Operando Analysis of Electron Accumulation in Titanium(IV) Oxide Particles in an Aqueous Suspension Using a Photoacoustic Spectroscopic Method
Operando Analysis of Electron Accumulation in Titanium(IV) Oxide Particles in an Aqueous Suspension Using a Photoacoustic Spectroscopic Method
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使用光声光谱法对水悬浮液中氧化钛 (IV) 颗粒的电子积累进行操作分析
DOI：
10.1021/acs.jpcc.8b10566
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
Shinoda Tatsuki
中科院分区：
文献类型：
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作者：
Murakami Naoya;Shinoda Tatsuki
采用光声光谱法研究了氧化钛（IV）颗粒水悬浮液的光吸收时间过程。在电子受体和电子供体的存在下，紫外线照射增加PA强度，因为悬浮液的光吸收增加，由于三价钛（Ti3+）的电子积累在TiO 2颗粒中产生的物种。相反，添加亚甲蓝（MB）作为受体导致PA强度降低，表明积累的电子被MB还原为无色MB所消耗。结果表明，用该方法测定了不同TiO2颗粒的Ti3+浓度。此外，该测量可应用于光催化反应中累积电子的定量操作分析。
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 TiO2particles. 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 TiO2particles 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.