Based on the above results, Ni@C/TiO2-5 nm and Ni@C/TiO2-Z were taken to catalyze benzyl alcohol oxidization at different wavelengths and in different reaction time. The results are shown in Figure . As the wavelength decreasing, the conversion of benzyl alcohol gradually increases, but when the wavelength is reduced to 365 nm, the selectivity of benzaldehyde is significantly reduced. The greater the energy from the radiation of the shorter wavelength leads to further oxidation of benzaldehyde to benzoic acid. Considering that benzaldehyde oxidized to benzoic acid at 365 nm wavelength, the subsequent choice of 380 nm wavelength is to investigate the effect of reaction time on product yield and selectivity. The conversion of benzyl alcohol increased with the increase of the reaction time. When the Ni@C/TiO2-Z was used, the conversion rate of benzyl alcohol was 49.48% after 6 h, and the conversion rate of benzyl alcohol increased to 92.88% after 24 h of reaction (Figure and). In general, the activity of Ni@C/TiO2-Z is better than that of Ni@C/TiO2-5 nm under the same reaction conditions. To obtain a high conversion of benzyl alcohol while preventing excessive oxidation of benzaldehyde, Ni@C/TiO2-Z is selected as the catalyst, and a reaction at a wavelength of 380 nm for 18 h is a suitable condition. Different solvents were then tested in photocatalytic oxidation of benzyl alcohol.