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Adsorption of carbon dioxide on amine-modified TiO2 nanotubes
作者姓名:Fujiao Song  Yunxia Zhao  Qin Zhong
作者单位:School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China;School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China;School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
基金项目:This work was supported by the Industry-Academia Cooperation Innovation Fund Projects of Jiangsu Province (No. BY2012025).
摘    要:TiO2 nanotubes (TiNT) were prepared by a hydrothermal treatment and modified by three kinds of amines,namely ethylenediamine,polyetherimide and tetraethylenepentamine (TEPA),to study their CO2 adsorption properties from gas streams.The resultant samples were characterized by X-ray diffraction,transmission electron microscopy,and infrared spectroscopy,as well as low temperature N 2 adsorption.CO2 capture was investigated in a dynamic packed column at 30℃.TEPA-modified TiO2 nanotubes showed the highest adsorption capacity of 167.64 mg/g because it had the highest amino-group content among the three amines.CO2 fixation on TiNT impregnated by TEPA was investigated at 30,50,and 70℃,and the adsorption capacity increased slightly with temperature.Following the adsorption step,the sorbents were regenerated by temperature programmed desorption,and the TiNT-TEPA sample,as CO2 sorbent,was found to be readily regenerated and energy-efficient.The cycle test also revealed that the TiNT-TEPA adsorbent is fairly stable,with only a 5% drop in the adsorption capacity after 10 adsorption/desorption cycles.In addition,the CO2 adsorption behavior was investigated with the deactivation model,and which showed an excellent prediction for the TiNT-TEPA breakthrough curves.

关 键 词:CO2  capture  TiO2  nanotubes  amine-modified  dynamic  adsorption  deactivation  model
收稿时间:17 June 2012
修稿时间:27 October 2012

Adsorption of carbon dioxide on amine-modified TiO2 nanotubes
Fujiao Song,Yunxia Zhao,Qin Zhong.Adsorption of carbon dioxide on amine-modified TiO2 nanotubes[J].Journal of Environmental Sciences,2013,25(3):554-560.
Authors:Fujiao Song  Yunxia Zhao and Qin Zhong
Institution:School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
Abstract:TiO2 nanotubes (TiNT) were prepared by a hydrothermal treatment and modified by three kinds of amines, namely ethylenediamine, polyetherimide and tetraethylenepentamine (TEPA), to study their CO2 adsorption properties from gas streams. The resultant samples were characterized by X-ray diffraction, transmission electron microscopy, and infrared spectroscopy, as well as low temperature N2 adsorption. CO2 capture was investigated in a dynamic packed column at 30°C. TEPA-modified TiO2 nanotubes showed the highest adsorption capacity of 167.64 mg/g because it had the highest amino-group content among the three amines. CO2 fixation on TiNT impregnated by TEPA was investigated at 30, 50, and 70°C, and the adsorption capacity increased slightly with temperature. Following the adsorption step, the sorbents were regenerated by temperature programmed desorption, and the TiNT-TEPA sample, as CO2 sorbent, was found to be readily regenerated and energy-efficient. The cycle test also revealed that the TiNT-TEPA adsorbent is fairly stable, with only a 5% drop in the adsorption capacity after 10 adsorption/desorption cycles. In addition, the CO2 adsorption behavior was investigated with the deactivation model, and which showed an excellent prediction for the TiNT-TEPA breakthrough curves.
Keywords:CO2 capture  TiO2 nanotubes  amine-modified  dynamic adsorption  deactivation model
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