Abstract
The industrial wastewater produced by hexamine plants is considered as a major environmental polluting factor, and hence its treatment is required. The adsorption of hexamine from aqueous solutions onto activated carbon modified with magnetic iron oxide nanoparticles (AC-MIONs) was studied in a batch process. Langmuir, Freundlich, and Toth isotherm models were used to fit the experimental data and then isotherm parameters were determined. The effects of activated carbon and AC-MIONs amounts, solution pH, contact time, temperature, and electrolyte concentration on the adsorption capacity were studied. The results indicate that AC-MIONs were a more efficient adsorbent for hexamine than activated carbon and have potential for the adsorption of hexamine from industrial hexamine wastewater. Pseudo-first order rate equation was able to provide realistic description of adsorption kinetics. The rate of adsorption process on AC-MIONs is higher than that on AC. Desorption of hexamine from AC-MIONs is easier than AC. Therefore, the AC-MIONs can be a good reusable and economical sorbent.
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