期刊
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
卷 9, 期 6, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jece.2021.106709
关键词
CO2 capture; Amine adsorbent; Amine efficiency; Adsorption mechanism
资金
- National Natural Science Foundation ofChina, China [21606130]
- Province Key R&D Program of Jiangsu, China [BE2019735]
- National Key R&D Program of China, China [2017YFB0307304, 2017YFC0210903]
- State Key Laboratory of Materials-Oriented Chemical Engineering, China [ZK201610]
- Pri-ority Academic Program Development of Jiangsu Higher Education In-stitutions, China
- Project 333' of Jiangsu Province, China [BRA2016418]
In this study, a brush-like CTAC templating strategy was developed to prepare micro-mesoporous silica nanoparticles and TEPA-functionalized adsorbents with higher CO2 adsorption capacities under dry conditions. Kinetic and thermodynamic models were applied to investigate the control factors and adsorption behavior of CO2 adsorbents with brush-like CTAC, showing improved amine efficiency for practical applications of CO2 capture from air.
Amine adsorbents have been widely investigated for direct CO2 capture from air. However, the low amine efficiency of the widely-studied amine sorbents is the critical factor to hinder the practical application under dry conditions. Herein, we developed the brush-like cetyltrimethylammonium chloride (CTAC) templating strategy to prepare micro-mesoporous silica nanoparticles (MMSN-X) and TEPA-functionalized adsorbents (MMSN-X/TEPA-Y). The character of samples was investigated by transmission electron microscopy, N-2 adsorptiondesorption, Fourier transform infrared spectroscopy, thermal gravimetric analyzer and X-ray photoelectron spectroscopy. The adsorbent (MMSN-30/TEPA-50) with appropriate amount of brush-like CTAC exhibited higher CO2 adsorption capacities (3.68 mmol/gadsorbent under simulated dry air conditions) than that of the adsorbents with none or less additives. The kinetic and thermodynamic model were applied to investigate the adsorption rate control factors and adsorption behavior of CO2 adsorbents with brush-like CTAC. Moreover, with the effect of brush-like CTAC, the significant variation of adsorption product (conversion from carbamate (CO2/N = 0.5) to carbamic acid (CO2/N = 1)) was detected by in situ Fourier transform infrared spectroscopy. These results demonstrated that the combination of CO2 and amine was altered in the presence of brush-like CTAC and thereby the amine efficiency was enhanced, which could be expected to be an efficient adsorbent for CO2 from air in practical applications.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据