No abstract

The Ta doped ZnO nanorods (Ta-ZnO) were synthesized by a hydrothermal method at different temperatures (110, 150, and 170 °C) for the photodegradation of methylene blue (MB) under visible light.

This work presents a green route to synthesize single phase Ce‐doped ZnO nanoparticles using Hedyotis capitellata leaf extract (HC‐Ce@ZnO) as an effective reactant. The phase composition and crystalline nature of HC‐Ce@ZnO with various weight% Ce‐doping concentrations were examined by X‐ray diffraction (XRD) method. The organic functional groups that played the key role in the transformation of Zn2+ into ZnO were recognized by Fourier‐transform infrared spectroscopy (FT‐IR). The transmission electron microscopy (TEM) image revealed that HC‐Ce@ZnO nanoparticles were mainly spherical with the diameter of 2‐6 nm. The biosynthesized HC‐Ce@ZnO nanoparticles were then applied for the treatment of methyl orange (MO) using UV‐Vis measurement. It's been found that Ce3+ ions were easily incorporated into ZnO crystal lattice to form single crystals of Ce@ZnO. The optimal 1 %Ce‐doped ZnO nanoparticles can remove 92 % MO within 240 min under irradiation of visible light. The study on photocatalytic degradation kinetics showed that the reaction has pseudo first‐order nature with the rate constant k = 0.0133 min‐1.

Ce doped ZnO nano-catalysts were synthesized by two different methods i.e., hydrothermal and polymer gel combustion method, to compare their photodegradation efficiency.

Nanocapsule composites of C/Ce-co-doped ZnO supported on graphene synthesized by a one-pot hydrothermal method with a band gap of 2.72 eV were used to enhance the photodegradation of methylene blue under various conditions.