Direct Hydrothermal Processing of TiO2 Nanofibers from Natural Rutile Sand

2019 ◽  
Vol 1 (15) ◽  
pp. 19-27 ◽  
Author(s):  
Sorapong Pavasupree ◽  
Yoshikazu Suzuki ◽  
Susumu Yoshikawa ◽  
Ryoji Kawahata
Keyword(s):  
Hydrothermal Processing ◽  
Tio2 Nanofibers ◽  
Natural Rutile

Direct Hydrothermal Processing of Long Titanate Nanofibers from Natural Rutile

2006 ◽  
Vol 317-318 ◽  
pp. 243-246 ◽  
Author(s):  
Yoshikazu Suzuki ◽  
Sorapong Pavasupree ◽  
Susumu Yoshikawa ◽  
Ryoji Kawahata
Keyword(s):  
Electron Microscopy ◽  
Low Cost ◽  
High Yield ◽  
Hydrothermal Processing ◽  
Reaction Step ◽  
X Ray ◽  
Sodium Hydrogen ◽  
Transmission Electron ◽  
Vis Spectroscopy ◽  
Natural Rutile

Via the direct hydrothermal processing using natural rutile as a starting material, long titanate nanofibers (typically 10-500 μm in length and 20-50 nm in diameter) have been successfully synthesized in high yield Transmission electron microscopy (TEM), energy dispersive X-ray spectroscopy (EDS), electron diffraction, and UV-Vis spectroscopy demonstrated that the as-synthesized nanofibers presumably consisted of sodium hydrogen trititanate ((Na,H)2Ti3O7, e.g., Na0.4H1.6Ti3O7) including some hexatitanate-type defects ((Na,H)2Ti6O13). The direct hydrothermal treatment for natural rutile will be a promising low-cost processing for 1-D nanomaterials, which can act not only as the reaction step but also as the purification.

Natural rutile-derived titanate nanofibers prepared by direct hydrothermal processing

2005 ◽  
Vol 20 (4) ◽  
pp. 1063-1070 ◽  
Author(s):  
Yoshikazu Suzuki ◽  
Sorapong Pavasupree ◽  
Susumu Yoshikawa ◽  
Ryoji Kawahata
Keyword(s):  
Low Cost ◽  
High Yield ◽  
Hydrothermal Processing ◽  
X Ray Diffraction ◽  
Post Heat Treatment ◽  
One Dimensional ◽  
X Ray ◽  
Sodium Hydrogen ◽  
Transmission Electron ◽  
Natural Rutile

Long titanate nanofibers (typically 10–500 μm in length and 20–50 nm in diameter) were successfully prepared in high yield by the direct hydrothermal processing using natural rutile as a starting material. Fourier transform infrared spectroscopy, transmission electron microscopy, energy dispersive x-ray spectroscopy, electron diffraction, and x-ray diffraction demonstrated that the as-synthesized nanofibers presumably consisted of sodium hydrogen trititanate [(Na,H)2Ti3O7, e.g., Na0.4H1.6Ti3O7] including some hexatitanate-type defects [(Na,H)2Ti6O13]. A partial topotactic condensation model explained their nanostructure well. Although the as-synthesized fibers are defective, they can be cured by a post-heat-treatment in air. The direct hydrothermal treatment for natural rutile will be a promising low-cost process for one-dimensional nanomaterials, which can act not only as a reaction step but also as a purification step.

Synthesis of titanate, TiO2 (B), and anatase TiO2 nanofibers from natural rutile sand

2005 ◽  
Vol 178 (10) ◽  
pp. 3110-3116 ◽  
Author(s):  
Sorapong Pavasupree ◽  
Yoshikazu Suzuki ◽  
Susumu Yoshikawa ◽  
Ryoji Kawahata
Keyword(s):  
Anatase Tio2 ◽  
Tio2 Nanofibers ◽  
Natural Rutile

Bench-Scale Evaluation of the Genifuel Hydrothermal Processing Technology for Wastewater Solids

2017 ◽  
Vol 2017 (9) ◽  
pp. 3032-3061 ◽  
Author(s):  
P.A Marrone ◽  
D.C Elliott ◽  
J.M Billing ◽  
R.T Hallen ◽  
T.R Hart ◽  
...  
Keyword(s):  
Processing Technology ◽  
Hydrothermal Processing ◽  
Scale Evaluation ◽  
Bench Scale

Electrospun-based TiO2 nanofibers for organic pollutant photodegradation: a comprehensive review

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Khee Chung Hui ◽  
Hazwani Suhaimi ◽  
Nonni Soraya Sambudi
Keyword(s):  
Visible Light ◽  
Organic Pollutants ◽  
Organic Pollutant ◽  
Hollow Fibers ◽  
Promising Alternative ◽  
Tio2 Nanofibers ◽  
As Doping ◽  
Secondary Pollutants ◽  
Photocatalytic Reactors ◽  
Light Area

Abstract Titanium dioxide (TiO2) is commonly used as a photocatalyst in the removal of organic pollutants. However, weaknesses of TiO2 such as fast charge recombination and low visible light usage limit its industrial application. Furthermore, photocatalysts that are lost during the treatment of pollutants create the problem of secondary pollutants. Electrospun-based TiO2 fiber is a promising alternative to immobilize TiO2 and to improve its performance in photodegradation. Some strategies have been employed in fabricating the photocatalytic fibers by producing hollow fibers, porous fibers, composite TiO2 with magnetic materials, graphene oxide, as well as doping TiO2 with metal. The modification of TiO2 can improve the absorption of TiO2 to the visible light area, act as an electron acceptor, provide large surface area, and promote the phase transformation of TiO2. The improvement of TiO2 properties can enhance carrier transfer rate which reduces the recombination and promotes the generation of radicals that potentially degrade organic pollutants. The recyclability of fibers, calcination effect, photocatalytic reactors used, operation parameters involved in photodegradation as well as the commercialization potential of TiO2 fibers are also discussed in this review.

scholarly journals Synthesis of KAlSiO4 by Hydrothermal Processing on Biotite Syenite and Dissolution Reaction Kinetics

Minerals ◽  
2020 ◽  
Vol 11 (1) ◽  
pp. 36
Author(s):  
Jiangyan Yuan ◽  
Hongwen Ma ◽  
Zheng Luo ◽  
Xi Ma ◽  
Qian Guo
Keyword(s):  
Reaction Rate ◽  
Reaction Order ◽  
Dissolution Behavior ◽  
Precipitation Process ◽  
Hydrothermal Processing ◽  
Hydrothermal Conditions ◽  
Effective Utilization ◽  
Comprehensive Utilization ◽  
Dissolution Reaction ◽  
Significant Process

To make potassium from K-bearing rocks accessible to agriculture, processing on biotite syenite powder under mild alkaline hydrothermal conditions was carried out, in which two types of KAlSiO4 were obtained successfully. The dissolution-precipitation process of silicate rocks is a significant process in lithospheric evolution. Its effective utilization will be of importance for realizing the comprehensiveness of aluminosilicate minerals in nature. Two kinds of KAlSiO4 were precipitated in sequence during the dissolution process of biotite syenite. The crystal structures of two kinds of KAlSiO4 were compared by Rietveld structure refinements. The kinetics model derived from geochemical research was adopted to describe the dissolution behavior. The reaction order and apparent activation energy at the temperature range of 240–300 °C were 2.992 and 97.41 kJ/mol, respectively. The higher dissolution reaction rate of K-feldspar mainly relies on the alkaline solution, which gives rise to higher reaction order. During the dissolution-precipitation process of K-feldspar, two types of KAlSiO4 with different crystal structure were precipitated. This study provides novel green chemical routes for the comprehensive utilization of potassium-rich silicates.

Formation of poly(vinyl alcohol)-titanium lactate hybrid nanofibers and properties of TiO2 nanofibers obtained by calcination of the hybrids

2007 ◽  
Vol 104 (2) ◽  
pp. 1232-1235 ◽  
Author(s):  
Koji Nakane ◽  
Kaori Yasuda ◽  
Takashi Ogihara ◽  
Nobuo Ogata ◽  
Shinji Yamaguchi
Keyword(s):  
Vinyl Alcohol ◽  
Poly Vinyl Alcohol ◽  
Tio2 Nanofibers ◽  
Hybrid Nanofibers
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