Isotherm, Thermodynamic and Kinetics Studies for Removal of Disperse Orange 25 Dye from Contaminated Water Using Adsorption on Acid-Treated Red Mud

  • G. M. RatnamalaEmail author
  • K. Vidya Shetty
  • G. Srinikethan
Conference paper


Sulphuric acid treated red mud has been utilized for removal of Disperse Orange 25 (DO25) dye from dye contaminated water to investigate its potential as a low cost adsorbent. The activation with concentrated sulphuric acid has increased the surface area of red mud from 20.2 to 32.28 m2/g. The effect of contact time, initial pH, initial dye concentration, temperature and red mud dosage on percentage adsorption of dye using acid treated red mud was investigated. Acidic pH of 4 favoured adsorption and 120 min contact time was found to be suitable for attainment of equilibrium conditions. Langmuir isotherm model has been found to represent the equilibrium data for DO25-red mud adsorption system better in comparison with Freundlich isotherm model. The adsorption capacity of activated red mud was found to increase with the increase in temperature and at 40 °C, it was found to be 127 mg dye/g of activated red mud. Thermodynamic analysis showed that adsorption of DO25 on acid-treated red mud is an endothermic process with ΔHoof 67 kJ/mol. The adsorption kinetics was represented by second-order kinetic model and the kinetic constant was estimated to be 0.00102 g/mg min.


Adsorption Isotherm Kinetics Red mud Disperse orange 25 


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Copyright information

© Springer Science+Business Media Singapore 2016

Authors and Affiliations

  • G. M. Ratnamala
    • 1
    • 2
    Email author
  • K. Vidya Shetty
    • 2
  • G. Srinikethan
    • 2
  1. 1.Department of Chemical EngineeringKLE Dr M S Sheshagiri College of Engineering and TechnologyBelgaumIndia
  2. 2.Department of Chemical EngineeringNational Institute of Technology Karnataka Srinivasnagar PostSurathkalIndia

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