Abstract The development of magnetically recyclable photocatalysts for economic and green H2O2 synthesis from water and oxygen only is virtually unexplored. Magnetic recyclability makes possible cost-effective laboratory or industrial reuse of the catalyst. The present research shows that magnetically recyclable starch functionalized Fe3O4/Ag/Ag2O superparamagnetic nanocomposites are very good visible light photocatalysts for H2O2 formation. These nanocomposites were prepared by precipitating Ag/Ag2O fine-sized nanostructures on starch functionalized magnetite nanoparticles (SMNPs). HR-TEM, XRD, and XPS analysis results showed the formation of SMNPs dotted with fine-sized Ag/Ag2O nanostructures smaller than their quantum confinement regimes. A p-n heterojunction is formed between (n-type) starch functionalized magnetite and (p-type) Ag2O components. Enhanced charge separation and the presence of plasmonic Ag nanostructures on the SM component cause efficient oxygen reduction with high H2O2 formation rates.

中文翻译：

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用于生产过氧化氢的磁性可回收可见光光催化剂的开发

摘要 用于仅由水和氧气合成经济且绿色的 H2O2 的磁性可回收光催化剂的开发实际上尚未开发。磁性可回收性使催化剂的成本效益实验室或工业再利用成为可能。目前的研究表明，磁性可回收淀粉功能化的 Fe3O4/Ag/Ag2O 超顺磁性纳米复合材料是非常好的可见光光催化剂，用于形成 H2O2。这些纳米复合材料是通过在淀粉功能化的磁铁矿纳米粒子 (SMNP) 上沉淀 Ag/Ag2O 精细纳米结构来制备的。HR-TEM、XRD 和 XPS 分析结果表明，SMNP 的形成散布着比其量子限制范围小的细尺寸 Ag/Ag2O 纳米结构。在（n 型）淀粉官能化磁铁矿和（p 型）Ag2O 组分之间形成 pn 异质结。增强的电荷分离和 SM 组件上等离子体 Ag 纳米结构的存在导致有效的氧还原和高 H2O2 形成率。