Optimization of the Preparation Process and Characterization of the Performance of Tobacco Straw-based Activated Carbon

HUANG Shijie; FANG Zhihui; ZHOU Yun; LIANG Miao; LI Ruili; ZHANG Jiahui; CHEN Zhiyan; ZHANG Junsong

doi:10.15933/j.cnki.1004-3268.2025.01.018

Abstract：In order to understand the preparation process of tobacco straw-based activated carbon and its effect on the pore structure,taking the tobacco straw as the carbon source,and the structure and morphology of tobacco straw-based activated carbon were characterized by BET surface area detection method,scanning electron microscope(SEM),X-ray photoelectron spectroscopy(XPS)using specific surface area,total pore volume and microporosity as the investigated indexes.The results showed that the surface morphology and pore structure of activated carbons prepared with different activators differed considerably,and the types of functional groups were basically the same,but the content and proportion varied.Activation temperature had a greater influence on surface area and total pore volume,while the main factor influencing microporosity was activation time.The optimum process conditions were obtained:KOH as activator,material ratio(tobacco straw∶activator,mass ratio)of 1∶2,impregnation time of 12 h,activation temperature of 800 ℃,activation time of 60 min.The specific surface area of the optimum tobacco straw-based activated carbon prepared was 1 980.91 m2/g,the total pore volume was 1.215 1 cm3/g,and the microporosity was 66.66％.Adsorption of β-phenylethanol by optimal tobacco straw-based activated carbon reached 101.49％,and the desorption rate was 35.78％at 35 d.The pore structure of the tobacco straw-based activated carbon prepared under the optimal conditions is well developed,with a rich variety of functional groups and good adsorption performance,which provides theoretical support for the multi-purpose utilization of tobacco straw waste and the preparation of high-performance tobacco straw-based activated carbon.