Arsenate and phosphate removal from water using Fe-sericite composite beads in batch and fixed-bed systems

摘要: Abstract Natural sericite clay was modified with iron-oxide and then the encapsulated into beads by employing ionic gelation method to obtain Fe-sericite composite beads. The materials were fully characterized N2 adsorption–desorption isotherm, SEM-EDX, XRD, FT-IR XPS analyses. Batch experiments showed that a high uptake of As(V) phosphate within wide range pH maximum sorption capacity determined Langmuir isotherm found be 5.780 4.446 mg/g for phosphate, respectively. kinetic data indicate at least 12 h contact time is necessary attain equilibrium intra-particle diffusion plays significant role in process. presence background electrolyte (NaNO3) or other heavy metals ions could not significantly affect As(V)/phosphate Furthermore, fixed-bed column experiment has demonstrated remove up acceptable level breakthrough volume even under dynamic conditions. analysis results successful it assumed these two pollutants formed an inner sphere complexes iron oxide present