Presenting Discussions About Atmospheric Water Harvesting

In a review article recently published in the journal ACS Materials Au, researchers discussed the recent developments in atmospheric water harvesting materials.

Study: Recent Development of Atmospheric Water Harvesting Materials: A Review. Image Credit: Bianca Grueneberg/Shutterstock.com

Background

All life on Earth depends on water to exist and persist. 2.8 billion people in 48 nations throughout the world are currently concerned about the lack of freshwater due to geographic and climatic restrictions, and based on plausible projections, the impacted population could increase to 4 billion. Therefore, the development of next-generation technologies for freshwater harvesting that are affordable, have a high water adsorption capacity, and are simple to install and use is regarded as a possible solution to this global problem. 

Currently, water conservation methods in deserts or wastelands typically require high investments, high maintenance costs and/or high operating costs, high environmental impacts, inflexible installation, and time-consuming and seasonal intermittent water supplies. Technologies for passive water production have received a lot of attention recently because they do not use additional energy. Chemically created atmospheric water harvesting (AWH) materials have gained more popularity recently.

About the Study

In this study, the authors highlighted the recent advancements in functional materials for passive atmospheric water harvesting applications with a focus on the structure-property relationship (SPR) to demonstrate the transport mechanism of water capture and release. They talked about the technological difficulties in using water harvesting materials in real-world applications, such as low adaptation in severe environments, self-desorption, low capacity under low humidity, and inadequate solar-thermal conversion. They also offered interesting viewpoints on the creation of materials for atmospheric water collection.

The team concentrated on the research results of passive technologies for atmospheric (gaseous) water harvesting over the last ten years and presented an in-depth analysis of the most advanced materials from a materials chemistry standpoint.

The researchers illustrated that these substances are separated into two groups based on the degree of water saturation. The first group consisted of structured surfaces that were used to collect saturated atmospheric water, and the second group consisted of metal-organic frameworks (MOFs), ionic liquids (ILs), hygroscopic inorganic compounds (HICs) and derivatives, and functional hydrogels which were used to capture unsaturated vapor and produce water. They also discussed future perspectives and prospective optimization measures that could further boost water production efficiency and fulfill the demands of an energy-sustainable and carbon-neutral economy.

Observations

Under UV irradiation, the composite hydrogel made of MIL-101(Cr) loaded with Au nanoparticles had an average water release efficiency of 93%. The relatively low binding energy in the range of 8-200 kJ/mol, compared to a typical intramolecular bond of 200-1000 kJ/mol, made the bond simple to break when the temperature was increased over 37 °C.

Composite hydrogels assisted by HIC had the highest water adsorption capacity of 5.4 g g-1. The resulting carbon nanotube (CNT)[email protected] rod displayed a broad ultraviolet-visible (UV-vis)- near-infrared (NIR) absorption range and a high capacity for water adsorption of 1.15 g g-1 at 25 °C and 80% RH. The hydrogen bonding energy between water molecules and the IL pair gradually dropped with an increase in the adsorption capacity of water molecules, from 93.64 kJ mol-1 to 53.99 kJ mol-1.

The carbon sphere could desorb water with an astounding 91.3% effectiveness in just one hour. When the relative humidity was 90%, MOF-801 had a water adsorption capacity of 0.4 g of water per g of dry MOF and 0.28 g g-1 when the relative humidity was 20%. The materials made of polydimethylsiloxane (PDMS) and alginate that were 3D printed had the highest saturated water collection rate of 39.24 L m-2 h-1.

Under ideal circumstances, the current high-efficiency AWH materials could generate 6.5 kg of freshwater per day from 1 kg of hydrogel, which was enough to satisfy the daily water needs of three humans without using any more energy. As a result, these materials were fiercely competitive in the freshwater harvesting industry.

Conclusions

In conclusion, this study examined the recent developments in materials chemistry for applications involving the capture of air and water. The new AWH materials required no external mechanical equipment or external energy sources, in contrast to conventional freshwater collecting techniques, including long-distance water delivery, reverse osmosis in membrane seawater desalination and power-based active condensation devices.

The authors mentioned that since AWH materials have a wide range of applications, the technology based on them will significantly contribute to reducing the scarcity of freshwater resources in arid or water-scarce locations in the near future.

More from AZoM: How Can Polymer Strips Be Used to Clean Up Oil Spills?

Source

Feng, A., Akther, N., Duan, X., et al. (2022) Recent Development of Atmospheric Water Harvesting Materials: A Review. ACS Materials Au. https://pubs.acs.org/doi/10.1021/acsmaterialsau.2c00027

Disclaimer: The views expressed here are those of the author expressed in their private capacity and do not necessarily represent the views of AZoM.com Limited T/A AZoNetwork the owner and operator of this website. This disclaimer forms part of the Terms and conditions of use of this website.

Surbhi Jain

Written by

Surbhi Jain

Surbhi Jain is a freelance Technical writer based in Delhi, India. She holds a Ph.D. in Physics from the University of Delhi and has participated in several scientific, cultural, and sports events. Her academic background is in Material Science research with a specialization in the development of optical devices and sensors. She has extensive experience in content writing, editing, experimental data analysis, and project management and has published 7 research papers in Scopus-indexed journals and filed 2 Indian patents based on her research work. She is passionate about reading, writing, research, and technology, and enjoys cooking, acting, gardening, and sports.

Citations

Please use one of the following formats to cite this article in your essay, paper or report:

  • APA

    Jain, Surbhi. (2022, August 08). Presenting Discussions About Atmospheric Water Harvesting. AZoM. Retrieved on October 02, 2022 from https://www.azom.com/news.aspx?newsID=59736.

  • MLA

    Jain, Surbhi. "Presenting Discussions About Atmospheric Water Harvesting". AZoM. 02 October 2022. <https://www.azom.com/news.aspx?newsID=59736>.

  • Chicago

    Jain, Surbhi. "Presenting Discussions About Atmospheric Water Harvesting". AZoM. https://www.azom.com/news.aspx?newsID=59736. (accessed October 02, 2022).

  • Harvard

    Jain, Surbhi. 2022. Presenting Discussions About Atmospheric Water Harvesting. AZoM, viewed 02 October 2022, https://www.azom.com/news.aspx?newsID=59736.

Tell Us What You Think

Do you have a review, update or anything you would like to add to this news story?

Leave your feedback
Your comment type
Submit