氨基改性MCM-41对阴离子染料酸性品红的吸附研究

Adsorption of Anionic Dye Acid Fuchsin by Amino Modified MCM-41

采用3-氨丙基三甲氧基硅烷对MCM-41进行氨基功能化修饰,并以此作为吸附剂(NH2-MCM-41)来去除阴离子染料废水酸性品红(AF)。应用平衡吸附法,重点考察了溶液的pH值、吸附剂的投加量、吸附时间以及染料的初始浓度对吸附效果的影响,并采用吸附等温线和动力学模型进行吸附机理分析。实验得出:溶液的pH值对吸附效果影响较大,染料的去除率随着吸附剂质量、反应时间的增加而上升,随染料初始浓度的增加而下降。Langmuir模型对染料的等温吸附行为拟合效果最好,吸附动力学符合准二级动力学模型。解吸附研究得出NH2-MCM-41有较好的解吸附效果和重复使用率。氨基改性后的MCM-41对AF有良好的吸附效果,可以作为一种新型高效的吸附剂进一步用于阴离子染料废水治理。

MCM-41 was amine-functionalized using 3-aminopropyltrimethoxysilane and used as adsorbent(NH2-MCM-41)to adsorb anionic dye Acid Fuchsin(AF)from synthetic wastewater.The influence of solution pH,adsorbent dose,adsorption time and initial dye concentration on the adsorption effect were investigated by equilibrium adsorption method.The adsorption mechanism was discussed by adsorption isotherms and adsorption kinetics.The results showed that the solution pH had a significant influence on the adsorption effect.The removal efficiency of the studied dye increased as the adsorbent dose and reaction time increased,while decreased as the initial dye concentration increased.Langmuir model has the best fitting effect on the isothermal adsorption behavior of dyes,the adsorption kinetics fitted better with the Lagergren pseudo-second order.The results from desorption—adsorption cycles showed that NH2-MCM-41 had better desorption effect and reuse rate.NH2-MCM-41 modified by amino group had good adsorption effect on AF,and could be used as a new and efficient adsorbent for the removal of anionic dyes from synthetic effluents.