菌糠生物炭制备工艺优化与孔结构演变规律研究OA

A Biochar was prepared using spent mushroom substrate from Xinjiang agricultural wastes as the raw material,through a process involving alkalization pretreatment,pyrolysis in a tube furnace and acidification post-treatment.An L16(4³)orthogonal experimental design was employed to systematically investigate the effects of three key process parameters--pyrolysis temperature,heating rate,and residence time--on the BET specific surface area of biochar,and to evaluate the significance of each factor.The results showed that the heating rate was the most critical factor affecting the specific surface area of the pyrolysis products,followed by the pyrolysis temperature,while the residence time had the least impact on the experimental outcomes.Through the synergistic optimization of calcination temperature,heating rate and pyrolysis time,the optimal process parameters were finally determined to be a calcination temperature of 800℃,a heating rate of 10℃/min and a pyrolysis time of 3 h.Under the optimal single-factor levels,the maximum BET specific surface area of the material reached 3 588.97 m2/g,with the micropore contribution ranging from 86.1%to 89.3%.This study investigated the key process conditions for preparing high-specific-surface-area biochar using spent mushroom substrate as a raw material.The findings hold certain scientific significance for the resource utilization of agricultural solid wastes and their applications in fields such as adsorption and catalysis.