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In this paper, the microstructure evolution of polymeric carbon nitride was investigated and Au ions was used to improve its photocatalytic efficiency. Their structures were investigated by FT-IR, XPS, XRD, SEM and TEM. Their specific surface area and aperture distribution were measured by BET. Meanwhile, the energy band structure and electron-hole separation efficiency were analyzed by UV–Vis and PL spectroscopy. In addition, the photocatalytic performance of the photocatalysts was assessed by photocatalytic degradation of RhB and photocatalytic hydrogen evolution. The results showed that 600-PCN possessed the best photocatalytic performance, with a degradation rate of 46.92 % in 150 min. What's more, the degradation rate of RhB solution by 2 % Au/PCN reached 47.88 %, which was 2.17 times higher than that of 550-PCN (22.01 %). During the degradation process, h+ oxidatively degrade RhB. The hydrogen production rate of 2 % Au/PCN was about 11.658 μmol/g/h, which was 41.23 times higher than that of 550-PCN (0.282 μmol/g/h). • PCN is basically formed at 500 oC, but 600-PCN has better photocatalytic performance. • 2.0 % Au/PCN showed the best hydrogen production performance, with a hydrogen production rate of about 11.658 μmol/g/h. • 2.0 % Au/PCN showed the highest degradation rate of RhB solution with 47.88 %, and the main active substance is h+. [ABSTRACT FROM AUTHOR]

Heterojunction engineering is considered an effective strategy to improve the photocatalytic hydrogen production efficiency. In this paper, the novel CdIn 2 S 4 @NH 2 -MIL-125 (CIS@TIM) heterojunction photocatalysts were synthesized by the facile hydrothermal method. And the photocatalytic performance and stability for CIS@TIM of CIS were systematically investigated. Among these catalysts, the optimal catalysts (CIS@ with different ratios TIM-30) exhibited the highest photocatalytic hydrogen rate (2550 μmol g−1 h−1) under visible light illumination, which was more than 3 times that of pure CIS. The enhancement of photocatalytic hydrogen production activity was mainly due to the construction of heterojunction between CdIn 2 S 4 and NH 2 -MIL-125. The construction of heterojunction can effectively separate photogenerated electrons and holes. Significantly, a rational catalytic mechanism that Z-scheme heterojunction was constructed between CdIn 2 S 4 and NH 2 -MIL-125 was put forward, which can remarkably boost the photo-redox ability of the CIS@TIM composite. This work provides a new horizon for exploring high-efficient Z-scheme photocatalysts for photocatalytic H 2 evolution by the heterojunction engineering. [Display omitted] • Novel CdIn 2 S 4 @NH 2 -MIL-125 heterojunction photocatalysts was successfully prepared. • CdIn 2 S 4 @NH 2 -MIL-125 showed excellent photocatalytic hydrogen generation performance. • CdIn 2 S 4 @NH 2 -MIL-12530 exhibited effective separation of electron and hole pairs. [ABSTRACT FROM AUTHOR]

In this paper, a visible light-driven polymeric carbon nitride (PCN)/(Pt)/nano-spherical MoS 2 photocatalysts was prepared using a self-assembly method. The structure of photocatalysts was explored by FT-IR, XPS, XRD, BET, SEM and TEM. Meanwhile, the energy band structure and electron hole separation efficiency were also analyzed by UV–Vis and PL spectra. In addition, the photocatalytic performance of photocatalysts were tested by photocatalytic degradation of Rhodamine B and photocatalytic hydrogen evolution. The results showed that PCN/2.0%MoS 2 showed the best photocatalytic performance, and the degradation rate of Rhodamine B could reach 98.39% within 150 min. Besides, the introduction of Pt nanoparticles significantly improved the photocatalytic activity. The degradation rate of Rhodamine B reached 100% within 150 min, and the rate of photocatalytic hydrogen production of PCN/Pt/MoS 2 system was increased by 21.3% over the PCN/2.0%MoS 2 system. The separation mechanism of electron and hole is Z-scheme mechanism and the main active substances for photocatalytic degradation were · O 2 − and h+. [Display omitted] • The catalyst is prepared by self-assembly. • Pt promotes the formation of carriers. • The transportation of carriers is Z-scheme. [ABSTRACT FROM AUTHOR]