Core-shell nanocomposites are promising materials in the degradation of harmful chemicals released from industries/factories. In this work, ZnO@SiO₂@Ag triple–layered core-shell nanocomposites synthesized by a facile chemical precipitation route at 400 °C using as-prepared ZnO@SiO₂ samples as a precursor were investigated for photocatalytic application. The synthesized ZnO@SiO₂ and ZnO@SiO₂@Ag samples were characterized using XRD, SEM, TEM, XPS, and UV-Vis spectrometer. The XRD studies showed that both nanocomposites possess the hexagonal wurtzite crystalline phase of the core ZnO. Moreover, the average crystallite sizes of ZnO@SiO₂@Ag composites determined from the XRD spectra were found to be 27.98 nm and 30.56 nm for reaction times of 4 h and 12 h, respectively. The SEM and TEM analyses indicate that the morphologies of the samples were rod-shaped. The UV-Vis spectroscopy showed that the ZnO@SiO₂@Ag nanoparticles exhibited maximum absorbance peak at 363 nm with a calculated band gap energy of 3.13 eV. In addition, the photocatalytic activity and stability were analyzed by a photoreduction method using the photodegradation property of organic methylene blue under UV-Vis light irradiation. Compared with the “bare” ZnO@SiO₂ samples, the stability and photocatalytic performance of the Ag coated ZnO@SiO₂@Ag nanocomposites were highly enhanced, and the reasons for the enhancement are discussed.

核壳型纳米复合材料是降解工业/工厂释放的有害化学物质的有前途的材料。在这项工作中，以制备的ZnO @ SiO ₂样品为前体，通过在400°C的简便化学沉淀途径合成的ZnO @ SiO ₂ @Ag三层核-壳纳米复合材料进行了光催化应用研究。利用XRD，SEM，TEM，XPS和UV-Vis光谱仪对合成的ZnO @ SiO ₂和ZnO @ SiO ₂ @Ag样品进行表征。XRD研究表明，两种纳米复合材料均具有ZnO核的六方纤锌矿晶体相。此外，由X射线衍射图谱确定的ZnO @ SiO ₂ @Ag复合材料的平均晶粒尺寸为27。98 nm和30.56 nm的反应时间分别为4 h和12 h。SEM和TEM分析表明样品的形态为棒状。UV-Vis光谱表明，ZnO @ SiO ₂ @Ag纳米颗粒在363 nm处显示最大吸收峰，计算出的带隙能为3 。13 eV。此外，利用有机亚甲基蓝在UV-Vis光照射下的光降解特性，通过光还原法分析光催化活性和稳定性。与裸露的ZnO @ SiO ₂样品相比，Ag包覆的ZnO @ SiO ₂ @Ag纳米复合材料的稳定性和光催化性能得到了极大的提高，并讨论了增强原因。