Journal
ENERGY & FUELS
Volume 35, Issue 2, Pages 1620-1628Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.energyfuels.0c03832
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Funding
- Zhejiang Provincial Natural Science Foundation [LY21B070005]
- Foundation of Tianjin Key Laboratory of Brine Chemical Engineering and Resource Eco-utilization (Tianjin University of Science and Technology), People's Republic of China [BCERE202003]
- National Undergraduate Training Program for Innovation and Entrepreneurship of China [202010345025]
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In this study, N-doped porous carbonaceous CO2 sorbents were synthesized using hazelnut shell as raw materials. The materials exhibited high CO2 adsorption capacities, stable recyclability, selectivity, and dynamic capture performance, suggesting a high potential for future applications.
In this manuscript, N-doped porous carbonaceous CO2 sorbents were synthesized using biomass waste hazelnut shell as the raw materials, melamine as the nitridation agent, and KOH as the porogen. The resultant materials were carefully characterized by different techniques, and the results show that these samples possess a high amount of N content and highly developed porous structure. As a result, high CO2 adsorption capacities were found for this series of sorbents, up to 4.23 and 6.34 mmol/g at 1 bar and 25 and 0 degrees C, respectively. Comprehensive investigation indicates that, in addition to the well-known narrow microporosity and N content, the pore size distribution of the adsorbent also plays an important role in dictating the CO2 uptake under ambient conditions. Thus, it is proposed that the joint effect of the above three factors dictates the CO2 adsorption capacity of these sorbents. Moreover, these sorbents exhibit many other exceptional CO2 adsorption properties, such as stable recyclability, fast adsorption kinetics, suitable heat of adsorption, high CO2/N-2 selectivity, and good dynamic CO2 capture capacity. The wide availability and low cost of raw materials together with a straightforward synthesis procedure and excellent performance disclose the high potential of hazelnut-shell-derived carbons in CO2 capture.
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