Recently, graphitic carbon nitride (g-C₃N₄) as a metal-free conjugated polymer has emerged as a photocatalyst showing catalytic activity for water splitting, CO₂photoreduction and degradation of organic pollutants under visible light irradiation.

G-C₃N₄ with structural defects and low polymerization synthesized by urea as the precursor for photocatalytic H₂ production under visible light.

Perovskite-type oxides lanthanum ferrite (LaFeO₃) photocatalysts were successfully prepared by a facile and cost-effective sol-gel method using La(NO)₃ and Fe(NO)₃ as metal ion precursors and citric acid as a complexing agent at different calcination temperatures. The properties of the resulting LaFeO₃ samples were characterized by powder X-ray diffraction (XRD), energy dispersive X-ray spectroscopy (EDXS), UV-Vis diffuse reflectance spectroscopy (DRS), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectra (IR), transmission electron microscopy (TEM), N₂ adsorption/desorption and photoelectrochemical tests. The photoactivity of the LaFeO₃ samples was tested by monitoring the photocatalytic degradation of Rhodamine B (RhB) and 4-chlorophenol (4-CP) under visible light irradiation, the highest photocatalytic activity was found for LaFeO₃ calcined at 700 °C, which attributed to the relatively highest surface area (10.6 m²/g). In addition, it was found from trapping experiments that the reactive species for degradation were superoxide radical ions (O₂⁻) and holes (h⁺). Photocurrent measurements and electrochemical impedance spectroscopy (EIS) proved the higher photo-induced charge carrier transfer and separation efficiency of the LaFeO₃ sample calcined at 700 °C compared to that that calcined at 900 °C. Band positions of LaFeO₃ were estimated using the Mott-Schottky plots, which showed that H₂ evolution was not likely.

This paper reports the synthesis of bare TiO₂and various molar concentrations of ruthenium (Ru)-doped TiO₂nanoparticles by the precipitation method.

A solid state method for the large scale synthesis of LaFeO ₃ /g-C ₃ N ₄ nanocomposite with enhanced visible-light photocatalytic degradation activity.