桑枝基活性炭的制备及其对多环芳烃菲的吸附

Preparation of Waste Ramulus Mori-Based Activated Carbon and Adsorption for Phenanthrene(PAHs)

以废弃桑枝为原料,以磷酸氢二铵为活化剂制备活性炭,考察了浸渍比、炭化温度、炭化时间、活化温度和活化时间对活性炭的亚甲基蓝吸附值的影响,确定了制备桑枝基活性炭的最佳工艺条件。研究了桑枝基活性炭对水中多环芳烃菲的吸附性能。结果表明制备活性炭的最佳工艺条件:浸渍比为2∶1、炭化温度为400℃、炭化时间为90 min、活化温度为800℃、活化时间为120 min。制备的活性炭对多环芳烃菲具有较好的吸附效果,初始浓度为1 000μg/L的菲在桑枝活性炭上吸附去除率可达71.7%,吸附平衡时间为240 min。Freundlich吸附模型可较好地模拟菲在桑枝基活性炭上的吸附等温线。菲的吸附以物理吸附为主,吸附较易进行。

The activated carbon was prepared by using ramulus mori as raw material, diammonium phosphate as activator. Effects of impregnation ratio, carbonization temperature, carbonization time, activation temperature and activation time on adsorption of methylene blue by activated carbon prepared from ramulus mori was investigated and the optimum preparation conditions were determined. The adsorption capacity of carbon for phenanthrene was studied. The results show that the optimum conditions for preparation of the activated carbon from ramulus mori are as follows： impregnation ratio is 2： 1, carbonization temperature is 400 ~C, carbonization time is 90 rain, activation temperature is 800 ~C and activation time is 120 min. The prepared activated carbon has excellent adsorptive capacity for phenanthrene. The adsorption efficiency of phenanthrene with initial concentration of 1 000 μg/L is 71.7 %. The adsorption equilibrium times of phenanthrene are 240 min. The isotherm of phenanthrene can be described by Freundlich isotherm model. The adsorption of phenanthrene carries out easily and is dominated by physical adsorption.