Graphene for desalination

Introduction Currently, ~1.2 billion people around the world are suffering from a shortage of water and its adverse consequences on health, food and energy. On one hand, population growth, increased industrialization and greater energy needs and, on the other hand, loss of snowmelt, shrinkage of glaciers and so on will worsen this situation in upcoming years. As estimated by the world water council, the number of affected people will rise to 3.9 billion in the coming decades. One of the most promising approaches to alleviate the water shortage, desalination can increase the water supply beyond what is available from the hydrological cycle. Seawater desalination indeed provides an infinite, steady supply of high-quality water that does not harm natural freshwater ecosystems. Seawater comprises a vast supply of water (97.5% of all water on the planet). Thus, the growth of the installation of seawater desalination facilities in the past decade to circumvent water shortage problems in water-stressed countries has progressed quickly. In 2016, the global water production by desalination was estimated to be 38 billion cubic meter per year, that is, two times higher than that in 2008. So far, seawater desalination has been mainly performed via multistage flash distillation and reverse osmosis (RO). Mostly in the arid Persian Gulf countries, desalination plants perform based on heating and then condensing seawater. This kind of desalination plant consumes large amounts of thermal and electric energy, thus emitting greenhouse gases extensively.In addition to this non-economical and non-ecofriendly version of desalination plants, the main type of desalination plants constructed in the past two decades, as well as future planned ones, are based on RO technology. Graphene filters: Up to 50 percent less energy First isolated in 2003, graphene has different electrical, optical, and mechanical properties than graphite. [It`s stronger than steel, and it has unique sieving properties," Grossman says. At only an atom thick, there`s far less friction loss when you push seawater through a perforated graphene filter compared with the polyamide plastic filters that have been used for the last 50 years, he says. [We have shown that perforated graphene filters can handle the water pressures of desalination plants while offering hundreds of times better permeability," Grossman explains. [The process of pumping seawater through filters represents about half the operating costs of a desalination plant. With graphene, we could use 15 percent less energy for seawater and up to 50 percent less energy for brackish water." Another advantage is that graphene filters don`t become fouled with bio-growth at nearly the rate that occurs with polyamide filters. Desalination plants often run at reduced efficiency due to the need to frequently clean the filters. In addition, the chlorine used to clean the filters reduces the structural integrity of the polyamide, requiring frequent replacement. By comparison, graphene is resistant to the damaging effects of chlorine. According to Grossman, you could easily replace polyamide filters with graphene filters in existing plants. Like polyamide filters, graphene filters can be mounted on robust polysulfone supports, which have larger holes that sieve out particulates. Yet, significant challenges remain in bringing down costs. The Grossman Group has made good progress in creating high volumes of graphene at a reasonably low cost. A more serious challenge, however, is cost-effectively poking uniform holes in the graphene in a highly scalable manner. [A typical plant has tens of thousands of membranes, configured in two-meter long tubes, each of which has 40 square meters of rolled up active membrane," Grossman says. [We have to match that volume at the same cost, or it`s a nonstarter." Making graphene on the cheap The traditional way to make graphene - since its first isolation in 2003, mind you - is to peel it off with adhesive. [You literally take a piece of Scotch Tape to graphite and you peel," Grossman explains. [If you keep doing this, you eventually wind up with a single layer. The problem is it would take forever to peel off enough graphene for a desalination plant." Another approach is to [grow" graphene by applying super-hot gases to copper foil. [Growing graphene provides the best quality, which is why the semiconductor industry is interested in it," Grossman says. The process, however, is very expensive and energy-intensive. Instead, the Grossman Group is using a much more affordable chemical approach, which produces sufficient quality for creating desalination membranes. [Fortunately, our application doesn`t require the best quality," says Grossman. [With the chemical technique, we put graphite in a solution, and apply low temperature chemistry to break apart the entire chunk of graphite into sheets. We can get lots of graphene very cheaply and quickly." Creating pores that block salt but let water molecules pass is a steeper challenge. The reason desalination is possible in the first place is that when diffused in water, salt ions bond with water molecules, thereby creating a larger entity. But the difference in size compared to a free water molecule is still frustratingly small. [The challenge is to find the sweet spot of about 0.8 nanometers," Grossman says. [If your pores are at 1.5 nm, then both the water and salt will pass through. If they`re half a nanometer, then nothing gets through." A 0.8 nm hole is [smaller than we`ve ever been able to make in a controllable way with any other material," Grossman says. [And we need to do this over a very large area very consistently and cheaply." The Grossman Group is pursuing three techniques to make nanoporous graphene membranes, all of which use chemical and thermal energy rather than mechanical processes. [If you tried to use lithography, it would take years," Grossman says. [Our first approach involves making the holes too big, and then carefully filling them in. Another tries to make them exactly the right size, and the third involves starting with a material without holes and then carefully ripping it apart." The chemical technique for making graphene actually produces graphene oxide, which is considered undesirable for semiconductors, but is fine for filters. As a result, the researchers were able to avoid the difficult step of removing the oxygen from the graphene oxide. In fact, they found a way to use the oxygen to their advantage. [By controlling the way the oxygen is bonded to the graphene sheet, we can use chemical and thermal energy to drill the holes with the help of the oxygen," Grossman says. First target: Brackish water As the Grossman Group continues to work on the challenge of manufacturing and perforating graphene sheets, Grossman is looking to leverage other benefits of graphene filters to help bring the technology to market. Although graphene should improve efficiency with seawater and the even saltier, dirtier water used in hydraulic fracturing, it will likely debut in plants that clean brackish water, such as found in estuaries. [It turns out that higher permeability even by a factor of two or three would make a bigger difference with brackish water than with seawater," Grossman says. [You lower the energy consumption in both cases, but more so for brackish water." Graphene filters could also enable the construction of smaller, cheaper plants. [With graphene you have more choices in how you operate the plant," Grossman says. [You could apply the same pressures but get more water out, or you could operate it at lower pressures and get the same amount of water, but at a lower energy cost." Grossman notes that it can take years or even decades to site and permit a plant in heavily populated coastal areas. [A lot of effort goes into how you`re going to build the plant and where you`re going to find enough land," Grossman says. [Having the option to build a smaller plant would be a big advantage." LINA Banbury dispersion kneader for Grephene mixing and making LINA new type banbury dispersion kneader is designed to the grephene, we have the graphene department to support the machine technology.