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Catalysts 2018, 8(2), 57; https://doi.org/10.3390/catal8020057

Ag3PO4-TiO2-Graphene Oxide Ternary Composites with Efficient Photodegradation, Hydrogen Evolution, and Antibacterial Properties

1
Department of Applied Materials and Optoelectronic Engineering, National Chi Nan University, Nantou County 54561, Taiwan
2
Department of Applied Chemistry, National Chi Nan University, Nantou County 54561, Taiwan
*
Author to whom correspondence should be addressed.
Received: 10 December 2017 / Revised: 14 January 2018 / Accepted: 29 January 2018 / Published: 2 February 2018
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Abstract

Ag3PO4-TiO2-graphene oxide ternary composite photocatalysts were fabricated by the photocatalytic reduction and ion exchange methods. The properties and photocatalytic activity of the composites were examined, and the photodegradation mechanism was investigated. More TiO2 nanoparticles in the composites were found to improve light absorption, but caused a larger impedance and inferior charge transport. Excess TiO2 nanoparticles distributed over the surfaces of Ag3PO4 and graphene oxide decreased the specific surface area and thus lowered light absorbance. An appropriate TiO2 content enhanced photocatalytic performance. When the molar ratio of Ag3PO4 to TiO2 was 0.6, the highest efficiency in photodegradation, hydrogen production (with a quantum efficiency of 8.1% and a hydrogen evolution rate of 218.7 μmole·g−1·h−1) and bacterial inactivation was achieved. Trapping experiments demonstrated that superoxide radicals and holes are the major active species involved in the photodegradation process. View Full-Text
Keywords: graphene oxide; titanium dioxide; silver phosphate; photocatalyst; ternary composite; photodegradation; hydrogen evolution; hydrogen production graphene oxide; titanium dioxide; silver phosphate; photocatalyst; ternary composite; photodegradation; hydrogen evolution; hydrogen production
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Sheu, F.-J.; Cho, C.-P.; Liao, Y.-T.; Yu, C.-T. Ag3PO4-TiO2-Graphene Oxide Ternary Composites with Efficient Photodegradation, Hydrogen Evolution, and Antibacterial Properties. Catalysts 2018, 8, 57.

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