Investigations on a dye desorption from modified biomass by using a low-cost eluent: hysteresis and mechanisms exploration

  • A. A. Azzaz
  • S. JellaliEmail author
  • Z. Bengharez
  • L. Bousselmi
  • H. Akrout
Original Paper


Methylene blue (MB) desorption from alkali-treated orange tree sawdust (ATOS) adsorbent was investigated under different experimental conditions. For an initial MB adsorbed amount of 63.78 mg g−1 and an initial aqueous pH of 6.0, the experimental data showed that MB desorption is time dependent and increases with NaCl concentration. A maximal desorption yield of 65% was reached after 120 min for a 1 M NaCl concentration. These experimental data were successfully fitted by the pseudo-second-order kinetic model (R2 ≈ 1 and APE < 1.155%), indicating that MB desorption mechanism involved mainly an ion exchange process between liquid and solid phases. Moreover, the effect of initially adsorbed dye concentration on MB desorption efficiency was apprehended for five successive desorption steps. The experimental results showed that MB release in the bulk solution followed a non-singular adsorption/desorption isotherm that become more intense with the increase in the initially retained dye amounts onto ATOS. The theoretical required number of MB desorption steps for a total regeneration of ATOS noticeably decreased from 575 when using distilled water to only 50 steps with NaCl aqueous solutions (0.5 M) as desorbing eluent. FTIR analysis showed the involvement of the hydroxyl and carboxylic functional groups in the sorption process. Ionic chromatography analysis presented a decrease in the aqueous solution concentration in Na+ and Cl ions by 46% and 48%, respectively, which emphasizes on their migration onto the solid phase. These results confirmed that MB desorption is most likely driven by a cationic exchange mechanism between dye molecules and sodium ions.


Modified sawdust Dye Desorption Sodium chloride Hysteresis 



This research work has been carried out in the framework of a Tunisian national project. Financial support of this work by the Tunisian Ministry of Higher Education and Scientific Research is gratefully acknowledged. Authors are also grateful to Dr M. Jeguirim for checking English phrasing of the manuscript.

Compliance with ethical standards

Conflict of interest

The author declares that they have no conflict of interest.


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Copyright information

© Islamic Azad University (IAU) 2018

Authors and Affiliations

  • A. A. Azzaz
    • 1
    • 2
  • S. Jellali
    • 1
    Email author
  • Z. Bengharez
    • 3
  • L. Bousselmi
    • 1
  • H. Akrout
    • 1
  1. 1.Wastewaters and Environment LaboratoryWater Research and Technologies Centre (CERTE)SolimanTunisia
  2. 2.Faculty of Sciences of BizerteUniversity of CarthageJarzounaTunisia
  3. 3.Laboratory of Advanced Materials and Physicochemistry for Environment and Health, Faculty of Exact SciencesDjillali Liabes UniversitySidi Bel AbbèsAlgeria

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