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首頁> 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

機(jī)譯：一種具有C-Ti鍵和豐富羥基的TiO2 / ACF的簡便制備方法及其增強(qiáng)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.
機(jī)譯：通過改進(jìn)的沉積-沉淀方法制備了量子產(chǎn)率和效率（ACF）以促進(jìn)其光子吸收，光生載流子一直是二氧化鈦催化劑光催化的主要問題。帶有銳鈦礦型TiO2的TiO2 / ACF催化劑均勻地分散在活性炭纖維上進(jìn)行電子轉(zhuǎn)移，從而提高了光生電子和空穴的量子產(chǎn)率和效率。催化劑的XPS分析表明存在Ti3 +和Ti2 +物種，C-Ti鍵和豐富的羥基，這也由UV-vis DRS和TG-DSC分析證明。據(jù)信，制備中的酸環(huán)境在C-Ti鍵和表面羥基的形成中起著至關(guān)重要的作用，這可以通過改變水熱合成時(shí)間來調(diào)節(jié)。 C-Ti鍵可改善催化劑中的電子轉(zhuǎn)移，大量的表面羥基可導(dǎo)致UV線的高吸收性以及對水和甲醛的增強(qiáng)吸附，從而產(chǎn)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濃度甲醛的二氧化鈦粉末要高得多。首次證實(shí)表面羥基對光催化活性的重要作用超過了TiO2-碳復(fù)合材料中碳和鈦之間的化學(xué)鍵。 （C）2017 Elsevier B.V.保留所有權(quán)利。

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