Capture of carbon dioxide by amine-loaded as-synthesized TiO2 nanotubes

• Published in: Environmental technology 2013-06, Vol.34 (11), p.1405-1410
• Main Authors: Song, Fujiao, Zhao, Yunxia, Ding, Huiling, Cao, Yan, Ding, Jie, Bu, Yunfei, Zhong, Qin
• Format: Article
• Language: English
• Subjects: absorption; adsorbents; Adsorption; Air Pollutants - chemistry; Air Pollutants - isolation & purification; amine-loaded; amines; Amines - chemistry; Applied sciences; carbon dioxide; Carbon Dioxide - chemistry; Carbon Dioxide - isolation & purification; Chemical engineering; desorption; Environmental Restoration and Remediation; environmental technology; ethanolamine; Exact sciences and technology; nanotubes; Nanotubes - chemistry; nitrogen; Pollution; Reactors; TiO; Titanium - chemistry; titanium dioxide; titanium-based adsorbents; transmission electron microscopy; X-ray diffraction
• ISSN: 1479-487X; 0959-3330; 1479-487X
• DOI: 10.1080/09593330.2012.751189

Titanium-based adsorbents for CO₂ capture were prepared through impregnating the as-synthesized TiO₂ nanotubes (TiNT) with four kinds of amines, namely monoethanolamine (MEA), ethylenediamine (EDA), triethylenetetramine (TETA) and tetraethylenepentamine (TEPA). The resultant samples were characterized by X-ray diffraction, low-temperature N₂ adsorption as well as transmission electron microscopy. The absorption of CO₂ was carried out in a dynamic packed column. The sample impregnated with TEPA showed a better adsorption capacity due to its higher amino groups content. In addition, CO₂ adsorption capacity increases as the amount of amine loaded increases. Therefore, TiNT-TEPA-69 showed the highest CO₂ adsorption capacity among the three samples impregnated with TETA; approximately 4.10 mmol/g at 30°C. In addition, the dynamic adsorption/desorption performance was investigated. The adsorption capacity of TiNT-TEPA-69 dropped slightly (about 2%) during a total of five cycles. The TiNT-TEPA-69 adsorbent exhibited excellent CO₂ adsorption/desorption performance.