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Title: Solvent effects on microstructures and properties of three-dimensional hierarchical TiO{sub 2} microsphere structures synthesized via solvothermal approach

Abstract

One-step solvothermal method has been proved to be a simple and efficient route to synthesize three-dimensional (3D) hierarchical TiO{sub 2} microsphere structures, but discrepant properties of the solvent media had been claimed as the major factors determining microstructures and properties of the final products. In this study, several typical solvents, including alkane, aromatic hydrocarbons, halohydrocarbon, ketone, organic acid, mono- and dihydric alcohols, were selected to comprehensively investigate the effect of solvents on the morphology, crystal structure, specific surface area, porous property and light harvesting capability of the final products. According to the experimental results, a good interface separating titanium precursor with aqueous phase in the reaction solution, created by non-polar solvents, or polar solvents which are immiscible with titanium precursor, was the decisive factor for the formation of quasi-3D urchin-like TiO{sub 2} microspheres self-assembled from one-dimensional (1D) nanostructures, and concentrated H{sup +} induced by organic acid medium was also helpful. Meanwhile, without the liquid-liquid interface or extremely low solution pH, anatase TiO{sub 2} sphere structures with big specific surface area comprising of nanoparticles or nanosheets would be formed, and performed well in photodegradation of pollutants in water. - Graphical abstract: A good interface separating titanium precursor with aqueous phase ismore » the determining factor to form 3D ordered TiO{sub 2} microspheres self-assembled by 1D nanostructures via solvothermal reaction. Display Omitted - Highlights: • Solvent property is important for the solvothermally synthesized TiO{sub 2} products. • Interface separating titanium precursor with aqueous phase is a determining factor. • Dielectric constant of solvents is also very important. • Low solution pH is helpful for the formation of rod-like building block structures.« less

Authors:
; ; ; ; ;
Publication Date:
OSTI Identifier:
22742032
Resource Type:
Journal Article
Journal Name:
Journal of Solid State Chemistry
Additional Journal Information:
Journal Volume: 253; Other Information: Copyright (c) 2017 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0022-4596
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; DIELECTRIC MATERIALS; HYDROGEN IONS 1 PLUS; HYDROTHERMAL SYNTHESIS; INTERFACES; MICROSPHERES; MICROSTRUCTURE; NANOSTRUCTURES; ORGANIC ACIDS; OXIDATION; POROUS MATERIALS; PRECURSOR; SOLVENT PROPERTIES; SPECIFIC SURFACE AREA; THREE-DIMENSIONAL CALCULATIONS; THREE-DIMENSIONAL LATTICES; TITANIUM OXIDES

Citation Formats

Xu, Shiping, Sun, Xiang, Gao, Yuan, Yue, Min, Yue, Qinyan, and Gao, Baoyu. Solvent effects on microstructures and properties of three-dimensional hierarchical TiO{sub 2} microsphere structures synthesized via solvothermal approach. United States: N. p., 2017. Web. doi:10.1016/J.JSSC.2017.05.001.
Xu, Shiping, Sun, Xiang, Gao, Yuan, Yue, Min, Yue, Qinyan, & Gao, Baoyu. Solvent effects on microstructures and properties of three-dimensional hierarchical TiO{sub 2} microsphere structures synthesized via solvothermal approach. United States. doi:10.1016/J.JSSC.2017.05.001.
Xu, Shiping, Sun, Xiang, Gao, Yuan, Yue, Min, Yue, Qinyan, and Gao, Baoyu. Fri . "Solvent effects on microstructures and properties of three-dimensional hierarchical TiO{sub 2} microsphere structures synthesized via solvothermal approach". United States. doi:10.1016/J.JSSC.2017.05.001.
@article{osti_22742032,
title = {Solvent effects on microstructures and properties of three-dimensional hierarchical TiO{sub 2} microsphere structures synthesized via solvothermal approach},
author = {Xu, Shiping and Sun, Xiang and Gao, Yuan and Yue, Min and Yue, Qinyan and Gao, Baoyu},
abstractNote = {One-step solvothermal method has been proved to be a simple and efficient route to synthesize three-dimensional (3D) hierarchical TiO{sub 2} microsphere structures, but discrepant properties of the solvent media had been claimed as the major factors determining microstructures and properties of the final products. In this study, several typical solvents, including alkane, aromatic hydrocarbons, halohydrocarbon, ketone, organic acid, mono- and dihydric alcohols, were selected to comprehensively investigate the effect of solvents on the morphology, crystal structure, specific surface area, porous property and light harvesting capability of the final products. According to the experimental results, a good interface separating titanium precursor with aqueous phase in the reaction solution, created by non-polar solvents, or polar solvents which are immiscible with titanium precursor, was the decisive factor for the formation of quasi-3D urchin-like TiO{sub 2} microspheres self-assembled from one-dimensional (1D) nanostructures, and concentrated H{sup +} induced by organic acid medium was also helpful. Meanwhile, without the liquid-liquid interface or extremely low solution pH, anatase TiO{sub 2} sphere structures with big specific surface area comprising of nanoparticles or nanosheets would be formed, and performed well in photodegradation of pollutants in water. - Graphical abstract: A good interface separating titanium precursor with aqueous phase is the determining factor to form 3D ordered TiO{sub 2} microspheres self-assembled by 1D nanostructures via solvothermal reaction. Display Omitted - Highlights: • Solvent property is important for the solvothermally synthesized TiO{sub 2} products. • Interface separating titanium precursor with aqueous phase is a determining factor. • Dielectric constant of solvents is also very important. • Low solution pH is helpful for the formation of rod-like building block structures.},
doi = {10.1016/J.JSSC.2017.05.001},
journal = {Journal of Solid State Chemistry},
issn = {0022-4596},
number = ,
volume = 253,
place = {United States},
year = {2017},
month = {9}
}