Effect of the counter-ion on nanocellulose hydrogels and their superabsorbent structure and properties

Barajas‐Ledesma, Ruth M.; Hossain, Laila; Wong, Vanessa Nl; Patti, Antonio F.; Garnier, Gil

doi:10.1016/j.jcis.2021.04.065

Cited by 36 publications

(15 citation statements)

References 44 publications

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“…In addition, the effective CEC of the CL soil is dominated by the Ca 2+ ions, known to impact the swelling capacity of superabsorbents. 43 Analysis of the total water required data revealed that the effect of SM induced a higher response than the effect of treatment in both soils, where the water required significantly decreased with decreasing SM. Differences in water requirement are correlated to the plant growth 44 which can be affected by water deficiency.…”

Section: ■ Discussionmentioning

confidence: 92%

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Biodegradation of a Nanocellulose Superabsorbent and Its Effect on the Growth of Spinach (Spinacea oleracea)

Barajas‐Ledesma

Stocker

Wong

et al. 2021

ACS Agric. Sci. Technol.

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In this study, spinach (Spinacea oleracea) plants were grown in two soils, a clay loam (CL) and a sandy (SD) soil, amended with two types of superabsorbent polymers (SAPs), nanocellulose and commercial, at different levels of soil moisture: 70, 40, and 20%. The effect of the superabsorbent on the soil properties, water management, and plant biomass was measured and compared to that in soils treated with a commercial anionic polyacrylamide-based SAP. Plant biomass is the highest in SD soil amended with a commercial superabsorbent. However, it decreases in the CL soil when a superabsorbent is applied, independent of the SAP type. This effect is magnified when a nanocellulose SAP is used; this is likely attributed to waterlogging stress and the fast biodegradation of this superabsorbent, where approximately 50% of the initial mass remains after 5 days of exposure. The use of a nanocellulose SAP as a water retention agent offers the potential for a much-needed sustainable solution for global agriculture. Future studies are needed to modify the structure of the nanocellulose SAP to inhibit its biodegradation and increase its benefits for agricultural use.

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Section: ■ Discussionmentioning

confidence: 92%

“…The effective CEC in the CL soil is higher than that for the SD soil, being 18 and 2.6 cmol + /Kg, respectively. In addition, the effective CEC of the CL soil is dominated by the Ca 2+ ions, known to impact the swelling capacity of superabsorbents …”

Section: Discussionmentioning

confidence: 99%

Biodegradation of a Nanocellulose Superabsorbent and Its Effect on the Growth of Spinach (Spinacea oleracea)

Barajas‐Ledesma

Stocker

Wong

et al. 2021

ACS Agric. Sci. Technol.

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“…This result agrees with the FSC reported previously on TEMPO-oxidized CNF foams. 41,42 Interestingly, the graft polymerization of AA from CNFs resulted in a significant increase in water absorption capacity, exhibiting FSC values of 156 and 242 g/g at 0.1 and 0.25 equiv of Ag(I). These results corroborate the results of Song et al 43 where an FSC of 240 g/g was measured from hydroxyethyl cellulose grafted with P(AA-coacrylamide).…”

Section: ■ Resultsmentioning

confidence: 99%

“…The water absorption of PAA-g-CNFs was also investigated as shown in Figure . Pristine TOCNF has been widely reported as a potential green superabsorbent owing to the highly negatively charged carboxylate groups which interact with water molecules. , The graft polymerization of AA from CNFs significantly improved its FSC by five-fold, primarily due to the increase in carboxylate content. However, this is also highly affected by the concentration of Ag(I) in the polymerization reaction.…”

Section: Discussionmentioning

confidence: 99%

Synthesis of Superabsorbent Polyacrylic Acid-Grafted Cellulose Nanofibers via Silver-Promoted Decarboxylative Radical Polymerization

et al. 2023

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Graft polymerization has been widely used to produce new cellulosic nanomaterials with unique and smart properties. Silver-promoted decarboxylative polymerization is a novel and green method to polymerize vinyl monomers from the surface of carboxylated nanocellulose. Here, we report a new family of polyacrylic acid-grafted cellulose nanofibers (PAA-g-CNFs) synthesized using this polymerization method. The polymerization of acrylic acid (AA) monomers is surface-initiated by the oxidative decarboxylation of TEMPO-oxidized CNFs in the presence of persulfate and catalytic silver(I). This reaction also promotes polymer branching as the carboxylic acid groups from acrylic acid can undergo further decarboxylation, introducing a high density of sites for branching and polymer propagation. Small-molecule model experiments, Fourier transform infrared spectroscopy, and thermogravimetric analysis showed the successful grafting of PAA from CNFs. 1H NMR analysis also showed that the polymerization of AA from CNFs is rapid and is completed at 4 h, along with the formation of ungrafted PAA. Results reveal that the Ag(I) concentration in the reaction affects the chemical and water-retention properties of PAA-g-CNFs. The carboxylate content of PAA-g-CNFs increases with Ag(I) concentration due to the increase of initiation sites for polymer propagation. Small-angle neutron scattering, along with dynamic light scattering and surface charge analyses, reveals that polymerization reactions with low Ag(I) catalyst concentrations (0.1–0.25 equiv) form more linear and open structures, while those with high Ag(I) concentrations (>0.25 equiv) form hyperbranched and compact structures. The differences in the architecture of PAA grafted from CNFs directly affect the water-retention properties. PAA-g-CNFs with lower levels of branching (low Ag polymerization) display excellent water-retention properties, while PAA-g-CNFs with a hyperbranched and compact structure (high Ag polymerization) can poorly hold water. Ultimately, this study validates a novel approach to graft PAA from CNFs and demonstrates that the Ag(I) catalyst loading can modulate the degree of branching, leading to new superabsorbent polymers for a wide range of applications.

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“… 19–21 It is environmentally friendly, non-toxic and biodegradable as a supporting substrate material. Therefore, many prepared cellulose composites such as Pickering emulsions, 22 cellulose composite membranes, 23 functionalized nanocrystals, 24 cellulose fibers and fabrics, 25,26 hydrogels and aerogels 27–29 have been reported. Cellulose gel is a three-dimensional mesh structure material, which has a high specific surface area, 30 and abundant active sites that could increase the contact opportunity between contaminants and catalysts, and the pores in the structure also facilitated the mass transport of reactants and products.…”

Section: Introductionmentioning

confidence: 99%

In situ growth of CuS NPs on 3D porous cellulose macrospheres as recyclable biocatalysts for organic dye degradation

Sun

Zhong

et al. 2021

RSC Adv.

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Effect of the counter-ion on nanocellulose hydrogels and their superabsorbent structure and properties

Cited by 36 publications

References 44 publications

Biodegradation of a Nanocellulose Superabsorbent and Its Effect on the Growth of Spinach (Spinacea oleracea)

Biodegradation of a Nanocellulose Superabsorbent and Its Effect on the Growth of Spinach (Spinacea oleracea)

Synthesis of Superabsorbent Polyacrylic Acid-Grafted Cellulose Nanofibers via Silver-Promoted Decarboxylative Radical Polymerization

In situ growth of CuS NPs on 3D porous cellulose macrospheres as recyclable biocatalysts for organic dye degradation

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