稻壳制备活性炭Plackett-Burman工艺优化研究

Technology optimization for preparation of activated carbon from rice husk cracking using Plackett-Burman design

采用Plackett-Burman实验设计、最陡爬坡实验、Box-Behnken响应面优化设计对以稻壳为原料制备活性炭工艺条件进行优化。采用Plackett-Burman设计从影响碘吸附值的6个因素中筛选出氢氧化钠浓度、料液比、煅烧时间3个显著因素。通过最陡爬坡实验逼近最佳区域,采用Box-Behnken响应面优化设计对显著因素进行优化,得出最佳工艺条件为:氢氧化钠浓度为2.50 mol/L、溶煮时间为60 min、料液质量比为1.125、煅烧时间为37.5 min、煅烧温度为600℃。在此工艺条件下获得碘吸附值为807.76 mg/g,通过可靠性实验验证,实验误差为0.283%,说明本优化工艺条件可行。

Preparation technology of activated carbon from rice husk cracking was optimized by combined using Plackett- Bnrnmn design, steepest ascent design, and Box-Behnken design.Plackett-Burman design was applied to identify NaOH con- centrations, liquid ratio and calcined time as the most significant of 6 factors influencing the iodine absorption value.The cen- ter points of the three factors were determined based on steepest ascent design.The optimization of three factors was carried out by using Box-Behnken design.Results showed that the optimal conditions were as follows：NaOH concentration was 2.50 mol/L,reaction time was 60 min,mass ratio of material to liquid was 1.125,calcined time was 37.5 min,and calcined temperature was 600 ℃.Under these conditions,the analogy computing iodine absorption value was 807.76 mg/g.The average relative error was 0.283% according to reliability experiment.In conclusion, the optimized process was feasible.