Xiu Liu, Jing-Chao Xie, Qun-Yan Li, Li Liu, Qi Wei, Su-Ping Cui, Zuo-Ren Nie
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The effects of various synthetic parameters on the formation of hollow nitrogen-doped carbon nanoparticles were analyzed. The hollow nitrogen-doped carbon nanoparticles exhibited specific surface area of 1090 to 1716 m<sup>2</sup>/g and nitrogen content of 2.83 to 5.28%. At 273 K and 1 bar, the experimental results demonstrated the positive effects of the enriched pore structure and nitrogen doping on CO<sub>2</sub> adsorption. The optimum adsorption capacity of activated NPCS (ANPCS) was 5.11 mmol/g with excellent CO<sub>2</sub>/N<sub>2</sub> selectivity value of 20.44 at 273 K and 1 bar. The initial heat of adsorption value for ANPCS was 30.90 KJ/mol. Additionally, the hollow nitrogen-doped carbon nanoparticles retained 99.2% of the initial adsorbed amount after 5 cycles of adsorption. 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引用次数: 0
摘要
设计和合成具有独特结构和多种功能的多孔碳作为二氧化碳吸附剂是一个极具挑战性和引人入胜的研究课题。本研究考察了中空微多孔掺氮纳米碳颗粒(NPCS)的合成及其对二氧化碳的吸附。该研究以N-(2-氨基乙基)-3-氨基丙基三甲氧基硅烷(KH-792)为软模板,以二氧化硅溶胶为硬模板,采用经济实惠的间苯二酚和甲醛为碳前驱体,成功合成了高孔隙氮掺杂碳纳米颗粒。掺氮空心碳纳米颗粒呈现出明显的微孔-介孔结构,并具有两种不同尺度的介孔,分别为 9 nm 和 12 nm。分析了各种合成参数对掺氮空心碳纳米颗粒形成的影响。空心掺氮碳纳米粒子的比表面积为 1090 至 1716 m2/g,氮含量为 2.83 至 5.28%。在 273 K 和 1 bar 条件下,实验结果表明丰富的孔隙结构和氮掺杂对二氧化碳的吸附具有积极作用。在 273 K 和 1 bar 条件下,活化 NPCS(ANPCS)的最佳吸附容量为 5.11 mmol/g,CO2/N2 选择性为 20.44。ANPCS 的初始吸附热值为 30.90 KJ/mol。此外,中空掺氮纳米碳颗粒在 5 个吸附周期后保留了 99.2% 的初始吸附量。该材料优异的吸附性能不仅归功于其广泛的比表面积和富集的氮,还归功于其介孔和中空结构,这有利于二氧化碳的快速传输。
Synthesis of hollow micro-mesoporous nitrogen-doped carbon nanoparticles for enhanced CO2 capture
The design and synthesis of porous carbons with unique structures and diverse functionalities as CO2 adsorbents constitute a challenging and intriguing research topic. In this study, the synthesis of hollow micro-mesoporous nitrogen-doped carbon nanoparticles (NPCS) and its adsorption of CO2 were investigated. Highly porous nitrogen-doped carbon nanoparticles were successfully synthesized by using economically available resorcinol and formaldehyde as carbon precursors, with N-(2-aminoethyl)-3-aminopropyltrimethoxysilane (KH-792) as a soft template and silica sol as a hard template. The hollow nitrogen-doped carbon nanoparticles exhibit an evident microporous-mesoporous structure and have two different scales of mesopores with 9 nm and 12 nm, respectively. The effects of various synthetic parameters on the formation of hollow nitrogen-doped carbon nanoparticles were analyzed. The hollow nitrogen-doped carbon nanoparticles exhibited specific surface area of 1090 to 1716 m2/g and nitrogen content of 2.83 to 5.28%. At 273 K and 1 bar, the experimental results demonstrated the positive effects of the enriched pore structure and nitrogen doping on CO2 adsorption. The optimum adsorption capacity of activated NPCS (ANPCS) was 5.11 mmol/g with excellent CO2/N2 selectivity value of 20.44 at 273 K and 1 bar. The initial heat of adsorption value for ANPCS was 30.90 KJ/mol. Additionally, the hollow nitrogen-doped carbon nanoparticles retained 99.2% of the initial adsorbed amount after 5 cycles of adsorption. The excellent adsorption performance of the material can be ascribed not only to its extensive specific surface area and enriched nitrogen but also to its mesoporous and hollow structure, which facilitates rapid CO2 transport.
期刊介绍:
The primary objective of the Journal of Sol-Gel Science and Technology (JSST), the official journal of the International Sol-Gel Society, is to provide an international forum for the dissemination of scientific, technological, and general knowledge about materials processed by chemical nanotechnologies known as the "sol-gel" process. The materials of interest include gels, gel-derived glasses, ceramics in form of nano- and micro-powders, bulk, fibres, thin films and coatings as well as more recent materials such as hybrid organic-inorganic materials and composites. Such materials exhibit a wide range of optical, electronic, magnetic, chemical, environmental, and biomedical properties and functionalities. Methods for producing sol-gel-derived materials and the industrial uses of these materials are also of great interest.