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Gold from trash

30.06.2020

Scientists from the Korea Advanced Institute of Technology have developed a polymer that allows the extraction of rare and precious metals from chips and circuit boards of electronic devices for their reuse. The new organic compound is called porphyrin and is a substance with many tiny pores that are capable of trapping atoms of rare and precious metals.

In accordance with the technology, electronic waste is first dissolved in acid, after which a new polymer is added to the resulting solution.

During the experiments, it turned out that gold turned out to be the most susceptible to the polymer: in 30 minutes, using this method, up to 94% of this metal in solution can be returned. This is 10 times more than in the case of other metals, in particular, platinum.

In this case, the polymer can be used repeatedly, even after it has already collected gold in a previous reaction with acid.

According to the developers, one gram of the new substance costs $5, while the cost of gold extracted with it reaches $64. Moreover, as the cost of gold mining is reused, it will decrease.

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solar chimney 06.05.2020

Developed by scientists from the Royal Melbourne Institute of Technology, a solar chimney can save up to 50% of electricity, and also help save the lives of homeowners in a fire.

Approximately 19% of the world's energy resources are used for heating, ventilation and cooling of buildings, the authors of the study write. Installing solar chimneys will reduce energy costs for heating by 50%.

A solar chimney is a passive solar heating and cooling system that uses natural ventilation to control the temperature in a building. Modern solar chimneys consist of a glass wall placed against a black painted wall. This design maximizes the absorption of solar energy.

The vents on the top and bottom of the mechanism control the air flow inside and outside the chimney for heating or cooling. When the sun heats up the chimney, it also heats up the air inside it.

A solar chimney allows carbon dioxide to be drawn out during a fire, as well as fresh air being brought into the building.

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