磁性活性炭的制备及其对邻苯二甲酸二丁酯的吸附

Preparation of Magnetic Activated Carbon and Its Adsorption of Dibutyl Phthalate

由于具备磁分离特性,磁性活性炭可以克服活性炭与水难以分离的缺点。本文采用化学共沉淀法制备了三种磁性活性炭并用于邻苯二甲酸二丁酯(DBP)吸附研究。研究发现,磁性活性炭的吸附效果虽然比活性炭稍差,但是依然具有良好的吸附效果。当吸附剂用量为0.4 g/L时,在25℃、150 rpm及不调节pH的条件下吸附3 h后,磁性活性炭的DBP吸附量可达164.1 mg/g。随着pH和温度的降低,磁性活性炭DBP的吸附效果变好,而且其吸附动力学与拟二级模型的拟合效果更好,吸附等温线更符合Freundlich模型。

Due to the magnetic separation property,magnetic activated carbon can overcome the disadvantage that activated carbon is difficult to separate from water.In this study,three kinds of magnetic activated carbon prepared by chemical coprecipitation method are used to adsorb dibutyl phthalate(DBP).It is found that the adsorption effect of magnetic activated carbon is slightly worse than that of activated carbon,but still has good adsorption effect.When the amount of adsorbent was 0.4 g/L,the adsorption capacity of magnetic activated carbon can reach 164.1 mg/g after 3 hours of adsorption at 25℃,150 rpm without pH adjustment.With the decrease of pH and temperature,the adsorption effect of magnetic activated carbon of DBP became better.The adsorption kinetics is better fitted to the pseudo second order model,and the adsorption isotherm is more consistent with the Freundlich model.