Photocatalytic properties of titania powders prepared by hydrothermal method

Kolen’ko, Yu. V.; Чурагулов, Б. Р.; Kunst, M.; Mazérolles, L.; Colbeau‐Justin, Christophe

doi:10.1016/j.apcatb.2004.06.006

Cited by 195 publications

(102 citation statements)

References 26 publications

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“…The highest surface area values were observed for mild treatment conditions (temperature and time) because, under those conditions, smaller crystallite sizes are found. In general, hydrothermal treatment leads to high surface area values, as has been widely reported in the literature for hydrothermal synthesis (Kolen'ko et al, 2004;Kominami, et al, 1997). The samples synthesized at 150ºC presented an average pore size ranging from 6.3 nm (6h) to 8.3 nm (36h), and the samples synthesized at 200ºC presented an average pore size ranging from 9.6 nm (6h) to 13.6 nm (36h).…”

Section: Resultsmentioning

confidence: 70%

Temperature and reaction time effects on the structural properties of titanium dioxide nanopowders obtained via the hydrothermal method

Jahn

Carreño

Foletto

2011

Braz. J. Chem. Eng.

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-An investigation was carried out on the synthesis of titanium dioxide nanopowders via the hydrothermal method, examining the influence of temperature (150ºC and 200ºC) and reaction time (6 to 36 h). The resulting powders were characterized by X-ray diffraction, infrared absorption spectrophotometry, transmission electron micrographs and surface area. The X-ray diffraction revealed that there was formation of a pure crystalline phase, consisting only of anatase for all conditions of synthesis. Both temperature and reaction time proved to have a slight influence on the crystallite size (from 9 to 17 nm) and a significant influence on the surface area (from 86 to 168 m 2 .g -1 ).

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Section: Resultsmentioning

confidence: 70%

Temperature and reaction time effects on the structural properties of titanium dioxide nanopowders obtained via the hydrothermal method

Jahn

Carreño

Foletto

2011

Braz. J. Chem. Eng.

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“…[34] Powders that are hydrothermally produced vary in their microstructures, morphologies and phase compositions. [35] In this study, we demonstrated fabrication of efficient BiOClÀRGO hybrid photocatalyst in presence of PVP via chemical route. These catalysts exhibited good degradation towards RhB dye due to exposing {001} facets and highly porous structures under wide band gap energy and visible light irradiation.…”

Section: Introductionmentioning

confidence: 99%

Size-controlled BiOCl–RGO composites having enhanced photodegradative properties

Kang

Pawar

Pyo

et al. 2015

Journal of Experimental Nanoscience

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Visible light-active bismuth oxychlorideÀreduced graphene oxide (BiOClÀRGO) composite photocatalysts were synthesised using a hydrothermal method at low temperature, and at a low cost. This approach reduced the recombination of electronÀhole pairs and thereby provided more efficient photocatalysts. The size of BiOCl structure was controlled by polyvinylpyrrolidone (PVP) addition. Furthermore, formation of nanosized BiOCl sheets and BiOClÀRGO composites were confirmed by X-ray diffraction, X-ray photoelectron spectroscopy, fieldemission scanning electron microscopy, transmission electron microscopy, and Raman spectroscopy. Fabricated BiOClÀRGO composite with PVP exhibited better photocatalytic activity than pure BiOCl grown with and without PVP towards degradation of Rhodamine B (RhB). It was found that the composite photocatalyst degrades RhB completely within 310 min as compared with several hours for pure BiOCl. The improved photocatalytic performance of BiOClÀRGO composite was attributed to its high specific surface area (22.074 m 2 g ¡1 and existence of polar surfaces, compared with 9.831 m 2 g ¡1 for pure BiOCl). The analyses indicated that RGO helped to reduce recombination losses and improve electron transport. It also showed that presence of polar surfaces improved photocatalytic activity of BiOCl. Hence, BiOClÀRGO composite is a promising catalyst for the degradation of organic pollutants under visible light and could be used in applications such as water purification devices.

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“…Isso comprovou que o tempo de reação tem influência significativa sobre a área superficial, como já relatado na literatura [52]. Os óxidos não calcinados (entradas 1 e 2) possuíram baixa área superficial, sendo que destes o MoO 3 obtido com 6 h de reação hidrotérmica apresentou área superficial de 9,5 m 2 .g -1 (entrada 2).…”

Section: Methodsunclassified

Síntese, caracterização e aplicação do trióxido de molibdênio na fotocatálise de efluente têxtil sintético

Silva

Matos

2018

Cerâmica

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ResumoNeste estudo o trióxido de molibdênio (MoO 3 ) foi sintetizado pelo método hidrotérmico com temperatura fixa em 180 ºC nos tempos de 1 e 6 h, seguido de tratamento térmico por 6 e 12 h a 300, 450 e 600 ºC. A fase cristalina e as propriedades estruturais da amostra foram caracterizadas pelo método de difração de raios X. O comportamento vibracional das ligações químicas foi verificado por espectroscopias na região do infravermelho e Raman, em que as bandas e picos observados confirmaram a formação do MoO 3 . A microscopia eletrônica de varredura mostrou a formação de microestruturas da fase hexagonal (h-MoO 3 ) e ortorrômbica (α-MoO 3 ) do MoO 3 . Além disso, as propriedades de absorção óptica foram medidas por espectroscopia de reflectância difusa e os valores de energia de gap foram estimados no intervalo de 2,74 a 3,33 eV a partir da função Kubelka-Munk. Os óxidos calcinados a 600 ºC foram os que apresentaram a melhor atividade fotocatalítica, degradando 50% do corante em 2 h de reação. Palavras-chaves: efluente sintético, fotocatálise, trióxido de molibdênio. Abstract In this study, the molybdenum trioxide (MoO

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Photocatalytic properties of titania powders prepared by hydrothermal method

Cited by 195 publications

References 26 publications

Temperature and reaction time effects on the structural properties of titanium dioxide nanopowders obtained via the hydrothermal method

Temperature and reaction time effects on the structural properties of titanium dioxide nanopowders obtained via the hydrothermal method

Size-controlled BiOCl–RGO composites having enhanced photodegradative properties

Síntese, caracterização e aplicação do trióxido de molibdênio na fotocatálise de efluente têxtil sintético

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