响应面法优化柚皮活性炭制备及其氨吸附性能

Optimization of the preparation of pomelo peel-derived activated carbon with response surface methodology and ammonia adsorption performance

以柚皮为原料、氯化锌为活化剂,经高温碳化制备活性炭;探讨了活化温度、浸渍比、活化时间对产物的形貌结构和孔隙特征的影响,并采用Doehlert设计法(DM)对柚皮炭的制备工艺条件进行响应面优化分析,得到关于氨吸附性能的二阶预测模型.在活化温度400℃、浸渍比为1.25、活化时间为60 min时,所制活性炭比表面积可达1325.9 m^(2)/g,表面存在大量羧基、羟基和胺基基团.响应面分析表明,活化温度对氨吸附值的影响大于浸渍比的影响,在活化温度417℃和浸渍比为1.27的优化条件下,所制备的柚皮炭的氨吸附容量为5.28 mg/g,优于普通商用活性炭.

In this paper,pomelo peel was used as the raw material,with ZnCl2 as the activator,to prepare activated carbon by carbonization at high temperature.The effects of activation temperature,impregnation ratio,and activation time on the morphology and pore characteristics of the product were studied.The DM design was used to optimize the preparation process of pomelo peel charcoal,and a second-order prediction model for ammonia adsorption performance was obtained.At an activation temperature of 400℃,an impregnation ratio of 1.25,and an activation time of 60 min,the specific surface area of the activated carbon prepared can reach 1325.9 m^(2)/g.There are a large number of carboxyl,hydroxyl,and amine groups on the surface of the product.The response surface analysis results show that,the influence of activation temperature is greater than that of the impregnation ratio,and under the optimal conditions of activation temperature 417℃and impregnation ratio of 1.27,ammonia adsorption capacity of as-prepared pomelo charcoal is 5.28 mg/g,which is superior to that of ordinary commercial activated carbon.