New type of Z-scheme LaFeO ₃ /g-C ₃ N ₄ heterostructures were successfully prepared and the enhanced photocatalytic hydrogen evolution and degradation activities are presented.

A facile approach to synthesize Zn_xCu_yInS1.5+x_{+ 0.5}y nanocrystal emitters was presented. The compositions of these nanocrystals were precisely controlled, and the relative PL quantum yields were up to 40%, with tunable emissions in 450–640 nm.

Cu₂V₂O₇/Cu₃V₂O₈/g-C₃N₄ heterojunctions (CVCs) were prepared successfully by the reheating synthesis method. The thermal etching process increased the specific surface area. The formation of heterojunctions enhanced the visible light absorption and improved the separation efficiency of photoinduced charge carriers. Therefore, CVCs exhibited superior adsorption capacity and photocatalytic performance in comparison with pristine g-C₃N₄ (CN). CVC-2 (containing 2 wt% of Cu₂V₂O₇/Cu₃V₂O₈) possessed the best synergistic removal efficiency for removal of dyes and antibiotics, in which 96.2% of methylene blue (MB), 97.3% of rhodamine B (RhB), 83.0% of ciprofloxacin (CIP), 86.0% of tetracycline (TC) and 80.5% of oxytetracycline (OTC) were eliminated by the adsorption and photocatalysis synergistic effect under visible light irradiation. The pseudo first order rate constants of MB and RhB photocatalytic degradation on CVC-2 were 3 times and 10 times that of pristine CN. For photocatalytic degradation of CIP, TC and OTC, it was 3.6, 1.8 and 6.1 times that of CN. DRS, XPS VB and ESR results suggested that CVCs had the characteristics of a Z-scheme photocatalytic system. This study provides a reliable reference for the treatment of real wastewater by the adsorption and photocatalysis synergistic process.

NiS cocatalyst modified LaFeO ₃ /g-C ₃ N ₄ heterostructures were prepared and their enhanced photocatalytic hydrogen evolution performance under visible light irradiation was presented.

Mesoporous LaFeO₃/g-C₃N₄ Z-scheme heterojunctions (LFC) were synthesized via the incorporation of LaFeO₃ nanoparticles and porous g-C₃N₄ ultrathin nanosheets. The as prepared LFC were characterized by transmission electron microscopy, scanning electron microscopy, atomic force microscopy, X-ray photoelectron spectroscopy, powder X-ray diffraction, Raman spectra and N₂ adsorption analysis. The structural analysis indicated that the reheating process and the addition of NH₄Cl in the thermal polymerization were the key factors to get porous g-C₃N₄ ultrathin nanosheets and to obtain high specific surface areas of LFC. It remarkably enhanced the adsorption capacity and photocatalytic degradation of LFC for removal of oxytetracycline (OTC). The effect of the mass percentage of LaFeO₃ in LFC, pH and temperature on the OTC adsorption was investigated. The LaFeO₃/g-C₃N₄ heterojunction with 2 wt % LaFeO₃ (2-LFC) exhibited highest saturated adsorption capacity (101.67 mg g⁻¹) and largest photocatalytic degradation rate constant (1.35 L g⁻¹ min⁻¹), which was about 9 and 5 times higher than that of bulk g-C₃N₄ (CN), respectively. This work provided a facile method to prepare mesoporous LaFeO₃/g-C₃N₄ heterojunctions with especially well adsorption and photocatalytic activities for OTC, which can facilitate its practical applications in pollution control.