A new rare earth borate photocatalytic material ErBO 3 has been successfully prepared by hydrothermal method. Due to the particularities of f – f electron transition of Er 3+ ion, ErBO 3 becomes a visible light responsive photocatalytic material. ErBO 3 exhibits certain photodegradation ability to RhB molecules. Then, a series of GO@ErBO 3 composites were prepared by using GO as a co-catalyst. The properties of samples were characterized using XRD, FE-SEM, XPS, FT-IR, Raman, and BET methods. Through detection analysis, it was found that the combination of GO could improve the visible light absorption performance, the specific surface area and the photogenerated carrier separation efficiency of ErBO 3 material, and then the visible light responsive photocatalytic material 0.5 wt%GO@ErBO 3 with excellent performance was obtained. The prepared composite exhibited high degradation performance towards pollutants which affirmed potential the applicability of the proposed degradation system for degrading real industrial effluents.
Take advantage of the 4 f electron transition of Er ions and two-dimensional nanosheets, four kinds of ErBO 3 powders with different morphologies were prepared by hydrothermal method and their photocatalytic degradation performance of Norfloxacin were investigated. XRD and SEM results indicate that all four prepared products are single-phase ErBO 3 compounds, exhibiting distinct microstructural morphologies. Among them, the ErBO 3 (8) flower self-assembled by two-dimensional nanosheets exhibits the highest photocatalytic performance and the degradation rate of norfloxacin can reach 89.6 % after 120 min illumination, and the first-order rate constant is 1.04 × 10 −2 min −1 . Through the comparative analysis of the four powders’ properties, it was found that ErBO 3 (8) flower balls had the lowest fluorescence intensity and the highest photocurrent, which indicated that the material exhibits a high efficiency in separating photogenerated carriers. This can primarily be attributed to its unique nanosheet structure, which not only confers a high specific surface area but also significantly increases the concentration of chemisorbed oxygen, thereby effectively suppressing the recombination of photogenerated carriers.
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