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Carbon coated Au/TiO2 mesoporous microspheres: a novel selective photocatalyst

碳包覆 Au/TiO2介孔微球: 一种新型选择性光催化剂

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Abstract

Photocatalysts with desirable selectivity to transformation and purification of targeted pollutants are of great importance in water purification. Here, we demonstrate that selective photocatalysis can be realized by the assistance of gold-enhanced selective adsorption onto carbon-coated Au/TiO2 mesoporous microspheres (Au/TiO2@C-MM), which were prepared via a surfactant-assisted two-step method that involved the assembly of oleic acid-stabilized titania and gold nanoparticles into colloidal spheres in an emulsion using sodium dodecyl sulfate as a surfactant and the conversion of the surfactants into carbon under annealing in Ar. Due to the negatively charged amorphous carbon, the mesoporous structure, and the surface plasmon resonance absorption of the Au components, the Au/TiO2@C-MM shows enhanced charge- and size-selective adsorption properties, which enables the materials to have high selectivity in the photocatalytic process.

摘要

选择性光催化剂的开发对于污水处理等环境问题具有重要意义. 本文利用十二烷基硫酸钠作为表面活性剂, 油相Au和TiO2纳米颗粒为前驱体, 经微乳液自组装-表面活性剂碳化两步法, 成功合成了碳包覆Au/TiO2介孔微球(Au/TiO2@C-MM)复合光催化剂材料. 得益于负电荷无定形碳、介孔结构和Au表面等离子体共振特性, Au/TiO2@C-MM在光催化过程中表现出优异的尺寸和电荷选择性.

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Acknowledgments

This work was supported by the National Natural Science Foundation of China (21271019 and 21641005), Beijing Engineering Center for Hierarchical Catalysts, the Fundamental Research Funds for the Central Universities (YS1406), the Program for Changjiang Scholars and Innovative Research Team in the University (IRT1205) and the long-term subsidy mechanism from the Ministry of Finance and the Ministry of Education of China and the National Program on Key Basic Research Project (2014CB932104).

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Authors and Affiliations

  1. State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing, 100029, China

    Wenxian Liu  (刘文贤), Zhiying Liu  (刘芷莹), Guannan Wang  (王冠男), Xiaoming Sun  (孙晓明), Yaping Li  (李亚平) & Junfeng Liu  (刘军枫)

  2. Department of Engineering, National University of Singapore, Singapore, 117581, Singapore

    Guannan Wang  (王冠男)

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  1. Wenxian Liu  (刘文贤)
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  2. Zhiying Liu  (刘芷莹)
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  3. Guannan Wang  (王冠男)
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  4. Xiaoming Sun  (孙晓明)
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  5. Yaping Li  (李亚平)
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  6. Junfeng Liu  (刘军枫)
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Correspondence to Junfeng Liu  (刘军枫).

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Wenxian Liu received his BSc degree from Tianjin University in 2012. Now he is a PhD candidate under the supervision of Prof. Junfeng Liu at Beijing University of Chemical Technology (BUCT). His research interests are related to the preparation of porous nanomaterials and their applications in catalysis.

Junfeng Liu received her BSc and PhD degrees in chemistry from Tsinghua University in 2002 and 2007, respectively. She joined the faculty of State Key Laboratory of Chemical Resource Engineering, BUCT in 2008. Her research interests focus on controlled synthesis of nanostructured materials and their applications in catalysis, energy and environmental applications.

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Liu, W., Liu, Z., Wang, G. et al. Carbon coated Au/TiO2 mesoporous microspheres: a novel selective photocatalyst. Sci. China Mater. 60, 438–448 (2017). https://doi.org/10.1007/s40843-017-9020-5

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  • DOI: https://doi.org/10.1007/s40843-017-9020-5

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