Effect of low frequency ultrasound on the surface properties of natural aluminosilicates |
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| Institution: | 1. Voronezh State University of Forestry and Technologies, 8 Timiryazeva Str., 394087 Voronezh, Russian Federation;2. Institut de Chimie des Milieux et Matériaux de Poitiers (IC2MP, UMR CNRS 7285), Université de Poitiers, 1, Rue Marcel Doré, TSA 41105, 86073 Poitiers Cedex 9, France;1. Department of Materials Science and Engineering, University of Sheffield, Sheffield, UK;2. Faraday Institution, Harwell Campus, Didcot, UK;3. Department of Pure and Applied Chemistry, The University of Strathclyde, Glasgow, UK;1. College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, China;2. Jiangsu-Singapore Joint Research Center for Organic/Bio-Electronics & Information Displays and Institute of Advanced Materials (IAM), Nanjing Tech University, Nanjing 211816, China;1. Sorbonne Université, CNRS, Istep, F75005, Paris, France;2. DiSTeM, University of Palermo, Via Archirafi 36, I90123, Palermo, Italy;3. Istituto Nazionale di Geofisica e Vulcanologia, Via U. La Malfa, 153, 90146, Palermo, Italy;4. Departamento de Geología, Centro de Investigación Científica y de Educación Superior de Ensenada, Carretera Tijuana-Ensenada No. 3918, Zona Playitas, Ensenada, Baja California, C.P. 22860, Mexico |
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| Abstract: | Structural and surface properties of different natural aluminosilicates (layered, chain and framework structural types) exposed of 20 kHz ultrasound irradiation (0–120 min) in aqueous and 35 wt%. aqueous H2O2 dispersions were studied by X-ray diffraction (XRD), dynamic light scattering (DLS), nitrogen adsorption–desorption, thermal analysis, and Fourier transform infrared spectroscopy (FTIR) techniques. It was confirmed that sonication caused slight changes in the structure of investigated minerals whereas their textural properties were significantly affected. The aqueous dispersions of montmorillonite (Mt), clinoptilolite (Zlt), glauconite (Glt) and palygorskite (Pal) were represented by several particles size fractions according to DLS-study. Ultrasound irradiation produced a decrease of the average particle diameter by 4–6 times in water and by 1.3–5 times in H2O2 dispersions except for Pal, which underwent strong agglomeration. A significant increase of total pore volume and pore diameter was observed for Glt sonicated in H2O2 dispersions whereas for Pal mainly micropore volume sharply increased in both aqueous and H2O2 dispersions. |
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| Keywords: | Natural aluminosilicates Ultrasound Dispersions Hydrogen peroxide Decrease of particles size Surface and structural characteristics |
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