Oxidative photoelectrochemical technology with Ti/TiO2 anodes

Palombari, R.; Ranchella, Michele; Rol, Cesare; Sebastiani, Giovanni V.

doi:10.1016/s0927-0248(01)00093-9

Cited by 63 publications

(38 citation statements)

References 28 publications

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“…combination of the heterogeneous photocatalysis (PC) with the electrocatalytic (EC) one, has shown to be an effective tool in order to improve the performance of mineralization reactions [32]. However, very few examples of synthetic reactions carried out by the PEC method are reported in the literature; in most cases the synthetic reactions were carried out in organic solvents [33,34].…”

Section: Introductionmentioning

confidence: 99%

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Photoelectrocatalytic selective oxidation of 4-methoxybenzyl alcohol in water by TiO2 supported on titanium anodes

Özcan

Yurdakal

Augugliaro

et al. 2013

Applied Catalysis B: Environmental

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a b s t r a c tThe photoelectrocatalytic partial oxidation of 4-methoxybenzyl alcohol in aqueous solution irradiated by near-UV light was carried out in a three-electrode batch reactor. TiO 2 films were either deposited by dip-coating of a TiO 2 sol onto a Ti foil and subsequent calcination or generated on Ti plates by thermal oxidation in air at 400-700 • C. The effects of the anode preparation method and bias potential values on conversion and selectivity to the corresponding aldehyde were investigated. The photoelectrocatalytic results were compared with the photocatalytic and electrocatalytic ones. The results indicated that no reaction occurred during the electrocatalytic experiments, whereas the photocatalytic reactivity was positively influenced by the application of a small bias (0.75 V vs. saturated calomel electrode). By applying the previous bias the highest initial degradation rates, r 0 , and selectivities to 4-methoxybenzaldehyde, S, were obtained in photoelectrocatalytic experiments by using Ti plate calcined at 500 • C (r 0 = 0.1507 mM h −1 , S = 85%) or TiO 2 film prepared by dip-coating and calcined at 700 • C (r 0 = 0.1339 mM h −1 , S = 90%). In order to investigate the influence of the substituent groups on reactivity and selectivity, photoelectrocatalytic runs with benzyl alcohol, 2-methoxybenzyl alcohol, 3-methoxybenzyl alcohol, 2,4-dimethoxybenzyl alcohol, 2,3,4-trimethoxybenzyl alcohol, 4-nitrobenzyl alcohol and 4-hydroxybenzyl alcohol have been performed. The selectivity and reactivity values increased by increasing the electron-donor properties of the substituent groups. This positive effect, however, was obtained only if the electron-donor group is in para or ortho position with respect to the alcoholic group.

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Section: Introductionmentioning

confidence: 99%

“…Rutile and anatase TiO 2 films can be grown on Ti plates by thermal oxidation [33,47] in air or oxygen. A very important step in the preparation of the oxide layers, especially when applying short oxidation times, is the pre-treatment consisting in cleaning the Ti support with ethanol and etching it in acid prior to thermal oxidation.…”

Section: Introductionmentioning

confidence: 99%

Photoelectrocatalytic selective oxidation of 4-methoxybenzyl alcohol in water by TiO2 supported on titanium anodes

Özcan

Yurdakal

Augugliaro

et al. 2013

Applied Catalysis B: Environmental

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“…The high current was applied to enhance the adhesion of manganese atoms into the coating layer [18][19][20]. The pH was set at 2.0 because at higher values, the stability of the bath decreased and this could cause precipitation or incorporation of non-adherent manganese hydroxides in the metal coating.…”

Section: Methodsmentioning

confidence: 99%

Effect of an External Applied Potential on the Photocatalytic Properties of Manganese-Doped Titanium Dioxide

Ekoko¹

2014

AJPC

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Abstract:The electrochemical anodic oxidation method was used to prepare thin films of titanium dioxide (TiO 2 ) semiconductors (undoped and doped with Mn). These films were used to test the oxidation of methanol (CH 3 OH), the degree of which was quantified by measuring the current density produced as a function of an applied potential between 0.5 V and 5.0 V. The value of the potential to be applied in order to prevent fast electron-hole recombination was determined. The observed phenomenon is explained by considering the wave nature of the electron.

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“…Since the hole was a powerful oxidizing agent, it could decompose contaminants adsorbed on the TiO 2 surface. Meanwhile, it could also oxidize water to produce hydroxyl radicals that could decompose organic pollutants in water [9]- [12]. There were many reports on photoelectrocatalytic degradation of organic pollutants by using TiO 2 electrodes which were prepared by coating the surfaces of electrically conducting sub-strates (ITO, Ti) with TiO 2 film.…”

Section: Introductionmentioning

confidence: 99%

Visible Light Photoelectrocatalytic Degradation of Rhodamine B Using Ti/TiO2-NiO Photoanode

Wahyuningsih¹,

Purnawan²,

Saraswati³

et al. 2014

JEP

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The method of Ti/TiO 2 -NiO photoelectrode prepared by using sol-gel method continued by calcination process was introduced. The prepared TiO 2 -NiO film was observed with XRD and TEM. The anatase-rutile TiO 2 was mainly on the prepared TiO 2 -NiO composite surface electrode. In addition to NiO, the composite also formed NiTiO 3 that increased with increasing calcination temperature. Photoelectrocatalytic degradation of Rhodamine B (RB) using this electrode was investigated, and anodic potential and pH were optimized. RB degradation was investigated under different conditions, and it showed that photoelectrocatalytic degradation could achieve efficient and complete mineralization of organic pollutant. Through comparison of the photoelectrocatalytic oxidation using the Ti/TiO 2 -NiO electrode operated by single photoanode with the Ti/TiO 2 -NiO electrode operated by several photoanode, it was found that the photoelectrocatalytic efficiency of that by series photoanodes was higher. Additionally, photoelectrocatalytic system was performed at the several different photoelectrodes, which verified the higher photocatalytic activity compared with the single photoelectrode.

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Oxidative photoelectrochemical technology with Ti/TiO2 anodes

Cited by 63 publications

References 28 publications

Photoelectrocatalytic selective oxidation of 4-methoxybenzyl alcohol in water by TiO2 supported on titanium anodes

Photoelectrocatalytic selective oxidation of 4-methoxybenzyl alcohol in water by TiO2 supported on titanium anodes

Effect of an External Applied Potential on the Photocatalytic Properties of Manganese-Doped Titanium Dioxide

Visible Light Photoelectrocatalytic Degradation of Rhodamine B Using Ti/TiO2-NiO Photoanode

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