Adsorptive removal of fluoride ions from aqueous solution by using sonochemically synthesized nanomagnesia/alumina adsorbents: An experimental and modeling study

作者：Nazari Mahdi; Halladj Rouein^*

来源：Journal of the Taiwan Institute of Chemical Engineers, 2014, 45(5): 2518-2525.

DOI：10.1016/j.jtice.2014.05.020

• Defluoridation
• Sonochemical
• Nanomagnesia/alumina adsorbent
• Isotherms
• Kinetics

Wet impregnation followed by sonochemical approach was applied to dope gamma-Al2O3 with MgO nanocrystals in order to synthesize a new and more efficient fluoride nanosorbent (4-30 nm). The effects of operating conditions such as pH, fluoride concentration, contact time and dosage were studied. The adsorbents were characterized by using the pHzpc measurement and FTIR, HR-SEM, XRD, EDAX, and BET analyses. The optimum fluoride removal (%26gt;85%), adsorption capacity of similar to 5.6 mg/g, was obtained at 140 min, neutral pH range of 6.3-7.3, and adsorbent dosage of 0.5 g/L. The isomorphic substitution of OH- of brucite in the nanosorbent with fluoride ions could be herein the dominant sorption mechanism. Furthermore, other ions (CI-, SO42-, HCO3-, PO43-) in the solution had very little interference in the fluoride adsorption. However, PO43- was the greatest competitor for fluoride adsorption. Finally, the experimental adsorption equilibrium and kinetic data were closely followed the Langmuir adsorption isotherm and pseudo second order kinetic model respectively.

• 出版日期2014-9