期刊
ACS OMEGA
卷 5, 期 36, 页码 23460-23467出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsomega.0c03497
关键词
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资金
- National Natural Science Foundation of China [21663026, 51462031, 11764036, 11564034]
- Program for Young Talent of SEAC [(2018) 98]
- National Natural Science Foundation of Gansu Province [1606RJZA064, 17JR5RA283]
- project of science and technology of Gansu Province [17YF1GA025]
- [31920150244]
- [31920150245]
- [31920170008]
- [31920190006]
Here, hierarchical porous nitrogen-containing activated carbons (N-ACs) were prepared with LiCl-ZnCl2 molten salt as a template derived from cheap chitosan via simple one-step carbonization. The obtained N-ACs with the highest specific surface area of 2025 m(2) g(-1) and a high nitrogen content of 5.1 wt % were obtained using low molten salt/chitosan mass ratio (3/1) and moderate calcination temperature (1000 degrees C). Importantly, using these N-ACs as CO2 solid-state adsorbents, the maximum CO2 capture capacities could be up to 7.9/5.6 mmol g(-1) at 0 degrees C/25 degrees C under 1 bar pressure, respectively. These CO2 capture capacities of N-ACs were the highest compared to reported biomass-derived carbon materials, and these values were also comparable to most of porous carbon materials. Moreover, as-made N-ACs also showed good selectivity for CO2/N-2 separation and excellent recyclability. The unique hierarchical porous structure of N-ACs thus provided the right combination of adsorbent properties and could enable the design of high-performance CO2 solid adsorbents.
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