Preparation and characterization of Ag3PO4/GaOOH composite with enhanced photocatalytic performance toward Rhodamine B
Highly efficient Ag3PO4/GaOOH composite was innovatively prepared and its photocatalytic performance was evaluated through degrading Rhodamine B (RhB) under illumination in this paper. Characterizations including XRD, SEM-EDS, TEM, FT-IR, XPS, UV-Vis DRS, PL and EPR were used to analyze the properties of Ag3PO4/GaOOH composite. The SEM-EDS results indicated that there were dispersed Ag3PO4 particles on the surface of GaOOH sticks. The (210) plane of Ag3PO4 particles and the (200) plane of GaOOH sticks were observed at the same time in the TEM results. UV-Vis DRS analysis indicated that Ag3PO4/GaOOH composite showed a significant red shift compared to pure GaOOH. PL spectra also indicated that the construction of Ag3PO4/GaOOH composite significantly declined the recombination rate of photogenerated electrons-holes pairs. The photocatalytic degradation experiments showed that the 30wt% Ag3PO4/GaOOH composite demonstrated excellent performance under illumination. After reaction time of 60 min, the decolorization rate of RhB was up to 97.83% with 30wt% Ag3PO4/GaOOH composite. Further study confirmed that 30wt% Ag3PO4/GaOOH composite had good stability and the contribution of active species during degradation was: h+ > ·O2- > ·OH. The results of this work would provide a new perspective for improving the application of wide band gap semiconductors to light.