Operando Analysis of Electron Accumulation in Titanium(IV) Oxide Particles in an Aqueous Suspension Using a Photoacoustic Spectroscopic Method

The time course of photoabsorption of an aqueous suspension of titanium­(IV) oxide (TiO2) particles was studied using photoacoustic (PA) spectroscopy. In the absence of an electron acceptor and the presence of an electron donor, ultraviolet irradiation increased PA intensity because photoabsorption...

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Published inJournal of physical chemistry. C Vol. 123; no. 1; pp. 222 - 226
Main Authors Murakami, Naoya, Shinoda, Tatsuki
Format Journal Article
LanguageEnglish
Published American Chemical Society 10.01.2019
Subjects
electrons
methylene blue
photocatalysis
physical chemistry
spectroscopy
titanium
titanium dioxide
ultraviolet radiation
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ISSN1932-7447
1932-7455
1932-7455
DOI10.1021/acs.jpcc.8b10566

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Abstract The time course of photoabsorption of an aqueous suspension of titanium­(IV) oxide (TiO2) particles was studied using photoacoustic (PA) spectroscopy. In the absence of an electron acceptor and the presence of an electron donor, ultraviolet irradiation increased PA intensity because photoabsorption of the suspension increased due to trivalent titanium (Ti3+) species generated by electron accumulation in TiO2 particles. In contrast, the addition of methylene blue (MB) as an acceptor caused a decrease in PA intensity, indicating that accumulated electrons were consumed by reduction of MB to colorless leuco-MB. The results for various TiO2 particles indicated that Ti3+ density is determined by this method. Moreover, the measurement can be applicable to quantitative operando analysis for accumulated electrons in a photocatalytic reaction.
AbstractList The time course of photoabsorption of an aqueous suspension of titanium­(IV) oxide (TiO2) particles was studied using photoacoustic (PA) spectroscopy. In the absence of an electron acceptor and the presence of an electron donor, ultraviolet irradiation increased PA intensity because photoabsorption of the suspension increased due to trivalent titanium (Ti3+) species generated by electron accumulation in TiO2 particles. In contrast, the addition of methylene blue (MB) as an acceptor caused a decrease in PA intensity, indicating that accumulated electrons were consumed by reduction of MB to colorless leuco-MB. The results for various TiO2 particles indicated that Ti3+ density is determined by this method. Moreover, the measurement can be applicable to quantitative operando analysis for accumulated electrons in a photocatalytic reaction.
The time course of photoabsorption of an aqueous suspension of titanium(IV) oxide (TiO₂) particles was studied using photoacoustic (PA) spectroscopy. In the absence of an electron acceptor and the presence of an electron donor, ultraviolet irradiation increased PA intensity because photoabsorption of the suspension increased due to trivalent titanium (Ti³⁺) species generated by electron accumulation in TiO₂ particles. In contrast, the addition of methylene blue (MB) as an acceptor caused a decrease in PA intensity, indicating that accumulated electrons were consumed by reduction of MB to colorless leuco-MB. The results for various TiO₂ particles indicated that Ti³⁺ density is determined by this method. Moreover, the measurement can be applicable to quantitative operando analysis for accumulated electrons in a photocatalytic reaction.
Author Shinoda, Tatsuki
Murakami, Naoya
AuthorAffiliation Department of Applied Chemistry, Faculty of Engineering
Graduate School of Life Science and Systems Engineering
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  organization: Graduate School of Life Science and Systems Engineering
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Snippet The time course of photoabsorption of an aqueous suspension of titanium­(IV) oxide (TiO2) particles was studied using photoacoustic (PA) spectroscopy. In the...
The time course of photoabsorption of an aqueous suspension of titanium(IV) oxide (TiO₂) particles was studied using photoacoustic (PA) spectroscopy. In the...
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SubjectTerms electrons
methylene blue
photocatalysis
physical chemistry
spectroscopy
titanium
titanium dioxide
ultraviolet radiation
Title Operando Analysis of Electron Accumulation in Titanium(IV) Oxide Particles in an Aqueous Suspension Using a Photoacoustic Spectroscopic Method
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