Nano materials in Water Treatment

One of the most promising and well-developed environmental applications of nanotechnology has been in water remediation and treatment where different nanomaterials can help purify water through different mechanisms including adsorption of heavy metals and other pollutants, removal and inactivation of pathogens and transformation of toxic materials into less toxic compounds It highlights the uses of nanotechnology to purify water, including separation and reactive media for water filtration, as well as nanomaterial’s and nanoparticles for use in water bioremediation and disinfection. the most extensively studied nanomaterial, zero-valent metal nanoparticles (Ag, Fe, and Zn), metal oxide nanoparticles (TiO2, ZnO, and iron oxides), carbon nanotubes (CNTs), and nanocomposites are discussed:

1. Silver Nanoparticles-Silver nanoparticles (Ag NPs) are highly toxic to microorganisms and thus have strong antibacterial effects against a wide range of microorganisms, including viruses, bacteria, and fungi. As a good antimicrobial agent, silver nanoparticles have been widely used for the disinfection of water.

2. Iron Nanoparticles-various zero-valent metal nanoparticles, such as Fe, Zn, Al, and Ni, in water pollution treatment have drawn wide research interest.  With a moderate standard reduction potential, Nano-zero-valent Fe or Zn holds good potential to act as reducing agents relative to many redox-labile contaminants. Therefore, zero-valent iron nanoparticles have been the most extensively studied zero-valent metal nanoparticles.

3. TiO2 Nanoparticles-Owing to its high photocatalytic activity, reasonable price, photo stability, and chemical and biological stability TiO2 is the most exceptional photocatalyst to date. The large band gap energy of TiO2 requires ultraviolet (UV) excitation to induce charge separation within the particles.

4. ZnO Nanoparticles-ZnO NPs are environment-friendly as they are compatible with organisms, which make them suitable for the treatment of water and wastewater. Besides, the photocatalytic capability of ZnO NPs is similar to that of TiO2 NPs because their band gap energies are almost the same.

 

  • Zero-Valent Metal Nanoparticles
  • Metal Oxides Nanoparticles
  • Adsorption & Separation
  • Antibacterial activity
  • Photocatalysis
  • Dendrimer

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