Microwave-assisted synthesis of TiO2 nanoparticles: photocatalytic activity of powders and thin films
- 583 Downloads
A simple, rapid, and effective synthesis methodology for the preparation of high-performance TiO2 nanoparticles and thin films by combining colloidal sol-gel and microwave-assisted hydrothermal synthesis was developed. The obtained results indicate that the heating with microwaves at 180 °C for 20 min was enough to synthesize crystalline TiO2 nanoparticles, presenting anatase as a major phase with a crystal size of ~ 7 nm and a specific surface area of 220 m2 g−1. A secondary thermal treatment improved the crystallinity and induced the anatase-to-rutile transformation. The highest photocatalytic activity was found for the as-synthesized powder without any additional thermal treatment. Thin films were also prepared by dip-coating and its high photocatalytic activity showed a kinetic curve comparable to that of a thin film of commercial TiO2 powder prepared under similar conditions.
KeywordsTiO2 Nanoparticles Microwave synthesis Thin films Photocatalysis
The authors thank the resources provided by CAPES under the International Cooperation Program Science without Borders for Special Guest Researcher, PVE (MEC/MCTI/CAPES/CNPQ/FAP/71/2013), Project No. A011/2013.
This work was supported by Ministerio de Economía, Industria y Competitividad (Government of Spain) and FEDER Funds under the Grant No. MAT2015-67586-C3-2-R and CTM2015-69246-R.
Compliance with ethical standards
Conflict of interest
The authors declare that they have no conflict of interest.
- Cortéz-Lorenzo A, Escamilla-Perea L, Esquivel-Escalante K, Velázquez-Castillo R (2017) Modified gelcasting of microwave assisted synthesized sulfur-doped anatase for photocatalytic degradation of organic compounds. Catal Today 282:159–167. https://doi.org/10.1016/j.cattod.2016.10.015 CrossRefGoogle Scholar
- Hou Y, Yang J, Jiang Q, Li W, Zhou Z, Li X, Zhou S (2016) Enhancement of photovoltaic performance of perovskite solar cells by modification of the interface between the perovskite and mesoporous TiO2 film. Sol Energy Mater Sol Cells 155:101–107. https://doi.org/10.1016/j.solmat.2016.05.004 CrossRefGoogle Scholar
- Jiang H, Liu Y, Zang S, Li J, Wang H (2015) Microwave-assisted hydrothermal synthesis of Nd, N, and P tri-doped TiO2 from TiCl4 hydrolysis and synergetic mechanism for enhanced photoactivity under simulated sunlight irradiation. Mater Sci Semicond Process 40:822–831. https://doi.org/10.1016/j.mssp.2015.07.069 CrossRefGoogle Scholar
- Kim HK, Mhamane D, Kim MS, Roh HK, Aravindan V, Madhavi S, Roh KC, Kim KB (2016) TiO2-reduced graphene oxide nanocomposites by microwave-assisted forced hydrolysis as excellent insertion anode for Li-ion battery and capacitor. J Power Sources 327:171–177. https://doi.org/10.1016/j.jpowsour.2016.07.053 CrossRefGoogle Scholar
- Kobayashi M, Tomita K, Petrykin V, Yin S, Sato T, Yoshimura M, Kakihana M (2007) Hydrothermal synthesis of nanosized titania photocatalysts using novel water-soluble titanium complexes. Solid State Phenom 124–126:723–726. https://doi.org/10.4028/www.scientific.net/SSP.124-126.723 CrossRefGoogle Scholar
- Shen Z, Wang G, Tian H, Sunarso J, Liu L, Liu J, Liu S (2016) Bi-layer photoanode films of hierarchical carbon-doped brookite-rutile TiO2 composite and anatase TiO2 beads for efficient dye-sensitized solar cells. Electrochim Acta 216:429–437. https://doi.org/10.1016/j.electacta.2016.09.047 CrossRefGoogle Scholar
- Sun S, Zhang J, Gao P, Wang Y, Li X, Wu T, Wang Y, Chen Y, Yang P (2017) Full visible-light absorption of TiO2 nanotubes induced by anionic S2 2− doping and their greatly enhanced photocatalytic hydrogen production abilities. Appl Catal B Environ 206:168–174. https://doi.org/10.1016/j.apcatb.2017.01.027 CrossRefGoogle Scholar