摘要
对以脱硅稻壳为原料、Na OH和Na2CO3为混合活化剂制备活性炭的工艺进行了4因素(活化温度、活化时间、活化剂混合比、浸渍液质量分数)3水平的响应面优化研究.结果显示:活化温度和浸渍液质量分数对活性炭的碘吸附值有显著地影响.在活化温度635℃,活化时间35 min,混合比4∶1,浸渍液质量分数40%时碘吸附值出现极值,验证实验的碘平均值为1 383.5 mg/g,与预测值基本吻合.另外对所制活性炭进行了性能表征,采用SEM表征了活性炭的形貌,BET法计算了活性炭的比表面积,BJH方程计算出活性炭的孔径分布.得到其比表面积为1 566.1 m2/g,平均孔径为2.05 nm,总孔容为0.80 cm3/g.
The activated carbon was prepared from desilicon rice husk by compound activating agents （NaOH and Na2CO3） . The influence of four factors （activation temperature, activation time, mixed ratio, mass con- centration of the impregnating solution） and three levels w investigated. The process was optimized by re- sponse surface methodology. The results showed that activation temperature and concentration of the impregna- ting solution were important factors on iodine adsorption value of activated carbon. The best conditions of pre- paring activated carbon the activation temperature of 635~C , activation time of 35 min, the mixing ratio of 4： 1, mass concentration of the impregnating solution of 40%. The iodine adsorption value was 1383.5 mg/g, which was consistent with the predicted values. The structure and morphology of samples characterized by SEM. The specific surface area and pore-size distribution calculated by the methods of BET and BJH, respec- tively. The activated rice husk carbon exhibit a high specific surface area of 1566. l m2/g, average pore diam- eter of 2.05 nm, total pore volume of 0.80 cm3/g.
出处
《郑州大学学报（工学版）》
CAS
北大核心
2015年第2期120-124,共5页
Journal of Zhengzhou University（Engineering Science）
基金
车用燃料技术国家重点实验室开放课题(2013007)
河南省高等学校青年骨干教师资助计划
关键词
响应面
混合碱活化
脱硅稻壳
活性炭
表征
response surface method
compound activating agent
desilicon rice husk
activated carbon
characterization
