Adsorptive Removal of Congo Red, a Carcinogenic Textile Dye, from Aqueous Solutions by Maghemite Nanoparticles

The adsorption of Congo red (CR) onto maghemite nanoparticles (J-Fe2O3), and itsdesorption was investigated. The adsorption capacity was evaluated using both the Langmuir and Freundlich adsorption isotherm models. Maghemite nanoparticles (J- Fe2O3) were prepared easily in a surfactant-less microemulsion, by co-precipitation method. The size of the produced maghemite nanoparticles was determined by X-ray diffraction (XRD) analysis and scanning electron microscopy (SEM). Synthesized maghemite nanoparticles showed the highest adsorption capacities of CR compared to many other adsorbents and would be a good method to increase adsorption efficiency for the removal of CR in a wastewater treatment process. The maximum adsorption occurred at pH 5.9. The Langmuir adsorption capacity (qmax) was found to be 208.33 mg/g of the adsorbent.

کلیدواژه ها:

Congo red adsorption ، Maghemite nanoparticles ، Waste water samples