| Citation: | LU M J,FANG H S,HUANG H J,et al.Effect of 5% Ag on the morphology and toluene oxidation of MnO2 nanorod and sea urchin microspheres[J].Journal of Environmental Engineering Technology，2024，14（4）：1239-1246 doi: 10.12153/j.issn.1674-991X.20230865
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MnO2 nanorod and sea urchin microspheres were prepared using the hydrothermal method, and Mn-Ag composite oxides were prepared by in-situ doping with 5% Ag. The as-prepared samples were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), BET, Raman and other characterization techniques, and the removal performance of different catalysts for toluene was investigated. It was found that the amount of (NH4)2S2O8 would affect MnO2 morphology. MnO2 nanorods were formed when (NH4)2S2O8 was 2.28 g, while MnO2 sea urchin microspheres were formed when (NH4)2S2O8 was 6.84 g. There was no morphology change of MnO2 nanorods after 5% Ag doping. However, the nanowires on the surface of MnO2 sea urchin microspheres increased when 5% Ag was doped, and the entanglement phenomenon occurred, forming a hollow bird's nest structure. After 5% Ag doping, there was no effect on the crystal of MnO2 nanorods and sea urchin microspheres, both of which were α-MnO2, but a diffraction peak of Mn2O3 appeared in 5% Ag-MnO2 nanorods. Compared to MnO2 nanorods, MnO2 sea urchin microspheres showed an increasing trend of specific surface area, pore size and pore volume. The doping of Ag further increased the specific surface area, pore size and pore volume of MnO2 sea urchin microspheres. For the toluene removal, MnO2 sea urchin microspheres showed a better toluene removal performance than MnO2 nanorods, and 5% Ag-MnO2 sea urchin microspheres showed the best toluene removal performance among all the catalysts.
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