Silica particle nanocoating removes pathogens from water
The recent report entitled Water for People – Water for Life of the World Water Assessment Programme of the UNESCO says that more than 6000 people die every day due to water-related diseases, including diarrhoea, worm infections, and infectious diseases.
In addition, organic pollutants from industrial wastewater from pulp and paper mills, textiles and leather factories, steel foundries, and petrochemicals refineries, are a major cause of illness in parts of the world where regulations do not necessarily protect people from such industrial outflows.
So the availability of drinking quality water is fast becoming a major socio-economic issue across the globe, especially in the developing world. However, water purification technology is often complicated, requires sophisticated equipment and is expensive to run and maintain. Moreover, it usually requires a final costly disinfection stage.
Now a team of scientists at the Ian Wark Research Institute at the University of South Australia are tackling this by taking a nanotechnology approach to water purification – a move that has the potential to prevent disease and poisoning from affection millions of people.
Research professor Peter Majewski and biomolecular chemist Chiu Ping Chan have investigated how silica particles can be coated easily with a nanometre-thin layer of surface active material (SAM) based on a hydrocarbon with a silicon-containing anchor. The coating is formed through a chemical self-assembly process so involves nothing more than stirring the ingredients to make the active particles.
These active particles were then tested to demonstrate that they could remove biological molecules, pathogens such as the polio virus, bacteria such as Escherichia coli, and Cryptosporidium parvum -– a waterborne parasite.
Source: engineerlive.com