Eyong wood (Eribroma oblonga), a good candidate for hydrothermal treatment: Optimization of its physical and colorometric properties under the determinant pH effect

Q1 Environmental Science

Bioresource Technology Reports Pub Date : 2025-05-15 DOI:10.1016/j.biteb.2025.102148

Jean Jalin Eyinga Biwôlé , Achille Bernard Biwole , Pierre Marie Tefack , Eric Ntabé Ncharye , Evariste Fongnzossie Fedoung , Josias Georges Bessike , John Nwoanjia , Armel Edwige Mewoli , Antonio Pizzi , Salomé Ndjakomo Essiane , Joseph Zobo Mfomo

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Abstract

Study evaluates the impact of hydrothermal treatment on Eyong wood (Eribroma oblonga) at 145 °C, 160 °C, and 180 °C, focusing on its colorimetric, physical, and chemical properties. Treatment resulted to a progressive darkening (ΔE* = 17.72 ± 2.70 at 180 °C) with a decrease in brightness (L*), increased red hues (a*), decreased yellow hues (b*), a lower hue angle (h), and a decline in pH, enhancing its aesthetic appeal. Physically, reduced equilibrium moisture content (13.57 % to 7.40 %), volume shrinkage (10.45 % to 7.04 %), density (698.97 to 646.76 kg/m³), and water absorption (20.36 ± 2.43 % to 16.64 ± 1.14 %) improved dimensional stability. Chemically, lignin content increased (9.21 % to 13.01 %), while hemicelluloses decreased (44.84 % to 41.80 %), as confirmed by ¹³C NMR. Compared to dry heat, chemical, silicone oil, and saturated steam treatments, hydrothermal treatment enhanced moisture resistance and durability, making it a promising method for outdoor applications where the structure is subject to color variations. Further research should optimize mechanical and biological resistance.

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水热处理的候选者——榆木：决定pH效应下其物理和比色性能的优化

研究评估了145°C、160°C和180°C水热处理对永木（Eribroma oblonga）的影响，重点关注其比色、物理和化学性质。处理导致逐渐变暗（ΔE* = 17.72±2.70,180°C），亮度降低（L*），红色调增加（a*），黄色调减少（b*），色相角降低(h)， pH值下降，增强了其美学吸引力。物理上，平衡含水率（13.57%至7.40%）、体积收缩率（10.45%至7.04%）、密度（698.97至646.76 kg/m3）和吸水率（20.36±2.43%至16.64±1.14%）的降低提高了尺寸稳定性。化学性质上，木质素含量增加（9.21% ~ 13.01%），半纤维素含量减少（44.84% ~ 41.80%）。与干热、化学、硅油和饱和蒸汽处理相比，水热处理增强了防潮性和耐久性，使其成为一种很有前途的室外应用方法，其结构受颜色变化的影响。进一步的研究应优化机械和生物抗性。

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