Fruit Waste Is Ripe As Useful Materials For Water Purification Systems

In areas where access to plumbing systems are not readily available, solar stills can come in handy in purifying dirty and salty water for drinking.

Solar stills work when water is placed beneath a transparent cover, and with the heat from the sun, the liquid eventually evaporates and catches onto this cover. Once it condenses, the clean moisture filters into a separate basin for drinking. Unfortunately, this method takes a long time, and to quicken the process, scientists have found that adding materials to the water’s surface can help attract more heat from the sun.

Usually, this material consists of carbon from coal. But that calls for more mining to acquire the substance, which costs a lot and harms the environment. 

A team of scientists at Singapore’s Nanyang Technological University might have found a viable, sustainable alternative to this: fruit waste.

From the study, coconut husks, orange peels, and banana peels were heated at 1,562°F for a few hours before being mixed with a molybdenum reactant. This turned the waste into a molybdenum carbide, a type of metal from the MXene family—a group of two-dimensional inorganic compounds. MXenes generally have a very high light-to-heat conversion efficiency, making them ideal for the process.

The team found that seawater evaporated much more quickly than usual in the experiment. The newly formed material is also very porous and water can rise through it, making it a viable option that not only hastens the process but also redirects fruit waste from heading to landfills.

The NTU team is now looking for industry partners to help bring this new finding to market.

[via New Atlas and Nanyang Technological University, Photo 72782235 © Aliaksandr Mazurkevich | Dreamstime.com]