Sorption capacity of hydrophobic cellulose cryogels silanized by two different methods

Lazzari, Lídia Kunz; Zampieri, Vitória Boeira; Zanini, Márcia; Zattera, Ademir J.; Baldasso, Camila

doi:10.1007/s10570-017-1349-z

Cited by 46 publications

(28 citation statements)

References 34 publications

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“…An alternative strategy is to modify the NFC dispersions prior to the freeze or supercritical drying process. [108][109][110][111][112] In this way, the entire cellulose aerogel could be functionalized. For instance, Zhang et al 108 reported a facile process to prepare hydrophobic, exible, and low-density (#17.3 mg cm À3 ) cellulose aerogels by freeze-drying aqueous NFC suspensions with methyltrimethoxysilane (MTMS) as a silylating agent.…”

Section: Cellulose Nanomaterials and Wood For Oil/water Separation Anmentioning

confidence: 99%

Nanofibrillated cellulose composites and wood derived scaffolds for functional materials

2019

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Section: Cellulose Nanomaterials and Wood For Oil/water Separation Anmentioning

confidence: 99%

Nanofibrillated cellulose composites and wood derived scaffolds for functional materials

2019

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“…In their studies, based on different methods of silanization, Lazzari et al [26] obtained aerogels with 1.5% of unbleached CNFs of Pinus elliottii, with a sorption capacity in heterogeneous medium of 68.42 g•g −1 . The present study found lower values in relation to the sorption capacity found by Lazzari et al [26]. However, it was possible to observe that the silanization process provided greater mechanical resistance to the aerogels obtained.…”

Section: Journal Of Nanomaterialsmentioning

confidence: 99%

“…species without adding chemical solvents. Lazzari et al [26] also obtained aerogels of unbleached CNFs of the Pinus elliottii species without the addition of solvents.…”

Section: Introductionmentioning

confidence: 99%

Obtaining Hydrophobic Aerogels of Unbleached Cellulose Nanofibers of the Species Eucalyptus sp. and Pinus elliottii

Zanini

Lavoratti

Lazzari

et al. 2018

Journal of Nanomaterials

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The use of natural fibers from renewable and biodegradable sources in oleophilic sorbents, such as cellulose, has become an interesting alternative due to their excellent properties and sustainability. In addition to that, the low density of the aerogels obtained from cellulose is favorable for their use as sorbents. In this context, the objective of this study is to develop hydrophobic aerogels of unbleached cellulose nanofibers of the Eucalyptus sp. and Pinus elliottii. Cellulose samples were submitted to mechanical fibrillation to obtain cellulose nanofiber suspensions, followed by a chemical treatment with methyltrimethoxysilane and dried by freeze-drying to prepare the aerogels. The aerogels presented hydrophobic and oleophilic characteristics, including a water contact angle of 134°, sorption capacities in a heterogeneous medium of above 21.0 g·g−1, and oil removal efficiency greater than 88.5%. The Pinus elliottii nanofiber aerogels showed higher compressive strength when compared to the nanofiber aerogels of Eucalyptus sp.

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“…As amostras foram então congeladas em um ultra freezer a -80ºC por 24 horas e depois liofilizadas em um liofilizador da marca Lio Top -Modelo L101 (Brasil) por cerca de 70 h para a sublimação do gelo e secagem do aerogel. O método utilizado para a adição de MTMS à suspensão de celulose foi baseado no método utilizado por Lazzari et al [12], Zanini et al…”

Section: B Preparação Dos Aerogéisunclassified

Caracterização de aerogéis de celulose com adição de metiltrimetoxissilano (MTMS) para adsorção de petróleo

Lazzari¹,

Zampieri²,

Zanini³

et al. 2018

SCI

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A utilização de adsorventes é uma maneira eficaz para a remoção do óleo em terra ou água. Os aerogéis são uma classe de adsorventes, que são caracterizados pela sua estrutura altamente porosa e o seu baixo teor de sólidos, o que confere ao material uma elevada capacidade de adsorção de petróleo. No presente trabalho, foi avaliada a influência da concentração de celulose e metiltrimetoxissilano (MTMS) na capacidade de adsorção de petróleo do aerogel. Os aerogéis produzidos apresentaram baixa massa específica (menor que 0,025 g cm-3) e elevada porosidade (maior que 95%). Pelas micrografias é possível visualizar alterações na superfície da fibras, com a formação de um filme, enquanto que na análise dos espectros obtidos, bandas características do silano foram identificadas nas amostras com tratamento químico. A hidrofobicidade dos aerogéis foram evidenciadas pelas medidas do ângulo de contato da superfície dos mesmos com a água, sendo obtidos valores superiores a 120°. A capacidade de adsorção dos aerogéis atingiu 78 g g-1 para o meio homogêneo e 53 g g-1 para o meio heterogêneo. Palavras-chave Aerogéis, celulose, adsorção, petróleo.

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Sorption capacity of hydrophobic cellulose cryogels silanized by two different methods

Cited by 46 publications

References 34 publications

Nanofibrillated cellulose composites and wood derived scaffolds for functional materials

Nanofibrillated cellulose composites and wood derived scaffolds for functional materials

Obtaining Hydrophobic Aerogels of Unbleached Cellulose Nanofibers of the Species Eucalyptus sp. and Pinus elliottii

Caracterização de aerogéis de celulose com adição de metiltrimetoxissilano (MTMS) para adsorção de petróleo

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