Polyaniline (PANI) decorated Bi₂MoO₆ nanosheets are capable of showing dual functionality, both as efficient optical limiters and recyclable photocatalysts, due to the efficient interfacial charge transfer.

An optimized TiO₂/BiOCl heterojunction with a Ti : Bi molar ratio of 4 : 1 exhibits the best photocatalytic performance. The removal rate of nitrogen oxides of the composite photocatalyst can reach 75%, which outperforms other control samples.

The CoSe@NiSe₂@MoS₂ composite exhibits an effective catalytic performance that is comparable to and/or better than many previously reported systems. The efficient electrocatalytic performance is ascribed to the synergetic effect between each component.

To improve the photocatalytic activity of titanium dioxide, a novel nanocomposite was prepared via axial coordination of zinc porphyrin on the semiconducting titanium dioxide surface modified with axial coordinating ligand functionality, pyridine. The obtained product (zinc porphyrin/titanium dioxide) was characterized by Fourier transform infrared spectroscopy, X-ray diffraction, fluorescence, thermogravimetric analysis, and Raman spectroscopic techniques. The photocatalytic performance of the samples was investigated by photodegradation of rhodamine B in aqueous solution. The attached zinc porphyrin on the surface can act as a small bandgap semiconductor to absorb visible light, resulting in the formation of electron–hole separation and an improved photocatalytic activity for the nanocomposite.