Photocatalytic oxidation of oxalic acid enhanced by silver deposition on a TiO2 surface

Szabó-Bárdos, Erzsébet; Czili, Hajnalka; Horváth, Attila

doi:10.1016/s1010-6030(02)00330-1

Cited by 154 publications

(82 citation statements)

References 36 publications

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“…In heterogeneous photocatalytic methods utilized for the degradation of organic pollutants the most widely used material is titanium dioxide, TiO2 (Szabó-Bárdos et al 2003, Fabbri et al 2006, Patsoura et al 2007. Efficient photocatalytic mineralization of 1,5-naphthalenedisulfonate (Szabó-Bárdos et al 2008b) and benzenesulfonate (Sangchakr et al 1995;Szabó-Bárdos et al 2011) was also realized in titanium dioxide suspension.…”

Section: Introductionmentioning

confidence: 99%

Degradation of industrial surfactants by photocatalysis combined with ozonation

Zsilák

Fónagy

Szabó-Bárdos

et al. 2014

Environ Sci Pollut Res

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The efficiency of titanium dioxide-mediated photocatalytic degradation of pollutants can be enhanced by combination with another advanced oxidation procedure such as ozonation.Mineralization of hydroxy-and dihydroxybenzenesulfonate based on these methods, both individually and combined, was investigated by monitoring the total organic carbon (TOC) content, sulfate concentration, pH, HPLC as well as the absorption spectral changes. The mineralization efficiency of the combined procedure significantly exceeded the sum of those of the individual techniques. The comparison of the disappearance of the starting material and the formation of the sulfate ions indicates that desulfonation is not the primary step of the degradation. Moreover, in the case of the combined method, ring-cleavage, and thus, partial mineralization can occur without desulfonation. Efficient degradation of other, widely used industrial surfactants, such as alkylbenzene sulfonates and alkyl ether sulfates, was also achieved by heterogeneous photocatalysis combined with ozonation, offering an applicable method for the removal of these pollutants.

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Section: Introductionmentioning

confidence: 99%

Degradation of industrial surfactants by photocatalysis combined with ozonation

Zsilák

Fónagy

Szabó-Bárdos

et al. 2014

Environ Sci Pollut Res

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“…Thus, the Ag NPs act as electron traps [42][43][44], which can effectively decrease the rate of electron-hole recombination, and increase the photocatalytic activity. On the other hand, the photocatalytic efficiency can be decreased by oversized Ag particles on titania surfaces, which act as recombination centers [45].…”

Section: Ab + Ohmentioning

confidence: 99%

Photocatalytic performance of graphene/Ag/TiO₂hybrid nanocomposites

Lee¹,

Kim²,

Cho³

et al. 2015

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To improve photocatalytic efficiency, graphene/Ag/TiO 2 nanotube catalyst was synthesized, and its surface characteristics and photocatalytic activity investigated. For deposition of Ag nanoparticles on the TiO 2 nanotubes, a polymer compound containing CH 3 COOAg/poly(Llactide) was utilized, and the silver particles were precipitated by reducing the silver ions during the annealing process. Graphene deposition on the Ag/TiO 2 nanotubes was achieved using an electrophoretic deposition process. Based on the dye degradation results, it was determined that the photocatalytic efficiency was significantly affected by deposition of silver particles and graphene on the TiO 2 catalyst. Highly efficient destruction of the dye was obtained with the new graphene/Ag/TiO 2 nanotube photocatalyst. This may be attributed to a synergistic effect of the graphene and Ag nanoparticles on the TiO 2 nanotubes.

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“…Ag deposition on the surface of the photocatalyst was carried out by photoreduction of AgNO 3 in the presence of oxalic acid in an aqueous suspension as prepared by Szabo-Bardos et al [15,18]. Silver loading was varied from 0.10 to 1.50% on the surface of the photocatalyst by varying the concentration of silver nitrate.…”

Section: Catalyst Preparationmentioning

confidence: 99%

Silver metalized mixed phase manganese-doped titania: Variation of electric field and band bending within the space charge region with respect to the silver content

Nagaraj

Devi

2014

Journal of Molecular Catalysis A: Chemical

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a b s t r a c tSilver was deposited on manganese-doped titanates (Mn-TiO 2 ) by photoinduced deposition method. The catalyst shows enhanced photocatalytic activity due to the synergistic effect of bicrystalline framework of anatase and rutile structures with high intimate contact due to the similarity in their crystallite sizes. The deposited metal nanostructures help in the formation of resonant surface plasmons in response to a photon flux, localizing the electromagnetic energy close to their surfaces. Better charge separation is achieved near the semiconductor surface due to the localized field. Silver deposition was varied from 0.1 to 1.5% on the surface of Mn-TiO 2 . The mechanism of interfacial electron transfer at heterojunctions in mixed phase induced by the plasmonic catalysis is explained. The extent of band bending, the variation of potential field in the space charge region with respect to the size of the deposited Ag metal particles is discussed. The photocatalytic activity of silver deposited Mn-TiO 2 was evaluated by taking resorcinol (Rs) as the model compound along with oxidants such as hydrogen peroxide (H 2 O 2 ) and ammonium per sulfate (APS) under UV/solar light illumination. The electronic level of the dopant, high intimate contact between the anatase and rutile phases along with efficient electron trapping by silver particles, plays a significant role in the photocatalytic process.

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Photocatalytic oxidation of oxalic acid enhanced by silver deposition on a TiO2 surface

Cited by 154 publications

References 36 publications

Degradation of industrial surfactants by photocatalysis combined with ozonation

Degradation of industrial surfactants by photocatalysis combined with ozonation

Photocatalytic performance of graphene/Ag/TiO₂hybrid nanocomposites

Silver metalized mixed phase manganese-doped titania: Variation of electric field and band bending within the space charge region with respect to the silver content

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Photocatalytic oxidation of oxalic acid enhanced by silver deposition on a TiO2 surface

Cited by 154 publications

References 36 publications

Degradation of industrial surfactants by photocatalysis combined with ozonation

Degradation of industrial surfactants by photocatalysis combined with ozonation

Photocatalytic performance of graphene/Ag/TiO2hybrid nanocomposites

Silver metalized mixed phase manganese-doped titania: Variation of electric field and band bending within the space charge region with respect to the silver content

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Photocatalytic performance of graphene/Ag/TiO₂hybrid nanocomposites