Synthesis of mesoporous β-Ga2O3 nanorods using PEG as template: Preparation, characterization and photocatalytic properties

► Molecular weight and the dosage of PEG are vital factor for synthesis. ► PEG-assisted hydrothermal mechanism of mesoporous β-Ga2O3 is proposed. ► Seven kinds of intermediates were identified the photocatalytic oxidation online. ► β-Ga2O3 is an environmental friendly photocatalyst.