Heat Modification of Chinese Fir Wood Catalyzed by Fly Ash under Mild Temperature,ACS Sustainable Chemistry & Engineering

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Heat Modification of Chinese Fir Wood Catalyzed by Fly Ash under Mild Temperature
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2023-09-19 , DOI: 10.1021/acssuschemeng.3c03525
Tianyi Zhan ₁ , Tianle Jiang ₁ , Tao Shi ₁ , Hui Peng ₁ , Jianxiong Lyu ₁

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Heat modification (HM) can enhance the physical and mechanical properties of wood, but conventional HM (CoHM) requires high temperatures (above 180 °C) and consumes significant energy. Herein, fly ash was impregnated into Chinese fir for catalytic degradation at mild temperatures (100, 120, and 140 °C). After combining impregnation and HM (Im-HM) at mild temperatures, fly ash was deposited as Si- and Al-related floccules on the surface of the modified wood. These floccules accelerated the degradation of hemicellulose, resulting in weight loss percentages (1.85–5.21%) similar to those achieved with CoHM treatment at 160, 180, or 200 °C. The chromaticity of the Im-HM samples approached that of the CoHM samples when treated at 200 and 220 °C. The Im-HM treatment also improved the water resistance and dimensional stability of the wood. The antiswelling efficiency of the Im-HM samples (16.50–33.80%) exceeded that of the CoHM samples modified at or below 180 °C (≤16.31%). The hydrophobicity of the wood was associated with the Im-HM temperature and duration. A greater hydrophobicity was obtained at higher temperatures or longer durations. Our findings demonstrate the feasibility of catalytic degradation through fly ash impregnation, which offers a potential method for producing sustainable wood products with enhanced properties.

中文翻译：

粉煤灰催化杉木低温热改性

热改性（HM）可以增强木材的物理和机械性能，但传统的热改性（CoHM）需要高温（180°C以上）并消耗大量能量。本文将粉煤灰浸渍到杉木中，在温和温度（100、120 和 140 °C）下进行催化降解。在温和温度下将浸渍和 HM (Im-HM) 结合后，飞灰以 Si 和 Al 相关絮凝物的形式沉积在改性木材的表面上。这些絮凝物加速了半纤维素的降解，导致重量损失百分比 (1.85–5.21%) 与在 160、180 或 200 °C 下使用 CoHM 处理所获得的重量损失百分比相似。在 200 和 220 °C 下处理时，Im-HM 样品的色度接近 CoHM 样品的色度。Im-HM 处理还提高了木材的耐水性和尺寸稳定性。Im-HM 样品的抗膨胀效率 (16.50–33.80%) 超过了在 180 °C 或以下改性的 CoHM 样品 (≤16.31%)。木材的疏水性与 Im-HM 温度和持续时间相关。在更高的温度或更长的持续时间下获得更大的疏水性。我们的研究结果证明了通过粉煤灰浸渍催化降解的可行性，这为生产具有增强性能的可持续木制品提供了一种潜在方法。

更新日期：2023-09-19

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