A New Approach for Analysis of Adsorption from Liquid Phase: A Critical Review

Abstract

At first, the KASRA model and KASRA equation are discussed [1][2][3]. KASRA is an abbreviation for "Kinetics of Adsorption Study in the Regions with Constant Adsorption Acceleration". The KASRA model was presented by Samiey [1] in 2013 and is based on the following assumptions: (1) each time range with constant adsorption acceleration, is named a "region", (2) there are two regions before attaining plateau region, (3) the boundaries between the first and second regions and the second and third (plateau) regions are named "starting second region" (abbreviated as ssr) and "kinetics of adsorption termination" (abbreviated as kat) points, respectively and are determined by the KASRA equation, (Figures 1-4). Due to different features of the first and second regions, parameters obtained from a kinetic equation (such as the pore-diffusion, Avrami and Elovich equations, etc.) for these two regions are different from each other and the related equations for these regions come different pathways to the point q t =0 at t=0 (or q 01 according to the KASRA model). It is good to say that KASRA is a Persian word meaning king. AbstractIn different concentration ranges of adsorbed species, various interactions occur between them and surface adsorption sites and there are different regions in an adsorption isotherm. In the common method for study of adsorption process, all of these regions are considered as one region and thus there are concerns regarding using adsorption equations. In this work, based on the KASRA and ARIAN regional models, a new method is presented for analysis of adsorption kinetic and thermodynamic data, respectively. The KASRA and ARIAN models are three-and four-region models, respectively and adsorption equations are used on the basis assumptions used in these models. According to the ARIAN model, adsorption binding constant of each region of an adsorption isotherm is different from the other regions. On the other hand, based on the kinetic KASRA model and ideal-second-order (ISO) equation, during the adsorption in each initial adsorbate concentration, different interactions occur between adsorbate species and adsorbent surface sites and thus the observed adsorption binding constant is an average value of these binding constants.

Production and Characterization of Activated Carbon from Coal for Gold Adsorption in Cyanide Solutions

“…Tests were carried out using different activated carbon loadings for the same solution. According to the Adsorption Isotherm Regional Analysis (ARIAN) model described by Abdollahi (2015), isotherms can be divided into four regions, defined by the equilibrium concentration rank. For gold adsorption tests with the waste solution, only regions I and II were identified, since the initial concentration was low.…”

GO/PAMAM as a High Capacity Adsorbent for Removal of Alizarin Red S: Selective Separation of Dyes

“…Adsorption capacity relation, adsorption experiment details, kinetic and thermodynamic equations and models used for analysis of adsorption experiments and all symbols and abbreviations were explained in detail in Supplementary Materials, Figures S5 and S6. 26,[32][33][34][35][36][37][38] 3 Results and Discussion…”

Study of Crystal Violet Hueing Dye Deposition on Fabrics During Home Laundry

“…Since most fabrics have a negatively charged surface in aqueous solution, with which positively charged dye molecules can interact strongly, these fabrics tend to be over-deposited with such dyes [20]. For crystal violet dye, the molecule takes the monovalent cation as the predominant form in aqueous solution [21].…”

“…Since Nylon and N/L-85/15 fabrics have relatively stronger negative charges than cotton and polyester fibers and crystal violet dye has a positive charge in its structure. The electrostatic interaction between a fiber and hueing dye makes the deposition of hueing dye on the nylon or N/L-85/15 fabric surface much higher [20].…”