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Removal, preconcentration and determination of Mo(VI) from water and wastewater samples using maghemite nanoparticles by Abbas Afkhami; Rasoul Norooz-Asl is a Materials Science article available to read on EtoBox.

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Removal and recovery of Mo(VI) from aqueous solutions were investigated using maghemite (␥-Fe 2 O 3 ) nanoparticles. Combination of nanoparticle adsorption and magnetic separation was used to the removal and recovery of Mo(VI) from water and wastewater solutions. The nanoscale maghemite with mean diameter of 50 nm was synthesized by reduction coprecipitation method followed by aeration oxidation. Various factors influencing the adsorption of Mo(VI), e.g. pH, temperature, initial concentration, and coexisting common ions were studied. Adsorption reached equilibrium within <10 min and was independent of initial concentration of Mo(VI). Studies were performed at different pH values to find out the pH at which maximum adsorption occurred. The maximum adsorption occurred at pHs between 4.0 and 6.0. The Langmuir adsorption capacity (q max ) was found to be 33.4 mg Mo(VI)/g of the adsorbent. The results showed that nanoparticle (␥-Fe 2 O 3 ) is suitable for the removal of Mo(VI), as molybdate, from water and wastewater samples. The adsorbed Mo(VI) was then desorbed and determined spectrophotometrically using bromopyrogallol red as a complexation reagent. This allows the determination of M

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Author

Abbas Afkhami; Rasoul Norooz-Asl

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0927-7757)

Published

2009

Language

EN

Field

Materials Science (Physical Sciences)