Evaluation of the Adsorptive Process on Adsorbent Surfaces as a Function of Pressure in an Isosteric System Compared with Adsorption Isotherm

Abstract

The developing significance of adsorption has brought about a steadily expanding quantity of logical and innovative writing on different adsorbents. This paper intends to propose experimental and computational methods for measuring the strength of adsorbate–solid interactions. It primarily focuses on the use of graphs to measure the effectiveness of an adsorbate’s bonds with the solid adsorbent by determining the isosteric heat. The Clausius–Clapeyron model equation is used to determine the isosteric enthalpy of adsorption from two adsorption isotherms at various but close temperatures, with ΔT of 10 °C. A full computational explanation of the Clausius–Clapeyron model equation for determining ΔHads is provided using experimental data. Logarithmic plots of uptakes vs. p in the low-pressure zone for the Freundlich–Langmuir graph are used to assess and confirm the quality of the crucial underlying isotherms. The isosteric heat was found to be between 13.5 kJ/mol and 16 kJ/mol.

Recyclable 3D-Printed Composite Hydrogel Containing Rice Husk Biochar for Organic Contaminants Adsorption in Tap Water

“…The selection of appropriate isotherm models aids in understanding how the adsorbate molecules interact with the adsorbent evaluates the practical application of the adsorption process. 60 In this study, Langmuir (eq 15), Freundlich (eq 16), and Temkin (eq 17) isotherm models were used to analyze the experimental data. These isotherm models express the relationship between the amount of IBU and MB adsorbed on the hydrogels and their equilibrium concentrations in tap water.…”

“…In addition to the kinetic analysis, adsorption isotherm models were employed to describe the interaction of IBU and MB with Alg and Alg/Biochar10 hydrogels. The selection of appropriate isotherm models aids in understanding how the adsorbate molecules interact with the adsorbent and evaluates the practical application of the adsorption process . In this study, Langmuir (eq ), Freundlich (eq ), and Temkin (eq ) isotherm models were used to analyze the experimental data.…”

Grand Canonical Monte Carlo Simulation Experiences of Methane and Ethane Adsorption Behaviors on Simplified Organic Shale Formed by Graphene Layering

“…When the adsorbent surface is highly homogeneous and the interaction between adsorbate particles is negligible, the total adsorbate loading becomes the determining factor for calculating the isosteric heat. However, in cases where the adsorbent is completely heterogeneous, the isosteric heat can be dependent on the total adsorbate loading . To bridge the gap between computational data and experimental results, researchers utilized different reproduced wall thicknesses to assess the level of adsorbent heterogeneity in shale nanopores and the interactions inside those nanopores.…”

“…For the adsorption of methane and ethane particles on a graphene surface, 55 an interesting observation is that the isosteric heat of adsorption typically increases as the surface coverage of methane and ethane on the graphene surface increases, indicating a stronger interaction between methane particles and the graphene surface with higher surface coverage. Calculating the isosteric heat of adsorption includes utilizing adsorption isotherms, 56 which describe the amount of gas adsorbed on the surface as a function of pressure at a constant temperature. By fitting these isotherms to appropriate models such as the Langmuir or BET model, the isosteric heat of adsorption precisely determines.…”

“…However, in cases where the adsorbent is completely heterogeneous, the isosteric heat can be dependent on the total adsorbate loading. 56 To bridge the gap between computational data and experimental results, researchers utilized different reproduced wall thicknesses to assess the level of adsorbent heterogeneity in shale nanopores and the interactions inside those nanopores. Determining the Q st can be accomplished either by direct experimental measurement using calorimetry or indirectly by analyzing changes in the adsorption isotherms with temperature.…”