Probing the role of O-containing groups in CO2adsorption of N-doped porous activated carbon
Wang, Min1,2,3; Fan, Xiangqian1; Zhang, Lingxia1; Liu, Jianjun1; Wang, Beizhou1; Cheng, Ruolin1; Li, Mengli4; Tian, Jianjian1; Shi, Jianlin1
Source PublicationNanoscale
AbstractPorous activated carbons (PACs) are promising candidates to capture CO2through physical adsorption because of their chemical stability, easy-synthesis, cost-effectiveness and good recyclability. However, their low CO2adsorption capacity, especially low CO2/N2selectivity, has limited their practical applications. In this work, an optimized PAC with a large specific surface area, a small micropore size, and a large micropore volume has been synthesized by one-step carbonization/activation of casein using K2CO3as a mild activation agent. It showed a remarkably enhanced CO2adsorption capacity as high as 5.78 mmol g-1and an excellent CO2/N2selectivity of 144 (25 °C, 1 bar). Based on DFT calculations and experimental results, the coexistence of adjacent pyridinic N and -OH/-NH2species was proposed for the first time to make an important contribution to the ultra-high CO2adsorption performance, especially CO2/N2selectivity. This work provides effective guidance to design PAC adsorbents with high CO2adsorption performance. The content of pyridine N combined with -OH/-NH2was further elevated by additional nitrogen introduction, resulting in a further enhanced CO2adsorption capacity up to 5.96 mmol g-1(25 °C, 1 bar). All these results suggest that, in addition to the well-defined pore structure, pyridinic N with neighboring OH or NH2species played an important role in enhancing the CO2adsorption performance of PACs, thus providing effective guidance for the rational design of CO2adsorbents. © 2017 The Royal Society of Chemistry.
EI Accession Number20174704444590
EI KeywordsCarbon dioxide
EI Classification Number801 Chemistry - 802.2 Chemical Reactions - 802.3 Chemical Operations - 804 Chemical Products Generally - 804.2 Inorganic Compounds - 911.2 Industrial Economics - 931.2 Physical Properties of Gases, Liquids and Solids
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Document Type期刊论文
Affiliation1.State Key Lab of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, 1295 Ding-xi Road, Shanghai; 200050, China;
2.University of Chinese Academy of Sciences, No. 19A Yuquan Road, Beijing; 100049, China;
3.School of Materials Science and Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai; 200237, China;
4.School of Biology and Chemical Engineering, Jiaxing University, Jiaxing Zhejiang; 314001, China
Recommended Citation
GB/T 7714
Wang, Min,Fan, Xiangqian,Zhang, Lingxia,et al. Probing the role of O-containing groups in CO2adsorption of N-doped porous activated carbon[J]. Nanoscale,2017,9(44):17593-17600.
APA Wang, Min.,Fan, Xiangqian.,Zhang, Lingxia.,Liu, Jianjun.,Wang, Beizhou.,...&Shi, Jianlin.(2017).Probing the role of O-containing groups in CO2adsorption of N-doped porous activated carbon.Nanoscale,9(44),17593-17600.
MLA Wang, Min,et al."Probing the role of O-containing groups in CO2adsorption of N-doped porous activated carbon".Nanoscale 9.44(2017):17593-17600.
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