Crystallization Behavior and Microstructure of Hydrothermally Treated Monodispersed Titanium Dioxide Particles

Kondô, Masao; Shinozaki, Kazuo; Ooki, Rokuro; Mizutani, Nobuyasu

doi:10.2109/jcersj.102.742

Cited by 28 publications

(19 citation statements)

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“…2 and Table 1). The behavior of T/GS-10 may be explained as formation and growth of rutile crystals during hydrothermal aging (in acidic medium), which proceeded at the expenses of anatase crystals, possibly via a dissolution-precipitation mechanism [37] or by condensation of the anatase nanoparticles where, during the growth of small anatase particles by ripening, a join of their (112) facets is produced. However, this explanation does not account for the different behavior observed in the rest of samples of this series (T/GS-5, and T/GS-20) and, to this moment, we do not have a clear explanation for this feature.…”

Section: X-ray Diffractionmentioning

confidence: 99%

Enhanced photocatalytic degradation of methylene blue: Preparation of TiO2/reduced graphene oxide nanocomposites by direct sol-gel and hydrothermal methods

Atout

Álvarez

Chebli

et al. 2017

Materials Research Bulletin

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Highlights• TiO2-RGO nanocomposites presented, in all the cases studied, improved photocatalytic properties compared to bare TiO2.• An optimal composition, in terms of TiO2/RGO ratio was found in both series of nanocomposites; however, superior activity was found for those prepared by direct sol-gel route.• Nanocomposites prepared by sol-gel method presented improved textural properties than those prepared following a hydrothermal route.• Optimization in the preparation of hybrid photocatalystsis needed to obtain materials with finer properties for effective application in environmental AbstractIn this study, two different preparation methods of titanium dioxide nanoparticles/reduced graphene oxide nanocomposites were investigated using direct sol-gel method followed by 3 hydrothermal treatment or simple hydrothermal route. A different amount of graphene (1-20%) was mixed with TiO2 for both series of samples in order to improve the photocatalytic activity. The influence of the preparation method on the physico-chemical properties was established by different characterization methods and the photocatalytic degradation of methylene blue (MB) under UV light irradiation was used as test reaction. The highest photocatalytic activity was observed for the nanocomposites containing 10 wt% of graphene.The elimination of MB can reach 93% and 82% for the nanocomposites with 10 wt% graphene prepared by the sol-gel and hydrothermal methods, respectively. These photocatalysts are promising for practical application in nanotechnology.

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Section: X-ray Diffractionmentioning

confidence: 99%

Enhanced photocatalytic degradation of methylene blue: Preparation of TiO2/reduced graphene oxide nanocomposites by direct sol-gel and hydrothermal methods

Atout

Álvarez

Chebli

et al. 2017

Materials Research Bulletin

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“…4 Other researchers have studied the influence of water content, time, and temperature on hydrothermal crystallization of anatase from hydrous titania. 5,6 Revathi et al investigated the hydrothermal crystallization of unpeptized and peptized titania sols and found that hydrothermal processing of unpeptized titania precipitated from alkoxide showed highly crystallized anatase powder in all cases. However, when the precursor was peptized, i.e., precipitates were redispersed in nitric acid and refluxed to obtain transparent sols, a very small amount of rutile powder was obtained together with anatase powders from ethoxide and isopropoxide whereas the powders from tert-butoxide contained only anatase phase.…”

Section: Introductionmentioning

confidence: 99%

Hydrothermal Preparation of Nanosized Brookite Powders

Zheng

Shi

Cui

et al. 2000

Journal of the American Ceramic Society

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Titania powders in pure brookite form were synthesized by hydrothermal treatment of titanium(IV) salt solutions. Two kinds of starting materials, titanium sulfate and titanium tetrachloride, were used in the hydrothermal reactions. The effects of preparation conditions on the polymorphous form and morphology of the titanium dioxide powders were studied. These conditions included precursor species, precursor pretreatment, pH, and reaction temperature. The conditions that lead to brookite formation versus other phases, such as anatase and rutile, are generalized. The morphologic differences of the three polymorphous powders are shown.

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“…TiO 2 -NP have potential remarkable applications as an attractive filler for multifunctional materials, due to their unique properties such as higher stability, long lasting, safe and broad-spectrum antibiosis (Roessler et al 2002;Cai et al 2006). Common preparation of these types of bionanocomposites included hydrolysis of the metal compounds and dehydration (Montoya et al 1992), sol-gel (Barringer and Bowen 1982), a hydrothermal method (Kondo et al 1994), or modification of commercially available TiO 2 . Common preparation of these types of bionanocomposites included hydrolysis of the metal compounds and dehydration (Montoya et al 1992), sol-gel (Barringer and Bowen 1982), a hydrothermal method (Kondo et al 1994), or modification of commercially available TiO 2 .…”

Section: Nanocomposites: Starch/antioxidants And/ or Antimicrobialsmentioning

confidence: 99%

Biodegradable Starch Nanocomposites

García

Famá

D’Accorso

et al. 2015

Advanced Structured Materials

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Biodegradable thermoplastic materials offer great potential to be used in food packaging or biomedical industry. In this chapter we will present a review of the research done on starch and starch nanocomposites. In the case of nanocomposites based on starch, special attention will be given to the influence of starch nanoparticles, cellulose whiskers, zinc oxide nanorods, antioxidants, and antimicrobial inclusion on the physicochemical properties of the materials. The discussion will be focused on structural, mechanical, and barrel properties as well as on degradation, antibacterial and antioxidant activities. Finally, we will discuss our perspectives on how future research should be oriented to contribute in the substitution of synthetic materials with new econanocomposites.

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Crystallization Behavior and Microstructure of Hydrothermally Treated Monodispersed Titanium Dioxide Particles

Cited by 28 publications

References 0 publications

Enhanced photocatalytic degradation of methylene blue: Preparation of TiO2/reduced graphene oxide nanocomposites by direct sol-gel and hydrothermal methods

Enhanced photocatalytic degradation of methylene blue: Preparation of TiO2/reduced graphene oxide nanocomposites by direct sol-gel and hydrothermal methods

Hydrothermal Preparation of Nanosized Brookite Powders

Biodegradable Starch Nanocomposites

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