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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.
Removal of environmental nanoparticles (NPs) by porous material filtration is one of the most important methods for air purification treatment.In this paper, three kinds of mesoporous molecular sieves (MCM-41, SBA-15) and ordered mesoporous carbons A typical mesoporous material was used to remove NPs from 2 to 20 nm in order to explore the feasibility and theoretical basis of mesoporous materials for NPs filtration.Based on the results of physical and chemical properties of three kinds of mesoporous materials, This experiment found that the most pore size of mesoporous material channels and a certain amount of mesopores are the key to the adsorption of NPs, while the micropore distribution has little contribution to the removal of NPs.Furthermore, the effects of SBA-15 at different flow rates and particle bed thickness The removal of NPs was analyzed and it was found that the most penetrating particle size (MPPS) of nanoparticles decreased with the increase of flow rate, and the removal efficiency of MPPS particles decreased at the same time, and the MPPS basic Not affected by the change of particle bed thickness.This study provided a technical basis for filtration and removal of NPs by mesoporous materials.