棉秆、核桃壳活性炭吸附SO_(2)的性能研究

Adsorption of SO_(2)by Activated Carbon from Cotton Stalk and Walnut Shell

以新疆棉秆、核桃壳为原料,KOH为活化剂经炭化-活化制备生物质活性炭用于吸附SO_(2),比较相同条件下制备的棉秆和核桃壳生物质活性炭对SO_(2)的吸附性能。结果表明,炭化温度400℃,炭化时间60 min,剂料比为1∶1,活化温度800℃,活化时间60 min下制备的棉秆基活性炭对SO_(2)的吸附效果最好,棉秆活性炭饱和吸附量为62.887 mg/g,核桃壳生物质活性炭的饱和吸附量为22.050 mg/g。棉秆活性炭BET分析表明比表面积为1217.2474 m~2/g,总孔容为0.6403 cm~3/g;FT-IR分析有胺基、羟基等基团;XRD分析表面有石墨晶面(002)和(100)结构;SEM分析棉秆活性炭比核桃壳活性炭孔道丰富,孔隙分布均匀。

Biomass activated carbon was prepared with Xinjiang cotton stalk and walnut shell as raw materials and KOH as activator.The adsorption properties of cotton stalk and walnut shell biomass activated carbon for SO_(2)adsorption were compared under the same conditions.The results show that the carbonization temperature is 400℃,the carbonization time is 60 min,and the ratio of agent to material is 1∶1.The cotton stalk actirated carbon prepared at the activation temperature of 800℃and the activation time of 60 min had the best adsorption effect on SO_(2).The saturated adsorption capacity of cotton stalk activated carbon was 62.887 mg/g,and that of walnut shell biomass activated carbon was 22.050 mg/g.BET analysis of activated carbon showed that the specific surface area was 1217.2474 m^(2)/g and the total pore volume was 0.6403 cm^(3)/g.The amino groups and hydroxyl groups were detected by FT-IR analysis.XRD analysis showed that the surface of graphite crystal surface(002)and(100)structure;SEM analysis showed that the activated carbon from cotton stalk had more pores and uniform pore distribution than that from walnut shell.