纤维素/生物炭冰晶：吸附动力学和等温线的研究,Langmuir

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纤维素/生物炭冰晶：吸附动力学和等温线的研究
Langmuir ( IF 3.7 ) Pub Date : 2021-03-05 , DOI: 10.1021/acs.langmuir.1c00123
Lídia Kunz Lazzari ₁ , Daniele Perondi ₂ , Ademir José Zattera ₂ , Ruth Marlene Campomanes Santana ₁

Affiliation

这项工作的目的是通过等温模型和吸附动力学来表征和研究纤维素/生物炭冷冻凝胶的吸附过程行为。的冷冻凝胶，从由0.75和1.5％机械开纤w / w的所述的未漂白长纤维纤维素得到的纤维素悬浮液产生的松elliotti物种。向该悬浮液中加入5、10和20％w / w（相对于纤维素质量）的生物炭；然后，将悬浮液冷冻并冷冻干燥。之后，将2 mL甲基三甲氧基硅烷（MTMS）沉积在冰冻凝胶上。除了研究吸附动力学和等温线外，还对冰晶进行了表征分析，包括比重，孔隙率和吸附容量。这些冰晶的孔隙率超过90％，比重小于0.035 g cm ^–3。异质吸附能力随所用纤维素的浓度而变化，并且在纤维素冰凝胶中添加5％w / w的生物炭时，获得了最高的吸附能力，其中石油为73 gg ^–1，石油为54 gg ^–1SAE20W50油。在吸附等温线研究中，Freundlich模型最适合该过程。因此，可以得出结论，纤维素冷冻凝胶对石油的吸附过程发生在多层中。另外，在本发明中开发的纤维素/生物炭冷冻凝胶适用于有机液体的吸附。

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Cellulose/Biochar Cryogels: A Study of Adsorption Kinetics and Isotherms

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.

更新日期：2021-03-16

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