Acetaldehyde and acetic acid adsorption on TiO2 under dry and humid conditions
Acetaldehyde and acetic acid adsorption on TiO2 under dry and humid conditions
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DOI：
10.1016/j.cej.2014.10.089
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发表时间：
2015-03-15
影响因子：
15.1
通讯作者：
Locoge, N.
中科院分区：
文献类型：
--
作者：
Batault, F.;Thevenet, F.;Locoge, N.
吸附作用对挥发性有机物（VOC）的光催化氧化性能和动力学行为起着关键作用。它会导致VOC混合物的顺序处理，甚至光催化剂失活。这项工作的目的是确定定性和定量数据的VOC吸附P25二氧化钛。乙醛和乙酸在TiO 2上的吸附在干燥和潮湿的条件下进行了研究。实验中采用了三种方法：穿透曲线法、室温解吸法和程序升温解吸法。首先，分别研究了乙醛和乙酸的吸附。干燥和潮湿的实验提供了互补的信息，以确定吸附模式，根据文献。确定每种VOC的Langmuir模型参数（吸附常数（K）、可逆和不可逆最大吸附量（q（m，rev）和q（m，irr））以及吸附焓Δ H）。基于实验结果，考虑到乙醛和水分子之间的特殊相互作用，提出了乙醛和水的共吸附模型。对于乙酸，提出了反应吸附途径，并建立了反应吸附动力学模型。最后，为了了解多VOC相互作用的TiO 2表面上，乙醛和乙酸的顺序吸附进行了研究，并面对单一的VOC数据。因此，单一VOC吸附参数有助于理解和预测多VOC光催化氧化。(C)2014爱思唯尔有限公司版权所有。
Adsorption plays a key role in the volatile organic compound (VOC) photocatalytic oxidation performance and kinetic behavior. It can lead to VOC mixture sequential treatment or even photocatalyst deactivation. The aim of this work is to determine qualitative and quantitative data regarding VOC adsorption on P25 TiO2. Acetaldehyde and acetic acid adsorption on TiO2 have been studied under both dry and humid conditions. Three experimental methods have been used: breakthrough curves, room temperature desorptions and temperature-programmed desorptions. First, acetaldehyde and acetic acid adsorptions are studied individually. Dry and humid experiments provide complementary pieces of information to identify the adsorption modes, in accordance with literature. The Langmuir model parameters (adsorption constant (K), reversible and irreversible maximum adsorbed amounts (q(m,rev) and q(m,irr)), and adsorption enthalpy Delta H) are determined for each VOC. Based on experimental results, a model for acetaldehyde and water co-adsorption is proposed, taking into account the specific interaction between acetaldehyde and water molecule. Regarding acetic acid, a reactive adsorption pathway is proposed and a kinetic model is developed to describe the reactive adsorption. Finally, in order to understand multi-VOC interaction on TiO2 surface, the sequential adsorption of acetaldehyde and acetic acid is investigated and confronted with the single-VOC data. As a result, single VOC adsorption parameters are useful to understand and predict multi-VOC photocatalytic oxidation. (C) 2014 Elsevier B.V. All rights reserved.