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Encapsulation of Vanadium Phosphorus Oxide into TiO2 Matrix for Selective Adsorption of Methylene Blue from Aqueous Solution

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journal contribution
posted on 27.09.2018, 20:43 by Zahra Akbari, Mehran Ghiaci, Fahime Nezampour
Vanadium phosphorus oxide (VPO) has been embedded in a titania matrix. The adsorption capacity of the VPO­(5–30 wt %)@TiO2 composites and VPO alone for the removal of harmful cationic and anionic dyes such as methylene blue (MB), rhodamine B (RhB), and methyl orange (MO) have been extensively investigated. The FT-IR, XRD, TGA, FE-SEM, EDX, and BET techniques were applied for characterization of the adsorbents. Batch-adsorption experiments demonstrated that the VPO­(30 wt %)@TiO2 as the best composite selectively removes MB with more than 94% removal efficiency. The adsorption behavior of the MB on the VPO­(5–30 wt %)@TiO2 composites was investigated with variations in the mass of sorbent, initial dye concentration, solution pH, temperature, and contact time. Kinetic experiments demonstrated that the pseudo-second order kinetic model showed the best fit with the adsorption data. The efficiency of the VPO­(30 wt %)@TiO2 as the preferred composite remained unchanged after five adsorption cycles, and could be regenerated easily by simple washing with NaOH (0.1 mol/L) and water.