活化剂改性秸秆基活性炭的制备及其表征

Preparation and characterization of cotton stalk-based activated carbon modified by activator

研究活化剂改性棉花秸秆在制备活性炭(AC)过程中的最优工艺。通过Design Expert 8.0软件建立活化条件与活性炭持水性能参数间的量化关系,研究AC在不同活化温度、活化时间、浸渍比和活化剂配比条件下持水性能的变化规律。利用扫描电镜(SEM)、傅里叶变换红外光谱、比表面积及孔径大小对AC的结构及组成进行表征分析。结果表明:活化剂配比是对AC持水性能影响显著的因子;最佳工艺条件为活化温度640.70℃、浸渍比1.58∶1、活化时间87.27 min、活化剂配比9.02∶1。在此条件下制得AC持水性能为2.551 g/g,与预测值(2.52 g/g)误差为1.24%,表明该模型用于棉秆基活性炭工艺优化实用价值较高。

The optimal process of preparing activated carbon(AC)from cotton straw modified by activator was studied.Design Expert 8.0 software was used to establish the quantitative relationship between the activation conditions and AC water retention performance parameters,and to study the change rules of AC water retention performance under different activation temperature,activation time,impregnation ratio and activator ratio.SEM,FTIR,specific surface area and pore size analysis are used to characterize and analyze the structure and composition of AC.The results show that the ratio of the activator has a significant impact on the water holding performance of AC,and that the optimal effects are expected under the activation temperature of 640.70℃,impregnation ratio of 1.58∶1,activation time of 87.27 min,and activator ratio of 9.02∶1.Under such conditions,the water holding capacity of the activated carbon is 2.551 g/g,an error of 1.24%compared to the predicted value(2.52 g/g).The model can be used to optimize the process of cotton stalk-based activated carbon.