G.P.  Kofa, G.J.  Kayem, S. Ndi  Koungou, R.  Kamga, 
    Kinetics and Adsorption Isotherms of Arsenic (V) onto Natural Pozzolan,
    Journal of Engineering and Applied Sciences,
    Volume 8,Issue 4,
    2013,
    Pages 97-103,
    ISSN 1816-949x,
    jeasci.2013.97.103,
    (https://makhillpublications.co/view-article.php?doi=jeasci.2013.97.103)
    Abstract: Adsorption of arsenic (V) from aqueous solutions onto natural 
  pozzolan from Djoungo was studied. Experiments were carried out in batch as 
  a function of contact time and pH at a frequency of 7 Hz. Results showed that 
  adsorption equilibrium onto pozzolan was attained in 20 min at the pH studied 
  and kinetics followed a pseudo-second-order model. The experimental isotherm 
  data were analyzed using Freundlich, Langmuir and Redlich-Peterson isotherm 
  equations. In order to determine the best-fit isotherm for each system, non-linear 
  regressions were carried out. For this, Chi-square error was used to evaluate 
  the data. The errors values indicated that the Redlich-Peterson isotherm was 
  able to provide best quality fit for all the experimental data.
    Keywords: equilibrium;non-linear;pozzolan;adsorption;Arsenic (V)