Reyes Molina Eliezer A, Park Seonghyun, Park Sunkyu, Kelley Stephen S
North Carolina State University, Department of Forest Biomaterials, 2820 Faucette Dr, Raleigh, NC 27607, USA.
Idaho National Laboratory, Energy and Environmental Science & Technology, Bioenergy Feedstock Technology Department. 750 MK Simpson Blv, Idaho Falls, ID 83415, USA.
Heliyon. 2023 Apr 27;9(5):e15765. doi: 10.1016/j.heliyon.2023.e15765. eCollection 2023 May.
In this study, the production and characterization of activated carbons (ACs) from agricultural and forest residue using physical activation are discussed. Biomass-based biochars produced during fast pyrolysis process is introduced as alternative precursors to produce AC and the integrated process for the co-production of porous adsorbent materials from biochar via the fast pyrolysis process is suggested. Moderate surface areas and good adsorption capacities were obtained from switchgrass (SWG) and pine tops (PT) based AC. The surface areas were 959 and 714 m/g for SWG- and PT-based AC, respectively. The adsorption capacities using toluene as pollutant for two model systems of 180 and 300 ppm were measured and ranged between 441-711 and 432-716 mg/g for SWG-based and PT-based AC, respectively. The nitrogen adsorptive behavior, Lagergren pseudo-second-order kinetic (PSOK) model and kinetics isotherms studies describe a heterogeneous porous system, including a mesoporous fraction with the existence of a multilayer adsorption performance. The presence of micropores and mesopores in SWG- and PT-based AC suggests potential commercial applications for using pyrolytic biochars for AC production.
本研究讨论了利用物理活化法从农业和林业残余物制备活性炭（ACs）及其特性。介绍了快速热解过程中产生的基于生物质的生物炭作为制备AC的替代前驱体，并提出了通过快速热解过程从生物炭联产多孔吸附材料的集成工艺。基于柳枝稷（SWG）和松树梢（PT）的AC具有适中的比表面积和良好的吸附能力。基于SWG和PT的AC的比表面积分别为959和714 m²/g。测量了以甲苯为污染物、浓度为180和300 ppm的两种模型体系的吸附容量，基于SWG的AC和基于PT的AC的吸附容量分别在441 - 711和432 - 716 mg/g之间。氮吸附行为、Lagergren准二级动力学（PSOK）模型和动力学等温线研究描述了一个非均相多孔体系，包括具有多层吸附性能的中孔部分。基于SWG和PT的AC中微孔和中孔的存在表明热解生物炭用于制备AC具有潜在的商业应用价值。
