title: Granular bamboo-derived activated carbon for high CO(2) adsorption: the dominant role of narrow micropores.
abstract: Cost-effective biomass-derived activated carbons with a high CO(2) adsorption capacity are attractive for carbon capture. Bamboo was found to be a suitable precursor for activated carbon preparation through KOH activation. The bamboo size in the range of 10-200 mesh had little effect on CO(2) adsorption, whereas the KOH/C mass ratio and activation temperature had a significant impact on CO(2) adsorption. The bamboo-derived activated carbon had a high adsorption capacity and excellent selectivity for CO(2) , and also the adsorption process was highly reversible. The adsorbed amount of CO(2) on the granular activated carbon was up to 7.0 mmol g(-1) at 273 K and 1 bar, which was higher than almost all carbon materials. The pore characteristics of activated carbons responsible for high CO(2) adsorption were fully investigated. Based on the analysis of narrow micropore size distribution of several activated carbons prepared under different conditions, a more accurate micropore range contributing to CO(2) adsorption was proposed. The volume of micropores in the range of 0.33-0.82 nm had a good linear relationship with CO(2) adsorption at 273 K and 1 bar, and the narrow micropores of about 0.55 nm produced the major contribution, which could be used to evaluate CO(2) adsorption on activated carbons.
authors.affiliation: State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, POPs Research Center, Tsinghua University, Beijing, 100084, PR China.
authors.forename: Haoran
authors.initials: H
authors.lastname: Wei
authors.forename: Shubo
authors.initials: S
authors.lastname: Deng
authors.forename: Bingyin
authors.initials: B
authors.lastname: Hu
authors.forename: Zhenhe
authors.initials: Z
authors.lastname: Chen
authors.forename: Bin
authors.initials: B
authors.lastname: Wang
authors.forename: Jun
authors.initials: J
authors.lastname: Huang
authors.forename: Gang
authors.initials: G
authors.lastname: Yu
mesh_terms: D000327:Adsorption; D018533:Biomass; D002245:Carbon Dioxide / Q000302:isolation & purification*; D002606:Charcoal / Q000737:chemistry*; D006358:Hot Temperature; D008855:Microscopy, Electron, Scanning; D016062:Porosity; D031787:Sasa / Q000737:chemistry*; D013499:Surface Properties
chemical_list: D002245:Carbon Dioxide; D002606:Charcoal