Abstract
The study was designed to synthesize iron oxide-kaolinite composite to apply as a sorbent for a pre-treatment of seawater used as feed water in reverse osmosis units. Herein, we present kaolinite/Nano-sized iron oxide composite through the impregnation process. The morphologies of synthesized iron oxide and kaolinite-iron oxide nanocomposites were characterized by thermal gravimetric analysis (TGA), transmission electron microscopy (TEM), zeta potential measurement (ZPM), scanning electron microscope (SEM) and X-ray diffraction as well as FTIR. The results indicated iron oxide was well dispersed on the surface of kaolinite. Kaolinite/iron oxide composite has been found particularly useful for adsorption of scale-forming ions from seawater. The parameters controlling the uptake of the scales ions from seawater are contact time, initial ions concentration, adsorption dose, temperature, and pH. The removal efficiency reached 84% for barium under certain conditions. The adsorption follows Pseudo 2nd order with a maximum adsorbent capacity of 2.2 mg g−1. The pseudo-second order kinetic model was found to be the best model describing the process.
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