| Autor: |
Kunz Lazzari L; Postgraduate Program in Mining, Metallurgical and Materials Engineering, Federal University of Rio Grande do Sul., Porto Alegre 91501-970, Brazil., Perondi D; Postgraduate Program in Engineering of Processes and Technologies, University of Caxias do Sul., Caxias do Sul 95070-560, Brazil., Zattera AJ; Postgraduate Program in Engineering of Processes and Technologies, University of Caxias do Sul., Caxias do Sul 95070-560, Brazil., Campomanes Santana RM; Postgraduate Program in Mining, Metallurgical and Materials Engineering, Federal University of Rio Grande do Sul., Porto Alegre 91501-970, Brazil. |
| Jazyk: |
angličtina |
| Zdroj: |
Langmuir : the ACS journal of surfaces and colloids [Langmuir] 2021 Mar 16; Vol. 37 (10), pp. 3180-3188. Date of Electronic Publication: 2021 Mar 05. |
| DOI: |
10.1021/acs.langmuir.1c00123 |
| Abstrakt: |
The objective of this work was to characterize and study the behavior of the adsorption process of cellulose/biochar cryogels through isotherm models and adsorption kinetics. The cryogels were produced from a cellulose suspension obtained by mechanical fibrillation of 0.75 and 1.5% w/w unbleached long-fiber cellulose of the Pinus elliotti species. Into this suspension, 5, 10, and 20% w/w (relative to cellulose mass) biochar were added; then, the suspension was frozen and freeze-dried. After this, 2 mL of methyltrimethoxysilane (MTMS) was deposited on the cryogels. Characterization analyses were performed on the cryogels, including specific mass and porosity and sorption capacity, in addition to the study of adsorption kinetics and isotherms. The cryogels showed a porosity of above 90% and a specific gravity of less than 0.035 g cm -3 . The heterogeneous sorption capacity varied according to the concentration of cellulose used, and with the addition of 5% w/w biochar in the cellulose cryogel, the highest sorption capacity was obtained, 73 g g -1 of petroleum and 54 g g -1 of SAE20W50 oil. In the study of adsorption isotherms, the Freundlich model best fitted the process. Therefore, it was concluded that the process of petroleum adsorption by the cellulose cryogel occurs in multiple layers. In addition, the cellulose/biochar cryogel developed in the present work is suitable for use in the adsorption of organic liquids. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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