Effect of xylanase pretreatment of rice straw unbleached soda and neutral sulfite pulps on isolation of nanofibers and their properties

Hassan, Mohammad L.; Berglund, Linn; Hassan, Enas A.; Abou-Zeid, Ragab E.; Oksman, Kristiina

doi:10.1007/s10570-018-1779-2

Cited by 53 publications

(55 citation statements)

References 52 publications

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“…[18][19][20][21][22] However, due to the recalcitrant nature of the natural cellulosehemicellulose-lignin-complex, the production of nanomaterials directly from biomass can be a more cumbersome process compared to nanoparticles obtained from individual components. Several methods, such as intensive mechanical rening, 21 heat-intensied grinding, 19 and enzymatic treatment 23 have been studied to produce biomass-based nanomaterials, generally termed lignocellulose nanobers or wood nanobers (WNFs). Similar to the production of CNFs and CNCs, the introduction of charged chemical groups into biomass has been shown to improve the disintegration of biomass in its nanosized constituents 20,24,25 due to the generation of steric repulsion and improved swelling (i.e.…”

Section: Introductionmentioning

confidence: 99%

Transparent lignin-containing wood nanofiber films with UV-blocking, oxygen barrier, and anti-microbial properties

et al. 2020

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Section: Introductionmentioning

confidence: 99%

Transparent lignin-containing wood nanofiber films with UV-blocking, oxygen barrier, and anti-microbial properties

et al. 2020

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“…In addition to use of bleached cellulose pulp for cellulosic nanomaterial production, use of less processed natural fibers (e.g., fibers where the lignin, hemicellulose and other materials are not removed) have lately been investigated. (Hassan, Berglund, Hassan, Abou-Zeid, & Oksman, 2018;Herrera et al, 2018;Rojo et al, 2015;Visanko et al, 2017;Winter et al, 2017) For this purpose, carboxylation using (2,2,6,6-Tetramethylpiperidin-1-yl)oxyl (TEMPO) (Okita, Saito, & Isogai, 2009) and nitric acid or a nitric acid-sodium nitrite mixture (Sharma, Joshi, Sharma, & Hsiao, 2017) have been used. However, these methods can simultaneously solubilize non-cellulosic materials (e.g.…”

Section: Introductionmentioning

confidence: 99%

Cationization of lignocellulosic fibers with betaine in deep eutectic solvent: Facile route to charge stabilized cellulose and wood nanofibers

Sirviö

2018

Carbohydrate Polymers

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In this study, a deep eutectic solvent (DES [based on triethylmethylammonium chloride (TEMA) and imidazole]) was used as a reaction medium for cationization of cellulose fibers with trimethylglycine (betaine) hydrochloride in the presence of p-Toluenesulfonyl (tosyl) chloride. Cellulose betaine ester with a cationic charge up to 1.95 mmol/g was obtained at mild reaction conditions (four hours at 80 °C). The reaction was further demonstrated in the fabrication of cationic cellulose nanofibers (CCNFs) by a mild mechanical disintegration of cationized cellulose. In addition to CCNFs, cationic wood nanofibers (CWNFs) were produced directly from groundwood pulp (GWP) with a high lignin content (27 w%). Individualized CCNFs and CWNFs had a fiber diameter of 4.7 ± 2.0 and 3.6 ± 1.3 nm, respectively, whereas some larger fiber aggregates (diameter below 200 nm) were also observed, especially in the case of CWNFs.

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“…During pulping, a small amount of lignin originally present in the lignocellulosic materials is dissolved while the rest is slightly modified and retained within the fibers. In a previous publication 15 , we showed the possibility of isolating RSNF with diameters close to that of elementary fibrils (4-7 nm in width) from unbleached neutral sulfite rice straw pulp with high lignin content by ultrafine grinding. Figure 1 shows TEM images of RSNF isolated from unbleached Membranes prepared from RSNF.…”

Section: Resultsmentioning

confidence: 94%

“…Preparation of rice straw pulp. Unbleached neutral sulfite pulp was prepared as previously described by Hassan et al 15 . In brief, rice straw was treated with an aqueous solution containing 10% sodium sulfite and 2% sodium carbonate aqueous (based on rice straw weight) at 160 °C for 2 h and the liquor ratio was 1:10.…”

Section: Methodsmentioning

confidence: 99%

“…Isolation and characterization of rice straw nanofibers. Rice straw nanofibers (RSNF) from rice straw bleached and unbleached pulps were isolated according to the previously published protocol by Hassan et al 15 . The pulps were first disintegrated by a shear mixer (Silverson L4RT, Silverson Machines Ltd., Chesham, UK) using 2 wt.% consistency pulp suspensions.…”

Section: Methodsmentioning

confidence: 99%

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Water purification ultrafiltration membranes using nanofibers from unbleached and bleached rice straw

Hassan

Fadel

Abou-Zeid

et al. 2020

Sci Rep

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There has been an increasing interest in recent years in isolating cellulose nanofibers from unbleached cellulose pulps for economic, environmental, and functional reasons. In the current work, cellulose nanofibers isolated from high-lignin unbleached neutral sulfite pulp were compared to those isolated from bleached rice straw pulp in making thin-film ultrafiltration membranes by vacuum filtration on hardened filter paper. The prepared membranes were characterized in terms of their microscopic structure, hydrophilicity, pure water flux, protein fouling, and ability to remove lime nanoparticles and purify papermaking wastewater effluent. Using cellulose nanofibers isolated from unbleached pulp facilitated the formation of a thin-film membrane (with a shorter filtration time for thin-film formation) and resulted in higher water flux than that obtained using nanofibers isolated from bleached fibers, without sacrificing its ability to remove the different pollutants. Membranes are used in a wide variety of industries for removing undesirable materials from different media. Among them, those that depend on separation based on the size of materials to be removed, e.g., micro-, ultra-and nano-filtration membranes, are manufactured using different polymers; generating pores within these membranes with targeted size is the key for their use 1. Using cellulose and its derivatives for making membranes for use in micro-and ultrafiltration is well known at the commercial level 2. Cellulosic membranes are usually prepared using casting technique, which depends on the dissolution of cellulosic materials in suitable solvents, followed by film formation by immersion in a non-solvent. This technique requires use of large amounts of solvents; their recovery is important for economic and environmental reasons. Since the emergence of nanocellulosic materials, e.g., cellulose nanofibers and cellulose nanocrystals, increasing research is ongoing regarding their use in the area of membranes. Two approaches have been investigated for use of nanocellulose in that area so far 3. The first approach is through their incorporation in other polymer matrices to improve the performance of prepared membranes. Dissolving the polymers in suitable solvents and also good dispersion of nanocellulosic materials in the polymer solution are necessary before film casting. The second approach studied, which is more favorable and interesting, is to make membranes from a layer of nanocellulose with adequate porosity over other polymeric supports without the need to dissolve the cellulose and to use the film casting technique to generate porosity. The second approach was first introduced by Ma et al. 4 ; it depends on the correlations between pore size distribution of a nonwoven layer structure and bulk porosity. According to this approach, the pore size of a film made from fibers can be adjusted by controlling the fiber diameter. It was also proved through a study of the pore size of films made from electrospun nanofibers that the mean pore size was found t...

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Effect of xylanase pretreatment of rice straw unbleached soda and neutral sulfite pulps on isolation of nanofibers and their properties

Cited by 53 publications

References 52 publications

Transparent lignin-containing wood nanofiber films with UV-blocking, oxygen barrier, and anti-microbial properties

Transparent lignin-containing wood nanofiber films with UV-blocking, oxygen barrier, and anti-microbial properties

Cationization of lignocellulosic fibers with betaine in deep eutectic solvent: Facile route to charge stabilized cellulose and wood nanofibers

Water purification ultrafiltration membranes using nanofibers from unbleached and bleached rice straw

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