物理化学学报2012，Vol.28Issue(5)：1223-1229,7.DOI:10.3866/PKU.WHXB201202234
改性碳纳米管常温下吸附分离低浓度CO2
Adsorption of Low Concentration CO2 by Modified Carbon Nanotubes under Ambient Temperature
摘要
Abstract
Solid amine adsorbents for low concentration CO2 removal were developed using carbon nanotubes (CNTs) impregnated with tetraethylenepentamine (TEPA) and triethylenetetramine (TETA). The adsorbents were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier-transform infrared spectroscopy (FITR), Nz adsorption/desorption, elemental analysis and thermogravimetric analysis (TGA). After impregnation, the shapes, fundamental channels and pore structures of the adsorbents were unchanged. However, the surface area and pore volume decreased. The adsorption behavior toward low concentration CO2 was investigated in a fixed-bed column. The results indicated that the adsorption capacity was enhanced substantially by modification. The CO2 adsorption capacity of CNTs-TEPA was higher than that of CNTs-TETA with the same amount of amine loading. The adsorption capacity increased steadily from 126.7 to 139.3 mg · g-1 for CNTs-TEPA and from 101.2 to 110.4 mg · g-1 for CNTs-TETA as the temperature increased from 20 to 30 ℃. The adsorption capacity of the raw CNTs experienced a modest increase, but began to decrease gradually with further temperature increases. Suyadal and Yasyerli deactivation models were applied to investigate the experimental breakthrough curves of raw and modified CNTs. It was concluded that the Yasyerli deactivation model is more appropriate to analyze the breakthrough curves of CO2 adsorption on solid amine adsorbents.关键词
碳纳米管/CO2吸附/三乙烯四胺/四乙烯五胺/失活模型Key words
Carbon nanotube/ Cd adsorption/ Triethylenetetramine/ Tetraethylenepentamine/ Deactivation model分类
化学化工引用本文复制引用
叶青,张瑜,李茗,施耀..改性碳纳米管常温下吸附分离低浓度CO2[J].物理化学学报,2012,28(5):1223-1229,7.基金项目
国家自然科学基金(20976159)资助项目 （20976159）
