Abstract
BackgroundTo save energy and reduce emissions during the thermal modification of Moso bamboo, this study investigated the effect of the combined zinc chloride-ultrasound pretreatment and thermal modification on the physicochemical properties of Moso bamboo. MethodsSamples were pretreated using 5% (w/w) ZnCl2 solution and 40 kHz ultrasonic waves, followed by heat treatment at 160 °C. The samples were characterized by moisture absorption measurements, X-ray diffraction, Fourier-transform infrared spectroscopy, surface wettability measurements, thermogravimetric analysis, and colorimetry. FindingsThe results showed that the combined pretreatment method reduced the moisture absorption by 10.15% and increased the relative crystallinity of Moso bamboo cellulose by 4.4%. It also increased the surface contact angle by 25.2%, lowered the onset of thermal decomposition, reduced the temperature required for hemicellulose to reach its maximum thermal degradation rate by 49 °C, and increased the color change (∆E*ab) by 23.60.
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