氟化铵对纳米金红石型钛硅复合氧化物表面改性研究

doi:10.13218/j.cnki.csdc.2018.05.008

Abstract

Abstract: Rutile-TiO₂-SiO₂ nanocomposites were synthesized by an improved hydrolysis-coprecipitation method using sodium metasilicate and titanium oxysulfate as precursors.Using hydrothermal method,the obtained nanocomposites were further modified by ammonium fluoride (NH₄F) in different solvents.The effects of solvents on modification were studied by characterization of the modified nanocomposites by X-ray diffraction,fourier transform infrared spectra,scanning electron microscopy,atomic force microscope and contact angle (CA) measurements.Results show that,the rutile-TiO₂-SiO₂ modified by NH₄F in isopropanol exhibits large specific surface area and has good surface properties,due to the cooperative factors happening at the surface,such as the formation of Si-F bonds,the micro/nano hierarchical rough structure and the self-assembly of isopropanol.Its specific surface area is 332 m²/g,and the contact angles of water and diiodomethane are 147.1° and 147.2°,respectively.

Key words: ammonium fluoride, surface modification, titania-silica composites, isopropanol

CLC Number:

O648

ZHAO Shu-fang, HOU Lei-xin, LIU Dan-dan, FANG Li, CHENG Fang-qin. Surface modification of rutile titania-silica nanocomposites by ammonium fluoride[J].China Surfactant Detergent & Cosmetics, 2018, 48(5): 283-287.

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Surface modification of rutile titania-silica nanocomposites by ammonium fluoride

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