Aerosol Spray Pyrolysis Synthesis of Porous Anatase TiO2 Microspheres with Tailored Photocatalytic Activity

doi:10.1007/s40195-018-0788-3

Acta Metallurgica Sinica (English Letters) ›› 2019, Vol. 32 ›› Issue (3): 286-296.DOI: 10.1007/s40195-018-0788-3

收稿日期:2018-02-26 修回日期:2018-08-08 出版日期:2019-03-10 发布日期:2019-02-22
作者简介:

Huan Liu is a Lecturer, Master’s Supervisor, College of Mechanics and Materials, Hohai University. He earned his Ph.D. from Southeast University in 2014 and then became a Lecturer in Hohai University. He was selected into the “Shuangchuang Program of Jiangsu Province” and “Dayu Scholars Program of Hohai University” in 2017. So far, he has published more than 30 scientific papers (indexed by SCI) and held 2 authorized Chinese patents. His papers were cited more than 200 times. His research interests mainly include design of high-strength and high ductility magnesium alloys, heat-resistant magnesium alloys, fabrication of fine-grained and ultra-fine-grained metallic materials, and biomedical materials.

Xian-Hua Chen is a Professor of Chongqing University and received his Doctor’s degree from Institute of Metal Research, Chinese Academy of Sciences in 2008. He is Director of Institute of Functional Mg Alloys in National Engineering Research Centre for Magnesium Alloys, Director of International Joint Laboratory for Light Alloys (Ministry of Education), Editorial Board of Acta Metallurgica Sinica (English Letters) (SCI). His research work is focused on new high-performance structural and functional magnesium alloys, and purification technology of magnesium alloys. He also worked in Materials Technology Laboratory of CANMET in Canada as visiting scientist during 2012-2013. He has 22 patents, 1 book and more than 60 SCI papers, including 2 science papers. His papers were cited more than 2700 times. He was awarded the Provincial and Ministerial S&T Prize in 2013, 2014 and 2017. He was the Chairman of “The 2nd China Youth Scholars Conference on Mg Alloys.”

Aerosol Spray Pyrolysis Synthesis of Porous Anatase TiO₂ Microspheres with Tailored Photocatalytic Activity

Wen-Ge Li¹, Yan-Jie Hu¹(), Hao Jiang¹, Chun-Zhong Li¹()

1 Key Laboratory for Ultrafine Materials of the Ministry of Education, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai 200237, China

Received:2018-02-26 Revised:2018-08-08 Online:2019-03-10 Published:2019-02-22

摘要/Abstract

Abstract:

Porous titanium dioxide (TiO₂) microspheres (MS) were prepared by a facile ultrasonic spray pyrolysis process with commercial colloidal silica as a sacrificial template. The morphology structure, Brunauer-Emmett-Teller surface areas and pore size distribution of TiO₂ microspheres were studied by changing the content and diameter of the silica template in detail. These porous micro-sized MS are composed of anatase TiO₂ nanocrystallites of 5-10 nm and have unique bimodal mesopores. The largest specific surface area of 112.3 m²/g has been achieved using 60 wt% 20 nm silica as a template. When used as photocatalysts, the best photocatalytic activity of the as-prepared porous MS is comparable to commercial P25 nanopowders. Moreover, the micro-size and tailored properties from the design that appear during the ultrasonic spray pyrolysis process give these porous MS a promising application in photocatalytic reaction.

Key words: Ultrasonic spray pyrolysis, TiO₂ microspheres, Porous structure, Photodegradation

. [J]. Acta Metallurgica Sinica (English Letters), 2019, 32(3): 286-296.

Wen-Ge Li, Yan-Jie Hu, Hao Jiang, Chun-Zhong Li. Aerosol Spray Pyrolysis Synthesis of Porous Anatase TiO₂ Microspheres with Tailored Photocatalytic Activity[J]. Acta Metallurgica Sinica (English Letters), 2019, 32(3): 286-296.

图/表 9

Fig. 1 Ultrasonic spray aerosol process used to synthesize TiO2/SiO2 microspheres

Fig. 2 XRD patterns of the obtained TiO2/SiO2 MS and porous TiO2 MS after HF etching (the mass ratio of SiO2/TiO2 = 0.6, 20, 60 and 110 nm silica as the template)

Fig. 3 a XPS general spectrum, b Ti 2p spectrum, c O 1s spectrum of TiO2 MS before and after HF etching (the mass ratio of SiO2/TiO2 = 0.6, 20 nm silica as template)

Fig. 4 TEM and HRTEM images of the as-prepared porous TiO2 MS

Fig. 5 EDS and element mapping of TiO2 MS a before and b after the removal of the colloidal silica template

Fig. 6 SEM images of the as-prepared TiO2 MS before and after HF etching with different mass ratios of SiO2/TiO2: a, b 20%; c, d 60%; e, f 100% (a, c, e: before etching)

Fig. 7 SEM images of a pure TiO2 MS and b-d porous TiO2 MS made from different colloidal silica template diameters: b 20 nm; c 60 nm; d 110 nm

Fig. 8 a, b Nitrogen adsorption-desorption isotherm profiles; c, d pore distribution curves of pure TiO2 MS and porous TiO2 MS made from silica template according to colloidal silicate template diameters

Fig. 9 a UV light-induced photodegradation of MB in aqueous solutions using P25 and TiO2 MS made by 20 nm silica template with different contents; b the influence of silica template’s size on the photocatalytic performance of porous TiO2 MS for the degradation of MB (the mass ratio of SiO2/TiO2 is 60%); c the catalytic stability of TiO2 MS in 6 cycles; d UV-Vis absorption curves of porous TiO2 MS made from different sizes of silica template; e illustrated photoscattering and photocatalytic process under UV light irradiation; f the PL spectrum of solid TiO2 MS and porous TiO2 MS (20, 60 and 110 nm silica as the template)

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Aerosol Spray Pyrolysis Synthesis of Porous Anatase TiO₂ Microspheres with Tailored Photocatalytic Activity

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