A novel photoelectrochemical approach for efficient assessment of TiO2 pigments weatherability
A novel photoelectrochemical approach for efficient assessment of TiO2 pigments weatherability
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一种有效评估 TiO2 颜料耐候性的新型光电化学方法
DOI：
10.1016/j.powtec.2020.11.004
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发表时间：
2021-03-01
影响因子：
5.2
通讯作者：
He, Tao
中科院分区：
文献类型：
--
作者：
Guan, Rengui;He, Zhijuan;He, Tao
通过在颜料表面包覆绝缘性氧化物来抑制TiO 2的光活性，可以改善颜料的耐候性。建立一种有效、准确、灵敏度高的快速评价颜料耐候性的方法，是颜料生产过程中产品质量控制的需要。本工作提出了一种新的光电化学（PEC）的方法来评估各种商业TiO 2颜料，包括裸，Si-Al和Zr-Al氧化物涂层TiO 2的耐候性。这些样品的光活性通过监测它们对水氧化反应的阳极光电流来评价。由于表面氧化物抑制了空穴的界面转移，涂层TiO 2的光电流比裸TiO 2的光电流明显降低，表明其耐候性得到了改善。与传统的染料光降解评价方法相比，该方法具有检测速度快、灵敏度高等优点。此外，PEC的方法可以进行深入的探讨与不同的表面氧化层的TiO 2的光活性的抑制机制。(C)2020爱思唯尔B. V.保留所有权利。
Weatherability of TiO2 pigments can be improved by suppressing the TiO2 photoactivity with surface coating of insulating oxides. To develop an effective, accurate and high-sensitivity rapid weatherability assessment method is necessary for the product quality control dining the pigment production. The present work proposed a novel photoelectrochemical (PEC) approach to assess the weatherability of various commercial TiO2 pigments including the naked, Si-Al and Zr-Al oxide coated TiO2. The photoactivity of those samples was evaluated by monitoring their anodic photocurrents towards water oxidation reaction. Coated TiO2 showed much decreased photocurrents than the naked one due to the inhibited holes interfacial transfer by surface oxides, suggesting their improved weatherability. Compared to the traditional assessment method of dye photodegradation, the PEC approach is advantageous in both fast detection and high sensitivity. Moreover, the PEC approach can perform a deep exploration into the suppression mechanism of the TiO2 photoactivity with different surface oxide layers. (C) 2020 Elsevier B.V. All rights reserved.