The use of nanotechnology in water purification


30/07/2010

Nanotechnology involves using a wide variety of tools, techniques and technologies, which are composed of particles whose size is approximately several hundred nanometers in diameter. Particles of this size have unique physical, chemical and surface properties that make them up new possibilities to use. In fact, advocates of nanotechnology are reminded that this area of research could assist the decisions of some of the major challenges that we face on a global level, such as, for example, ensuring the supply of safe drinking water for the growing population, or by solving important questions in medicine, energy, and agriculture. By publishing the analysis of research in the International Journal of Nuclear Desalination (International Journal of Nuclear Desalination), scientists of India (DJ Sanghvi College of Engineering) explain that in nanotechnology, there are several methods of water purification that have recently been opened, and some of them are already in use. "Water treatment devices, which include Nanolayer materials are already available, and at the same time, the growing human need for clean water increases," - explains the scientist Alpay Mahapatra (Alpana Mahapatra) and colleagues Farida Valli and Karishma Tijoriwala. Purification of water by applying nanotechnology means nanoscale materials, such as carbon nanotubes and fibers of alumina for nanofilters. This is possible thanks to the existence of nanoscopic pores in the membrane filters of zeolites, as well as nanocatalysts and magnetic nanoparticles. Nanosensors, such as those that are the basis of a nanowire of titanium oxide or palladium nanoparticles used for analytical detection of pollutants in aqueous solutions. Results of water purification using nanotechnology depends on the degree of contamination - has added a group of scientists. It can be used to remove sediments and chemical industry waste, charged particles, bacteria and other pathogenic elements. Scientists attribute this to the fact that traces of toxic elements such as, for example, arsenic, and viscous liquid impurities such as oil can be removed using nanotechnology. "The main advantages of the use of nanofilters, compared with standard samples that less pressure is required to pass the water through the filter, they are more efficient and they have a large effective surface area, and serves the same easier to clean compared to conventional methods," - According to a team of scientists. For example, carbon nanotubes membranes can remove almost all the types of contaminants in the water including turbidity, oil, bacteria, viruses, and organic pollutants. Although the pores of carbon nanotubes is much less, however, they have the same or better capacity than standard materials with large pores, possibly because of the smooth structure of nanotubes. Nanofibres filters of aluminum and other materials removed from nanofibres negatively charged contaminants, such as viruses, bacteria, organic and inorganic colloids, and much faster than conventional filters. "As long as the present generation nanofilters can be relatively simple, likely that future generations of nanotechnology in water purification devices will benefit from the properties of new materials nanolayer" - says a group of scientists. The researchers point out that several fundamental aspects of nanotechnology have raised concerns among the public and activist groups. They admit that the threats associated with nanomaterials may not be the same as the threats associated with the usual options of materials known as a much larger volume and surface volume ratio of nanoparticles can make them more reactive than conventional materials and leads to yet unknown and untested interactions with biological surfaces. Water purification based on nanotechnology has not hurt human health and does not lead to environmental problems, but the opinion of a group of scientists coincides with many others in that it is necessary to advance the study of biological interactions of nanoparticles and work in this direction should be carried out. The popular news portal talk about what’s going on in the world.

Original: Physorg.com Translation: M. Potter


Magnesium - super material of the future
Quantum mechanics has become visible to the naked eye
Russian aeromodellers created a model of a giant balloon
Rats, cyborgs can perceive infrared light
Physicists potassium could lower the temperature below absolute zero