Removal of heavy metal from aqueous solution using multi-walled carbon nanotubes

There are some disadvantages for traditional physicochemical methods to treat cadmium-polluted wastewater, such as expensive cost, low efficiency, labor-intensive operation, or lack of selectivity in the treating process. Scientists are paying much attention to searching the substitutable materials, which can enhance the removal efficiency and reduce the treatment cost. Furthermore, the large specific surface areas, as well as the high chemical and thermal stabilities, make carbon nanotubes an attractive adsorbent in wastewater treatment too. The adsorption properties of the carbon nanotubes to cadmium have been studied and the results show that carbon nanotubes are excellent and effective adsorbent for eliminating these harmful media in water. In this work the surface modification and functionalization of carbon nanotubes (CNTs) were investigated. CNTs were firstly treated by acid mixture H2SO4/HNO3 to introduce the carboxylic group onto the surface of CNTs. This carboxylic group was used as reaction precursor in the functionalization. The functionalized CNTs were characterized by Fourier transform infrared (FTIR) spectroscopy, Raman spectroscopy and transmission electron microscopy (TEM) methods.

کلیدواژه های Removal of heavy metal from aqueous solution using multi-walled carbon nanotubes:

Cadmium ، Carbon nanotube ، wastewater ، RSM