里叶变换-红外光谱(FT-IR)对M-I<sub>2</sub>-TiO<sub>2</sub>进行了表征. 以次甲基蓝(MB)溶液为模拟废水, 对M-I<sub>2</sub>-TiO<sub>2</sub>的光催化性能进行了评价, 研究了不同热处理温度对光催化活性的影响. 结果表明, M-I<sub>2</sub>-TiO<sub>2</sub>在可见光区有显著的吸收, 300 ℃热处理得到的样品比表面积高达227.6 m<sup>2</sup>/g, 600 ℃热处理所得样品的比表面积仍高达111.8 m<sup>2</sup>/g, 而400 ℃热处理所得样品具有最好的光催化降解性能. 双介孔结构纳米TiO<sub>2</sub>/I<sub>2</sub>复合材料的光催化降解性能显著高于相同方法制备的纯TiO<sub>2</sub>和Degussa P-25商业产品. 催化剂经6次重复使用其光催化活性基本保持不变.

关键词: TiO2, 碘, 介孔, 复合, 光催化

An accessible, template-free process to fabricate bimodal mesoporous TiO2/I2 composite nanocrystallites was developed by using tetrabutylorthotitanate [TiO(C4H9)4, TBOT] and iodine hydrosol as precursor by hydrolysis precipitation method. The samples were characterized by XRD, TEM, BET, UV-Vis-DRS and FT-IR, respectively. The relation of the heat treatment temperatures and the photocatalysis activity of M-I2-TiO2 were also studied. The photocatalytic activity of samples was evaluated by degradation of methylene blue (MB) as target pollutant. The results show that the bimodal mesoporous structured M-I2-TiO2 exhibited stronger absorption in visible light region. The specific surface area of the bimodal mesoporous I2-doped TiO2 thermal treatment in air at 300 ℃ exceeded 227.6 m2/g, and that of the samples thermal treatment in air at 600 ℃ still have 111.8 m2/g, which indicated the samples have relative high thermal stability. The TiO2/I2 composite sample thermal treatment at 400 ℃ manifested the highest photocatalytic activity for photodecomposition of MB solution compared with thermal treatment at other temperatures, the uncomposite TiO2 and Degussa P-25 under the irradiation of visible-light. Little difference of the activity was observed between the samples used for 6 times.

Key words: TiO2, I2, mesoporous, composite, photocatalytic

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