Photocatalytic decomposition of l-serine and l-aspartic acid over bare and silver-deposited TiO2

Szabó-Bárdos, Erzsébet; Baja, Bernadett; Horváth, Erzsébet; Horváth, Attila

doi:10.1016/j.jphotochem.2010.04.017

Cited by 10 publications

(8 citation statements)

References 30 publications

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“…Interestingly, although the new C–H stretching bands correspond well to those observed for free, i.e., nonadsorbed, pivalic acid ((ii) red line, Figure ), the signal at 1692 cm –1 , characteristic of the key −COOH group ((ii) red line, Figure ), only appears in low intensity, clearly demonstrating that only a negligible percentage of pivalic acid adsorbs onto the catalyst surface in its free acidic form. However, new vibrations in the region 1600–1100 cm –1 are observed, consistent with those reported for deprotonated pivalic acid, (CH 3 ) 3 CCOO – …”

Section: Results and Discussionsupporting

confidence: 88%

“…Further evidence of this mechanism was obtained through the observation of CO 2 in the effluent of a TPD-MS experiment, following photoirradiation of DMGA-treated TiO 2 (Figures S5–9). Accordingly, DRIFTS and TPD-MS studies indicate that the carboxylic acid groups of the substrate bind to the TiO 2 surface in their carboxylate form and only decompose from the surface under photoirradiation, accompanied by the loss of CO 2 . , …”

Section: Results and Discussionmentioning

confidence: 99%

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Catalytic Formation of C(sp³)–F Bonds via Heterogeneous Photocatalysis

Tarantino

Hammond

2018

ACS Catal.

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Due to their chemical, physical, and biological properties, fluorinated compounds are widely employed throughout society. Yet, despite their critical importance, current methods of introducing fluorine into compounds suffer from severe drawbacks. For example, several methods are noncatalytic and employ stoichiometric equivalents of heavy metals. Existing catalytic methods, on the other hand, exhibit poor activity, generality, selectivity and/or have not been achieved by heterogeneous catalysis, despite the many advantages such an approach would provide. Here, we demonstrate how selective C(sp 3 )−F bond synthesis can be achieved via heterogeneous photocatalysis. Employing TiO 2 as photocatalyst and Selectfluor as mild fluorine donor, effective decarboxylative fluorination of a variety of carboxylic acids can be achieved in very short reaction times. In addition to displaying the highest turnover frequencies of any reported fluorination catalyst to date (up to 1050 h −1 ), TiO 2 also demonstrates excellent levels of durability, and the system is catalytic in the number of photons required; i.e., a photon efficiency greater than 1 is observed. These factors, coupled with the generality and mild nature of the reaction system, represent a breakthrough toward the sustainable synthesis of fluorinated compounds.

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Section: Results and Discussionsupporting

confidence: 88%

Section: Results and Discussionmentioning

confidence: 99%

Catalytic Formation of C(sp³)–F Bonds via Heterogeneous Photocatalysis

Tarantino

Hammond

2018

ACS Catal.

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“…As well as allowing visible light to drive the process, this mechanism has the advantage of avoiding the formation of highly oxidising holes in the valence band. Adsorbed amino acids are oxidatively damaged by valence band holes, [80][81][82] and it is therefore likely that proteins will not survive long periods of bandgap irradiation on semiconductors having a very positive valence-band potential, like TiO 2 . The dye-sensitised system has a turnover frequency of 50 mol H 2 (mol hydrogenase) À1 s À1 , under mild conditions (25 C, pH 7.0).…”

Section: Bio-hybrid Particulate Systemsmentioning

confidence: 99%

Enzymes and bio-inspired electrocatalysts in solar fuel devices

Woolerton

Sheard

Chaudhary

et al. 2012

Energy Environ. Sci.

130

103

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The development of robust systems for the conversion of solar energy into chemical fuels is an important subject in renewable energy research. Key aspects are efficient and rapid catalysis of both fuel production (reduction of H 2 O or CO 2 ), and water oxidation. Enzymes often have extraordinary and unique capabilities as electrocatalysts, and in this Perspective we consider the role that these molecules can play through their incorporation into model systems for solar fuel production, or as inspiration for synthetic catalysts.

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“…Our current investigations indicated TiO 2 -mediated photocatalysis to be successfully applicable to the mineralization of various ionic detergents [ 26 , 27 , 28 ] and amino acids [ 29 ]; besides, its combination with ozonation resulted in a synergistic effect [ 30 , 31 ]. On the basis of the earlier, partly inconsistent observations, our present paper deals with the oxidation and mineralization of Triton X-100 under various circumstances, focusing on the heterogeneous photocatalysis, in order to get more insight into the degradation mechanism.…”

Section: Introductionmentioning

confidence: 99%

TiO2-Mediated Photocatalytic Mineralization of a Non-Ionic Detergent: Comparison and Combination with Other Advanced Oxidation Procedures

et al. 2015

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Triton X-100 is one of the most widely-applied man-made non-ionic surfactants. This detergent can hardly be degraded by biological treatment. Hence, a more efficient degradation method is indispensable for the total mineralization of this pollutant. Application of heterogeneous photocatalysis based on a TiO2 suspension is a possible solution. Its efficiency may be improved by the addition of various reagents. We have thoroughly examined the photocatalytic degradation of Triton X-100 under various circumstances. For comparison, the efficiencies of ozonation and treatment with peroxydisulfate were also determined under the same conditions. Besides, the combination of these advanced oxidation procedures (AOPs) were also studied. The mineralization of this surfactant was monitored by following the TOC and pH values, as well as the absorption and emission spectra of the reaction mixture. An ultra-high-performance liquid chromatography (UHPLC) method was developed and optimized for monitoring the degradation of Triton X-100. Intermediates were also detected by GC-MS analysis and followed during the photocatalysis, contributing to the elucidation of the degradation mechanism. This non-ionic surfactant could be efficiently degraded by TiO2-mediated heterogeneous photocatalysis. However, surprisingly, its combination with the AOPs applied in this study did not enhance the rate of the mineralization. Moreover, the presence of persulfate hindered the photocatalytic degradation.

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Photocatalytic decomposition of l-serine and l-aspartic acid over bare and silver-deposited TiO2

Cited by 10 publications

References 30 publications

Catalytic Formation of C(sp³)–F Bonds via Heterogeneous Photocatalysis

Catalytic Formation of C(sp³)–F Bonds via Heterogeneous Photocatalysis

Enzymes and bio-inspired electrocatalysts in solar fuel devices

TiO2-Mediated Photocatalytic Mineralization of a Non-Ionic Detergent: Comparison and Combination with Other Advanced Oxidation Procedures

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Photocatalytic decomposition of l-serine and l-aspartic acid over bare and silver-deposited TiO2

Cited by 10 publications

References 30 publications

Catalytic Formation of C(sp3)–F Bonds via Heterogeneous Photocatalysis

Catalytic Formation of C(sp3)–F Bonds via Heterogeneous Photocatalysis

Enzymes and bio-inspired electrocatalysts in solar fuel devices

TiO2-Mediated Photocatalytic Mineralization of a Non-Ionic Detergent: Comparison and Combination with Other Advanced Oxidation Procedures

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Catalytic Formation of C(sp³)–F Bonds via Heterogeneous Photocatalysis

Catalytic Formation of C(sp³)–F Bonds via Heterogeneous Photocatalysis