Issue 41, 2013
From the journal:

RSC Advances

The effects of surface acidity on CO2adsorption over amine functionalized protonated titanate nanotubes†

Yue Liu,a   Jie Liu,a   Weiyuan Yao,a   Wanglai Cen,a   Haiqiang Wang,a   Xiaole Wenga  and  Zhongbiao Wu*ab  

* Corresponding authors

a Department of Environmental Engineering, Zhejiang University, Yuhangtang Road 866, Hangzhou 310058, P.R. China
E-mail: zbwu@zju.edu.cn
Fax: +86 0571 87953088
Tel: +86 571 88982863

b Zhejiang Provincial Engineering Research Center of Industrial Boiler & Furnace Flue Gas Pollution Control, Hangzhou 310058, P.R. China
E-mail: zbwu@zju.edu.cn
Fax: +86 571 87953088
Tel: +86 571 88982863

Abstract

In this paper, an infrared study has been performed on CO2 adsorption over polyethylenimine (PEI) functionalized protonated titanate nanotubes (PTNTs) prepared by a simple wet impregnation method. It was found that PTNTs had a large amount of acidity sites, which had strong interaction with the amino groups of the loaded PEI. This interaction could lead to good dispersion of PEI molecules, resulting in good performance in adsorption capacity, amine efficiency and adsorption kinetics. Both weakly and strongly adsorbed CO2 species formed under CO2 exposure, which were attributed to hydrogen-bonded species and carbamate groups, respectively. The existence of strong surface acidity increased the proportion of weakly adsorbed CO2 on the protonated amine species, which was beneficial to the adsorption–desorption cyclic performance. Furthermore, it was confirmed that the interaction between the support surface and amine also resulted in the superior thermal stability of amine-modified sorbents. Overall, our results suggested that suitably tuning surface acidity of the support could effectively facilitate CO2 adsorption.

Graphical abstract: The effects of surface acidity on CO2 adsorption over amine functionalized protonated titanate nanotubes

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Article information

DOI
https://doi.org/10.1039/C3RA42597E
Article type
Paper
Submitted
28 May 2013
Accepted
30 Jul 2013
First published
06 Aug 2013

RSC Adv., 2013,3, 18803-18810

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The effects of surface acidity on CO2 adsorption over amine functionalized protonated titanate nanotubes

Y. Liu, J. Liu, W. Yao, W. Cen, H. Wang, X. Weng and Z. Wu, RSC Adv., 2013, 3, 18803 DOI: 10.1039/C3RA42597E

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