The efficient conversion of biomass waste into valuable products is a critical challenge in sustainable energy and environmental management. Microwave pyrolysis of hemp stem and corn stover was studied for producing biochar suitable for CO adsorption, catalysts, water treatment, and soil enhancement. The effects of microwave power and absorbent agents on maximum temperature, yields, and biochar properties were investigated. Elevated power (33–120 W/g) reduced yield (42–16 wt%, 38 to 16 wt%) but increased carbon content (67–78 wt%, 65 to 75 wt%), BET surface area (1.05–69.37 m/g, 0.59–43.18 m/g) for hemp stem and corn stover respectively. Microwave absorbents like graphite, activated carbon, and water improved heating and biochar quality. Activated carbon notably increased carbon content (76–82 % wt, 71–80 % wt) and surface area (6.59–91.99 m/g, 9.99–50.51 m/g) for hemp stem and corn stover respectively. CO adsorption highlighted biochar microstructure with pore sizes averaging around 1 nm for both biomass. These findings demonstrate the potential of microwave-assisted pyrolysis and the use of absorbent agents to produce high-quality biochar for various applications.

中文翻译：

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微波辅助热解生物质废物生产高品质生物炭：玉米秸秆和大麻茎案例研究


将生物质废物有效转化为有价值的产品是可持续能源和环境管理的关键挑战。研究了大麻茎和玉米秸秆的微波热解生产适用于二氧化碳吸附、催化剂、水处理和土壤改良的生物炭。研究了微波功率和吸收剂对最高温度、产率和生物炭特性的影响。功率提高 (33–120 W/g) 会降低产量 (42–16 wt%、38 至 16 wt%)，但会增加碳含量 (67–78 wt%、65 至 75 wt%)、BET 表面积 (1.05–69.37) m/g，0.59–43.18 m/g）分别适用于大麻茎和玉米秸秆。石墨、活性炭和水等微波吸收剂可改善加热和生物炭质量。活性炭分别显着增加了大麻茎和玉米秸秆的碳含量（76–82% wt、71–80% wt）和表面积（6.59–91.99 m/g、9.99–50.51 m/g）。 CO 吸附突出了生物炭的微观结构，两种生物质的孔径平均约为 1 nm。这些发现证明了微波辅助热解和使用吸收剂生产用于各种应用的高质量生物炭的潜力。