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

Malak Kahloul (), Selim Mahfoudhi, Jalila Chekir and Amor Hafiane
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Malak Kahloul: University Tunis - El Manar
Selim Mahfoudhi: Membrane and Environmental Biotechnology, (LEMBE)
Jalila Chekir: Membrane and Environmental Biotechnology, (LEMBE)
Amor Hafiane: Membrane and Environmental Biotechnology, (LEMBE)

Environment, Development and Sustainability: A Multidisciplinary Approach to the Theory and Practice of Sustainable Development, 2020, vol. 22, issue 5, No 39, 4655-4672

Abstract: 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

Keywords: Ultrafiltration membrane; Complexation; Spectrophotometric study; Heptamolybdate; Toluidine blue (search for similar items in EconPapers)
Date: 2020
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DOI: 10.1007/s10668-019-00402-8

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