Single step solution combustion synthesis of hexagonal WO3 powders as visible light photocatalysts

S. Samet Kaplan; M. Seref Sonmez

doi:10.1016/j.matchemphys.2019.122152

Single step solution combustion synthesis of hexagonal WO₃ powders as visible light photocatalysts

S. Samet Kaplan, M. Seref Sonmez^*

^*Corresponding author for this work

Department of Metallurgical and Materials Engineering

Istanbul Technical University

Research output: Contribution to journal › Article › peer-review

27 Citations (Scopus)

Abstract

To directly synthesise hexagonal tungsten oxide that has enhanced photocatalytic activity, we studied the solution combustion synthesis using oxalic acid as fuel. The experimental results indicated that fuel to oxidizer ratio is the key for the crystallite size of the powders which varied from 27.96 nm to 42.27 nm for the ratio of 1 and 5, respectively. Specific surface area of the WO₃ powder was measured as 17.5 m²/g produced with the fuel to oxidizer ratio of 1. Photocatalytic activity of obtained powders were investigated by methylene blue degradation under sunlight. The best photocatalytic degradation efficiency was found to be 98.95% within 60 min of the initial MB concentration for the powder synthesized with fuel to oxidizer ratio of 5. The band gap energies were estimated within the range of visible light having the value of 3.65 eV and 3.47 eV. So that, as synthesized powders were suitable to be used as visible light photocatalyst for wastewater treatment.

Original language	English
Article number	122152
Journal	Materials Chemistry and Physics
Volume	240
DOIs	https://doi.org/10.1016/j.matchemphys.2019.122152
Publication status	Published - 15 Jan 2020

Bibliographical note

Publisher Copyright:
© 2019 Elsevier B.V.

Keywords

Hexagonal WO
Photocatalysts
Solution combustion synthesis
Visible light

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10.1016/j.matchemphys.2019.122152

Cite this

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title = "Single step solution combustion synthesis of hexagonal WO3 powders as visible light photocatalysts",

abstract = "To directly synthesise hexagonal tungsten oxide that has enhanced photocatalytic activity, we studied the solution combustion synthesis using oxalic acid as fuel. The experimental results indicated that fuel to oxidizer ratio is the key for the crystallite size of the powders which varied from 27.96 nm to 42.27 nm for the ratio of 1 and 5, respectively. Specific surface area of the WO3 powder was measured as 17.5 m2/g produced with the fuel to oxidizer ratio of 1. Photocatalytic activity of obtained powders were investigated by methylene blue degradation under sunlight. The best photocatalytic degradation efficiency was found to be 98.95% within 60 min of the initial MB concentration for the powder synthesized with fuel to oxidizer ratio of 5. The band gap energies were estimated within the range of visible light having the value of 3.65 eV and 3.47 eV. So that, as synthesized powders were suitable to be used as visible light photocatalyst for wastewater treatment.",

keywords = "Hexagonal WO, Photocatalysts, Solution combustion synthesis, Visible light",

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AU - Kaplan, S. Samet

AU - Sonmez, M. Seref

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N2 - To directly synthesise hexagonal tungsten oxide that has enhanced photocatalytic activity, we studied the solution combustion synthesis using oxalic acid as fuel. The experimental results indicated that fuel to oxidizer ratio is the key for the crystallite size of the powders which varied from 27.96 nm to 42.27 nm for the ratio of 1 and 5, respectively. Specific surface area of the WO3 powder was measured as 17.5 m2/g produced with the fuel to oxidizer ratio of 1. Photocatalytic activity of obtained powders were investigated by methylene blue degradation under sunlight. The best photocatalytic degradation efficiency was found to be 98.95% within 60 min of the initial MB concentration for the powder synthesized with fuel to oxidizer ratio of 5. The band gap energies were estimated within the range of visible light having the value of 3.65 eV and 3.47 eV. So that, as synthesized powders were suitable to be used as visible light photocatalyst for wastewater treatment.

AB - To directly synthesise hexagonal tungsten oxide that has enhanced photocatalytic activity, we studied the solution combustion synthesis using oxalic acid as fuel. The experimental results indicated that fuel to oxidizer ratio is the key for the crystallite size of the powders which varied from 27.96 nm to 42.27 nm for the ratio of 1 and 5, respectively. Specific surface area of the WO3 powder was measured as 17.5 m2/g produced with the fuel to oxidizer ratio of 1. Photocatalytic activity of obtained powders were investigated by methylene blue degradation under sunlight. The best photocatalytic degradation efficiency was found to be 98.95% within 60 min of the initial MB concentration for the powder synthesized with fuel to oxidizer ratio of 5. The band gap energies were estimated within the range of visible light having the value of 3.65 eV and 3.47 eV. So that, as synthesized powders were suitable to be used as visible light photocatalyst for wastewater treatment.

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