الفهرس 
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Abstract
The current work describes the synthesis and preparation of activated carbon and activated carbon iron oxide nanocomposite from rice husk.
characterization of the activated carbon, and synthesized activated carbon iron oxide nanocomposites were carried out using the FT-IR, TEM and XRD techniques which confirmed the successful preparation of the nanocomposites. Application of synthesized materials for the removal of methylene blue dye and chromium (VI) ions from wastewater through batch mode. The operational factors such as pH of solution, contact time, adsorbent dose, dye and chromium ions concentrations will be studied. the optimum pH for adsorption of MB by both RHAC and RHAC-Fe nanocomposite was 7. The optimum contact time was 60 and 10 min respectively. The optimum adsorbent dosage for adsorption of MB dye at was 3 g/L and 1 g/L by RHAC and RHAC-Fe nanocomposite. The optimum pH for adsorption of (chromium Hexavalent) by both RHAC and RHAC-Fe nanocomposite was 2, contact time for RHAC and RHAC-Fe was 180,90 min. The optimum adsorbent dosage for adsorption of chromium Hexavalent at optimum pH and contact time was 1 g/L and 0.20 g/L by RHAC and RHAC-Fe nanocomposite, respectively. The adsorption process of chromium Hexavalent by both RHAC and RHAC-Fe nanocomposite obeys the pseudo-second-order model. Freundlich isotherm was favourable for adsorption of chromium Hexavalent on the (RHAC) while the Langmuir isotherm was favourable for adsorption of chromium Hexavalent on the (RHAC-Fe).p.