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Three-dimensional (3D) hierarchical magnetic hollow sphere-like CuFe2O4 (3D HMHS-CuFe2O4) were designed to sensitively detect four Sudan dyes combined with HPLC–DAD. The formation mechanism of 3D HMHS-CuFe2O4 is also discussed. Compared to the particle-like CuFe2O4 (PL-CuFe2O4), the as-obtained 3D HMHS-CuFe2O4 provided a higher extraction efficiency for the four Sudan dyes (I, II, III and IV) due...
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