1. Sol–gel synthesis of Al-doped TiO2 nanoparticles as UV filters with diminished photocatalytic activity for the application in sunscreen products.
- Author
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Ngoc, Tram Anh Nguyen, Ly, Thi Quynh Trang, Vo, Vuong Quynh Giao, Nguyen, Ngoc Bich, Nguyen, Quoc Thiet, Doan, Huan V., and Le, Tien Khoa
- Abstract
Al-doped TiO
2 nanoparticles with different Al contents were prepared by a simple sol–gel method and were applied as UV filters for sunscreen products. These materials were characterized by XRD, Raman, FESEM, N2 adsorption-desorption, WDXRF, FTIR, and UV–visible diffuse reflectance spectroscopy. Their color and photocatalytic activity were evaluated through CIE L*a*b* colorimetric method and the degradation of methylene blue under UV light, respectively. According to the results, the insertion of Al3+ ions into TiO2 successfully reduced the photocatalytic performance via the decrease in the mass fraction of rutile phase, the decrease in surface hydroxyl groups, and the increase in dislocation density. These Al-doped powders display better UV absorption than the undoped TiO2 , which can be attributed to the increase in anatase content and the decrease in particle size due to Al-doping. Consequently, the sunscreen using 4 mol% Al-doped TiO2 reveals the enhanced SPF value and improved color stability, which are suitable for UV protection cosmetics. Highlights: Preparation of Al-doped TiO2 nanoparticles by sol-gel method. Al-doping successfully reduces the photocatalytic activity of TiO2 . Al-doped TiO2 nanoparticles show high UV absorption and bright ivory-white color. Sunscreen using Al-doped TiO2 display high SPF values and high color stability. Al-doped TiO2 nanoparticles can be safety used as UV filters in sunscreens. [ABSTRACT FROM AUTHOR]- Published
- 2023
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