氯化锌活化法制备多孔炭陶复合吸附材料

以氯化锌浸渍的木屑为原料，黏土为粘结剂，制备炭陶复合吸附材料。讨论了炭化温度和保温时间对其吸附性能的影响，并对其孔隙结构进行了表征。结果表明，随温度和保温时间的增加，炭陶复合吸附材料的碘吸附值和亚甲基蓝吸附值呈先上升后下降的趋势；木屑受到活化作用形成活性炭而发生收缩，在活性炭和陶土之间形成空隙，有利于形成孔隙结构发达的炭陶复合吸附材料。在温度500℃、保温时间1 h的较佳工艺条件下，制得炭陶复合吸附材料的比表面积为809.5 m²/g，总孔容积为0.298 cm³/g，中孔容积为0.185 cm³/g，微孔容积为0.113 cm³/g，炭陶的含炭量为60.7%，碘吸附值为680.5 mg/g，亚甲基蓝吸附值为165.0 mg/g。

Preparation of Porous Carbon/Pottery Adsorptive Composite by Zinc Chloride Activation

Carbon/pottery adsorptive composite was prepared by using sawdust dipped with zinc chloride as raw material and clay as binder.The effects of temperature and holding time on the adsorption capability of carbon/pottery composite were studied,and the pore structure was characterized.The results showed that the iodine adsorption value and methylene blue adsorption value of carbon/pottery composite rose at first and went down later with the increase of temperature and holding time.The sawdust formed activated carbon by activation and shrank,so the voids between the activated carbon and pottery were produced.This favored the development of pore structure of carbon/pottery composite.Under the optimal conditions of temperature 500℃ and holding time 1 h,the specific surface area,total pore volume,mesopore volume,micropore volume,the carbon content,iodine adsorption value and methylene blue adsorption value were 809.5 m²/g, 0.298 cm³/g, 0.185 cm³/g, 0.113 cm³/g, 60.7%, 680.5 mg/g and 165.0 mg/g,respectively.