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Rapid synthesis of triple-layered cylindrical ZnO@SiO 2 @Ag core-shell nanostructures for photocatalytic applications
Journal of Nanoparticle Research ( IF 2.1 ) Pub Date : 2020-11-23 , DOI: 10.1007/s11051-020-05086-0
Gashaw Beyene , Teshome Senbeta , Belayneh Mesfin , Ni Han , Gamachis Sakata , Qinfang Zhang

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.



中文翻译:

用于光催化应用的三层圆柱形ZnO @ SiO 2 @Ag核壳纳米结构的快速合成

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2798 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。

更新日期:2020-11-25
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