Photocatalytic behaviour of sulphated TiO2 for phenol degradation

Colón, G.; Hidalgo, M.C.; Navı́o, J.A.

doi:10.1016/s0926-3373(03)00125-5

Cited by 123 publications

(71 citation statements)

References 23 publications

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“…2.1 Photocatalyst Characterization 2.1.1 X-Ray Diffraction Figure 1 shows the XRD patterns of the Pd-TiO 2 photocatalysts; the only crystalline phase present in all the samples was anatase, identified by the main XRD peak located at 25.25°, thus indicating that the sulfation pre-treatment inhibited the formation of the rutile phase of TiO 2 during the calcination process, as has been reported by different authors [33][34][35][36].…”

Section: Resultsmentioning

confidence: 57%

“…The TiO 2 powder was recovered by filtration, dried at 110°C for 24 h and pre-treated by immersion in a 1M sulfuric acid solution under continuous stirring for 1 h. After pre-treatment, the solution was filtered, dried and calcinated at 650°C for 2 h; the resulting photocatalyst was used as starting material (S-TiO 2 ). The fresh TiO 2 powder was submitted to a sulfate treatment, taking into account that previous results have shown that sulfate pre-treatment stabilizes the anatase phase up to high temperatures and protects the surface area against sintering [33][34][35][36].…”

Section: Synthesis Of Photocatalystsmentioning

confidence: 99%

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Simultaneous Production of CH₄and H₂from Photocatalytic Reforming of Glucose Aqueous Solution on Sulfated Pd-TiO₂Catalysts

Vaiano

Iervolino

Sarno

et al. 2015

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

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-In this work, the simultaneous production of CH 4 and H 2 from photocatalytic reforming of glucose aqueous solution on Pd-TiO 2 catalysts under UV light irradiation by Light-Emitting Diodes (LED) was investigated. The Pd-TiO 2 catalysts were prepared by the photodeposition method. The Pd content was in the range 0.5-2 wt% and a photodeposition time in the range 15-120 min was used. Pd-TiO 2 powders were extensively characterized by X-Ray Diffraction (XRD), S BET , X-Ray Fluorescence spectrometry (XRF), UV-Vis Diffuse Reflectance Spectra (UV-Vis DRS), TEM and X-Ray Photoelectron Spectroscopy (XPS). It was found that the lower Pd loading (0.5 wt%) and 120 min of photodeposition time allowed us to obtain homogeneously distributed metal nanoparticles of small size; it was also observed that the increase in the metal loading and deposition time led to increasing the Pd 0 species effectively deposited on the sulfated TiO 2 surface. Particle size and the oxidation state of the palladium were the main factors influencing the photocatalytic activity and selectivity. The presence of palladium on the sulfated titania surface enhanced the H 2 and CH 4 production. In fact, on the catalyst with 0.5 wt% Pd loading and 120 min of photodeposition time, H 2 production of about 26 lmol was obtained after 3 h of irradiation time, higher than that obtained with titania without Pd (about 8.5 lmol). The same result was obtained for the methane production. The initial pH of the solution strongly affected the selectivity of the system. In more acidic conditions, the production of H 2 was enhanced, while the CH 4 formation was higher under alkaline conditions.Résumé -Production simultanée de CH 4 et H 2 par réformage photocatalytique d'une solution aqueuse de glucose sur un catalyseur Pd-TiO 2 sulfaté -Dans cette recherche, la production simultanée de CH 4 et H 2 par le reformage photocatalytique de glucose sur les catalyseurs Pd-TiO 2 sous irradiation de lumière UV réalisée par des diodes électroluminescentes (LED) a été étudiée. Les échantillons de Pd-TiO 2 ont été préparés par la méthode de photodéposition. Le contenu de Pd était compris entre 0,5-2 % en poids et il a été utilisé un temps de photodéposition dans la gamme 15-20 minutes. Les poudres Pd-TiO 2 ont été caractérisées par diffraction des rayons X (XRD), surface spécifique BET (S BET ), fluorescence X (XRF), spectrométrie UV visible (UV vis DRS), microscopieThis is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.Oil & Gas Science and Technology -Rev. IFP Energies nouvelles, Vol. 70 (2015), No. 5, pp. 891-902 Ó V. Vaiano et al., published by IFP Energies nouvelles, 2015 DOI: 10.2516 électronique à transmission (TEM) et spectrométrie photo électronique X (XPS). Il a été constaté que le chargement inférieur de Pd (0,5 % en poids) et 120 minutes de temps d...

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Section: Resultsmentioning

confidence: 57%

Section: Synthesis Of Photocatalystsmentioning

confidence: 99%

Simultaneous Production of CH₄and H₂from Photocatalytic Reforming of Glucose Aqueous Solution on Sulfated Pd-TiO₂Catalysts

Vaiano

Iervolino

Sarno

et al. 2015

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

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“…It has been reported that doping titanium oxide with metal oxides such as WO 3 improves the acidic properties of the material and increases its photocatalytic activity (Cui et al, 1995). Other studies also support the idea that one of the ways to improve the photocatalytic performance is by increasing the number and strength of acid sites in the catalysts (Colón et al, 2003;Kozlov et al, 2003).…”

Section: Introductionmentioning

confidence: 89%

Synthesis and physicochemical characterization of titanium oxide and sulfated titanium oxide obtained by thermal hydrolysis of titanium tetrachloride

Benito

Sánchez

García-Alamilla

et al. 2014

Braz. J. Chem. Eng.

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-This work reports the synthesis of titanium oxide (TiO 2 ) and sulfated titanium oxide (TiO 2 -SO 4 2-) obtained by thermal hydrolysis of titanium tetrachloride. Titanium hydroxide synthesized by this method was impregnated with a 1 N H 2 SO 4 solution, to give amounts of sulfate ions (SO 4 2-) of 3 and 7 wt%. The synthesized samples were dried at 120 °C during 24 h and then calcined for 3 h at 400 °C. Thermal analyses, X-ray diffraction, nitrogen physisorption, infrared spectroscopy, potentiometric titration with n-butylamine, U.V.-visible diffuse reflectance spectroscopy and scanning electron microscopy were used to characterize the materials. The results of physicochemical characterization revealed that a mixture of crystalline structures, anatase, brookite and rutile developed in the titanium oxide, stabilizing the anatase structure in the sulfated titanium oxides, and coexisting with a small amount of brookite structure. The synthesized mesoporous materials developed specific surface areas between 62 and 70 m 2 g -1, without detecting an important influence of sulfation on this parameter. The presence of sulfate ions improved the acidity of titanium oxide and modified the characteristics of light absorption in the 425-600 nm region, which suggests the possibility of using these materials in reactions assisted by visible light.

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“…In photoelectrocatalytic (PEC) method, positive potential was applied on the working electrode, which could inhibit the recombination of electrons and holes and enhance the rate of PEC degradation of organic compounds. [24][25][26] The purpose of this study is to propose synergetic effects of photolysis and electrolysis with CNT/TiO 2 composites electrode system by an electrochemical method. The electrical driving force may play role in the sorption and decomposition of azo compounds.…”

Section: 23)mentioning

confidence: 99%

Synthesis and Characterization of CNT / TiO₂Photoelectrocatalytic Electrodes for Methlene Blue Degradation

Zhang¹,

Chen²,

Oh³

2008

Korean. J. Mater. Res.

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In this study, two series of CNT/TiO 2 electrodes were prepared. The decrease of surface area compared with that of the pristine carbon nanotubes (CNTs) indicated the blocking of micropores on the surface of the CNTs; was further supported by scanning electron microscopy (SEM) and field emission SEM (FE-SEM) observations. The X-ray diffraction (XRD) results showed that the CNT/TiO particles. The energy dispersive X-ray spectroscopy (EDX) spectra showed the presence of C, O and Ti peaks for all samples. It was found that catalytic decomposition of methylene blue (MB) solution could be attributed to synthetic effects between the TiO 2 photocatalysis and electro-assisted CNTs network, and that photoelectrocatalytic oxidation increased with an increase of CNT composition. It was also found that the photoelectrocatalytic oxidation efficiency for MB is higher than that of photocatalytic oxidation. Moreover, the CNT/TiO 2 composites catalyst prepared by the impregnation method demonstrates higher photoelectrocatalytic activity than the mechanical mixture with the same CNT content.

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Photocatalytic behaviour of sulphated TiO2 for phenol degradation

Cited by 123 publications

References 23 publications

Simultaneous Production of CH₄and H₂from Photocatalytic Reforming of Glucose Aqueous Solution on Sulfated Pd-TiO₂Catalysts

Simultaneous Production of CH₄and H₂from Photocatalytic Reforming of Glucose Aqueous Solution on Sulfated Pd-TiO₂Catalysts

Synthesis and physicochemical characterization of titanium oxide and sulfated titanium oxide obtained by thermal hydrolysis of titanium tetrachloride

Synthesis and Characterization of CNT / TiO₂Photoelectrocatalytic Electrodes for Methlene Blue Degradation

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Photocatalytic behaviour of sulphated TiO2 for phenol degradation

Cited by 123 publications

References 23 publications

Simultaneous Production of CH4and H2from Photocatalytic Reforming of Glucose Aqueous Solution on Sulfated Pd-TiO2Catalysts

Simultaneous Production of CH4and H2from Photocatalytic Reforming of Glucose Aqueous Solution on Sulfated Pd-TiO2Catalysts

Synthesis and physicochemical characterization of titanium oxide and sulfated titanium oxide obtained by thermal hydrolysis of titanium tetrachloride

Synthesis and Characterization of CNT / TiO₂Photoelectrocatalytic Electrodes for Methlene Blue Degradation

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Simultaneous Production of CH₄and H₂from Photocatalytic Reforming of Glucose Aqueous Solution on Sulfated Pd-TiO₂Catalysts

Simultaneous Production of CH₄and H₂from Photocatalytic Reforming of Glucose Aqueous Solution on Sulfated Pd-TiO₂Catalysts