Abstract
A composited system was fabricated by coupling Pt/TiO2 with water-splitting catalyst for photooxidation of organic pollutants in aqueous solutions. The new composited system exhibits more efficient photocatalytic activity than pure Pt/TiO2 does under UV light irradiation. The promoting effect is dependent on the photo-produced H2 over the composited system. The active oxygen species, hydroxyl radical (·OH) and hydrogen peroxide (H2O2), are measured by fluorescence spectroscopy and photometric method, respectively. The results reveal that the produced H2 by photocatalytic water splitting over NiO/NaTaO3:La transfers to Pt particle of TiO2 surface, then reacts with introducing O2 to generate in situ intermediate H2O2, and finally translates into ·OH radical to accelerate the photooxidation of organic pollutants.
Highlights
Photoinduced charge transfer occurring on semiconductor materials can achieve direct conversion of photo energy to chemical energy, and it can be used for elimination of organic pollutants and splitting water into hydrogen
The data show that the high photocatalytic efficiency of the composited system is attributed to the formation of more ·OH which is dependent on the generation of in situ H2O2 from the combination between the photo-produced H2 by the NiO/NaTaO3:La and bubbled O2 on Pt/TiO2 surface
The results show that NiO/NaTaO3:La is photocatalytically inactive for salicylic acid (SA) degradation despite it was reported to be highly active for photocatalytic splitting water into H2 even without sacrificial agent
Summary
Photoinduced charge transfer occurring on semiconductor materials can achieve direct conversion of photo energy to chemical energy, and it can be used for elimination of organic pollutants and splitting water into hydrogen. One approach involves addition of surface adsorbed redox species capable of scavenging selectively either of the excited states to the photoreaction system [2, 3]. Another promising approach concerns modification of TiO2 with noble metals, other semiconductors, and coloring matters to improve the separation of the excited states [4,5,6]. An alternative system was fabricated by coupling Pt/TiO2 with water-splitting catalyst NiO/NaTaO3:La to supply the in situ H2 to enhance photocatalytic oxidation organic pollutants in an aqueous solution, where the obtained composited system is quite different from the classic coupled semiconductor system. The data show that the high photocatalytic efficiency of the composited system is attributed to the formation of more ·OH which is dependent on the generation of in situ H2O2 from the combination between the photo-produced H2 by the NiO/NaTaO3:La and bubbled O2 on Pt/TiO2 surface
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