Zeolites and humankind – N. Lygeros, G. Hatzigeorgiou

Natural zeolites are formed when volcanic rocks and layers of ash react with alkaline groundwater. They are microporous, clay-silicate minerals which are commonly used as commercial adsorbents. Natural zeolites can even be used in cases of water and soil contamination following a nuclear accident. Notably, clinoptilolite was used in 1986, by the Russian government to absorb radioactive chemicals and other harmful toxins following the Chernobyl disaster. People showed a 30 per cent reduction in radioactive isotopes following the first application of zeolite. In Great Britain, it is used to remove caesium-137 and strontium-90 from radioactive waste. In a pilot study, the filtration of 3 m³ of contaminated groundwater in western Thessaloniki was investigated – the removal of arsenic and fluoride proved highly effective. Other applications directly related to human activity are as follows.

Medicine:

• As a dietary supplement.
• Increases energy levels and improves the absorption of nutrients by the digestive tract.
• Acts as a natural isotonic solution.
• It binds toxins and heavy metals released during fat burning, thereby preventing them from entering the body.
• It binds and eliminates harmful substances that enter the body via food, water and air.
• As buffering agents to reduce the acidity of stomach contents.
• For the treatment of stomach ulcers.
• To accelerate wound healing.
• Binds mycotoxins to form stable complexes.
• Increases antioxidant levels in the body.
• Binds to free radicals in the body.
• Helps to alkalise the pH.
• Relieves muscle pain caused by lactic acid.
• Reduces fungal infections of the feet.
• Neutralises the effects of hepatitis viruses.
• Stabilises and regulates the immune system.
• Reduces the side effects of chemotherapy and radiotherapy.
• In the manufacture of anti-diarrhoeal medicinal products.
• In the manufacture of preparations for lowering cholesterol levels.
• As carriers for the sustained release of pharmaceutical substances.
• As materials for the binding and removal of ammonium ions in haemodialysis machines.
• As filters in anaesthetic machines.
• In dentistry, they are used in the production of filling materials and as polishing agents in fluoride toothpastes.

Fish farming:

• It filters the water and absorbs ammonia.
• For the removal of heavy metals.
• To increase oxygen levels in aerated fish farm waters and in tanks used for transporting live fish.

N. Lygeros, G. Hatzigeorgiou

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