Scientists have created a sponge extraction of gold from wastewater

Swiss scientists from the Federal Polytechnic School of Lausanne (EPFL) created a porous material that is able to quickly extract residual gold from sea, fresh, wastewater, as well as precipitation and complex solutions.

The invention consists of a material that received the name FE-BTC / PPPDA, a metallological frame and polymer structural blocks. Due to the porous structure, the sponge has a very large area of the inner surface, which allows it to absorb the amount of gold equal to its own mass. At the same time, it ignores other metals and connections.

Scientists tested the development in difficult conditions and samples of liquids. Tests showed that in just 2 minutes the sponge is able to remove gold from river, sea, wastewater and solutions obtained from electronics waste. After completing the absorption of precious metal, the material can be easily destroyed, leaving behind 23.9-carat gold, out of 24 possible. Today, this is the maximum purity rate for this method of extraction.

In the world, 190 thousand tons of gold were produced in the world, which can be represented as a cube with parties 20 m. In addition to using luxury and state reserves, the metal is indispensable in electronics. However, due to the reduction in the production and growth of consumption in production, it led to the fact that the European Union recognized by Aurum a scarce resource. The researchers also calculated that only the Swiss sewer system is washed off for about 1.5 million euros annually.

The developers have already started to cooperate with the local waterproof station. Currently, the Group studies new organometallic polymer composites to extract different contaminants and other valuable elements from water.

Scientists from the University of Pittsburgh also presented