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Graphitic carbon nitride (g-C 3 N 4) faces limitations in photocatalytic application due to its limited light response and high recombination rate of photo-generated charge carriers. Herein, we synthesized a K, P co-doped g-C 3 N 4 (KPCN) with cyano defects via microwave-assisted heating of the mixture of KH 2 PO 4 and melamine in just 7 min. The KPCN exhibits a reduced bandgap of 2.37 eV and introduces a mid-gap of 1.77 eV, which broadens light absorption to the visible-near-infrared (vis-NIR) spectrum with light absorption to 867 nm. Impressively, the co-doped K and P adjust the interlayer and in-plane electron distribution of g-C 3 N 4 , enhancing charge separation and transfer. The KPCN exhibits a remarkable improvement in H 2 O 2 yield of 7.74 mM g−1 h−1, demonstrating superior catalytic activity compared to microwave pure g-C 3 N 4 (MCN, 5.1 times) and bulk g-C 3 N 4 (BCN, 19.2 times). The results indicate that the K, P co-doped g-C 3 N 4 synthesized rapidly and efficiently by microwave method has relatively stable and considerable photocatalytic activity, which has great potential application in the industrial production of H 2 O 2. • K, P co-doped g-C 3 N 4 (KPCN) was prepared by rapid microwave synthesis in just 7 min. • K, P co-doping optimizes the in-plane electron distribution and interlayer electron migration of g-C 3 N 4. • KPCN exhibits a reduced bandgap from 2.75 eV to 2.37 eV and introduces a mid-gap at 1.77 eV. [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]

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]