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N-K 2 Ti 4 O 9 /g-C 3 N 4 /UiO-66 ternary composites were successfully synthesized by a solvothermal method, and were characterized by powder X-ray diffraction, UV–vis diffuse reflectance spectroscopy, the valence band X-ray photoelectron spectroscopy, field emission transmission electron microscopy, photoluminescence emission spectra and N 2 adsorption-desorption. Photocatalytic activities of N-K 2 Ti 4 O 9 , g-C 3 N 4 , UiO-66, N-K 2 Ti 4 O 9 /g-C 3 N 4 binary composites and the ternary composites were investigated by the degradation of Rhodamine B (RhB) under visible light irradiation. The results show that the ternary composites exhibit higher photocatalytic activity as compared with the binary composites and the pure materials. The synergistically enhanced photocatalytic activity of the ternary composites is due to coupling direct solid-state Z-scheme N-K 2 Ti 4 O 9 /g-C 3 N 4 heterojunction with high adsorption capacity of UiO-66 for RhB.

In the present study, MIL-101(Cr) and Bi25FeO40 were successfully synthesized by hydrothermal method, and were wrapped by polythiophene (PTH) to form a new composite catalyst, Bi25FeO40/MIL-101/PTH. The pure materials and composite were fully characterized by X-ray diffraction, transmission electron microscopy and UV–vis spectrophotometer. Moreover, the photocatalytic activities of the catalysts were evaluated by measuring the degradation of Rhodamine B under visible light. The results show that the composites exhibit better photocatalytic activities than pure materials and P25, which can be ascribed to the big adsorption capacity of MIL-101(Cr) and the rapid transferring and separation of photogenerated charge carriers through PTH connected interface between MIL-101(Cr) and Bi25FeO40.