Analysis of Selected Methods Use for Calculation of the Coefficients of Adsorption Isotherms and Simplified Equations of Adsorption Dynamics with the Use of IZO Application

Abstract

The purpose of this paper is to present the IZO application that calculates and visualizes coefficients of adsorption isotherms according to Freundlich, Langmuir, and BET in a classic and linear system, in a simple communicative way. The application also calculates the working time of the adsorption bed based on the transformation of the mass balance equation, and according to the Zuchowicki, Zabieziński, Tichonow, and the Bohart-Adams equations. The laboratory tests of the adsorption process of leachate from a municipal landfill on selected active coals ORGANOSORB 10, DESOTEK, and BA-10, were conducted to check the program for accuracy. Results of tests confirm that the linearization method of the calculation of adsorption isotherms coefficients, used in the IZO application, gives sufficient accuracy and may be used as an alternative of, e.g., the nonlinear estimation method.

Mechanism of Oxytetracycline Removal by Coconut Shell Biochar Loaded with Nano-Zero-Valent Iron

“…The supernatant was filtered by a 0.22 μm filter membrane, and ultraviolet spectrometry was used to determine the concentration of OTC solution; the experiment was repeated three times to average. The experimental results were fitted by the pseudo-first-order dynamics model [ 36 ], pseudo-second-order dynamics model [ 37 ], and intra-particle diffusion model [ 38 , 39 , 40 ]. where t is the adsorption time, min; q t and q e are the adsorption capacities at t and equilibrium, respectively, mg·g −1 , mg·g −1 ; K 1 , K 2 , and K 3 are, respectively, the pseudo-first-order, pseudo-second-order, and intra-particle diffusion dynamics rate constants, g·mg −1 ·h −1 , g·mg −1 ·h −1 , and g·mg −1 ·h −0.5 .…”

Application of an Adsorption Process on Selected Materials, Including Waste, as a Barrier to the Pesticide Penetration into the Environment

“…For low values, it is proportional to the equilibrium concentration. In contrast, it is parallel to the ordinate axis for high values, proving that the surface has reached the state of saturation [20,24].…”

“…In turn, the adsorption dynamics is a combination of statics, kinetics, and the mass balance equations of the adsorbate. Different types of adsorption isotherms apply to different theories of adsorption [19][20][21][22][23][24].…”

“…In such conditions, the adsorbent surface is saturated. Therefore, the Freundlich isotherm is applicable for average equilibrium concentration values, coinciding with the Langmuir isotherm [20,24].…”

“…When the adsorbate molecule hits the occupied spot on the adsorbent surface, it creates adsorption complexes. In addition, as the solute concentration increases, the number of unoccupied active sites decreases, and adsorbate molecules may create further adsorption layers [20,24].…”