NPE在有序介孔炭上的吸附行为研究

采用有序介孔硅为硬模板制备了具有不同孔径的有序介孔炭(OMCs). 氮气吸附测试表明, 有序介孔炭具有丰富的介孔表面和集中的介孔分布. 以壬基酚聚氧乙烯醚(NPE)为探针分子, 研究了大分子酚类在有序介孔炭上的吸附行为. 吸附研究表明, NPE在有序介孔炭上的吸附满足Langmuir吸附模型. 孔结构分析表明, 大于1.5 nm的孔的表面积是决定NPE吸附量的关键因素, 而有序介孔炭的最可几孔径决定吸附速率的大小. 与吸附量相比, 吸附速率更容易受环境温度的影响. 动力学研究表明, NPE在有序介孔炭上的吸附满足准二级动力学方程.

Adsorption Behavior of NPE on Ordered Mesoporous Carbons

Ordered mesoporous carbons (OMC) with varying pore sizes were synthesized using ordered mesoporous silica SBA-15 as hard templates. N2 adsorption tests show that the synthesized OMCs possess abundant mesopores with a centralized mesopore distribution. Nonylphenol ethoxylate (NPE) was used as a probe molecule to investigate its adsorption behavior on OMC. As evidenced by adsorption tests, the isotherms of NPE on OMC could be well simulated by a Langmuir adsorption model. The surface area of a pore larger than 1.5 nm, was found to be a crucial factor for the adsorption capacity of NPE, while the most probable pore diameter of OMC was found to be vital to the adsorption rate of NPE. Results also show that adsorption temperature has larger effects on adsorption rate than adsorption capacity. Theoretical studies show that the adsorption kinetics of NPE on OMC can be well depicted by using a pseudo-second-order kinetic model.