ABSTRACT

Nano Adsorbents ............................................................................ 92 2.3 Basic Models for PSD Calculating from Data of Simulated

Adsorption Isotherms ................................................................... 100 Keywords .............................................................................................. 140

2.1 INTRODUCTION

Finding a reliable, accurate, and flexible method for the determination of PSD of porous adsorbents still remains an important concern in the area of characterization of porous materials. Although a large number of researches have been done in this area, some constraints such as type of adsorbate, adsorbent characteristics, adsorption temperature, applicable range of pore size, and range of relative pressure limit the applicability of each model in all cases. The lack of such method is tangible by rapid development of new porous materials and their wide applications in various fields. In this chapter, the following three well-known models were used in order to obtain PSD for two series of chemically activated carbons and the results are compared. It is increasingly common to study adsorption processes, whether on free surfaces or in confirmed spaces such as pores by modeling or simulation techniques. The reach aim of these studies is frequently to develop an understanding that will better enable adsorption measurements to be used to characterize various adsorbents in terms of their surface properties or pores structure. Modeling and simulation methods include: Grand Canonical Monte Carlo (GCMC), density functional theory (DFT), LJ potential, BJH, Novel Algorithms method such ASA, Varlet, SHN, HK and IHK method, DR method, DS method (Stoeckeli method), etc. [121, 161].