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Investigation of Thermal Behavior of Layered Double Hydroxides Intercalated with Carboxymethylcellulose Aiming Bio-Carbon Based Nanocomposites

1
Departamento de Química Fundamental, Instituto de Química, Universidade de São Paulo (USP), Av. Prof. Lineu Prestes 748, São Paulo CEP 05508-000, SP, Brazil
2
Instituto de Ciências Exatas e Tecnologia, Universidade Federal do Amazonas (UFAM), Rua Nossa Senhora do Rosário 3863, Itacoatiara CEP 69103-128, AM, Brazil
*
Author to whom correspondence should be addressed.
ChemEngineering 2019, 3(2), 55; https://doi.org/10.3390/chemengineering3020055
Received: 31 March 2019 / Revised: 17 May 2019 / Accepted: 27 May 2019 / Published: 1 June 2019
(This article belongs to the Special Issue Advanced Applications of Layered Double Hydroxides)
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Abstract

Carboxymethylcellulose (CMC), a polymer derived from biomass, was intercalated into layered double hydroxides (LDH) composed by M2+/Al3+ (M2Al-CMC, M = Mg or Zn) and evaluated as precursors for the preparation of biocarbon-based nanocomposites by pyrolysis. M2Al-CMC hybrids were obtained by coprecipitation and characterized by X ray diffraction (XRD), vibrational spectroscopies, chemical analysis, and thermal analysis coupled to mass spectrometry. Following, pyrolyzed materials obtained between 500–1000 °C were characterized by XRD, Raman spectroscopy, scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). Above 600 °C, Raman spectra of all samples showed the presence of graphitic carbon, which plays a role in the degree of crystallinity of produced inorganic phases (for comparison purposes, M2Al-CO3 materials were investigated after calcination in the same experimental conditions). XRD patterns of Mg2Al-CMC pyrolyzed between 600–1000 °C showed poorly crystallized MgO and absence of spinel reflections, whereas for Zn2Al-CMC, it was observed well crystallized nanometric ZnO at 800 °C, and ZnAl2O4 and γ-Al2O3 phases at 1000 °C. Above 800 °C, the carbothermic reaction was noticed, transforming ZnO to zinc vapour. This study opens perspectives for nanocomposites preparation based on carbon and inorganic (mixed) oxides through precursors having organic-inorganic interactions at the nanoscale domain. View Full-Text
Keywords: intercalation compounds; layered materials; layered double hydroxides; hydrotalcite; thermal analysis; carboxymethylcellulose; carbon-based nanocomposites intercalation compounds; layered materials; layered double hydroxides; hydrotalcite; thermal analysis; carboxymethylcellulose; carbon-based nanocomposites
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Magri, V.R.; Duarte, A.; Perotti, G.F.; Constantino, V.R. Investigation of Thermal Behavior of Layered Double Hydroxides Intercalated with Carboxymethylcellulose Aiming Bio-Carbon Based Nanocomposites. ChemEngineering 2019, 3, 55.

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