【摘要】 以农业废料棉花秸秆作为原料,采用化学活化法,氯化锌为活化剂制备高效的生物质活性炭。研究了浸渍比、活化剂浓度、活化温度、活化时间4个工艺参数对制备活性炭的得率及吸附碘值的影响。找到其最佳制备条件:浸渍比为4∶14(g·mL^-1),氯化锌浓度为3mol·L^-1,活化时间为500℃,活化时间为100min,在此条件下制得的活性炭其吸附碘值为1 050mg·g^-1,得率为53%,比表面积为1 383.7m2·g^-1,总孔容积为0.766cm3·g^-1,平均孔半径为1.1nm。考察活性炭在吸附时间、投加量、pH条件下对亚甲基蓝的吸附量,初始浓度为50mg·L^-1的亚甲基蓝,活性炭吸附量达到49.4mg·g^-1,吸附等温线可以用Langmuir模型描述。更多还原

【Abstract】 To prepare efficient biomass activated carbon with cotton stalk by method of ZnCl₂ chemical activation.Effects of impregnation ratio,activation temperature and activation time on the yield,iodine value.The considerable preparation conditions are obtained as follows:impregnation ratio of 4∶14(g·mL^-1),activation temperature at500 ℃ and activation time of 100 min.The iodine value of carbon prepared under above condition reached 1 050mg·g^-1,yield of 53%,the BET surface area of activated carbon reached 1 383.7m2·g^-1,total pore volume of 0.766cm3·g^-1,mean pore radius of 1.1nm.The capacities of this carbon for adsorbing capacity(49.4 mg·g^-1)of methylene blue solution(50mg·L^-1)were well represented by the Langmuir adsorption isotherm models.更多还原