To explore the effects of pretreatment methods including drying, vacuum freezing drying (VFD), pelleting, and ultrasonic vibration-assisted pelleting (UV-AP) on corn stover and biochar properties, the physicochemical and morphological changes of biomass before and after pretreatment were examined, and the effects of different pretreatment methods on biochar properties were investigated. The results showed that different pretreatment methods have a significant effect on the surface and internal structure of biochar. The highest and lowest specific surface area, micropore area, and total pore volume of biochar were 25.84 m²/g, 9.27 m²/g, 0.53 cm³/g, and 17.33 m²/g, 4.39 m²/g, 0.29 cm³/g, respectively. FTIR analysis showed that the functional group of pretreated corn stover was similar to those of biochar. Ultimate analysis indicated that both pretreatment methods and the highest treatment temperature had a significant effect on biochar compositions. The order of carbon content of biochar derived from different pretreatment methods was drying > VFD > UV-AP > pelleting. The biochar yield, enhancement factor, and energy yield were significant affected by pretreatment methods. By contrast, the biochar pH was alkaline and not significantly affected by pretreatment methods. These findings provide a reliable route to choose pretreatment methods for producing biochar with desired properties, which could be a guide for industrial application.

为探讨干燥、真空冷冻干燥 (VFD)、制粒和超声波振动辅助制粒 (UV-AP) 等预处理方法对玉米秸秆和生物炭特性的影响，研究了预处理前后生物质的理化和形态变化。 ，并研究了不同预处理方法对生物炭特性的影响。结果表明，不同的预处理方法对生物炭的表面和内部结构有显着影响。的最高和最低的比表面积，微孔面积，并且生物炭的总孔体积是25.84米² / g时，9.27米² / g时，0.53厘米³ / g，并且17.33米² / g时，4.39米² /克，0.29厘米³/g，分别。FTIR分析表明，经过预处理的玉米秸秆的官能团与生物炭相似。最终分析表明，预处理方法和最高处理温度都对生物炭成分有显着影响。不同预处理方法得到的生物炭的碳含量顺序为干燥>VFD>UV-AP>造粒。生物炭产量、增强因子和能量产量受预处理方法的显着影响。相比之下，生物炭的 pH 值呈碱性，不受预处理方法的显着影响。这些发现为选择制备具有所需特性的生物炭的预处理方法提供了可靠的途径，可为工业应用提供指导。