杨树叶改性吸附剂对硝基苯的吸附性能研究

Adsorption Performance of Nitrobenzene onto the Modified Poplar Leaves

在探究磷酸改性杨树叶的条件基础上,研究接触时间、硝基苯溶液初始浓度、温度等因素对改性过后的杨树叶吸附硝基苯性能的影响。结果表明,在25℃,用2 mol/L磷酸溶液按照15 m L/g的改性剂用量改性后,杨树叶对硝基苯的吸附在70 min左右达到基本平衡,吸附过程满足准二级吸附动力学模型。随着硝基苯溶液初始浓度的增加,吸附率不断降低,吸附等温线满足Freundlich方程。吸附过程为放热过程,随着温度的升高,吸附效果下降。

On the basis of exploration to the optimum condition of poplar leaves modification with phosphoric acid,the effects of such factors as contact time,initial nitrobenzene concentration and temperature on nitrobenzene（ NB） adsorption onto the modified poplar leaves were studied. The results showed after the modification using 2mol / L phosphoric acid impregnation with dosage of 15 m L / g,the adsorption of NB onto the modified poplar leaves reached balance at 70 min,and the adsorption kinetics complied well with pseudo-second-order model. With the increase of initial NB concentration,the adsorption rate decreased,and the adsorption isotherm met Freundlich equation. The adsorption was exothermic and adsorption performance dropped with temperature rise.