Synthesis of Spherical Bacterial Nanocellulose as a Potential Silver Adsorption Agent for Antimicrobial Purposes

Cesca, Karina; Netto, Matias Schadeck; Ely, Valessa Lunkes; Dotto, Guilherme Luiz; Foletto, Edson Luiz; Hotza, Dachamir

doi:10.35812/cellulosechemtechnol.2020.54.30

Cited by 11 publications

(4 citation statements)

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“…[55] In the raw material, the region around 2 theta ¼ 14 shows a small peak, which may be related to crystalline cellulose presence. [56] This region is completely amorphized after chemical treatment. This change in the material's organization is directly related to the hydrolysis process and the substitution of functional groups.…”

Section: Characterization Resultsmentioning

confidence: 99%

One step acid modification of the residual bark from Campomanesia guazumifolia using H₂SO₄ and application in the removal of 2,4-dichlorophenoxyacetic from aqueous solution

Bevilacqua

Preigschadt

Netto

et al. 2021

Journal of Environmental Science and Health, Part B

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The residual bark of the tree species Campomanesia guazumifolia was successfully modified with H 2 SO 4 and applied to remove the toxic herbicide 2.4-dichlorophenoxyacetic (2.4-D) from aqueous solutions. The characterization techniques made it possible to observe that the material maintained its amorphous structure; however, a new FTIR band emerged, indicating the interaction of the lignocellulosic matrix with sulfuric acid. Micrographs showed that the material maintained its irregular shape; however, new spaces and cavities appeared after the acidic modification. Regardless of the herbicide concentration, the system tended to equilibrium after 120 min. Using the best statistical coefficients, the Elovich model was the one that best fitted the kinetic data. The temperature increase in the system negatively influenced the adsorption of 2.4-D, reaching a maximum capacity of 312.81 mg g À1 at 298 K. The equilibrium curves showed a better fit to the T oth model. Thermodynamic parameters confirmed the exothermic nature of the system (DH 0 ¼ À59.86 kJ mol À1 ). As a residue obtained from urban pruning, the bark of Campomanesia guazumifolia treated with sulfuric acid is a promising and highly efficient alternative for removing the widely used and toxic 2.4-D herbicide from aqueous solutions.

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Section: Characterization Resultsmentioning

confidence: 99%

One step acid modification of the residual bark from Campomanesia guazumifolia using H₂SO₄ and application in the removal of 2,4-dichlorophenoxyacetic from aqueous solution

Bevilacqua

Preigschadt

Netto

et al. 2021

Journal of Environmental Science and Health, Part B

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“…Bacterial nanocellulose (BNC) thick membranes were synthesized by the bacteria Gluconacetobacter xylinus, following the procedure described in [37]. Briefly, the bacteria were grown inside a Falcon tube for several days until the hydrated nanocellulose layer had reached 1 cm in height.…”

Section: Samples Preparation and Functionalizationmentioning

confidence: 99%

“…Briefly, the bacteria were grown inside a Falcon tube for several days until the hydrated nanocellulose layer had reached 1 cm in height. Next, the bacteria were removed from the formed 3D structure using NaOH (100 mM) at 50 °C for 24 h, and the cellulose was rinsed with distilled water [37]. e nanocellulose hydrogel passed through a solvent exchange, from water to ethanol, consisting of 5 progressive exchanges over two days.…”

Section: Samples Preparation and Functionalizationmentioning

confidence: 99%

Functionalization of Carbon Electrodes with Nanotitania by Atomic Layer Deposition

Souza

Hotza

Janßen

et al. 2022

Advances in Materials Science and Engineering

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Carbon fibers are materials with a very high surface area and are interesting for applications such as filters, fire-resistant heat insulation, photocatalysis, and capacitor electrodes. Moreover, thermal burnout can easily remove these fibers, making them ideal templates for high-precision coatings or keeping them within the coated structure, generating nanostructured composites. In this work, two different substrates, carbon felt and bacterial nanocellulose were coated by TiO2 with atomic layer deposition (ALD). After deposition, the templates were pyrolyzed or further removed by burnout in the air. The microstructure evolution of the 3D interlocked-fibers structures was characterized by scanning electron microscopy and nitrogen adsorption surface area after each step. Stable anatase was present as a single TiO2 phase even after heat treatment at 800°C. Moreover, electrochemical impedance spectroscopy and constant current charge-discharge were employed to investigate the electrochemical properties of the samples. Our results show that all samples display a uniform layer after ALD and that the surface area decreases with an increasing number of ALD cycles. After burnout, the 3D structures presented a straw-like appearance to the shells. Nonetheless, both samples presented a power density comparable to a porous NiO/C, with the pyrolyzed bacterial nanocellulose sample displaying a higher pseudocapacitance performance than the carbon-felt samples.

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“…In addition, they can facilitate cell colonization, with specific functional properties that enhance cell binding, proliferation, migration, and expression, among others [5][6][7]. Therefore, the materials used in the scaffolds' production must provide adequate mechanical properties, porosity, interconnectivity, and biocompatibility [8][9][10][11]. Most of the approaches to the production of scaffolds involve adding the growth factors and/or bioresorbable bioceramics, which allow a controlled cell differentiation and improved osteoconductivity [12][13][14][15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Chitosan/β-TCP composites scaffolds coated with silk fibroin: a bone tissue engineering approach

Piaia¹,

Silva²,

Gomes³

et al. 2021

Biomed. Mater.

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Bone regeneration and natural repair are long-standing processes that can lead to uneven new tissue growth. By introducing scaffolds that can be autografts and/or allografts, tissue engineering provides new approaches to manage the major burdens involved in this process. Polymeric scaffolds allow the incorporation of bioactive agents that improve their biological and mechanical performance, making them suitable materials for bone regeneration solutions. The present work aimed to create chitosan/beta-tricalcium phosphate-based scaffolds coated with silk fibroin and evaluate their potential for bone tissue engineering. Results showed that the obtained scaffolds have porosities up to 86%, interconnectivity up to 96%, pore sizes in the range of 60–170 μm, and a stiffness ranging from 1 to 2 MPa. Furthermore, when cultured with MC3T3 cells, the scaffolds were able to form apatite crystals after 21 d; and they were able to support cell growth and proliferation up to 14 d of culture. Besides, cellular proliferation was higher on the scaffolds coated with silk. These outcomes further demonstrate that the developed structures are suitable candidates to enhance bone tissue engineering.

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Synthesis of Spherical Bacterial Nanocellulose as a Potential Silver Adsorption Agent for Antimicrobial Purposes

Cited by 11 publications

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One step acid modification of the residual bark from Campomanesia guazumifolia using H₂SO₄ and application in the removal of 2,4-dichlorophenoxyacetic from aqueous solution

One step acid modification of the residual bark from Campomanesia guazumifolia using H₂SO₄ and application in the removal of 2,4-dichlorophenoxyacetic from aqueous solution

Functionalization of Carbon Electrodes with Nanotitania by Atomic Layer Deposition

Chitosan/β-TCP composites scaffolds coated with silk fibroin: a bone tissue engineering approach

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Synthesis of Spherical Bacterial Nanocellulose as a Potential Silver Adsorption Agent for Antimicrobial Purposes

Cited by 11 publications

References 0 publications

One step acid modification of the residual bark from Campomanesia guazumifolia using H2SO4 and application in the removal of 2,4-dichlorophenoxyacetic from aqueous solution

One step acid modification of the residual bark from Campomanesia guazumifolia using H2SO4 and application in the removal of 2,4-dichlorophenoxyacetic from aqueous solution

Functionalization of Carbon Electrodes with Nanotitania by Atomic Layer Deposition

Chitosan/β-TCP composites scaffolds coated with silk fibroin: a bone tissue engineering approach

Contact Info

Product

Resources

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One step acid modification of the residual bark from Campomanesia guazumifolia using H₂SO₄ and application in the removal of 2,4-dichlorophenoxyacetic from aqueous solution

One step acid modification of the residual bark from Campomanesia guazumifolia using H₂SO₄ and application in the removal of 2,4-dichlorophenoxyacetic from aqueous solution