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At present, most common catalysts are faced with the problem of high cost and only visible light response. Graphitic carbon nitride (g-C 3 N 4) consists of elements C and N that are sufficiently abundant in the world and has visible light responses, but the electron-hole recombination rate of this photocatalyst is high. In this work, we directly prepare a series of g-C 3 N 4 -bismuth oxyhalides composites via facile in-situ deposition. Bismuth oxides with different chloro-iodine ratios (BiOCl x I 1-x) are prepared, followed by g-C 3 N 4 deposition, setting up interfaces and improving photogenic charge carriers transfer. By testing the compositions, Cl:I = 8:2 in BiOCl x I 1-x and 10% of g-C 3 N 4 doping amount enable the best photocatalytic performance of the samples. Under visible light irradiation, the degradation rate of rhodamine B (RhB) reaches 99% within 40 min. Through a variety of tests, the photogenerated hole (h+) and superoxide radical (•O 2 −) are found to play key roles in the degradation process. Cl element doping and heterojunction building improve the photocatalysis capacity of g-C 3 N 4 and broaden the visible-light response of pure BiOI. [ABSTRACT FROM AUTHOR]

In this work, Bi 4 O 5 I 2 -Bi 2 O 2 CO 3 -BiOCl 0.8 I 0.2 n-p-n heterojunction was synthesized by in-situ growth method. Different types of BiOX (X = Br, Cl and I) materials were combined to optimize the charge separation of prepared heterogeneous junction so as to improve the photocatalytic performance. It had been proved by various characterization methods that the charge carrier recombination would be greatly suppressed under the action of internal electric field at the interface when n-p-n heterojunction was formed. Specially, 20-Bi 4 O 5 I 2 -Bi 2 O 2 CO 3 -BiOCl 0.8 I 0.2 presented the best photocatalytic performance, which could degrade 99% of Rhodamine B (RhB) in 60 min under 500 W Xe lamp source. BiOCl 0.8 I 0.2 improves the performance of photocatalytic and broaden the light absorption range of pure BiOI. This work provides a new perspective to design ternary structures that enhance photocatalytic performance. [Display omitted] [ABSTRACT FROM AUTHOR]

MoS 2 /TiO 2 based nanocomposites exhibit great prospect in the area of photocatalysis and rechargeable batteries. However, many efforts have to be made to avoid the agglomeration of MoS 2 on TiO 2 nanobelts, to increase the interfacial bonding between MoS 2 and TiO 2 , and to utilize the inert basal surface of 2H–MoS 2. Herein, we report the TiO 2 /Ag/MoS 2 /Ag nanocomposites with double Ag loadings by hydrothermal method combined with the Tollen reaction. The as-obtained nanocomposites possess excellent photocatalytic performance to Cr (Ⅵ) and RhB, which is ascribed to the fast transfer and effective separation of charge carriers due to the formation of heterojunction between TiO 2 /Ag/MoS 2 and MoS 2 /Ag. The present study illustrates the potential application of these analogous multiphase nanocomposites for water purification. [ABSTRACT FROM AUTHOR]