Journal ArticleDOI
Borate-Mediated Hole Transfer from Irradiated Anatase TiO2 to Phenol in Aqueous Solution
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TLDR
In this paper, the authors reported that the addition of sodium borate to an aqueous suspension of anatase TiO2 at neutral pH can result in a significant enhancement in the rate of phenol degradation.Abstract:
The development of a highly active TiO2 photocatalyst for energy and environmental use is a great challenge. In this work, we report that the addition of sodium borate to an aqueous suspension of anatase TiO2 at neutral pH can result in a significant enhancement in the rate of phenol degradation. Similar results were also observed from 2,4-dichlorophenol degradation, spin-trapped OH radical formation, H2O2 decomposition, and chromate reduction in the presence of phenol. This borate-induced rate increase for phenol degradation was determined not only by the amount of borate adsorption but also by the structure of borate species (pH effect). A (photo)electrochemical measurement with the TiO2 film revealed that upon addition of borate, the hole consumption by phenol and the electron consumption by O2 were accelerated and decelerated, respectively. Moreover, the flat band potential of TiO2 was negatively shifted by 81 mV. Since the hole oxidation of water to O2 remained unchanged, it is proposed that a borate...read more
Citations
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Journal ArticleDOI
Effects of Anions and pH on the Stability of ZnO Nanorods for Photoelectrochemical Water Splitting
TL;DR: This work demonstrates the improved stability of zinc oxide nanorods (ZnO NRs) for the photoanode of solar water splitting under voltage biases by the addition of borate or carbonate ions in the aqueous electrolyte with suitable pH ranges and proposes a possible mechanism for the protective behavior of ZnO in borate and carbonate solutions.
Journal ArticleDOI
Sulfur vacancy induced high performance for photocatalytic H2 production over 1T@2H phase MoS2 nanolayers
TL;DR: In this article, the ratio of 1T to 2H and the relative concentration of sulfur vacancies could be adjusted by changing the Mo-precursor (Na2MoO4 and (NH4)2MoS4) and hydrothermal temperature.
Journal ArticleDOI
Sustained production of H2O2 in alkaline water solution using borate and phosphate-modified Au/TiO2 photocatalysts
TL;DR: UV irradiation of Au/TiO2 photocatalysts in the presence of borate and phosphate anions can produce H2O2 at a millimolar level in alkaline water solution thanks to the anion-mediated hole transfer from Au/ TiO2 to an electron donor which accelerates the two-electron reduction of O2 to H2 O2.
Journal ArticleDOI
Synergetic Effect of Pt and Borate on the TiO2-Photocatalyzed Degradation of Phenol in Water
Xianqiang Xiong,Yiming Xu +1 more
TL;DR: In this paper, a synergism between Pt and borate greatly improved the photocatalytic activity of anatase TiO2, and a maximum rate of phenol degradation was observed at 0.52 wt % Pt, 3.0 mM Na2B4O7 and initial pH 9.0.
Journal ArticleDOI
Incorporative Effect of Pt and Na2CO3 on TiO2-Photocatalyzed Degradation of Phenol in Water
TL;DR: In this paper, a positive effect of Na2CO3 on the degradation of phenol, 2,4-dichlorophenol, and H2O2 in an aerated aqueous suspension at initial pH 80 was reported.
References
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Journal ArticleDOI
Role of Water Oxidation Catalyst IrO2 in Shuttling Photogenerated Holes Across TiO2 Interface
TL;DR: In this article, the authors provided a mechanistic and kinetic insight into the catalytic role of IrO2 in the photogenerated hole transfer process in a colloidal TiO2 suspension in ethanol containing 5% acetic acid.
Journal ArticleDOI
Electrochemical Method for Studying the Kinetics of Electron Recombination and Transfer Reactions in Heterogeneous Photocatalysis: The Effect of Fluorination on TiO2 Nanoporous Layers
TL;DR: In this paper, an electrochemical method for evaluating the rate constants of recombination and transfer to solution for electrons generated upon illumination of TiO2 photocatalysts is presented, based on the combination of voltammetric measurements in the dark and open circuit photopotential relaxation measurements done with nanoporous thin film electrodes.
Journal ArticleDOI
H2O2 evolution during the photocatalytic degradation of organic molecules on fluorinated TiO2
Marta Mrowetz,Elena Selli +1 more
TL;DR: In this paper, the effect of surface fluorination on the hydrogen peroxide evolution occurring in photocatalytic runs was investigated employing the azo dye Acid Red 1 (AR1) and two model organic molecules with acidic properties, i.e. formic acid (FA) and benzoic acid(BA), as substrates of oxidative degradation.
Journal ArticleDOI
Enhanced photocatalytic activity of nc-TiO2 by promoting photogenerated electrons captured by the adsorbed oxygen
Yue Cao,Liqiang Jing,Liqiang Jing,Xin Shi,Yunbo Luan,James R. Durrant,Junwang Tang,Honggang Fu +7 more
TL;DR: It is suggested for the first time that the phosphate modification favors the O2 adsorbed on TiO2 so as to further promote the photogenerated electrons captured.
Journal ArticleDOI
Application of a "black body" like reactor for measurements of quantum yields of photochemical reactions in heterogeneous systems.
TL;DR: An experimental application of the concept of a "black body" like reactor to measure quantum yields (Phi) of photochemical reactions in liquid-solid heterogeneous systems and the quantum yield of phenol photodegradation over N-doped TiO(2) is reported.
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