Combined Adsorption/Photocatalysis Process for the Decolorization of Acid Orange 61

  • Elhadj MekatelEmail author
  • Samira Amorkrane
  • Mohamed Trari
  • Djamel Nibou
  • Nadjib Dahdouh
  • Samir Ladjali
Research Article - Chemical Engineering


The objective of this study was to evaluate the performance of combined processes: adsorption/photodegradation of the acid orange 61. The adsorption was achieved on activated Algerian clay in batch mode. The influence of the adsorbent dose (1–6 g \({\hbox {L}}^{-1})\), initial acid orange 61 concentration (25–125 mg \({\hbox {L}}^{-1})\), pH (2–7) and temperature (293–323 K) on the adsorption of acid orange 61 has been studied. The maximum uptake was observed at pH \(\sim \) 2 for an initial concentration of 25 mg \({\hbox {L}}^{-1}\) at 293 K. The adsorption was fast with an elimination percentage of 84% within 20 min of contact time. The process is spontaneous and endothermic, and the Langmuir model is successfully applied to fit the experimental data. The coupling processes (adsorption/photocatalysis) were tested with a high efficiency. For the remaining concentrations, the removal yields reach 100% under solar light using \({\hbox {TiO}}_{2}\) as photocatalyst.


Algerian clay Acid orange 61 Adsorption \({\hbox {TiO}}_{2}\) Photodegradation Solar light 


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This work was financially supported by the Faculty of Mechanic and Engineering Process (USTHB, Algiers).


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Copyright information

© King Fahd University of Petroleum & Minerals 2018

Authors and Affiliations

  • Elhadj Mekatel
    • 1
    Email author
  • Samira Amorkrane
    • 1
  • Mohamed Trari
    • 2
  • Djamel Nibou
    • 1
  • Nadjib Dahdouh
    • 1
  • Samir Ladjali
    • 1
  1. 1.Laboratoire de Technologie des Matériaux, Faculté de Génie Mécanique et Génie des ProcédésUSTHBEl-Alia, AlgerAlgérie
  2. 2.Laboratory of Storage and Valorization of Renewable Energies, Faculty of ChemistryUSTHBEl-Allia, AlgerAlgeria

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