Adsorptive Removal
of Brilliant green dye from wastewater using activated CETP sludge
Yadav A., Malviya R. and Dwivedi M.K.
Res. J. Chem. Environ.; Vol. 29(3); 26-38;
doi: https://doi.org/10.25303/293rjce026038; (2025)
Abstract
Brilliant Green, a synthetic and toxic dye, is used for dyeing various materials
such as paper, leather, wool and silk. This study demonstrates the efficacy of an
adsorbent derived from CETP sludge for the removal of Brilliant Green dye from wastewater.
Activated sludge was characterised using SEM, XRF, FTIR and BET techniques. Several
parameters including the contact time, pH, adsorbent dose, initial dye concentration
and temperature were optimised to assess their impact on dye adsorption. The maximum
removal efficiency of Brilliant green dye reached 98.50% within 120 minutes at a
concentration of 20 mg/l, pH 5.0 and 0.1 g adsorbent dose at temperature 30°C.
Experimental data fitted well with the pseudo 2nd order kinetic model. Experimental
isotherm study employing the Langmuir, Freundlich, Temkin and R-P isotherm models
revealed that the Freundlich adsorption isotherm model best fitted the adsorption
of Brilliant Green dye. The thermodynamic parameters such as ΔG°, ΔH° and ΔS° were
studied and the adsorption was found to be spontaneous and endothermic in nature.
These results suggested the significant potential of activated CETP sludge for the
removal of dyes from wastewater.
