磁性活性炭的制备及其对水中甲基橙的吸附

Preparation of magnetic activated carbon granules for adsorption of methyl orange in water

活性炭被广泛应用于水处理领域,然而吸附饱和后难以分离和再生的缺点却限制了其应用。本研究采用化学共沉淀法将铁氧化物和活性炭进行复合,制备出同时具有磁分离性能和较强的吸附性能的磁性活性炭复合材料,并对制备的复合材料进行表征,考察其对水中甲基橙的吸附性能。结果表明,制备的磁性活性炭的比表面积为666.72 m2/g,平均孔径为3.16 nm,具有良好的磁性能,在外加磁场下能快速地从溶液中分离出来且磁性能相对稳定,铁氧化物对活性炭吸附性能的影响不大。在温度为25℃、p H为5、吸附剂用量为3 g/L的情况下,吸附3 h后,该磁性活性炭对甲基橙的吸附率可达99.1%,预示着该磁性活性炭在水处理方面具有潜在的应用前景。

Activated carbons have been widely employed in water treatment field. However,there are some difficulties in separation and regeneration of the activated carbon saturated with pollutants relatively limits its application. We prepared magnetic activated carbon composites by chemical co-precipitation method which combined the magnetism of iron oxides with the high adsorption feature of activated carbon. The magnetic activated carbon which prepared under optimal conditions were characterized,the adsorption of methyl orange by this magnetic composites was also researched. Results showed that specific surface area of these composites is 666. 72 m2/g and average pore size is 3. 16 nm. The existence of iron oxides particles has little effect on adsorption property of the activated carbon / iron oxides,It can be rapidly separated from the solution under a magnetic field and the magnetic performance is relatively stable. The removal rate of methyl orange attained 99. 1% under the optimal conditions of temperature of 25℃,p H 5,magnetic activated carbon dosage of 3 g / L and adsorption time of 3 h,indicating that the magnetic activated carbon has potential application prospect in water treatment.