富含中、微孔稻壳活性炭的表征及液相吸附性能

对采用CO2-NaOH联合活化新工艺制备的稻壳活性炭的孔结构进行了表征,并用探针分子亚甲基蓝、苯酚考察了它对大、小分子的液相吸附性能.结果表明:所得活性炭同时富含中孔与微孔,中、微孔容积均达到0.32cm3/g,各占总孔容的50%;它对苯酚及亚甲基蓝均显示出优越的吸附性能,脱除效率分别达到94%和99%,超过或接近所用优质商业活性炭的相应值;对这2种污染物的吸附皆较好地符合Langmuir等温式.

Characterization and adsorption performance of micro-mesoporous rice husk active carbon

Attempts were made to characterize the pore structure of rice husk active carbon prepared by a new combined activation of CO2 and NaOH, and to investigate its adsorption toward large and small molecules by using methylene blue and phenol as probe molecules. The results showed that the micropore and mesopore volume both reached 0.32cm3/g and each accounted for 50% of the total pore volume, which indicated the abundance of both micropores and mesopores in the active carbon. The active carbon displayed strong adsorption ability. The removal percentages reached 94% for phenol and 99% for methylene blue. These values were comparable to those of the excellent commercial active carbon. Besides, adsorption of the two pollutants onto the active carbon both well followed the Langmuir isotherm.