Bisorption of Rhodamine-B dye by native and acid- activated orange peel as low-cost adsorbent

Abstract

In this work, the removal of Rhodamine-B dye from aqueous solutions by adsorption on native and activated carbon prepared by chemical activation using HNO3 for orange peel was examined. The results showed that activating the activation and carbonization of the adsorbents rises the existence of carbon pores. The adsorption experiments were done by using several rates of initial pH, adsorbent dosage, contact time and initial concentration of the adsorbate for the raw and activated adsorbent. The greatest percentage removal of Rhodamine-B dye by orange peel (OP) and activated orange peel (AOP) was found to be 84% and 98% respectively. Langmuir and Freundlich isotherms were used to study the equilibrium results. The experimental results fitted good to the Freundlich isotherm. The results established that both (OP) and (AOP) was highly effective as adsorbents in the removal of Rhodamine-B dye.