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The binary flower-like BiOI/CoFe 2 O 4 photocatalysts with magnetic retrievability were successfully synthesized via coprecipitation method. The effects of composite ratio on the microstructure, morphology, optical, photo-electrochemical and photocatalytic properties of the samples were studied. The experimental results show that BiOI/CoFe 2 O 4 nanocomposites contain tetragonal structure BiOI and cubic spinel structure CoFe 2 O 4 with good crystallization. Spherical CoFe 2 O 4 nanoparticles are uniformly decorated on the surface of BiOI nanosheets to establish hierarchical flower-like 3D- BiOI/CoF 2 O 4 heterojunctions. BiOI/CoFe 2 O 4 nanocomposites show excellent visible light absorption ability. PL spectra show the intensity decrease for BiOI/CoFe 2 O 4 nanocomposites. BiOI/CoFe 2 O 4 nanocomposites can promote the separation of photon-generated carriers, improve the migration efficiency, and improve the redox activity of nanocomposites. BiOI/CoFe 2 O 4 nanocomposites exhibit better photocatalytic activity during the process of degrading the RhB dye solution under the irradiation of simulated visible light. The degradation efficiency of BiOI/CFO-3 photocatalysts is 80.24% after 3 cycles, and exhibit better recyclable stability. Also, ·O 2 − is the main reactive species in the degradation process, which plays a crucial role in the RhB degradation. Image 1 • The binary flower-like BiOI/CoFe 2 O 4 photocatalysts with magnetic retrievability were synthesized via coprecipitation method. • BiOI/CoFe 2 O 4 nanocomposites show excellent visible light absorption ability. • BiOI/CoFe 2 O 4 nanocomposites accelerate the separation and migration efficiency of carriers, and improve the redox activity. • BiOI/CFO -3 samples have the best photocatalytic performance, and the degradation efficiency is 80.24% after 3 cycles. [ABSTRACT FROM AUTHOR]

• 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]

Ag2S quantum dots were dispersed on the surface of SnS2 nanoflowers forming a heterojunction via in-situ ion exchange to improve photocatalytic degradation of RhB. All samples exhibit the hexagonal wurtzite structure. The size of Ag2S@SnS2 composites are ~ 1.5 μm flower-like with good crystallinity. Meanwhile, the Eg of 3% Ag2S@SnS2 is close to that of pure SnS2. Consequently, the 3% Ag2S@SnS2 composite displays the excellent photocatalytic performance under simulated sunlight irradiation with good cycling stability, compared to the pure SnS2 and other composites. Due to the blue and yellow luminescence quenching, the photogenerated electrons and holes is effectively separated in the 3% Ag2S@SnS2 sample. Especially, the hydroxyl radicals and photogenerated holes are main active species. [ABSTRACT FROM AUTHOR]