Adsorption of acetaldehyde onto carbide-derived carbon modified by oxidation
Adsorption of acetaldehyde onto carbide-derived carbon modified by oxidation
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DOI：
10.1016/j.cej.2015.03.107
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发表时间：
2015-08
影响因子：
15.1
通讯作者：
Hongyan Wang;Yifei Sun;Tianle Zhu;Wenzheng Wang;H. Deng
中科院分区：
文献类型：
--
作者：
Hongyan Wang;Yifei Sun;Tianle Zhu;Wenzheng Wang;H. Deng
研究了乙醛在硝酸、过氧化氢和空气修饰的碳化碳(CDC)上的吸附。用氮气吸附、傅里叶变换红外光谱、程序升温脱附和X射线光电子能谱等手段对改性前后的CDC进行了物化性能表征。结果表明，氧化改性，尤其是硝酸处理能显著提高CDC对乙醛的吸附性能。改性后的CDC中羧酸、酸酐等酸性含氧基团的增加，导致吸附性能的提高。密度泛函理论计算和原位漫反射红外光谱表明，这些酸性含氧基团与乙醛分子具有较强的氢键作用，从而提高了吸附性能。
The adsorption of acetaldehyde over carbide-derived carbon (CDC) modified with nitric acid, hydrogen peroxide, or air was investigated. The physicochemical properties of the original and modified CDCs were characterized by N2adsorption, Fourier transform infrared spectrometer, temperature programmed desorption and X-ray photoelectron spectroscopy. It was observed that the oxidation modification, especially the nitric acid treatment, could significantly enhance the adsorption performance of CDC for acetaldehyde. The increase of acidic oxygen-containing groups like carboxylic acids and anhydrides in the modified CDCs results in the increase of adsorption performance. The density functional theory calculations and in situ Diffuse Reflectance Infrared Fourier Transform Spectroscopy show that these acidic oxygen-containing groups display strong hydrogen bonding interactions with acetaldehyde molecule, leading to the enhanced adsorption performance.