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• Magnetically separable MnFe 2 O 4 nanoparticles are synthesized onto SnS 2 microflowers to fabricate a Z-scheme MnFe 2 O 4 @SnS 2 heterojunction. • The MnFe 2 O 4 @SnS 2 -2 composite photocatalyzes 92.08 % degradation of MB at 120 min under pH = 9 and 1.5 mL H 2 O 2. • MnFe 2 O 4 @SnS 2 heterojunction possesses the widened band gap and weakened luminescence. • OH is the main active specie in photo-Fenton degradation. The novel MnFe 2 O 4 /CeO 2 /SnS 2 (1:0.2:0.5, 1:0.2:1, 1:0.2:1.5) nano-photocatalysts with magnetic recyclability were prepared via a facile hydrothermal route. MnFe 2 O 4 and CeO 2 nanoparticles are decorated onto SnS 2 flowers to fabricate a MnFe 2 O 4 /CeO 2 /SnS 2 ternary heterojunction. SnS 2 is an excellent connector between MnFe 2 O 4 and CeO 2 in synthesized MnFe 2 O 4 /CeO 2 /SnS 2 composite with a suitable band gap to accelerate methylene blue (MB) of photodegradation, which is attributed to its highly efficient separation of photogenerated electron-hole pairs. Compared with pure MnFe 2 O 4 , the photo-Fenton degradation of the MnFe 2 O 4 /CeO 2 /SnS 2 composites significantly enhance in the presence of H 2 O 2. Notably, the MnFe 2 O 4 /CeO 2 /SnS 2 (1:0.2:1) composite displays a slightly decreased charge-transfer resistance and an increased photocurrent density with good cycling stability after five runs, exhibiting the excellent photocatalytic and photo-Fenton performance under simulated sunlight. Consequently, the photo-Fenton mechanism of MnFe 2 O 4 /CeO 2 /SnS 2 is explained on the basis of coexistence of Mn2+/Mn3+ and Fe3+/Fe2+ redox couples. Meanwhile, OH is the main active specie. [ABSTRACT FROM AUTHOR]