The present research work deals with utilization of Hibiscus sabdariffa stem as an adsorbent for the removal of RhB dyes from the aqueous solutions. The effect of contact time, initial dye concentration, dose of sorbent, chloride ions and pH were considered. Adsorption isotherm data were tested with using Langmuir and Freundlich modes and the adsorption follows both models. The kinetic studies made with pseudo second order, Elovich model and intra- particle diffusion model. Thermodynamic parameters such as ∆H0, ∆S0 and ∆G0 were evaluated which indicated that the adsorption was follows spontaneous and endothermic nature.
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