Synthesis of nanostructured TiO2/SiO2 as an effective photocatalyst for degradation of acid orange

Çetinkaya, Tuğrul; Neuwirthová, Lucie; Kutláková, Kateřina Mamulová; Tomášek, V.; Akbulut, Hatem

doi:10.1016/j.apsusc.2013.04.121

Cited by 57 publications

(24 citation statements)

References 29 publications

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“…Many synthetic methods were developed to produce rutile TiO 2 such as thermal hydrolysis, microemulsion, solgel, hydro-and solvothermal, thermal annealing, and sonochemical [3,9,14,[18][19][20][21][22][23][24][25][26][27][28][29][30]. They have different drawbacks; some of them are complex, require high energy or special equipment, cause a low yield, or need calcination at high temperature for phase transition.…”

Section: Introductionmentioning

confidence: 99%

Visible light photocatalytic activity of rutile TiO2 fiber clusters in the degradation of terephthalic acid

Yener

Helvacı

2015

Appl. Phys. A

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Rutile TiO 2 nanoparticles, in different structural and morphological properties, were produced by the hydrolysis of titanium tetrachloride in a highly acidic reaction media at moderate temperatures without calcination. Their photocatalytic activities were investigated in the liquid-phase degradation of terephthalic acid under visible light illumination. The parameters, which are the concentration of the titanium tetrachloride solution (0.1-1 M) and reaction temperature (60-95°C), effective on the properties of the particles, and their photocatalytic performances, were investigated. The XRD patterns indicated a pure rutile crystal structure at moderate temperatures without need of calcination. The FEGSEM images showed the formation of flower-, pinecone-, and sphere-like clusters consisting of interconnected nanofibers. The N 2 adsorption-desorption isotherms pointed out the microporous structure of the clusters. Band gap energies were found to be varying between 3.02 and 3.08 eV due to the well-developed rutile crystallite structure. Systematic studies elucidated that the optimum reactant concentration and reaction temperature are 0.5 M TiCl 4 and 95°C, respectively. The rutile clusters synthesized at the optimum reaction conditions exhibited 99 % of the photocatalytic degradation of TPA under visible light illumination at shorter irradiation times compared with commercial P25 TiO 2 .

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Section: Introductionmentioning

confidence: 99%

Visible light photocatalytic activity of rutile TiO2 fiber clusters in the degradation of terephthalic acid

Yener

Helvacı

2015

Appl. Phys. A

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“…Lo anterior se puede lograr a través del dopado con metales de transición u otro elemento dopante, y el uso de semiconductores acoplados (Ikeda et al, 2003;Iliev et al, 2003;Gurunathan, 2004). Ejemplos de sistemas semiconductores acoplados que han sido utilizados para tal fin son CdS/TiO2 (Li et al, 2010), ZnO/TiO2 (Ge et al, 2009), SnO2/TiO2 (Hou et al, 2007), SiO2/TiO2 (Cetinkaya et al, 2013), Fe2O3/TiO2 (Banisharif et al, 2015, Galeano et al, 2013, entre otros, y mostraron adecuados niveles de degradación de varios compuestos orgánicos. El óxido de bismuto (Bi2O3), es un material semiconductor con un ancho de banda directo de 2.8 eV que puede ser excitado por luz visible pero su baja actividad fotocatalítica se debe a la fotocorrosión y a la rápida recombinación del par electrón/hueco fotogenerado en su superficie (Hameed et al, 2009).…”

Section: Introductionunclassified

Degradación Fotocatalítica de Contaminantes Orgánicos Presentes en Agua Residual de la Industria Litográfica mediante Oxido de Bismuto(NI)/Oxido de Titanio (Bi2O3/TiO2)

López–Vásquez

Almanza²,

Acosta³

et al. 2016

Inf. tecnol.

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ResumenSe prepararon semiconductores acoplados de Bi2O3/TiO2 mediante el método de impregnación húmeda. La actividad fotocatalítica se evaluó sobre la degradación de compuestos orgánicos presentes en agua residual generada por la industria litográfica bajo irradiación UV-visible y fueron caracterizados mediante difracción de rayos x, espectroscopia UV visible e infrarroja. Se utilizó la metodología de superficie de respuesta a través de un diseño factorial de tres niveles para evaluar el efecto combinado de la relación Bi2O3/TiO2 y el pH inicial de la solución. Las respuestas evaluadas fueron los porcentajes de remoción de carbono orgánico total y Demanda Química de Oxígeno. Los resultados revelaron que los materiales compuestos (composites) de Bi2O3/TiO2 mostraron un menor tamaño de cristal, mayor estabilidad térmica y una mayor absorción en el rango visible que el TiO2 puro AbstractCoupled semiconductors of Bi2O3/TiO2 were synthetized by wet impregnation. Photocatalytic activity was evaluated upon the removal of organic pollutants presents in lithographic wastewater under UV-vis radiation. Catalyst were characterized by X ray diffraction, diffuse reflectance spectroscopy and Fourier transform infrared spectroscopy. Response surface methodology was employed with two factors in three to evaluate the combined effect of the ratio Bi2O3/TiO2 and the initial pH of the solution. The responses evaluated were the removal percentages of total organic carbon and chemical oxygen demand. The results showed that Bi2O3/TiO2 composites have smaller crystal size, higher thermal stability and a higher absorption in the visible range than pure TiO2.

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“…Then silica sol was filtered using Whatman paper and put into beaker glass. The extraction was kept for 24 h to obtain a homogeneous silica sol or Si(OH) 4 .…”

Section: Preparation Of Silica Sol From Rice Huskmentioning

confidence: 99%

“…Several factors can influence the photocatalytic property of titania-silica such as its crystalline, particle size, surface area, and dislocations on the surface [4,15]. The decreasing in particle size suppresed the recombination of electron photoexcitation, e -and hole, h + [16][17] so that it photocatalytic property will increase.…”

Section: Introductionmentioning

confidence: 99%

“…The main usage of titania is used to decompose the toxin organic compound like dye from the textile industry [2]. The dye liquid pollutant flowing to the river without prior processing can influence the environmental health [3][4]. Generally, dye such as rhodamine-B, naphthol blue black, MB, and congo red [5] can be assumed as a long chain organic compound that makes it difficult to be decomposed with the conventional chemistry reaction.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis and Characterization of Titania-Rice Husk Silica Composites as Photocatalyst

et al. 2015

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Synthesis of nanostructured TiO2/SiO2 as an effective photocatalyst for degradation of acid orange

Cited by 57 publications

References 29 publications

Visible light photocatalytic activity of rutile TiO2 fiber clusters in the degradation of terephthalic acid

Visible light photocatalytic activity of rutile TiO2 fiber clusters in the degradation of terephthalic acid

Degradación Fotocatalítica de Contaminantes Orgánicos Presentes en Agua Residual de la Industria Litográfica mediante Oxido de Bismuto(NI)/Oxido de Titanio (Bi2O3/TiO2)

Synthesis and Characterization of Titania-Rice Husk Silica Composites as Photocatalyst

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