Cellulose biotemplates for layered double hydroxides networks

Topochemical engineering is a method of designing the fractionation (disassembly) and fabrication (assembly) of highly engineered functional materials using a combination of molecular and supramolecular techniques. Cellulose is one of the naturally occurring biopolymers, currently considered to be an important raw material for the design and development of sustainable products and processes. This feature article deals with new insights into how cellulose can be processed and functionalized using topochemical engineering in order to create functional fibers, enhance biopolymer dissolution in water-based solvents, and control the shaping of porous materials. Subsequently, topochemical engineering of cellulose offers a variety of morphological structures such as highly engineered fibers, functional cellulose beads, and reactive powders that find relevant applications in pulp bleaching, enzyme and antimicrobial drug carriers, ion exchange resins, photoluminescent materials, waterproof materials, fluorescent materials, flame retardants, and template materials for inorganic synthesis. The topochemical engineering of biopolymers and biohybrids is an exciting and emerging area of research that can boost the design of new bioproducts with novel functionalities and technological advancements for biobased industries.

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“… Schematic synthesis of LDH networks using cellulose biotemplates. Reprinted from ref ( 120 ) with permission from Elsevier. …”

Section: Cellulose As a Biotemplate For The Topochemical Engineering mentioning

confidence: 99%

Topochemical Engineering of Cellulose-Based Functional Materials

2018

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“…1 shows the FTIR spectra of the thermal degradation residue of F and F1 heated at 300 C and 500 C, respectively. Cellulose degrades at 300 C. 33,34 The characteristic peak of -OH at 3000 cm À1 to 3700 cm À1 weakened with the heating temperature, which proved that the hydroxyl group of calcium hydroxide, -O À Ca 2+ -OH, and cellulose of hemp decreased with heating. The characteristic peaks of CaCO 3 were observed at 1400 cm À1 and 873 cm À1 for 300F1 compared with that of 300F.…”

Section: Resultsmentioning

confidence: 91%

In situ inorganic flame retardant modified hemp and its polypropylene composites

Zhao

Zhang

et al. 2017

RSC Adv.

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“…O ombro entre 2900 e 3042 cm -1 é atribuído à ligação de hidrogênio entre H 2 O e o ânion carbonato (CO 3 -H 2 O). 31,[34][35][36] A curva TG do material 5:1 MgAlGa50% é mostrada como um exemplo na Figura 5 com indicações dos pontos obtidos por DTG usados na determinação percentual de perda de massa no estudo de degradação térmica. O padrão de decomposição térmica dos HDLs é fortemente dependente da composição do material e do tipo de ânion incorporado no espaço interlamelar.…”

Section: Caracterização Estrutural Dos Hdls E De Seus Ompsunclassified

Óxidos metálicos derivados de materiais tipo hidrotalcitas contendo Ga3+ como catalisadores para síntese de biodiesel etílico

Mancini¹,

Perrone²,

Thoméo³

et al. 2017

Quim. Nova

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.4H 2 O in different ratios Mg 2+ /M 3+ where M 3+ is Al 3+ , Ga 3+ or both was carried out by the coprecipitation method to be applied in the transesterification reactions for synthesis of ethyl biodiesel from soybean oil and ethanol. The reactions were processed for 12 hours at 120 °C at a molar ratio oil/ethanol (1/20) with 20% (m/m) of the catalyst in relation to the oil mass, and the products were quantified by GC-FID. With the introduction of Ga 3+ in the solid, some physicochemical characteristics of LDHs were kept based in the data from X-ray pattern diffraction (XRD), vibrational spectrometry (ATR-FTIR), and scanning electron microscopy (SEM), but changes from thermogravimetric analysis (TGA), superficial area (BET), and the acidity/basicity properties were observed. Typical hydrotalcite with Mg 2+ /M 3+ = 3 was used as reference material and reach 45.1% of biodiesel conversion. Although the best conversion result (77.6%) was reached from the solid without Ga 3+ and with Mg 2+ /M 3+ ratio 4/1, there is an interesting correlation between the catalytic activities and the physicochemical properties of the solids with Ga 3+ and their respective homologous materials as discussed in this work.Keywords: ethyl biodiesel; bioenergy; hydrotalcites; metal oxides; heterogeneous catalysis. INTRODUÇÃOO biodiesel é um biocombustível composto por mistura de ésteres alquílicos produzidos a partir de álcoois de cadeias curtas, principalmente metanol e etanol, e glicerídeos graxos de origem vegetal ou animal, 1 e reconhecidamente causa menos impacto ambiental que o petrodiesel. Dados divulgados em 2016 pelo Ministério de Minas e Energia indicam que as principais matérias-primas graxas empregadas no Brasil são: óleo de soja (78%), gordura bovina (19%), óleo de algodão (2%), e outros óleos (0,9%). 2 Segundo a ANP (Agência Nacional do Petróleo, Gás Natural e Biocombustíveis), 3 em 2008, a adição de 2% de biodiesel ao petrodiesel passou a ser obrigatória, aumentando para 4% em 2009, 5% em 2010 e 7% em 2014. A produção nacional em 2015 atingiu 3,9 milhões de litros, e o governo brasileiro autorizou o uso voluntário de até 20% de biodiesel em frotas privadas, consumidores rodoviá-rios atendidos por ponto de abastecimento, e de 30% em transporte ferroviário, uso agrícola e industrial.Embora o uso de etanol seja menos frequente para a reação de transesterificação devido a sua higroscopicidade, o etanol é particularmente interessante para o Brasil em função da base industrial sucroalcooleira instalada e também pela baixa toxicidade deste álcool, comparada com a do metanol.A principal rota sintética comercial na produção de biodiesel envolve a reação de transesterificação entre matéria graxa e metanol por catálise alcalina homogênea usando NaOH ou KOH como catalisadores, pois apresenta baixo custo e elevados rendimentos, além da reação ocorrer em condições brandas de temperatura e sob pressão atmosférica. 4 No entanto esta rota apresenta fatores negativos como o não reaproveitamento do catalisador, produção de grande volume de ef...

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Cellulose biotemplates for layered double hydroxides networks

Cited by 33 publications

References 22 publications

Topochemical Engineering of Cellulose-Based Functional Materials

Topochemical Engineering of Cellulose-Based Functional Materials

In situ inorganic flame retardant modified hemp and its polypropylene composites

Óxidos metálicos derivados de materiais tipo hidrotalcitas contendo Ga3+ como catalisadores para síntese de biodiesel etílico

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