Sobhy M.  Yakout, Ashraf A.  Mostafa, 
    Removal of Nitrite from Aqueous Solution by Active Carbon: Adsorption Kinetics Modeling,
    Journal of Animal and Veterinary Advances,
    Volume 13,Issue 9,
    2014,
    Pages 558-563,
    ISSN 1680-5593,
    javaa.2014.558.563,
    (https://makhillpublications.co/view-article.php?doi=javaa.2014.558.563)
    Abstract: Nitrite is formed naturally by the nitrogen cycle during the process of nitrogen 
  fixation in vertebrates, nitrate is converted to nitrite and other metabolites 
  (nitric oxide and N-nitroso compounds). Overall, the acute toxicity of nitrite 
  has been shown to be ~10 fold higher than that of nitrate. In this study, KMnO<SUB>4 
  </SUB>oxidized Rice straw activated carbon has been used for nitrite removal 
  from aqueous solution. Both unoxidized and oxidized carbon samples are characterized 
  using N<SUB>2</SUB>-adsorption, elemental analysis, Boehm&#146;s titration and 
  surface fractal dimension. Results show that oxidation treatment enhanced surface 
  area and pore volume. The modified carbon good nitrite adsorption compared to 
  unoxidized one. The equilibrium was attained after shaking for about 10 h beyond 
  which there is no further increase in the adsorption. The pseudo first and second 
  order kinetic models were applied assuming that the external mass transfer can 
  be neglected and the process is chemisorption controlled.
    Keywords: Adsorption;Rice straw;nitrite;active carbon;treatment