B.O.  Isiuku, M.  Horsfall, A.I.  Spiff, 
    Removal of Methyl Red from Aqueous Solution by NaOH-Activated Cassava Peels Carbon in a Fixed-Bed Column,
    Research Journal of Applied Sciences,
    Volume 9,Issue 5,
    2014,
    Pages 238-243,
    ISSN 1815-932x,
    rjasci.2014.238.243,
    (https://makhillpublications.co/view-article.php?doi=rjasci.2014.238.243)
    Abstract: The uptake of methyl red, an azo dye from aqueous solution 
  onto NaOH-activated cassava peels carbon in a fixed-bed column was studied in 
  this research. The effects of inlet dye concentration, adsorbent bed height 
  and solution flow rate were investigated. The pH of the solution was natural 
  and temperature 28-31°C. Experimental results were applied to the Thomas 
  and Yoon-Nelson Models. Results show that the experimental values of adsorption 
  capacity increased with increase in concentration, decrease in adsorbent bed 
  height and increase in flow rate. However, inlet concentration of 50 mg L<SUP>-1</SUP> 
  showed better performance for the parameters than 100 mg L<SUP>-1</SUP>. Optimum 
  adsorption capacity of 206.08 mg g<SUP>-1</SUP> was obtained at carbon bed height 
  of 20 cm, inlet concentration of 200 mg L<SUP>-1</SUP> and flow rate of 13.3 
  mL min<SUP>-1</SUP>. The trend in total removal with respect to inlet concentration, 
  bed height and flow rate was inverse to that of adsorption capacity. The maximum 
  removal of 78.62% was obtained for inlet concentration of 50 mg L<SUP>-1</SUP>, 
  carbon bed height of 30 cm and flow rate of 13.3 mL min<SUP>-1</SUP>. The experimental 
  results fitted well into the Thomas and Yoon-Nelson Models with R<SUP>2</SUP>&gt;0.90 
  generally.
    Keywords: Fixed bed column;adsorption capacity;Yoon-Nelson Models;methyl red;Thomas;cassava peels carbon