Thermal, structural, and compositional evaluation of coyol shell pretreatments for enhanced lignocellulosic biomass utilization

IF 5.8 2区生物学 Q1 AGRICULTURAL ENGINEERING

Biomass & Bioenergy Pub Date : 2025-02-01 DOI:10.1016/j.biombioe.2024.107518

Fidel A. Aguilar-Aguilar , Violeta Y. Mena-Cervantes , Cesar Romero-Hernández , Fabián S. Mederos-Nieto , Alejandro Ramírez- Estada , Raúl Hernández-Altamirano

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Abstract

The valorization of coyol shell (Acrocomia aculeata) lignocellulose presents significant potential for biofuel and bioproduct production yet remains underexplored. This study assessed the impact of three pretreatment methods—NaOH, NaOH/Na₂S, and EtOH—on the structural, thermal, and chemical properties of the coyol shell to enhance its utilization in biorefinery processes. Using advanced characterization techniques such as Fourier-transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), elemental analysis, and scanning electron microscopy (SEM), this research provides a detailed comparative analysis of pretreatment methods on this underutilized biomass. FTIR results revealed significant reductions in hydroxyl (3300 cm⁻¹) and carbonyl (1735 cm⁻¹) groups, with EtOH showing the most effective hemicellulose and lignin degradation. TGA analysis indicated an increase in volatile matter content after pretreatments, with EtOH retaining 95.16 %, NaOH 96.09 %, and NaOH/Na₂S 95.97 %, compared to 73.97 % in untreated biomass. Elemental analysis showed an increase in carbon content (C) and a decrease in oxygen-to-carbon (O/C) ratio across all pretreatments, highlighting improved energy density and suitability for biofuel production. SEM analysis confirmed structural disruption, with NaOH/Na₂S yielding the most fragmented and porous morphology, facilitating further biomass processing. The theoretical biochemical methane potential (BMP) demonstrated that NaOH achieved 396 mL CH₄/g VS, significantly higher than untreated biomass at 327 mL CH₄/g VS. This indicates the enhanced accessibility of fermentable components, making pretreated biomass suitable for biogas production. The results establish a foundation for optimizing pretreatment strategies to enhance the valorization of coyol shell in sustainable biorefinery frameworks, contributing to a circular bioeconomy.

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coyol壳预处理提高木质纤维素生物质利用率的热、结构和成分评价

豆蔻醇壳（Acrocomia aculeata）木质纤维素的增值在生物燃料和生物产品生产方面具有巨大的潜力，但仍未得到充分开发。本研究评估了NaOH、NaOH/Na₂S和etoh三种预处理方法对椰醇壳结构、热学和化学性质的影响，以提高其在生物炼制过程中的利用率。本研究利用傅里叶变换红外光谱（FTIR）、热重分析（TGA）、元素分析和扫描电镜（SEM）等先进表征技术，对未充分利用的生物质的预处理方法进行了详细的对比分析。FTIR结果显示羟基（3300 cm - 1）和羰基（1735 cm - 1）基团的显著减少，乙醚显示出最有效的半纤维素和木质素降解。TGA分析表明，预处理后的挥发物含量增加，EtOH保留95.16%，NaOH保留96.09%，NaOH/Na₂S保留95.97%，而未经处理的生物量为73.97%。元素分析显示，在所有预处理过程中，碳含量(C)增加，氧碳比（O/C）降低，突出表明能量密度提高，适合生物燃料生产。SEM分析证实了结构破坏，NaOH/Na₂S产生最破碎和多孔的形态，有利于进一步的生物质处理。理论生化甲烷势（BMP）表明，NaOH达到396 mL CH₄/g VS，显著高于未处理的327 mL CH₄/g VS，这表明可发酵成分的可及性增强，使预处理的生物质适合沼气生产。研究结果为优化预处理策略奠定了基础，以提高可持续生物炼制框架中coyol壳的价值，为循环生物经济做出贡献。

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来源期刊

Biomass & Bioenergy 工程技术-能源与燃料

CiteScore

11.50

自引率

3.30%

发文量

258

审稿时长

60 days

期刊介绍： Biomass & Bioenergy is an international journal publishing original research papers and short communications, review articles and case studies on biological resources, chemical and biological processes, and biomass products for new renewable sources of energy and materials. The scope of the journal extends to the environmental, management and economic aspects of biomass and bioenergy. Key areas covered by the journal: • Biomass: sources, energy crop production processes, genetic improvements, composition. Please note that research on these biomass subjects must be linked directly to bioenergy generation. • Biological Residues: residues/rests from agricultural production, forestry and plantations (palm, sugar etc), processing industries, and municipal sources (MSW). Papers on the use of biomass residues through innovative processes/technological novelty and/or consideration of feedstock/system sustainability (or unsustainability) are welcomed. However waste treatment processes and pollution control or mitigation which are only tangentially related to bioenergy are not in the scope of the journal, as they are more suited to publications in the environmental arena. Papers that describe conventional waste streams (ie well described in existing literature) that do not empirically address ''new'' added value from the process are not suitable for submission to the journal. • Bioenergy Processes: fermentations, thermochemical conversions, liquid and gaseous fuels, and petrochemical substitutes • Bioenergy Utilization: direct combustion, gasification, electricity production, chemical processes, and by-product remediation • Biomass and the Environment: carbon cycle, the net energy efficiency of bioenergy systems, assessment of sustainability, and biodiversity issues.