Abstract Titanomagnetite is widely distributed in nature, and has potentials in environmental remediation. Nanometric titanomagnetite particles were usually prepared via soft chemistry routes in aqueous solutions. Herein a novel soft chemistry route carried out in a deep eutectic solvent (DES) comprising choline chloride and urea in a molar ratio of 1:2 was successfully developed to make titanomagnetite nanoparticles (Fe2.5Ti0.5O4-DES, ~30 nm). The chemical composition analyzed by different methods revealed that Fe2.5Ti0.5O4-DES nanoparticles possess the Ti-rich core and Fe-rich shell. The Fe2.5Ti0.5O4-DES nanoparticles exhibited enhanced activities in catalytic decomposition of H2O2 and oxidative degradation of organic contaminants at circumneutral pH values and room temperature, which was mainly attributed to the increased content of ferrous (Fe2+) ions upon substitution of Ti4+ for ferric (Fe3+) ions in spinel structure of magnetite.

中文翻译：

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具有增强的类过氧化物酶活性的钛磁铁矿磁性纳米粒子的新软化学途径

摘要 钛磁铁矿在自然界中分布广泛，具有修复环境的潜力。纳米钛磁铁矿颗粒通常通过软化学路线在水溶液中制备。在此，成功开发了一种在包含摩尔比为 1:2 的氯化胆碱和尿素的深共熔溶剂 (DES) 中进行的新型软化学路线，以制备钛磁铁矿纳米粒子 (Fe2.5Ti0.5O4-DES，~30 nm)。通过不同方法分析的化学成分表明，Fe2.5Ti0.5O4-DES 纳米粒子具有富钛核和富铁壳。Fe2.5Ti0.5O4-DES 纳米粒子在中性 pH 值和室温下表现出增强的 H2O2 催化分解和有机污染物氧化降解活性，