We successfully prepared the TiO2@Mn-Zn ferrite composite powder for magnetic photocatalyst. The core Mn-Zn ferrite powder was synthesized by using steel pickling liquor and used alkaline batteries as the starting materials. The shell TiO2 nanocrystal was prepared by sol–gel hydrolysis precipitation of titanium isopropoxide (Ti(OC3H7)4) on the Mn-Zn ferrite powder. The thickness of the titania shell was found to be approximately 2 nm. The core of Mn-Zn ferrite is of spherical or elliptical shape and the particle size of the core is in the range of 20–40 nm. The magnetic Mn-Zn ferrite nanopowder is uniformly encapsulated in a titania layer forming the core–shell structure of TiO2@Mn-Zn ferrite powder. The magnetic photocatalyst can be successfully used to treat dye waste waters.
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The authors would like to thank the National Science Council of Taiwan for financially supporting this research under Contract No. NSC 101-2918-I-259-005.