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首页> 外文期刊>Applied Surface Science >A facile preparation of TiO2/ACF with C-Ti bond and abundant hydroxyls and its enhanced photocatalytic activity for formaldehyde removal
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A facile preparation of TiO2/ACF with C-Ti bond and abundant hydroxyls and its enhanced photocatalytic activity for formaldehyde removal

机译：一种具有C-Ti键和丰富羟基的TiO2 / ACF的简便制备方法及其增强的光催化除甲醛活性

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The quantum yields and efficiency(ACF) was prepared via a modified deposition-precipitation method to facilitate its photon absorption and of photogenerated charge carriers have been the major issues for photocatalysis on titania catalyst. The TiO2/ACF catalyst with anatase TiO2 uniformly dispersed on activated carbon fibers electron transfer, thus improve the quantum yields and efficiency of the photogenerated electrons and holes. XPS analysis on the catalyst demonstrates the existence of Ti3+ and Ti2+ species, C-Ti bond and abundant hydroxyls, which are also proved by UV-vis DRS and TG-DSC analysis. It is believed that the acid environment in preparation plays an essential role in the formation of C-Ti bond and surface hydroxyls, which can be tuned by changing hydrothermal synthesis time. The C-Ti bond can improve the electron transfer in the catalyst and the substantial surface hydroxyls lead to high absorption for UV lines and enhanced adsorption of water and formaldehyde, resulting in more active OH free radicals and the outstanding photocatalytic activity of TiO2/ACF, which is much higher than the titania powder for photocatalytic removal of low concentration formaldehyde. The essential role of surface hydroxyls for photocatalytic activity was confirmed surpassing that of chemical bond between carbon and titanium in TiO2-carbon composite for the first time. (C) 2017 Elsevier B.V. All rights reserved.
机译：通过改进的沉积-沉淀方法制备了量子产率和效率（ACF）以促进其光子吸收，光生载流子一直是二氧化钛催化剂光催化的主要问题。带有锐钛矿型TiO2的TiO2 / ACF催化剂均匀地分散在活性炭纤维上进行电子转移，从而提高了光生电子和空穴的量子产率和效率。催化剂的XPS分析表明存在Ti3 +和Ti2 +物种，C-Ti键和丰富的羟基，这也由UV-vis DRS和TG-DSC分析证明。据信，制备中的酸环境在C-Ti键和表面羟基的形成中起着至关重要的作用，这可以通过改变水热合成时间来调节。 C-Ti键可改善催化剂中的电子转移，大量的表面羟基可导致UV线的高吸收性以及对水和甲醛的增强吸附，从而产生更多的OH自由基和TiO2 / ACF出色的光催化活性，它比用于光催化去除低浓度甲醛的二氧化钛粉末要高得多。首次证实表面羟基对光催化活性的重要作用超过了TiO2-碳复合材料中碳和钛之间的化学键。 （C）2017 Elsevier B.V.保留所有权利。

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