Journal
DESALINATION AND WATER TREATMENT
Volume 52, Issue 10-12, Pages 2282-2292Publisher
DESALINATION PUBL
DOI: 10.1080/19443994.2013.822324
Keywords
Phosphate ions; Sorption; Manganese oxide; Kinetic modeling; Thermodynamic parameters
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Funding
- Tunisian Chemical Group (SIAPE)
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Manganese-oxide-coated sand (MOCS) and manganese-oxide-coated crushed brick (MOCB) were characterized and employed for the removal of phosphorus ions () from aqueous solution. Scanning electron microscope (SEM), FTIR, X-ray diffraction spectrum (XRD), and BET analyses were used to study the surface properties of the sorbents. Sorption of from aqueous solutions was investigated by batch experiments. The estimated optimum pH of phosphorus ions retention for the considered sorbents was 5. Both Freundlich and Langmuir isotherms may reasonably explain adsorption of phosphorus ions. The adsorption capacities of coated sorbents obtained at pH 5 and 20 degrees C were 1.96 and 2.08 mg/g for MOCS and MOCB, respectively. The sorption kinetics were tested for pseudo-first order and pseudo-second order reactions as well as for intraparticle diffusion model and the rate constants of the three kinetic models were calculated. The best correlation coefficients were obtained using the pseudo-second-order kinetic model, indicating that uptake process followed the pseudo-second order rate expression. Results from this study suggest that manganese-oxide-coated sorbent is potentially suitable to remove PO43- from water.
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