On the application of nanostructured electrodes prepared by Ti/TiO2/WO3 “template”: A case study of removing toxicity of indigo using visible irradiation

Guaraldo, Thaís Tasso; Zanoni, Thalita B.; Torresi, Susana Inês Córdoba de; Gonçales, Vinícius R.; Zocolo, Guilherme Julião; Oliveira, Danielle Palma de; Zanoni, María Valnice Boldrin

doi:10.1016/j.chemosphere.2012.12.027

Cited by 46 publications

(25 citation statements)

References 36 publications

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“…These compounds could be used in new technology involving the degradation of organic contaminants by using sunlight, making it economically attractive. The use of bicomponent nanostructured TiO 2 /WO 3 electrode prepared by the template method promoted 97 % of decolorization of the indigo carmine dye and 62 % of mineralization under applied potential of 1.0 V under visible light irradiation [105]. The literature reports some works involving photoelectrocatalytic oxidation of organic compounds using bicomposites of TiO 2 /WO 3 [106][107][108][109][110].…”

Section: Doped and Surface-modified Tio 2 Photoanodesmentioning

confidence: 99%

Achievements and Trends in Photoelectrocatalysis: from Environmental to Energy Applications

et al. 2015

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The great versatility of semiconductor materials and the possibility of generation of electrons, holes, hydroxyl radicals, and/or superoxide radicals have increased the applicability of photoelectrocatalysis dramatically in the contemporary world. Photoelectrocatalysis takes advantage of the heterogeneous photocatalytic process by applying a biased potential on a photoelectrode in which the catalyst is supported. This configuration allows more effectiveness of the separation of photogenerated charges due to light irradiation with energy being higher compared to that of the band gap energy of the semiconductor, which thereby leads to an increase in the lifetime of the electron-hole pairs. This work presents a compiled and critical review of photoelectrocatalysis, trends and future prospects of the technique applied in environmental protection studies, hydrogen generation, and water disinfection. Special attention will be focused on the applications of TiO 2 and the production of nanometric morphologies with a great improvement in the photocatalyst properties useful for the degradation of organic pollutants, the reduction of inorganic contaminants, the conversion of CO 2 , microorganism inactivation, and water splitting for hydrogen generation.

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Section: Doped and Surface-modified Tio 2 Photoanodesmentioning

confidence: 99%

Achievements and Trends in Photoelectrocatalysis: from Environmental to Energy Applications

et al. 2015

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“…Note that IC only presents signals i, ii (involving a shoulder) and iii (refer to Fig. 6, t = 0) [36], which are also in common with the first byproduct since there exists a fraction of IC that remains in solution approximately until t = 60 min. At high current densities (Fig.…”

Section: Degradation Of Indigo Carminementioning

confidence: 98%

“…Guaraldo et al, 2013, andDe Urzedo et al, 2007, studied the degradation of IC using a photoelectrocatalytic treatment with Ti/TiO 2 /WO 3 , and hypochlorite in aqueous medium, respectively. The formation of isatin-5-sulfonic acid as the main by-product resulting from the degradation was a common denominator in both investigations [36,37]. In order to confirm the identity of this by-product, an UVvis analysis was carried out with a standard of isatin-5-sulfonic acid (supplementary data 3).…”

Section: Degradation Of Indigo Carminementioning

confidence: 99%

The abatement of indigo carmine using active chlorine electrogenerated on ternary Sb2O5-doped Ti/RuO2-ZrO2 anodes in a filter-press FM01-LC reactor

Palma‐Goyes

Vazquez‐Arenas

Torres-Palma

et al. 2015

Electrochimica Acta

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“…3 The coupling of WO 3 and TiO 2 can be especially useful for the photoelectrocatalytic oxidation of organic species. [4][5][6][7][8][9] There are considerable benefits derived from the coupling of oxide materials containing close band gap energies, such as TiO 2 (3.2 eV) and WO 3 (2.8 eV). The valence and conduction band energy diagrams for WO 3 and TiO 2 bicomponent materials indicate electron injection from the TiO 2 conduction band to WO 3 is favored, while hole transfer between valence bands occurs in the opposite direction.…”

Section: Introductionmentioning

confidence: 99%

“…4 Most studies of TiO 2 /WO 3 photoanodes have concerned coatings prepared by electrodeposition and electrosynthesis, 8,10 while the preparation of templated TiO 2 /WO 3 nanostructured films has received a reduced amount of attention. 7 Considering recent advances in photoelectrocatalysis are directly related to the morphologies of nanostructured semiconductors, the use of templates could offer a simple and versatile approach for the preparation of dimensionally controlled nanostructured TiO 2 /WO 3…”

Section: Introductionmentioning

confidence: 99%

Hydrogen production and simultaneous photoelectrocatalytic pollutant oxidation using a TiO2/WO3 nanostructured photoanode under visible light irradiation

Guaraldo

Gonçales²,

Silva

et al. 2016

Journal of Electroanalytical Chemistry

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Photoelectrochemical (PEC) hydrogen production and simultaneous organic waste degradation is a re-emerging field. The main challenge of this technique has been the synthesis of new photoanode materials that are active towards visible light. Coupling close band gap energy oxides can be used to obtain materials with new optical and electronic properties. For this purpose, Ti/TiO 2 /WO 3 electrodes were prepared by electrochemical anodization followed by templating and cathodic electrodeposition. The nanostructured bicomponent material was used as a photoanode for simultaneous hydrogen generation and organic dye degradation. A good photoactivity response (11 mA cm -2 ) was obtained under UV and visible light irradiation, when compared to pure TiO 2 (8 mA cm -2 ). Optimization of photoelectrochemical conditions revealed that pH optimization had a major impact on H 2 production, resulting in satisfactory hydrogen generation efficiency (46%) and dye removal (100% discoloration and 85% reduction in TOC). A dye oxidation mechanism is proposed, based on LC-MS/MS analyses. The TiO 2 /WO 3 photoanode could potentially be used for environmental remediation and hydrogen generation under solar irradiation.

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On the application of nanostructured electrodes prepared by Ti/TiO2/WO3 “template”: A case study of removing toxicity of indigo using visible irradiation

Cited by 46 publications

References 36 publications

Achievements and Trends in Photoelectrocatalysis: from Environmental to Energy Applications

Achievements and Trends in Photoelectrocatalysis: from Environmental to Energy Applications

The abatement of indigo carmine using active chlorine electrogenerated on ternary Sb2O5-doped Ti/RuO2-ZrO2 anodes in a filter-press FM01-LC reactor

Hydrogen production and simultaneous photoelectrocatalytic pollutant oxidation using a TiO2/WO3 nanostructured photoanode under visible light irradiation

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