Gao Jiadi, Wang Hao, Liu Xianyi, Zhang Zhiguo, Fan Zhigeng, Suo Yange
School of Mechanical and Energy Engineering, Zhejiang University of Science and Technology, Liuhe Road 318#, Hangzhou, Zhejiang Province, 310023, China.
School of Mechanical and Energy Engineering, Zhejiang University of Science and Technology, Liuhe Road 318#, Hangzhou, Zhejiang Province, 310023, China.
Environ Res. 2025 Jun 28;284:122245. doi: 10.1016/j.envres.2025.122245.
Herein, porous carbon materials rich in oxygen (O)-containing functional groups and with abundant micropores were synthesized by carbonizing lychee seeds activated with various activators at a relatively low temperature of 600 °C. The incorporation of potassium and sodium salts during activation effectively modulated both the surface O functionalities and the microporous structure of the resulting porous carbon materials. The influence of these characteristics on CO adsorption performance was systematically investigated. A multiple linear regression model was developed to evaluate the impact of key factors including cumulative pore volumes in the pore size range of 5-7 Å (V), 0-10 Å (V), and 0-20 Å (V), total pore volume (V), and the contents of C=OOH and C-OH groups on the CO adsorption capacity of the carbon materials at 1 bar and 25 °C. Results revealed that the C=OOH content is the most significant factor affecting CO uptake, while C-OH content and V also play important secondary roles. Notably, the LS-KOH-600 sample exhibited a high CO adsorption capacity, reaching 5 mmol/g at 25 °C and 7.15 mmol/g at 0 °C (1 bar). Furthermore, LS-KOH-600 demonstrated excellent CO/N selectivity (29.9) and good cyclic stability under simulated flue gas conditions.
在此，通过在600℃的相对低温下碳化用各种活化剂活化的荔枝种子，合成了富含含氧（O）官能团且具有丰富微孔的多孔碳材料。活化过程中钾盐和钠盐的引入有效地调节了所得多孔碳材料的表面O官能团和微孔结构。系统研究了这些特性对CO吸附性能的影响。建立了多元线性回归模型，以评估关键因素的影响，这些因素包括孔径范围为5-7 Å（V）、0-10 Å（V）和0-20 Å（V）的累积孔体积、总孔体积（V）以及C=OOH和C-OH基团的含量对碳材料在1 bar和25℃下的CO吸附容量的影响。结果表明，C=OOH含量是影响CO吸收的最显著因素，而C-OH含量和V也起着重要的次要作用。值得注意的是，LS-KOH-600样品表现出高CO吸附容量，在25℃下达到5 mmol/g，在0℃（1 bar）下达到7.15 mmol/g。此外，LS-KOH-600在模拟烟气条件下表现出优异的CO/N选择性（29.9）和良好的循环稳定性。
