Co(Il) Adsorption in Aqueous Media by a Synthetic Fe-Mn Binary Oxide Adsorbent

摘要

Co(Ⅱ) adsorption on high-purity amorphous Fe-Mn binary oxide adsorbent was investigated. The Co(Ⅱ) adsorption behavior of this synthetic material was studied and discussed as a function of contact time, pH and initial concentration. The Langmuir and Freundlich isotherm models were applied to fit the Co (Ⅱ) adsorption data on Fe-Mn binary oxide with mes-oporous particles of irregular surface morphology and a specific surface area of 201.8 m~2 g~(-1) with a maximum capacity of 32.25 mg g~(-1) Various kinetic models applied to the adsorption rate data of the Co(Ⅱ) ion were evaluated. The results show that the pseudo-second order and the intra-particle mass transfer diffusion models correlated best with the experimental rate data. The adsorption activation energy was found to be 9.07 kJ mol~(-1) indicating that it corresponds to a physical adsorption. The evaluated thermodynamics parameters of the adsorption values indicated the en-dothermic and spontaneous nature of the adsorption. The results obtained confirmed that Fe-Mn binary oxide had the potential to be utilized as a low-cost and relatively effective adsorbent for Co(Ⅱ) removal from wastewater.