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Three different nanorod-like gallium oxides with mono/poly-crystalline nature(α, β, and α/β-Ga2O3) were prepared by regulating the amount of polyethylene glycol(PEG) 6000 in the range of 0.2–0.8 g proportionally via a hydrothermal method combined with further calcination. The bandgap of the products, given by UV-Vis diffuse reflectance spectra(UV-Vis DRS), was in the order of α-Ga2O3 > α/β-Ga2O3 > β-Ga2O3. To further investigate the photocatalysis performance of the catalysts, the decomposition of rhodamine B(Rh B) by Ga2O3 under UV light illumination(λ < 387 nm) was presented and complete degradation could be achieved within 30 min, a result that showed the highest efficiency. The photocatalytic oxidation mechanism is further discussed and prominently related to the active species: hydroxyl radical(·OH) and superoxide radical(O·-2), which were confirmed by electron paramagnetic resonance(EPR).
Three different nanorod-like gallium oxides with mono / poly-crystalline nature (α, β, and α / β-Ga2O3) were prepared by regulating the amount of polyethylene glycol (PEG) 6000 in the range of 0.2-0.8 g proportionally via a The bandgap of the products, given by UV-Vis diffuse reflectance spectra (UV-Vis DRS), was in the order of α-Ga2O3> α / β-Ga2O3> β-Ga2O3. To further investigate the photocatalyysis performance of the catalysts, the decomposition of rhodamine B (Rh B) by Ga2O3 under UV light illumination (λ <387 nm) was presented and complete degradation could be achieved within 30 min, a result that showed the highest efficiency. The photocatalytic oxidation mechanism is further discussed and prominently related to the active species: hydroxyl radical (· OH) and superoxide radical (O · -2), which were confirmed by electron paramagnetic resonance (EPR).