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Interaction of toluidine blue dye with heptamolybdate: UV–visible and ultrafiltration study

Author

Listed:
  • Malak Kahloul

    (University Tunis - El Manar
    Membrane and Environmental Biotechnology, (LEMBE))

  • Selim Mahfoudhi

    (Membrane and Environmental Biotechnology, (LEMBE))

  • Jalila Chekir

    (Membrane and Environmental Biotechnology, (LEMBE))

  • Amor Hafiane

    (Membrane and Environmental Biotechnology, (LEMBE))

Abstract

The present work represents the first attempt to apply a polyoxometalates (POMs) type heptamolybdate [Mo7O24]6− as a complexing agent for the removal of toluidine blue (TB) dye by ultrafiltration. Before ultrafiltration study, the interaction between heptamolybdate and dye was investigated using spectrophotometry UV–visible. It was shown that a metachromatic complex dye/POMs type 1:6 was formed with a blue shift from 623 to 550 nm indicating the formation of dye H-aggregates. The ultrafiltration process shows that the addition of heptamolybdate to dye solution greatly improved TB retention from 10 to 97%. The heptamolybdate concentration (0–1 mM), NaCl concentration (0.001–1500 mM), CTAB concentration (0.001–10 mM), pH (2–12) and applied pressure ∆P (2–4 bar) on the dye retention and permeate flux have been investigated. A 25 full factorial design shows that the main influenced factors are CTAB surfactant following by heptamolybdate and salt concentrations. Graphic abstract Schematic of the process of TB removal by PAUF method

Suggested Citation

  • Malak Kahloul & Selim Mahfoudhi & Jalila Chekir & Amor Hafiane, 2020. "Interaction of toluidine blue dye with heptamolybdate: UV–visible and ultrafiltration study," Environment, Development and Sustainability: A Multidisciplinary Approach to the Theory and Practice of Sustainable Development, Springer, vol. 22(5), pages 4655-4672, June.
    • Handle: RePEc:spr:endesu:v:22:y:2020:i:5:d:10.1007_s10668-019-00402-8
    DOI: 10.1007/s10668-019-00402-8
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