Abstract
Conjugated polyvinyl alcohol derivative (CPVA)/ZnFe2O4 nanocomposite was synthesized by a simple liquid-solid phase mixing and thermal dehydration/conjugation method. The CPVA/ZnFe2O4 nanocomposite showed not only stronger photocatalytic activity than ZnFe2O4 nanoparticles and previously reported MgFe2O4/CPVC and ZnFe2O4/CPVC photocatalysts (specifically, the photocatalytic activity of CPVA/ZnFe2O4 was 3 times that of ZnFe2O4, and 300 mg CPVA/ZnFe2O4 can achieve almost complete reduction of the Cr(VI) in 300 mL 50 mg/L K2Cr2O7 aqueous solution after 300 min visible-light irradiation), but also remarkable reuse performance in the visible-light-activated reduction of aqueous Cr(VI). Furthermore, the CPVA/ZnFe2O4 nanocomposite can be separated from the solution by magnetic attraction. The elevated photocatalytic activity of CPVA/ZnFe2O4 nanocomposite was experimentally found to be due to its more efficient transfer and separation of photo-induced charges. The proposed modification of ZnFe2O4 using CPVA is effective, economical, and environmental friendly, and the CPVA/ZnFe2O4 nanocomposite photocatalyst has potential in utilizing sunlight for treating Cr(VI)-polluted water.
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