In this study, the magnetic core-shell nanomaterial Fe₃O₄/SiO₂/N-TiO₂/Ag/AgCl (FSNT/Ag/AgCl) that efficiently degraded methyl orange (MO) was produced. The dosages of tetrabutyl titanate (TBOT), urea and AgNO₃ were optimized by response surface methodology (RSM). Scanning electron microscope (SEM), transmission electron microscope (TEM), X-ray photoelectron spectroscopy analysis (XPS), energy dispersive spectrometer (EDS), X-ray diffractometer (XRD), fourier transform infrared spectrometer (FT-IR), and UV–vis diffuse reflectance spectrum (UV–vis DRS) were used to characterize the nanomaterial. The particle size of FSNT/Ag/AgCl was 91.98 nm, and it presented a core-shell structure with Fe₃O₄ as the core, SiO₂ and N-TiO₂ wrapped in Fe₃O₄, and Ag/AgCl deposited on the outermost layer. Performance and mechanism research experiments showed that under the optimized conditions of 1 g/L FSNT/Ag/AgCl, pH = 9, temperature of 35℃ and initial MO concentration of 10 mg/L, about 90 % of MO was degraded in 20 min. The mineralization rate was 35.2 % within 120 min. Holes (h⁺) and superoxide anions (·O₂⁻) were the main active substances in the whole photocatalytic degradation. FSNT/Ag/AgCl could be recovered by magnet. After 5 repeated experiments, the degradation rate of MO within 100 min still reached 88.5 %. This work provides a recyclable core-shell nanomaterial for faster degradation of dye wastewater.

在本研究中，制备了能有效降解甲基橙（MO）的磁性核-壳纳米材料Fe ₃ O ₄ / SiO ₂ / N-TiO ₂ / Ag / AgCl（FSNT / Ag / AgCl）。钛酸四丁酯（TBOT），尿素和AgNO ₃的剂量通过响应表面法（RSM）进行了优化。扫描电子显微镜（SEM），透射电子显微镜（TEM），X射线光电子能谱分析（XPS），能量色散光谱仪（EDS），X射线衍射仪（XRD），傅立叶变换红外光谱仪（FT-IR）和紫外可见漫反射光谱（紫外可见DRS）用于表征纳米材料。FSNT / Ag / AgCl的粒径为91.98 nm，具有Fe ₃核-壳结构以O ₄为核，包裹在Fe ₃ O _4中的SiO ₂和N-TiO ₂，以及沉积在最外层的Ag / AgCl。性能和机理研究表明，在1 g / L FSNT / Ag / AgCl的最佳条件下，pH = 9，温度为35℃，初始MO浓度为10 mg / L，在20 min内降解了约90％的MO。 。120分钟内矿化率为35.2％。空穴（h ⁺）和超氧阴离子（·O2 ₂ ^-）是整个光催化降解过程中的主要活性物质。FSNT / Ag / AgCl可通过磁铁回收。经过5次重复实验，在100min内MO的降解率仍达到88.5％。这项工作提供了一种可回收的核壳纳米材料，用于更快地降解染料废水。