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Evolution of physico-chemical properties of Dicranopteris linearis-derived activated carbon under various physical activation atmospheres.

ABSTRACT: This work emphasizes the effect of the physical activation using CO₂ and steam agents on the physicochemical properties of activated carbon produced from Dicranopteris linearis (D. linearis), a fern species widely distributed across tropic and subtropic ecoregions. The D. linearis-derived chars produced under pyrolysis at 400 °C for 1 h were activated in various CO₂-steam proportions. As revealed by the IR and Raman spectra, the structure of the activated chars was heavily dependent on the relative proportion of CO₂ and steam. The total specific surface area (SSA) of the activated chars proportionally increased with the increase in steam proportion and was comparable to the values of commercial activated char products. Specifically, the activation under CO₂^- and steam-saturated conditions has correspondingly resulted in SSA increasing from 89 to 653 m²g^-1 and from 89 to 1015 m²g^-1. Steam also enhanced the development of mesoporous structures of the D. linearis-derived char products, thereby extending their potential applications, particularly for industries that require high rigidity in the product such as pharmaceutical and cosmetic sectors.

SUBMITTER: Mai NT

PROVIDER: S-EPMC8277782 | biostudies-literature | 2021 Jul

REPOSITORIES: biostudies-literature

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Evolution of physico-chemical properties of Dicranopteris linearis-derived activated carbon under various physical activation atmospheres.

Mai Nga T NT Nguyen Minh N MN Tsubota Toshiki T Nguyen Phuong L T PLT Nguyen Nam H NH

Scientific reports 20210713 1

This work emphasizes the effect of the physical activation using CO<sub>2</sub> and steam agents on the physicochemical properties of activated carbon produced from Dicranopteris linearis (D. linearis), a fern species widely distributed across tropic and subtropic ecoregions. The D. linearis-derived chars produced under pyrolysis at 400 °C for 1 h were activated in various CO<sub>2</sub>-steam proportions. As revealed by the IR and Raman spectra, the structure of the activated chars was heavily ...[more]

PMID: 34257386

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Project description:It is crucial to increase the values of S BET/burn-off ratio to achieve activated carbon (AC) with a higher SO2 adsorption capacity at a low cost from flue gas. In this study, at first, Jixi bituminous coal was used as a raw material to prepare a series of pre-treated samples by oxidation treatment and adding different amounts of the FeCl3 catalyst. Then, the AC samples were prepared by pyrolysis under a N2 atmosphere and physical activation with CO2. Finally, the change in the physico-chemical structure of different samples was determined to study the effects of oxygen functional groups and FeCl3. The results show that the rapid growth of mesopores is mainly influenced by the evolution of oxygen functional groups, whereas the micropores are mainly influenced by the FeCl3 catalyst during pyrolysis. These effects can also further improve the size and the carbon type of the aromatic structure from a different perspective to promote the disordered microstructure of treated chars (1FeJXO15-800H, 3FeJXO15-800H and 6FeJXO15-800H) as compared to the ordered microstructure and less pores of the un-pretreated char (JX-800). Then, the active sites can no longer be consumed preferentially in the presence of the catalyst; this results in the continuous disordered conversion of the microstructure as compared to the ordered conversion of JX-800 char during activation. On the one hand, the developed initial pores of 1FeJXO15-800H, 3FeJXO15-800H, and 6FeJXO15-800H chars promote the favorable diffusion of activated gas, following the non-hierarchical development. On the other hand, the presence of Fe-based catalysts facilitates the etching of carbon structure and the rapid and continuous development of the micropores, hindering the severe carbon losses on the particle surface. Finally, the 3FeJXO15-800H char with a high value of S BET (1274.64 m2 g-1) at a low burn-off value (22.5%) has the highest S BET/burn-off ratio value of 56.65 m2 g-1/%, whereas the JX-800 char with a low value of S BET (564.19 m2 g-1) at a burn-off value of 58.2% has the lowest S BET/burn-off ratio value of 9.69 m2 g-1/%. Therefore, the presence of oxygen functional groups and FeCl3 has obviously changed the evolution of the physico-chemical structure in activated carbon to effectively enhance the values of S BET/burn-off.

Dataset Information

Evolution of physico-chemical properties of Dicranopteris linearis-derived activated carbon under various physical activation atmospheres.

Publications

Evolution of physico-chemical properties of Dicranopteris linearis-derived activated carbon under various physical activation atmospheres.

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