Abstract The effects of microwave-assisted acid pretreatment on the characteristics and pyrolysis behavior of moso bamboo sawdust (BS) were investigated by ultimate, Fourier transform infrared spectroscopy, thermogravimetric (TG), and pyrolysis–gas chromatography/mass spectrometry (Py-GC/MS) analyses in this study. Microwave temperature (100 °C–200 °C), reaction time (30 min–90 min), and acid concentration (0.5 M–1.5 M) were the main influencing factors. Results of ultimate analysis indicated that the properties of the pretreated samples are better than those of the raw BS. Moreover, appropriately reducing the oxygen and ash contents and increasing the microwave temperature promoted decarboxylation and dehydration during pretreatment. Microwave-assisted acid pretreatment decreased the acetyl groups and hydrogen bonds. Of the three main influencing factors affecting the structure of moso BS, microwave temperature was the most important. TG analysis results indicated that the thermostability of the pretreated samples is improved after pretreatment. Moreover, the pyrolysis behavior of moso BS is insensitive to the reaction time and acid concentration under mild conditions. The relative contents of acids, furans, aldehydes, and ketones derived from the pretreated samples decreased according to the results of Py-GC/MS. Meanwhile, the relative glucopyranose and phenol contents of the pretreated samples are higher than those of the raw moso BS and achieve the maximum values of 48.31% and 20.18%, respectively, at 200 °C.

中文翻译：

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微波辅助酸预处理毛竹木屑的性质及热解行为

摘要 通过极限、傅里叶变换红外光谱、热重 (TG) 和热解-气相色谱/质谱 (Py-GC/ MS) 在本研究中进行了分析。微波温度 (100 °C–200 °C)、反应时间 (30 min–90 min) 和酸浓度 (0.5 M–1.5 M) 是主要影响因素。最终分析结果表明，预处理样品的性能优于原始BS。此外，适当降低氧和灰分含量和提高微波温度有利于预处理过程中的脱羧和脱水。微波辅助酸预处理减少了乙酰基和氢键。在影响moso BS结构的三个主要影响因素中，微波温度最为重要。TG分析结果表明预处理后样品的热稳定性得到改善。此外，在温和条件下，moso BS 的热解行为对反应时间和酸浓度不敏感。根据 Py-GC/MS 的结果，来自预处理样品的酸、呋喃、醛和酮的相对含量降低。同时，预处理样品的吡喃葡萄糖和苯酚的相对含量高于原始 moso BS，在 200 °C 时分别达到最大值 48.31% 和 20.18%。TG分析结果表明预处理后样品的热稳定性得到改善。此外，在温和条件下，moso BS 的热解行为对反应时间和酸浓度不敏感。根据 Py-GC/MS 的结果，来自预处理样品的酸、呋喃、醛和酮的相对含量降低。同时，预处理样品的吡喃葡萄糖和苯酚的相对含量高于原始 moso BS，在 200 °C 时分别达到最大值 48.31% 和 20.18%。TG分析结果表明预处理后样品的热稳定性得到改善。此外，在温和条件下，moso BS 的热解行为对反应时间和酸浓度不敏感。根据 Py-GC/MS 的结果，来自预处理样品的酸、呋喃、醛和酮的相对含量降低。同时，预处理样品的吡喃葡萄糖和苯酚的相对含量高于原始 moso BS，在 200 °C 时分别达到最大值 48.31% 和 20.18%。根据 Py-GC/MS 的结果，来自预处理样品的酮减少。同时，预处理样品的吡喃葡萄糖和苯酚的相对含量高于原始 moso BS，在 200 °C 时分别达到最大值 48.31% 和 20.18%。根据 Py-GC/MS 的结果，来自预处理样品的酮减少。同时，预处理样品的吡喃葡萄糖和苯酚的相对含量高于原始 moso BS，在 200 °C 时分别达到最大值 48.31% 和 20.18%。