Microwave-assisted pretreatment of eucalyptus waste to obtain cellulose fibers

Camani, Paulo H.; Anholon, Beatriz F.; Toder, Rick R.; Rosa, Derval dos Santos

doi:10.1007/s10570-020-03019-7

Cited by 32 publications

(7 citation statements)

References 35 publications

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“…Sawdust from eucalyptus wood provides a biosorbent for removing textile dyes such as methylene blue (Cemin et al 2021 ), and its pulp, cellulose nanofibrils (Camani et al 2020 ; Demuner et al 2020 ; Siqueira et al 2019 ) (Fig. 6 ).…”

Section: Resultsmentioning

confidence: 99%

Brazilian Agro-industrial Wastes as Potential Textile and Other Raw Materials: a Sustainable Approach

et al. 2022

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The Brazilian agro-industrial chain generates about 291 million/tons/year of wastes, which, if inadequately destinated, could originate social and environmental risks. There is a growing need for the use of alternative raw materials to replace that originated from fossil resources in the Brazilian industry. Renewable materials play an important role on the sustainability of ecosystems and materials’ circularity. The issue has acquired importance in light of recent bio-based agro-fiber development potential applications. Considering sustainability guidelines, this study aimed to analyze the main Brazilian agro-industrial waste crops (temporary and permanent) as important sources of natural fibers and other raw materials. A systematic review of the literature (SRL) about Brazilian researches, based on concepts of industrial ecology, and the creation of a bibliometric analysis network were carried out. The agricultural biomass related to the main crops presents characteristics making them suitable to be applied for textiles, as natural fibers and polymers, in biosorbents for industrial effluents, and cellulose obtention and reinforcement material in composites. Thus, scientific investment in researches on materials and technology development are necessary to provide applications that could meet current and future demands and expand the scope of new materials for sustainability.

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Section: Resultsmentioning

confidence: 99%

Brazilian Agro-industrial Wastes as Potential Textile and Other Raw Materials: a Sustainable Approach

et al. 2022

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“…The results also show that the T αc of PVA and ZnO_PVA samples are not affected by the irradiation time (under the same irradiation power). A hypothesis to explain this behavior is that the energy provided by microwaves promotes changes in the crystalline organization because the energy is sufficient to promote a crystallite rearrangement caused by hotspot points that appear upon irradiation . Endothermic peaks related to the melting temperatures ( T m ) are found between 174.5 and 191.5 °C.…”

Section: Resultsmentioning

confidence: 99%

“…A hypothesis to explain this behavior is that the energy provided by microwaves promotes changes in the crystalline organization because the energy is sufficient to promote a crystallite rearrangement caused by hotspot points that appear upon irradiation. 56 Endothermic peaks related to the melting temperatures (T m ) are found between 174.5 and 191.5 °C. It is possible to observe that an increase in irradiation power tends to increase the melting temperatures.…”

Section: Thermal Characterizationmentioning

confidence: 99%

ZnO Nanoparticle/Poly(vinyl alcohol) Nanocomposites via Microwave-Assisted Sol–Gel Synthesis for Structural Materials, UV Shielding, and Antimicrobial Activity

Factori

Amaral

Camani

et al. 2021

ACS Appl. Nano Mater.

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Polymer nanocomposites based on poly(vinyl alcohol) (PVA) and ZnO hold a privileged position in the development of organic/inorganic hybrid multifunctional materials for applications ranging from food packing to biotechnological platforms. However, a remarkable drawback is that most of the currently available synthetic routes are based on approaches that are both time-and energy-consuming and often lead to heterogeneous polymer films that require compatibilizers to disperse inorganic nanoparticles into the organic matrix. In this work, we present a route for synthesizing ZnO_PVA nanocomposite films through a sol−gel strategy that uses microwaves as a heat source and PVA as a reactant. We show that nanocomposites produced using this approach exhibit enhanced mechanical properties, UV shielding capabilities, and antimicrobial activity and potentialize their application in the production of antibacterial films against Gram-positive and Gram-negative strains. We show that these properties are easily modulated by controlling the synthesis parameters, such as the irradiation time and power, and the use of PVA excludes the need for compatibilizers since it simultaneously behaves as the polymer matrix and a mediator for in situ synthesis of nanostructured ZnO clusters. The method presented here is straightforward, inexpensive, and applied to other polyols to enhance the functionalities of materials based on these compounds.

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“…Chemical treatments for hemicellulose and lignin removal followed the method developed by Camani and collaborators. [ 15 ] Briefly, a mercerization process was conducted with sodium hydroxide (NaOH – 2.5 M v/v), purchased by Casa Americana] for 30 min, followed by bleaching with hydrogen peroxide solution (H 2 O 2 – 16% v/v), purchased by Casa Americana], for 2 h at 100 °C by microwave‐assisted methodology. Then, the fibers were subjected to acid hydrolysis with sulfuric acid ([H 2 SO 4 ], purchased by Synth) at 45% w/w for 1 h at 45 °C, with a solution/fiber ratio of 20 mL:1g.…”

Section: Methodsmentioning

confidence: 99%

Electrostatic or Steric Stabilization of the Cellulose Nanostructures Using Different Modifying Agents

Camani

Souza

Rosa

2020

Macromolecular Symposia

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Cellulose nanostructures (CNSs) are nanoscale biomaterials that have an excellent reinforcing ability; however, due to their high hydrophilic nature, its functionalization is necessary to improve the compatibility between CNS and polymeric matrices. In this work, the CNS‐functionalization with four different modifiers: cationic (CS), anionic (AS), and non‐ionic (NS) surfactant, and GA (grafting agent) is proposed. The modification is conducted in aqueous solution, using three different modifiers contents: 1, 3, and 5 wt%. The modified‐CNS are characterized by Fourier transform infrared spectroscopy (FTIR), X‐ray photoelectron spectroscopy (XPS), zeta potential (ζ), dynamic light scattering (DLS), and thermogravimetric analysis (TGA). CS and AS modifiers acted as electrostatic stabilizers, through charges present in its functional groups (NH3+ and SO3−, respectively); in this case, ζ and XPS results investigated the stabilization. NS and GA modifiers acted as steric stabilizers, due to their polymeric chains, which induces the repulsion between the CNS; the stabilization is confirmed mainly by DLS and XPS. Regarding thermal stability, modified‐CNS samples showed a slight decrease in thermal properties due to the presence of reactive groups in the modifiers. All the samples showed the potential to be applied as fillers in nanocomposites, with degradation temperatures above the biopolymers processing temperatures.

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Microwave-assisted pretreatment of eucalyptus waste to obtain cellulose fibers

Cited by 32 publications

References 35 publications

Brazilian Agro-industrial Wastes as Potential Textile and Other Raw Materials: a Sustainable Approach

Brazilian Agro-industrial Wastes as Potential Textile and Other Raw Materials: a Sustainable Approach

ZnO Nanoparticle/Poly(vinyl alcohol) Nanocomposites via Microwave-Assisted Sol–Gel Synthesis for Structural Materials, UV Shielding, and Antimicrobial Activity

Electrostatic or Steric Stabilization of the Cellulose Nanostructures Using Different Modifying Agents

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