Adsorptive Removal of Rhodamine B Dye from Aqueous Solutions Using Mineral Materials as Low-Cost Adsorbents

Abstract In this work, the potential adsorption abilities of mineral materials such as zeolite (Ze), halloysite (Ha), chalcedonite (Ch), and Devonian sand (DS) used low-cost resources for removal Rhodamine B (RhB) from aqueous solutions were investigated in batch conditions. Adsorption kinetics equilibrium effect solution reaction (pH) studied. kinetic data analyzed using two models: pseudo-first-order pseudo-second-order models. was better represented by model. Equilibrium Freundlich, Langmuir, Sips isotherms. The results show that fit well with Freundlich equilibrium. Monolayer maximum capacities RhB assumed at 6.964, 4.252, 2.701, 0.349 mg/g Ze, Ha, Ch, DS, respectively. strongly pH-dependent. on all tested observed pH = 2.2 decreased further increase. these investigations suggest natural certain minerals have a good solutions. Graphical