Adsorptive and Desorption Studies on Toxic Dye Erioglaucine Over Deoiled Mustard

Abstract

In this work, a fundamental investigation on the removal of Erioglaucine dye by deoiled mustard is conducted in batch conditions. This article incorporates effect of pH, temperature, amount of adsorbent, contact time, concentration of adsorbate, particle size on adsorption. The adsorption kinetics was shown to be pseudo-first-order. The adsorption equilibrium data can be fitted well by both Freundlich and Langmuir models. The estimated values for ΔG^o were −8.74 × 10³ and −3.691 × 10³ KJ mol⁻¹ overactivated carbon and activated deoiled mustard at 303 K (30°C), which are rather low indicating that a spontaneous processes occurred. The positive value for ΔH^o indicates that the adsorption of Erioglaucine dye to deoiled mustard is an endothermic process. Desorption studies indicate that by eluting dilute NaOH through the fixed bed of the adsorbents their columns can be regenerated and a quantitative recovery of Erioglaucine can be achieved. The percentage removal of dye was almost similar in both cases. Treated activated deoiled mustard was an attractive candidate for removing organic dye Erioglaucine which shows great reduction of color while reducing the time contact to achieve equilibrium.

Keywords:

• Adsorption
• COD
• de-oiled mustard
• desorption
• erioglaucine