有序介孔材料过滤脱除纳米颗粒物

Removing Nano Particles by Filtration Using Materials with Ordered Mesoporous Structure

多孔材料过滤去除环境纳米颗粒物（nanoparticles,NPs）是空气净化治理的重要方法之一.本文采用介孔分子筛（MCM-41、SBA-15）和有序介孔碳（CMK-3）这3种典型介孔材料对2-20 nm的NPs进行过滤脱除研究,旨在探索介孔材料在NPs过滤方面的应用可行性与相关理论基础.基于3种介孔材料的物理化学性质表征结果,通过本实验发现介孔材料孔道的最可几孔径以及一定量的介孔孔容是吸附NPs的关键,而微孔分布对去除NPs贡献不大.进一步对SBA-15在不同流量及不同颗粒床厚度下对NPs的去除进行了分析,发现纳米颗粒物的最易穿透粒径（most penetrating particle size,MPPS）随着流量的增大而减小,同时MPPS颗粒物的去除效率随之降低,且MPPS基本不受颗粒床厚度变化的影响.本研究为介孔材料过滤脱除NPs提供了技术依据.

The usage of porous materials to remove Nano Particles（ Nanoparticles,NPs） is one of the critical ways to purify the air.The present study employed three typical mesoporous structures,CMK-3,SBA-15 and MCM-41 to conduct removal experiments,in which NPs were generated,ranging from 2 nm to 20 nm,aiming at exploring the practical feasibility and relative theory foundation about the filtration of mesoporous structures towards NPs. Based on the physical and chemical characterization of the three mesoporous structures above,coupled with the adsorption experiments,the results acquired indicated that the most probable pore size of mesoporous structures coupled with certain mesoporous capacity of a mesoporous structure are the key to remove NPs. However,the distribution of micropore contributed hardly to the removal of NPs. Based on this,exploration was made to observe the effect that different flow rates and thicknesses had on the efficiency of NPs removal. The consequences showed that most penetrating particle size（ MPPS） of NPs decreased with the increase of flow rates. Meanwhile,the corresponding removal efficiency of MPPS decreased. Furthermore,MPPS did not change with the change of thicknesses. This study provided technical evidence for the removal of NPs on mesoporous structures.