Surface Complexation at the TiO2(anatase)/Aqueous Solution Interface: Chemisorption of Catechol

Rodríguez, Rosalía; Blesa, Miguel A.; Regazzoni, Alberto E.

doi:10.1006/jcis.1996.0012

Cited by 298 publications

(313 citation statements)

References 7 publications

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“…As already reported by several workers [15][16][17][18][19], white TiO 2 particles and colloids turn yellow upon immersion in a solution containing phenols such as salicylic acid and catechol. The development of the yellow color is a clear indication of the formation of surface TiO 2 -salicylate and TiO 2 -catecholate complexes, and the absorption bands in the visible range were assigned to intramolecular ligand-to-metal charge transfer transition [18,19].…”

Section: Structure Of Tio 2 Modified With Bn(oh)supporting

confidence: 64%

“…On the other hand, in order to clarify the reaction mechanism of the photocatalytic reaction of organic molecules, structural characteristics of these compounds adsorbed on TiO 2 surface have been extensively investigated using various spectroscopic techniques [13][14][15][16][17][18][19]. In the course of these studies, it was proved that colorless aromatic compounds having phenolic hydroxyls such as catechol and salicylic acid react with TiO 2 particles to form colored surface complexes [15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

“…In the course of these studies, it was proved that colorless aromatic compounds having phenolic hydroxyls such as catechol and salicylic acid react with TiO 2 particles to form colored surface complexes [15][16][17][18][19]. Thus, it is expected that a novel visible-light-induced photocatalytic system can be developed by using the photoabsorption of surface complexes on TiO 2 particles.…”

Section: Introductionmentioning

confidence: 99%

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Photochemical hydrogen evolution from aqueous triethanolamine solutions sensitized by binaphthol-modified titanium(IV) oxide under visible-light irradiation

Ikeda

Abe

Torimoto

et al. 2003

Journal of Photochemistry and Photobiology A: Chemistry

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Surface modification of titanium(IV) oxide (TiO 2 ) powders with 1,1'-binaphthalene-2,2'-diol (bn(OH) 2 ), having two phenolic hydroxyls and atropisomeric chirality, in refluxed ethanol led to the formation of a deep yellow-colored surface complex, giving visible-light absorption at a wavelength below ca. 550-600 nm.Quantitative analyses of the surface complex revealed that absorption intensity at 450 nm in diffuse reflection measurement was almost proportional to its amount and that its amount depended strongly on the amount of surface hydroxyl groups of TiO 2 but not on the crystal structure of TiO 2 , anatase and rutile. The bn(OH) 2 complexation was also applied to platinized TiO 2 to drive photocatalytic molecular hydrogen (H 2 ) evolution from 1 deaerated triethanolamine solutions under visible-light irradiation at a wavelength even longer than 540 nm. The photonic efficiency of the photocatalytic reaction at 450 nm was estimated to be 0.02% for bn(OH) 2 -modified TiO 2 (JRC-TIO-3) loaded with 0.1 wt% of platinum. On the basis of these experimental results, the reaction mechanism, which involves visible-light excitation of the surface complex, injection of electrons from the complex to TiO 2 , and migration of the electrons to platinum deposits, where reduction of H + takes place to give H 2 , was elucidated.

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Section: Structure Of Tio 2 Modified With Bn(oh)supporting

confidence: 64%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Photochemical hydrogen evolution from aqueous triethanolamine solutions sensitized by binaphthol-modified titanium(IV) oxide under visible-light irradiation

Ikeda

Abe

Torimoto

et al. 2003

Journal of Photochemistry and Photobiology A: Chemistry

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“…A lower coordination of the oxygens at the surface will result in negative charge on these oxygens, which can be compensated by the adsorption of one or two additional protons per oxygen (Hiemstra et al, 1989a(Hiemstra et al, , 1996b. This leads to the definition of two proton adsorption reactions that can describe the surface charging behavior (Hiemstra et al, 1989b;Rodriguez et al, 1996;Machesky et al, 1998;Regazzoni et al, 1998;Bourikas et al, 2001;Ridley et al, 2004;Fitts et al, 2005;Jing et al, 2005):…”

Section: Resultsmentioning

confidence: 99%

Adsorption and surface oxidation of Fe(II) on metal (hydr)oxides

Hiemstra

Riemsdijk

2007

Geochimica et Cosmochimica Acta

143

109

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“…11 In addition, single molecule measurements of the DOPA/TiO 2 interaction indicate that a stronger interaction is observed at low pH than at high pH. 18 A further complicating factor for high pH values is that DOPA oxidation to the quinone form occurs more readily under these conditions, producing forms that are no longer adhesive.…”

Section: Adhesion Testsmentioning

confidence: 99%

Self-Assembly and Adhesion of DOPA-Modified Methacrylic Triblock Hydrogels

2007

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Marine mussels anchor to a variety of surfaces by secreting liquid proteins that harden and form water-resistant bonds to a variety of surfaces. Studies have revealed that these mussel adhesive proteins contain an unusual amino acid, 3,4-dihydroxy-L-phenylalanine (DOPA), which is believed to be responsible for the cohesive and adhesive properties of these proteins. To separate the cohesive and adhesive roles of DOPA, we incorporated DOPA into the midblock of poly(methyl methacrylate)-poly(methacrylic acid)-poly(methyl methacrylate) (PMMA-PMAA-PMMA) triblock copolymers. Self-assembled hydrogels were obtained by exposing triblock copolymer solutions in dimethyl sulfoxide to water vapor. As water diffused into the solution, the hydrophobic end blocks formed aggregates that were bridged by the water-soluble midblocks. Strong hydrogels were formed with polymer weight fractions between 0.01 and 0.4 and with shear moduli between 1 and 5 kPa. The adhesive properties of the hydrogels on TiO 2 surfaces were investigated by indentation with a flat-ended cylindrical punch. At pH values of 6 and 7.4, the fully protonated DOPA groups were highly adhesive to the TiO 2 surfaces, giving values of ≈2 J/ m 2 for the interfacial fracture energy, which we believe corresponds to the cohesive fracture energy of the hydrogel. At these pH values, the DOPA groups are hydrophobic and have a tendency to aggregate, so contact times of 10 or 20 min are required for these high values of the interfacial strength to be observed. At a pH of 10, the DOPA groups were hydrophilic and highly swellable, but less adhesive gels were formed. Oxidation of DOPA groups, a process that is greatly accelerated at a pH of 10, decreased the adhesive performance of the hydrogels even further.

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Surface Complexation at the TiO2(anatase)/Aqueous Solution Interface: Chemisorption of Catechol

Cited by 298 publications

References 7 publications

Photochemical hydrogen evolution from aqueous triethanolamine solutions sensitized by binaphthol-modified titanium(IV) oxide under visible-light irradiation

Photochemical hydrogen evolution from aqueous triethanolamine solutions sensitized by binaphthol-modified titanium(IV) oxide under visible-light irradiation

Adsorption and surface oxidation of Fe(II) on metal (hydr)oxides

Self-Assembly and Adhesion of DOPA-Modified Methacrylic Triblock Hydrogels

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