Chemical absorption in surface chemistry

Chemical absorption is a process where one substance (the absorbate) is taken up by another substance (the absorbent) through a chemical reaction. Unlike physical absorption, which involves only the physical interaction of molecules, chemical absorption entails a change in the chemical structure of the absorbate, leading to the formation of new compounds.

In this process, molecules of the absorbate react with the absorbent, often resulting in a more stable or less volatile form. This is commonly observed in gas absorption, where gases react with liquids or solids. For example, carbon dioxide can be absorbed in aqueous solutions of sodium hydroxide, forming sodium carbonate.

Chemical absorption is widely used in various industries, including air pollution control, where it helps remove harmful gases from emissions, and in the production of chemicals, where specific reactants are captured and transformed into desired products. The efficiency of chemical absorption depends on factors such as temperature, pressure, concentration, and the specific nature of the absorbent and absorbate involved.

1. Chemical absorption Chemical absorption University of zakho Faculty of science Department of chemistry Prepared by: fanar fawaz Supervisor: Dr. farhad M.Ali

2. Introduction Chemical Absorption Example of chemical absorption: Chemical absorption, reasons: Table of contents

3. Introduction In chemistry, absorption can refer to the process in which one substance is taken up by another. For example, a sponge absorbing water is a common example of absorption in chemistry.

4. It is an absorption process in which a chemical reaction occurs between the molecules of absorbate and absorbent . Chemical Absorption

5. Chemical Absorption of CO2 Enhanced by Solutions of Alkali Hydroxides and Alkoxides at Room Temperature Example of chemical absorption:

6. Chemical absorption, reasons: 1- This can happen if the chemical is soluble in the material or if there are chemical reactions taking place at the interface. 2- when a material has a high surface area , providing more opportunities for the chemical to come into contact and be absorbed. 3- the concentration of the chemical can influence absorption, as higher concentrations can drive more absorption.

7. Referenses "Chemical Engineering Volume 2: Particle Technology and Separation Processes" by J. M. Coulson and J. F. Richardson. "Transport Processes and Separation Process Principles" by Christie John Geankoplis . "Chemical Process Equipment: Selection and Design" by Stanley M. Walas .