期刊
ENERGY REPORTS
卷 8, 期 -, 页码 3115-3126出版社
ELSEVIER
DOI: 10.1016/j.egyr.2022.02.010
关键词
Supported materials; Freshwater production; Sorption; Solar energy; Semi-desert; Desert areas
资金
- UNINNOVA project: Call for projects to strengthen innovation at the Universidad Nacional from the development of prototypes and pilot experiences 2019/2021 [49192]
- project Strategy of transformation of the Colombian energy sector in the horizon 2030 by call 788 of Minciencias Scientific Ecosystem [FP44842-210-2018]
Water production from air dehumidification using silica-based supported materials was studied in two climate zones in Colombia. The results showed that the material synthesized based on a hygroscopic CaCl2 salt supported on silica has high sorption capacity and efficiency. The study also demonstrated the feasibility of producing water in challenging environments, making a positive social impact.
Water is a vital liquid for developing biological, industrial, and social processes. However, by 2020, the availability of drinking water decreased by 20% worldwide, leaving more than 2 billion people without access to high-quality water. Thus, this work was based on freshwater production from air dehumidification using silica-based supported materials in two climate zones in Colombia to deal with this lack of water. The results showed that the material synthesized based on a hygroscopic CaCl2 salt supported on silica (SHS) has a high sorption capacity and efficiency even after ten sorption/desorption cycles. The obtained water isotherms had the same tendency for 20, 30, 40, and 60 degrees C, showing type II behavior based on the International Union of Pure and Applied Chemistry (IUPAC) classifications from 2015. A sorption capacity of 0.85 g.g(-1) for a relative humidity of 84% was obtained. Based on the thermodynamic properties of sorption, the process is defined as spontaneous and exothermic. For the field tests, simple equipment was designed for water sorption/capture during the night, while the desorption/condensation process occurs during the day. The exclusive use of solar energy generated productivity above 0.6 g.g(-1) in the environmental conditions of Santa Fe-Antioquia and the Tatacoa desert in Colombia. The relative humidity was less than 80% during the entire test. The desorption temperature was lower than 40 degrees C, which shows the high capacity of the SHS to produce water in semi-desert conditions at low temperatures. Thus, this SHS can produce water in challenging environments, generating a positive social impact by providing fresh water to those communities that need it most. (C) 2022 The Author(s). Published by Elsevier Ltd.
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