Mesoporous Silica-Coated Selenium Nanoparticles and Their Effects on Selenium-Enriched Properties of <i>Pleurotus Geesteranus</i>

Nano-selenium is ideal for selenium source materials in the fields of selenium-enriched fertilizer. However, existing nano-seleniums often suffer from low chemical stability and dispersity, limiting their widespread use. Here, a novel mesoporous Se NPs@SiO 2 nanoparticle with high dispersity is synthesized by the Stober method. The application of Se NPs@mSiO 2 nanoparticles for selenium-enriched fertilizer in Pleurotus geesteranus planting is reported. Compared with Na 2 SeO 3 and Se nanoparticles, Se NPs@mSiO 2 selenium source material can enhance the stability and dispersity of Se NPs in NPK ternary compound fertilizer. Mesoporous silica-coated selenium nanoparticles also increased the adsorption of Se on plant leaves, and long-term stability for plant selenium supplements. Moreover, these Se NPs@mSiO 2 selenium source materials enable promote growth and selenium-enriched performance of P. geesteranus by high bioactivity. Implementation of core–shell structure selenium source material significantly reduces nano-selenium dose and hence cytotoxicity, providing a paradigm for promoting growth and selenium-enriched performance of plants.