PHYSICOCHEMICAL CHARACTERIZATION OF GREEN COCONUT MESOCARP BIOMASS (COCOS NUCIFERA L.): PROMISING PERSPECTIVES IN BIOCARBON PRODUCTION

Yslaine Andrade de Almeida; Iara de Fatima Gimenez; Giancarlo Richard Salazar Banda

Título do Trabalho

Autores

Yslaine Andrade de Almeida
Iara de Fatima Gimenez
Giancarlo Richard Salazar Banda

Modalidade

Resumo

Área temática

Biotecnologia ambiental e remediação

Data de Publicação

15/04/2024

País da Publicação

Brasil

Idioma da Publicação

Português

Página do Trabalho

https://www.even3.com.br/anais/xv-laseac-x-enqamb-2024i/785252-physicochemical-characterization-of-green-coconut-mesocarp-biomass-(cocos-nucifera-l)--promising-perspectives-in

ISBN

978-65-272-0404-6

Palavras-Chave

Coconut; Mesocarp; Biomass; Characterization; Biocarbon

Resumo

Addressing the environmentally significant issue of green coconut waste in Sergipe is pivotal as it presents opportunities to effectively address rejected materials that might otherwise be improperly discarded. One promising solution involves harnessing this waste to produce biochar with interesting properties through processes such as pyrolysis. A comprehensive understanding of the main physicochemical characteristics of the carbon source is crucial in this context. The green coconut mesocarp underwent physical pre-treatment and extensive characterization in this study. This involved elemental analyses, Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), scanning electron microscopy (SEM) with energy-dispersive X-ray spectroscopy (EDS), and nitrogen adsorption analysis was conducted using the Brunauer, Emmett, and Teller (BET) method, Dubinin-Radushkevich (DR), and Density Functional Theory (DFT). The results in determining the content were consistent with lignocellulosic biomass according to preliminary reports in biochar production. Analyzed contents included moisture, volatile matter, ash, fixed carbon, organic material, extractives, cellulose, hemicellulose, and lignin. Among these, moisture content was low at approximately 9.94%, making it ideal for pyrolysis. The extractives content revealed a high concentration of about 43.36%, considered high compared to other studies with the same biomass but different parts and extraction methodologies for the green coconut used in this study. Consequently, notable differences were observed in the lignin percentage, approximately 6.76%, significantly lower than values found in previous studies. FTIR analysis highlighted essential functional structural groups identified in lignocellulosic biomass, composed of cellulose, hemicellulose, and lignin, exhibiting specific characteristics. Vibrations around 3328 cm-1 for hydroxyl groups and a region between 3700 and 3000 cm-1 for vibrations of these groups were notable. Other bands indicated the presence of specific components, such as hemicellulose and lignin, with stretches of C-H groups, carbonyl C=O, and C-C and C-O bonds. The thermogravimetric curve revealed four thermal events. The first, up to 140 °C, involved fiber dehydration and removal of volatile compounds (10.49%). The second, with a loss of 13.49%, was associated with fatty acids and esters. The third, starting at 230 °C, indicated hemicellulose degradation (13.50%). The fourth, starting at 240 °C, was associated with cellulose degradation, losing approximately 36.30%. Lignin decomposition was extensive, complicating clear identification. After 400 °C, low-intensity events occurred, culminating in a peak around 900 °C, attributed to the presence of residual lignin. SEM micrographs illustrated the exposure of cellulose fibers, characterized by a scaly texture and a rough, irregular surface covered by organic materials. EDS data highlighted element distribution, with carbon (33.99%), oxygen (63.55%), and phosphorus (0.64%) concentrated in the primary part of the fiber, while potassium (1.83%) was slightly dispersed. As evidenced in previous studies, initially low porosity and surface area may be modified during pyrolysis, presenting values of 0.656 m2/g (BET), micropore volume of 0.003458 cm3/g (DR), and pore diameter of 3.169 nm (DFT). Our results are crucial for the sustainable exploration of biomasses in the production of porous carbon from biochar, contributing to environmentally responsible waste management.

Título do Evento: XV LASEAC - X ENQAmb 2024.
Cidade do Evento: Ouro Preto
Título dos Anais do Evento: Anais do XV LASEAC (Latin American Symposium on Environmental Analytical Chemistry) & X ENQAmb (Encontro Nacional de Química Ambiental)
Nome da Editora: Even3
Meio de Divulgação: Meio Digital

Como citar

ALMEIDA, Yslaine Andrade de; GIMENEZ, Iara de Fatima; BANDA, Giancarlo Richard Salazar. PHYSICOCHEMICAL CHARACTERIZATION OF GREEN COCONUT MESOCARP BIOMASS (COCOS NUCIFERA L.): PROMISING PERSPECTIVES IN BIOCARBON PRODUCTION.. In: . Disponível em: https//www.even3.com.br/anais/xv-laseac-x-enqamb-2024i/785252-PHYSICOCHEMICAL-CHARACTERIZATION-OF-GREEN-COCONUT-MESOCARP-BIOMASS-(COCOS-NUCIFERA-L)--PROMISING-PERSPECTIVES-IN. Acesso em: 02/08/2025