Based on the application status of commercial denitration catalysts, the concept of “production, education, research and application” was integrated into the air pollution control engineering experiment, and a Nb₂O₅-S/CeO₂ denitration catalyst with self-protection mechanism was designed and synthesized. The catalyst was characterized by XRD, TEM, H₂-TPR, XPS, NH₃-TPD technology, and the reaction mechanism was explored by in situ DRIFTs. The experimental results showed that Nb₂O₅-S/CeO₂ catalyst exhibited excellent catalytic activity in a wide temperature window. In addition, when K was deposited on Nb₂O₅-S/CeO₂ catalyst, SO₄^2– would preferentially combine with K, thus effectively preventing poison from attacking Ce-Nb active site.

As an emerging pollutant, microplastics are released into the environment and undergo aging behavior. Aged microplastics interacted with pollutants such as heavy metals and resulted in complex pollution, posing potential threats to the environment and humans. Therefore, understanding the interaction between aged microplastics and heavy metal ions is crucial for evaluating the combined toxicity of microplastics and heavy metals and their impacts on the environment. In this paper, Cu(Ⅱ), Pb(Ⅱ) and Cr(Ⅲ) are used as typical heavy metal ions to study the adsorption kinetics of naturally aged microplastics on typical heavy metal ions and analyze the effect of particle size and salinity on the adsorption behavior. It is characterized by FTIR, XPS, SEM, BET and XRD. Finally, the adsorption mechanism of microplastics on heavy metal ions before and after the aging of microplastics is discussed. This experiment takes microplastics, an emerging environmental pollutant, as the research object, and organically combined basic teaching content with scientific research hotspots, which is comprehensive, applicable and exploratory. It is beneficial to cultivate students' innovation comprehensive practical ability and scientific research literacy.