title: Capture of carbon dioxide by amine-loaded as-synthesized TiO2 nanotubes.
abstract: 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 degrees 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.
authors.affiliation: School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing, PR China.
authors.forename: Fujiao
authors.initials: F
authors.lastname: Song
authors.forename: Yunxia
authors.initials: Y
authors.lastname: Zhao
authors.forename: Huiling
authors.initials: H
authors.lastname: Ding
authors.forename: Yan
authors.initials: Y
authors.lastname: Cao
authors.forename: Jie
authors.initials: J
authors.lastname: Ding
authors.forename: Yunfei
authors.initials: Y
authors.lastname: Bu
authors.forename: Qin
authors.initials: Q
authors.lastname: Zhong
mesh_terms: D000327:Adsorption; D000393:Air Pollutants / Q000737:chemistry / Q000302:isolation & purification*; D000588:Amines / Q000737:chemistry*; D002245:Carbon Dioxide / Q000737:chemistry / Q000302:isolation & purification*; D052918:Environmental Restoration and Remediation; D043942:Nanotubes / Q000737:chemistry*; D014025:Titanium / Q000737:chemistry*
chemical_list: D000393:Air Pollutants; D000588:Amines; D002245:Carbon Dioxide; C009495:titanium dioxide; D014025:Titanium