STUDY OF KINETIC, ISOTHERMAL, AND SORPTION CHARACTERISTICS OF SOME DYES USING NOVEL LUPINE PEEL POWDER

Synthetic dyes are considered harmful compounds to the environment even in slight quantities. Low-cost natural adsorbents have been proven helpful for water treatment. In the current research, Lupine peel was used in inactivated (IL) and activated (AL) forms to remove Basic Fuchsin (BF) and Eosin (E) dyes from aqueous media. Adsorbents have been evaluated by FTIR and SEM. The operational settings, including the solutions pH, adsorbent dosage & size, initial dye concentration, temperature & contact time were all controlled in a batch system. According to experimental outcomes, the adsorption procedure occurs quickly & naturally. A pseudo-2^nd-order kinetic model gives the best fit to the experimental information of BF & E dyes adsorption onto IL and AL. Adsorption isotherm data of BF adsorption was fitted well to the Freundlich model, while E adsorption was well fitted to the Langmuir adsorption isotherm. Optimal adsorption capacities of 1.5344, 2.9913, 0.7983, and 1.0921 mg/g for BF and E adsorption onto IL and AL respectively. According to the (D-R) isotherm model, the values of E were 0.5, 2.357, 0.05, and 0.0707 KJ/mol for BF and E onto IL and AL respectively, indicating a physisorption process. The activation parameters (∆G^o, ∆H^o, ∆S^o) were calculated. The adsorption was endothermic and spontaneous with a higher preference of BF than E onto AL and IL. The findings indicate that the lupine peel has the potential to function as a low-cost adsorbent for the elimination of BF & E dyes from aqueous solutions.