Nanocellulose of eucalyptus residues from Bombinatory methods: pretreatments microwave assisted and acid and enzymatic isolation with modification by surfactants

• Grant number: 17/25039-8
• Support Opportunities: Scholarships in Brazil - Master
• Start date: March 01, 2018
• End date: August 31, 2019
• Field of knowledge: Engineering - Materials and Metallurgical Engineering - Nonmetallic Materials
• Agreement: Coordination of Improvement of Higher Education Personnel (CAPES)
• Principal Investigator: Derval dos Santos Rosa
• Grantee: Paulo Henrique Camani
• Host Institution: Centro de Engenharia, Modelagem e Ciências Sociais Aplicadas (CECS). Universidade Federal do ABC (UFABC). Ministério da Educação (Brasil). Santo André , SP, Brazil

Abstract

The use of lignocellulosic materials, from residues with high cellulose contents, has aroused great interest in the scientific and technological communities to obtain cellulose nanostructures (CNSs). However, difficulties for the isolation of these nanoparticles have been found, such as the high reaction time, the excessive reagent expenditure and low yields of CNSs. To improve the processes, technologies involving the use of microwave have been sharpened to improve the efficiency of their preparations. Moreover, the chemical modification of nanocellulose by surfactants can enhance the interaction with polymers for nanocomposites applications. The aim of this project is to isolate the nanocellulose of eucalyptus residues from the alkali pretreatment, followed by bleaching, using two methodologies will be microwave assisted and non-assisted. After that, two different steps of CNSs isolation will be used: a) acid hydrolysis and b) enzymatic hydrolysis. The obtained nanostrucutures will be submitted to surface modification using the surfactante cetyltrimethylammonium bromide (CTAB). CNSs without and with treatment will be characterized by Fourier transform infrared spectroscopy (FTIR), field emission scanning electron microscopy (SEM), thermogravimetric analysis (TG), X-ray diffraction (XRD), dynamic light scattering (DLS), potential zeta, contact angle (CA), quantification of lignocellulosic contents and conductometric titrations. It will expected that the pretreatment microwave assisted shows greater efficiency in the removal of lignin, hemicellulose and extractives, and that the isolation and surface modification (CTAB) promotes the obtaintion od CNSs more dispersed in aquous solutions more concentrated with homogeneous dimensions and with high aspect ratio. (AU)

Scientific publications

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

CAMANI, PAULO H.; ANHOLON, BEATRIZ F.; TODER, RICK R.; ROSA, DERVAL S.. Microwave-assisted pretreatment of eucalyptus waste to obtain cellulose fibers. Cellulose, v. 27, n. 7, FEB 2020. (17/25039-8, 18/11277-7)

DE MELO FIORI, ANA PAULA SANTOS; CAMANI, PAULO HENRIQUE; ROSA, DERVAL DOS SANTOS; CARASTAN, DANILO JUSTINO. Combined effects of clay minerals and polyethylene glycol in the mechanical and water barrier properties of carboxymethylcellulose films. INDUSTRIAL CROPS AND PRODUCTS, v. 140, NOV 15 2019. (17/25039-8)

CAMANI, PAULO HENRIQUE; MACHADO TOGUCHI, JOSE PAULO; FIORI, ANA PAULA S. M.; ROSA, DERVAL DOS SANTOS. Impact of unmodified (PGV) and modified (Cloisite20A) nanoclays into biodegradability and other properties of (bio)nanocomposites. APPLIED CLAY SCIENCE, v. 186, MAR 1 2020. (17/25039-8, 18/11277-7)