By Sophia Arnao, Staff Writer and Researcher for Save The Water™ | April 17, 2016
Imagine a substance so thin that it’s considered two-dimensional. It may seem like something out of a science fiction novel, but it’s real—and it’s changing the face of water purification technology as we know it.
This miracle material, graphene, is essentially a single layer of carbon atoms packed together in a hexagonal lattice structure, or “honeycomb” shapes (as shown above). At only one atom thick, it is the thinnest compound and lightest material.
Despite the fact that it naturally repels water, graphene allows water – and only water- to pass through it when small pores are made in the sheet. In the past, scientists have created filters out of graphene that successfully purified water. However, the delicate properties and high cost of the material only allowed the filters to be made on a small scale.
Recently, a new breakthrough was made in graphene-based water treatment when a research team at Monash University and University of Kentucky created a viscous form of graphene oxide that can be spread with a blade. It is also able to withstand harsh environments for extended periods of time. This, along with the capability for faster production, makes these filters valuable for a variety of larger-scale commercial applications.
This filter is still likely just the beginning of graphene technology, but already a wide variety of applications can be imagined. One main use would be in desalination, which would allow seawater to be turned into tap water. This would be a major advance in mitigating water shortages worldwide, as most of the Earth’s water is found in oceans. Other uses could be for uses other than consumption, such as treating industrial wastewater or public utility water so it could be reused. If adapted, the filter could even purify other liquids, such as wine or milk.
As an organization that is involved in raising public awareness about issues related to water contamination, Save the Water™ can help educate people about the potential for graphene to be used in water filters. Informing more people about it may inspire more scientists to start working to apply these filters in the real world.
Graphenea. (n.d.). “Graphene – What Is It?” Retrieved from http://www.graphenea.com/pages/graphene#.VvhAYBIrJE4.
Graphenea. (n.d.). “Graphene Applications & Uses.” Retrieved from http://www.graphenea.com/pages/graphene-uses-applications#.VvhCOxIrJE4.
Graphene-info. (n.d.) “Graphene and water treatment: introduction and market status.” Retrieved from http://www.graphene-info.com/graphene-water-treatment.
Phys.org. (2016). “Revolutionary graphene filter could solve water crisis.” Retrieved from http://phys.org/news/2016-03-revolutionary-graphene-filter-crisis.html.
Abozar Akbari et al. Large-area graphene-based nanofiltration membranes by shear alignment of discotic nematic liquid crystals of graphene oxide, Nature Communications (2016). DOI: 10.1038/ncomms10891.
Xylem Inc. (n.d.). “From Water Reuse to Water Desalination, Treating Water the World Around.” Retrieved from http://www.xylem.com/en-us/applications/water-treatment/Pages/default.aspx.
Gao, W., Majumder, M., Alemany, L. B., Narayanan, T. N., Ibarra, M. A., Pradhan, B. K., & Ajayan, P. M. (n.d). “Engineered Graphite Oxide Materials for Application in Water Purification.” Retrieved from http://www.ludiserv.com/zenos/docu/Engineered%20Graphite%20Oxide%20Materials%20for%20Application%20in%20Water%20Purification.pdf.