Journal
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
Volume 59, Issue 15, Pages 7046-7053Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.iecr.9b02127
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Funding
- Zhejiang Provincial Natural Science Foundation [LQ17B060001]
- NSF of China [21706239]
- National Undergraduate Training Program for Innovation and Entrepreneurship of China [201810345024]
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In this paper, using carbonized hazelnut shells as the raw material and sodium amide as both activator and nitridation agent, N-enriched carbonaceous sorbents were successfully made by an one-step reaction at a relatively low temperature range of 500-600 degrees C. This strategy can effectively solve the corrosion problems caused by KOH activation, and avoid the tedious, time-consuming, and multistep nitriding-activation processes to prepare nitrogen-doped porous carbons. The resultant carbonaceous adsorbents were properly characterized, and their CO2 adsorption properties were carefully investigated. Excellent CO2 adsorption abilities, i.e., 4.32 and 6.23 mmol/g at 25 and 0 degrees C under 1 bar, respectively, were accomplished by these hazelnut-shell-based carbons. It is also found that their CO2 uptake under the ambient conditions are determined by the comprehensive effects of narrow microporosity, N content, pore size, and pore size distribution of the adsorbents rather than by any single factor. Besides the high CO2 uptake, these hazelnut-shell-derived carbons also display many other outstanding CO2 capture properties such as moderate heat of adsorption, high selectivity of CO2/N-2, fast adsorption kinetics, good recyclability, and dynamic CO2 capture capacity. Excellent CO2 capture properties, using waste as precursor, and a facile preparation strategy make these hazelnut-shell-based carbons attractive in CO2 capture.
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