Theoretical Evaluation Of Adsorption Desalination Performance of Metal-Organic Frameworks Under Varying Senarios

Abstract

Adsorption desalination systems (ADs) driven by low-grade energy are regarded as sustainable alternatives to address water shortages due to their low energy consumption. Adsorbents is the key materials for the performance of ADs. Metal-organic frameworks (MOFs) are one of the most potential adsorbents due to their ultrahigh water uptake. In this work, a numerical study was performed to assess the water production performance of ADs based on MOFs and other adsorbents under different working conditions. It is found that MOFs outperform other adsorbents owing to their high water transfer amount per cycle under various conditions. The trends in specific daily water production (SDWP) and performance ratio(PR) with hot and chilled water temperature are closely correlated with the adsorption characteristics, i.e., water uptake and the shape of adsorption isotherms. Moreover, considering both SDWP and PR, DUT-67 are the most potential candidates that is applicable to various working conditions, followed by MIL-100(Fe) and Al-fumarate. This work provides helpful insights the correlation between desalination performance and water adsorption characteristics of adsorbents under varying working conditions,which favors choosing and designing of potential adsorbents for ADs.

Keywords: adsorption characteristics, adsorption isotherms, water production, performance ratio