Surface Modification of Cured Inorganic Foams with Cationic Cellulose Nanocrystals and Their Use as Reactive Filter Media for Anionic Dye Removal

Selkälä, Tuula; Suopajärvi, Terhi; Sirviö, Juho Antti; Kinnunen, Päivö; Carvalho, Ana Luiza Coelho Braga de

doi:10.1021/acsami.0c05927

Cited by 34 publications

(13 citation statements)

References 75 publications

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“…The oxygen tetrahedra containing the Al 3+ ions has a negative charge, which is balanced by cations such as Na + [38], and this explains the negative zeta potential. The results shown in Figure 2 are in line with previous studies on the topic [39,40].…”

Section: Propertysupporting

confidence: 91%

Unravelling the Affinity of Alkali-Activated Fly Ash Cubic Foams towards Heavy Metals Sorption

et al. 2022

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In this work, alkali-activated fly ash-derived foams were produced at room temperature by direct foaming using aluminum powder. The 1 cm3 foams (cubes) were then evaluated as adsorbents to extract heavy metals from aqueous solutions. The foams’ selectivity towards lead, cadmium, zinc, and copper ions was evaluated in single, binary, and multicomponent ionic solutions. In the single ion assays, the foams showed much higher affinity towards lead, compared to the other heavy metals; at 10 ppm, the removal efficiency reached 91.9% for lead, 83.2% for cadmium, 74.6% for copper, and 64.6% for zinc. The greater selectivity for lead was also seen in the binary tests. The results showed that the presence of zinc is detrimental to cadmium and copper sorption, while for lead it mainly affects the sorption rate, but not the ultimate removal efficiency. In the multicomponent assays, the removal efficiency for all the heavy metals was lower than the values seen in the single ion tests. However, the superior affinity for lead was preserved. This study decreases the existing knowledge gap regarding the potential of alkali-activated materials to act as heavy metals adsorbents under different scenarios.

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Section: Propertysupporting

confidence: 91%

Unravelling the Affinity of Alkali-Activated Fly Ash Cubic Foams towards Heavy Metals Sorption

et al. 2022

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“…In contrast, quaternary ammonium compounds (QACs) 193 are positively charged over a wide pH range, e.g., 3−8, and are, therefore, more attractive for cationic functionalization. QACs reported in the literature for functionalization of nanocellulose include Girard's reagent T ((2-hydrazinyl-2-oxoethyl)trimethylazanium chloride), 194,195 epoxy-propyltrimethylammonium chloride (EPTMAC), 196,197 glycidyltrimethylammonium chloride, 186,189,190,198 imidazolium, 199 aminoguanidine, 200,201 pyridinium, 202 and a deep eutectic solvents made from aminoguanidine hydrochloride and glycerol 203 or boric acid and glycidyl trimethylammonium chloride. 204 In water treatment applications, cationic nanocellulose is attractive because it offers ease of adsorbent recovery after adsorption.…”

Section: Cationizationmentioning

confidence: 99%

Cellulose: A Review of Water Interactions, Applications in Composites, and Water Treatment

et al. 2023

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Cellulose is known to interact well with water, but is insoluble in it. Many polysaccharides such as cellulose are known to have significant hydrogen bond networks joining the molecular chains, and yet they are recalcitrant to aqueous solvents. This review charts the interaction of cellulose with water but with emphasis on the formation of both natural and synthetic fiber composites. Covering studies concerning the interaction of water with wood, the biosynthesis of cellulose in the cell wall, to its dispersion in aqueous suspensions and ultimately in water filtration and fiber-based composite materials this review explores water−cellulose interactions and how they can be exploited for synthetic and natural composites. The suggestion that cellulose is amphiphilic is critically reviewed, with relevance to its processing. Building on this, progress made in using various charged and modified forms of nanocellulose to stabilize oil−water emulsions is addressed. The role of water in the aqueous formation of chiral nematic liquid crystals, and subsequently when dried into composite films is covered. The review will also address the use of cellulose as an aid to water filtration as one area where interactions can be used effectively to prosper human life.

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“…Recently, DESs have also been studied for pretreatment and modification of cellulose (Sirviö et al 2015;Li et al 2017;Selkälä et al 2020). Sirviö et al (2015) used DES of choline chloride-urea (molar ratio of 1:2) to promote nanofibrillation of birch pulp.…”

Section: Introductionmentioning

confidence: 99%

Hydrophobic modification of nanocellulose and all-cellulose composite films using deep eutectic solvent as a reaction medium

et al. 2021

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In this work, deep eutectic solvent (DES) based on imidazole and triethylmethylammonium chloride was used as a reaction medium for the esterification of cellulose nanofiber (CNF) and all-cellulose composite (ACC) films with n-octylsuccinic anhydride (OSA) to obtain high strength and sustainable films with increased hydrophobicity. Diffuse reflectance infrared Fourier transform spectroscopy and X-ray photoelectron spectroscopy were used to prove the success of the modification. The mechanical strength of the modified films was analyzed in dry, humid, and wet conditions, and the hydrophobicity of the films was indicated in terms of contact angle measurements. In addition, water absorption and transparency of the films were characterized. The modification was proven to be simple and fast, and mild conditions of 80 °C reaction temperature and 1 h reaction time were used. DES/OSA- modified CNF film exhibited better mechanical properties in dry, humid, and wet conditions compared to reference CNF film, and DES/OSA-modified ACC film displayed notable higher mechanical properties in wet state compared to that of reference CNF film (31 MPa tensile strength and 6.1% strain at break vs. 18 MPa and 2.2%, respectively). These improvements were partly attributed to higher contact angles of modified films (ACC-DES/OSA 60° and CNF-DES/OSA 51°) compared to CNF film (37°). Graphic abstract

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Surface Modification of Cured Inorganic Foams with Cationic Cellulose Nanocrystals and Their Use as Reactive Filter Media for Anionic Dye Removal

Cited by 34 publications

References 75 publications

Unravelling the Affinity of Alkali-Activated Fly Ash Cubic Foams towards Heavy Metals Sorption

Unravelling the Affinity of Alkali-Activated Fly Ash Cubic Foams towards Heavy Metals Sorption

Cellulose: A Review of Water Interactions, Applications in Composites, and Water Treatment

Hydrophobic modification of nanocellulose and all-cellulose composite films using deep eutectic solvent as a reaction medium

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