Effect of structural and compositional alterations on the adsorption and selectivity of CO2 in hazelnut shell-derived activated carbons

IF 2.5 4区材料科学 Q2 CHEMISTRY, APPLIED

Journal of Porous Materials Pub Date : 2024-11-27 DOI:10.1007/s10934-024-01697-3

Ying Xie, Zirui Wang, Yu Wang, Yu Liu, Haonan Zhang, Ruiqin Yang, Wenze Li, Elia Marin, Giuseppe Pezzotti, Wenliang Zhu

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Abstract

A high surface-area activated carbon was prepared from biomass of hazelnut shell (HS) using dual activators of KOH and Zn(NO₃)₂‧6H₂O. The texture properties of Hazelnut Shell-derived Activated Carbons (HSACs) can be controlled through adjusting the mass ratio of Zn(NO₃)₂‧6H₂O. According to CO₂ adsorption on HSACs, a remarkable uptake of 3.8 mmol g^-1and the highest ideal adsorbed solution theory selectivity of 44.4 for CO₂/N₂ at 1.0 bar and 298 K were observed in HSAC-2, which possessed lowest specific surface area, highest micropore volume, highest carboxyl and carbonyl and lowest ether and hydroxyl groups. The synergistic effect of pore morphology, and surface functional groups plays a critical role in the adsorption of CO₂. Excellent CO₂ adsorption and separation effect can be achieved by utilizing the structural properties of HS itself, demonstrating HSACs are biomass adsorbent for CO₂ with great development prospects.

Graphical abstracts

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利用KOH和Zn(NO3)2‧6H2O双重活化剂，从榛子壳生物质制备了高比表面积活性炭。通过调节 Zn(NO3)2‧6H2O 的质量比，可以控制榛果壳衍生活性炭（HSACs）的质地特性。根据二氧化碳在 HSACs 上的吸附情况，在 1.0 巴和 298 K 条件下，具有最小比表面积、最大微孔体积、最大羧基和羰基以及最小醚基和羟基的 HSAC-2 对 CO2/N2 的吸附量为 3.8 mmol g-1，理想吸附溶液理论选择性为 44.4。孔隙形态和表面官能团的协同作用对二氧化碳的吸附起着至关重要的作用。利用 HS 自身的结构特性，可以获得优异的 CO2 吸附和分离效果，这表明 HSACs 是一种具有广阔发展前景的 CO2 生物质吸附剂。

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来源期刊

Journal of Porous Materials 工程技术-材料科学：综合

CiteScore

4.80

自引率

7.70%

发文量

203

审稿时长

2.6 months

期刊介绍： The Journal of Porous Materials is an interdisciplinary and international periodical devoted to all types of porous materials. Its aim is the rapid publication of high quality, peer-reviewed papers focused on the synthesis, processing, characterization and property evaluation of all porous materials. The objective is to establish a unique journal that will serve as a principal means of communication for the growing interdisciplinary field of porous materials. Porous materials include microporous materials with 50 nm pores. Examples of microporous materials are natural and synthetic molecular sieves, cationic and anionic clays, pillared clays, tobermorites, pillared Zr and Ti phosphates, spherosilicates, carbons, porous polymers, xerogels, etc. Mesoporous materials include synthetic molecular sieves, xerogels, aerogels, glasses, glass ceramics, porous polymers, etc.; while macroporous materials include ceramics, glass ceramics, porous polymers, aerogels, cement, etc. The porous materials can be crystalline, semicrystalline or noncrystalline, or combinations thereof. They can also be either organic, inorganic, or their composites. The overall objective of the journal is the establishment of one main forum covering the basic and applied aspects of all porous materials.