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Adsorption water vapor characteristics on modified silica gel for desalination application

Energy, freshwater, and the environment are interrelated factors that permeate all our activities on the earth. They have become the most important and popular topics in research fields nowadays. This paper studies improving the performance of the adsorption desalination system by improving a commercial silica gel as an adsorbent. Acid treatment has been used to activation for the silica gel. Then, a composite adsorbent is prepared chem-ically using silica gel as a host matrix and impregnated in CaCl 2 salt hydrate. Water vapor adsorption isotherm and kinetics are investigated for raw, treated, and composite silica gel. The Dubinin-Astakhov (D-A) and linear driving force models (LDF) have fitted experimental isotherm and kinetic results. The system is driven by renewable energy such as solar energy. The results illustrated that the silica gel/CaCl 2 achieved water uptake (0.95 kg H2O /kg). It is also observed that the composite silica gel based-adsorption desalination cycle provides specific