Catalytic degradation of "trinitrogen" by Fe-Ce-SiO2 aerogel@TiO2

Abstract

Abstract The "Three nitrogens" [Ammonia nitrogen (NH4 + -N), Nitrate nitrogen (NO3 − -N) and Nitrite nitrogen (NO2 − -N)] from industrial or domestic wastewater can lead to eutrophication of water bodies, ammonia The conversion of nitrogen into nitrate nitrogen will cause high nitrogen and oxygen demand (NOD), which will also lead to methemoglobinemia, and the high content of nitrite in the water body will increase the risk of cancer. In this paper, SiO2 aerogel is used as a carrier to synthesize Fe-Ce bimetal-doped composite materials (Fe-Ce/SiO2 and Fe-Ce-SiO2/TiO2) for the adsorption and degradation of "three nitrogens". The effect of metal Fenton reagent (Fe-Ce/SiO2) Fenton catalysis and photo-Fenton cooperative catalysis (Fe-Ce-SiO2/TiO2) on the degradation efficiency of "three nitrogens". SiO2/TiO2 was prepared by dipping method, and Fe and Ce bimetals were loaded on the surface of SiO2/TiO2 material, and the effect of photo-Fenton oxidation on the degradation rate of "three nitrogen" under different materials was explored. The results showed that: when the dosage of catalyst was 0.01 g, pH value was 11.0, and the concentration of H2O2 was 80 mmol/L, the photocatalytic efficiency was the best, and the degradation efficiency of "three nitrogen" remained above 70%.