The fabrication of porous N-doped carbon from widely available urea formaldehyde resin for carbon dioxide adsorption
The fabrication of porous N-doped carbon from widely available urea formaldehyde resin for carbon dioxide adsorption
复制标题
用广泛使用的脲醛树脂制备多孔氮掺杂碳用于二氧化碳吸附
DOI：
10.1016/j.jcis.2013.10.061
复制
发表时间：
2014-02-15
影响因子：
9.9
通讯作者：
Yan, Zifeng
中科院分区：
文献类型：
--
作者：
Liu, Zhen;Du, Zhenyu;Yan, Zifeng
氮掺杂的碳材料构成了丰富的微孔和碱性氮物种，具有用于CO2捕获的潜在实施方案。本文采用廉价易得的脲醛树脂为原料，经炭化、KOH活化处理，制备了高含氮量的多孔炭材料。CO2捕集实验表明，UFCA-2-600在25 ℃和1个大气压下具有3.21 mmol g（-1）的高吸附容量。XRD、SEM、XPS和FT-IR分析表明，经高温炭化和强碱活化后，样品仍保持类石墨结构。纹理分析表明，狭窄的微孔，特别是小于0.8 nm的，是有效的物理吸附机制的CO2吸附。化学演化研究表明，热炭化和KOH活化处理后的脲醛树脂的桥连胺和末端胺生成了类石墨嵌入的碱性氮基团，通过化学吸附机制富集了CO2容量。研究了CO2吸附量与孔径和碱性氮形态的关系，发现孔径和碱性氮形态分别以物理吸附和化学吸附的方式对CO2吸附起决定作用。(C)2013 Elsevier Inc. All rights reserved.
N-doped carbon material constitutes abundant of micropores and basic nitrogen species that have potential implementation for CO2 capture. In this paper, porous carbon material with high nitrogen content was simply fabricated by carbonizing low cost and widely available urea formaldehyde resin, and then followed by KOH activation. CO2 capture experiment showed high adsorption capacity of 3.21 mmol g(-1), at 25 degrees C under 1 atm for UFCA-2-600. XRD, SEM, XPS and FT-IR analysis confirmed that a graphitic-like structure was retained even after high temperature carbonization and strong base activation. Textural property analysis revealed that narrow micropores, especially below 0.8 nm, were effective for CO2 adsorption by physical adsorption mechanism. Chemical evolved investigation revealed that graphitic-like embedded basic nitrogen groups are generated from bridged and terminal amines of urea formaldehyde resin from thermal carbonization and KOH activation treatment, which is responsible for the enrichment of CO2 capacity by chemical adsorption mechanism. The relationship between CO2 adsorption capacity and pore size or basic N species was also studied, which turned out that both of them played crucial role by physical and chemical adsorption mechanism, respectively. (C) 2013 Elsevier Inc. All rights reserved.