Cellulose Based Cryogels as Adsorbents for Organic Pollutants

Toledo, Paulo V. O.; Martins, Bianca F.; Pirich, Cleverton Luiz; Sierakowski, Maria Rita; Neto, Érico Teixeira; Petri, Denise Freitas Siqueira

doi:10.1002/masy.201800013

Cited by 19 publications

(5 citation statements)

References 45 publications

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“…The addition of 5% biochar to a cellulose cryogel yielded the highest sorption capacity, at 73 g/g of petroleum [116]. Cryogels formed from hydroxypropyl methylcellulose (HPMC) and bacterial cellulose nanocrystals (CNC) have shown good adsorption of organic pollutants [117]. Shapable cellulose nanofiber/alginate cryogels with underwater super-elasticity have been used for protein purification [118].…”

Section: Cellulose-based Cryogels and Their Applications In Biomedicinementioning

confidence: 99%

Cellulose Cryogels as Promising Materials for Biomedical Applications

Tyshkunova

Poshina

Skorik

2022

IJMS

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The availability, biocompatibility, non-toxicity, and ease of chemical modification make cellulose a promising natural polymer for the production of biomedical materials. Cryogelation is a relatively new and straightforward technique for producing porous light and super-macroporous cellulose materials. The production stages include dissolution of cellulose in an appropriate solvent, regeneration (coagulation) from the solution, removal of the excessive solvent, and then freezing. Subsequent freeze-drying preserves the micro- and nanostructures of the material formed during the regeneration and freezing steps. Various factors can affect the structure and properties of cellulose cryogels, including the cellulose origin, the dissolution parameters, the solvent type, and the temperature and rate of freezing, as well as the inclusion of different fillers. Adjustment of these parameters can change the morphology and properties of cellulose cryogels to impart the desired characteristics. This review discusses the structure of cellulose and its properties as a biomaterial, the strategies for cellulose dissolution, and the factors affecting the structure and properties of the formed cryogels. We focus on the advantages of the freeze-drying process, highlighting recent studies on the production and application of cellulose cryogels in biomedicine and the main cryogel quality characteristics. Finally, conclusions and prospects are presented regarding the application of cellulose cryogels in wound healing, in the regeneration of various tissues (e.g., damaged cartilage, bone tissue, and nerves), and in controlled-release drug delivery.

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Section: Cellulose-based Cryogels and Their Applications In Biomedicinementioning

confidence: 99%

Cellulose Cryogels as Promising Materials for Biomedical Applications

Tyshkunova

Poshina

Skorik

2022

IJMS

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“…The activation energy (E a : kJ mol −1 ) of MB adsorption on the prepared cryogel could be estimated as lnk 2 = lnk 0 -Ea RT (18) where k 0 is a factor independent of temperature. In general, the sorption process is classified as physical adsorption when E a < 40 kJ mol −1 [29,35], film-diffusion controlled if E a < 16 kJ mol −1 , particle-diffusion controlled if E a is 16-40 kJ mol −1 [55], and chemical adsorption when E a > 40 kJ mol −1 [29,35].…”

Section: Adsorption Thermodynamicsmentioning

confidence: 99%

“…Several studies have also been investigated to modify and convert conventional textile fibers to be adsorbents for dye removal, e.g., polypropylene [14,15], synthetic fiber [16], and chitosan polymer-coated cotton fibers [17]. Among them, cryogels derived from natural polymers, such as hydroxypropyl methylcellulose and bacterial cellulose nanocrystals [18] and alginate quasi-cryogels combined with clay [6,19] or graphene oxide [20], have attracted great interest because of their low environmental impact, fast response, and high efficiency.…”

Section: Introductionmentioning

confidence: 99%

Starch Biocryogel for Removal of Methylene Blue by Batch Adsorption

et al. 2022

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A green monolithic starch cryogel was prepared and applied for the removal of methylene blue (MB) using a batch system. The influence of various experimental parameters on MB adsorption was investigated. High removal efficiency (81.58 ± 0.59%) and adsorption capacity (34.84 mg g−1) were achieved. The Langmuir model better fitted the experimental data (determination coefficient (R2) = 0.9838) than the Freundlich one (R2 = 0.8542), while the kinetics of MB adsorption on the cryogel followed a pseudo-second-order model. The adsorption process was spontaneous and endothermic with an activation energy of 37.8 kJ mol−1 that indicated physical adsorption. The starch cryogel was used for MB removal from a wastewater sample collected from a local Batik production community enterprise in Phuket, Thailand, and a removal efficiency of 75.6% was achieved, indicating that it has a high potential as a green adsorbent for MB removal.

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“…Cellulose is the most available biopolymer on earth and is used in countless applications. In the context of material science, small contents of cellulose have been demonstrated to improve the structure of cryogels, providing better mechanical properties and performance 28,29 . The addition of 2 wt% of cellulose, for instance, reinforces the mechanical properties of polyimide/CNC hybrid aero-gels significantly 30 .…”

Section: Openmentioning

confidence: 99%

Biomaterial-based sponge for efficient and environmentally sound removal of bacteria from water

You,

Lorente,

Marlina

et al. 2024

Sci Rep

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Designing materials capable of disinfecting water without releasing harmful by-products is an ongoing challenge. Here, we report a novel polycationic sponge material synthesized from chitosan derivatives and cellulose fibers, exhibiting antibacterial properties. The design of such material is based on three key principles. First, the formation of a highly porous structure through cryogelation for an extensive surface area. Second, the incorporation of cationic quaternary ammonium moieties onto chitosan to enhance bacterial adsorption and antibacterial activity. Lastly, the reinforcement of mechanical properties through integration of cellulose fibers. The presented sponge materials exhibit up to a 4-log (99.99%) reduction within 6 h against both gram-positive B. subtilis and gram-negative E. coli. Notably, QCHI90/Cell, with the highest surface charge, exhibits a 2–4.5 log reduction within 1 h of incubation time. The eco-friendly synthesis from water and readily available biomaterials, along with cost-effectiveness and simplicity, underscores its versatility and feasibility of upscaling. Together with its outstanding antibacterial activity, this macroporous biomaterial emerges as a promising candidate for water disinfection applications.

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Cellulose Based Cryogels as Adsorbents for Organic Pollutants

Cited by 19 publications

References 45 publications

Cellulose Cryogels as Promising Materials for Biomedical Applications

Cellulose Cryogels as Promising Materials for Biomedical Applications

Starch Biocryogel for Removal of Methylene Blue by Batch Adsorption

Biomaterial-based sponge for efficient and environmentally sound removal of bacteria from water

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