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Surface plasmon resonance triggered promising visible light photocatalysis of LiNbO3 ceramic supported Ag nanoparticles
Journal of the American Ceramic Society ( IF 3.5 ) Pub Date : 2020-10-24 , DOI: 10.1111/jace.17538
Gurpreet Singh 1 , Manish Kumar 1 , Manmohan Singh 1 , Rahul Vaish 1
Affiliation  

LiNbO3 ceramic was fabricated using solid‐state reaction route. Silver nanoparticles (NPs) were loaded on LiNbO3 at room temperature using silver nitrate and polyethylene glycol reagents, without the use of external heat and light energy. The X‐ray diffraction showed only LiNbO3 phase in Ag‐loaded LiNbO3 sample with no peak related to Ag metal due to small fraction of Ag loading. X‐ray energy diffraction spectroscopy elemental color mapping confirmed the uniform loading of Ag metal on LiNbO3 particles. Ag metal was loaded in the form of NPs as visualized under transmission electron microscope. Ag NPs‐loaded LiNbO3 showed enhanced absorption of visible light owing to the phenomenon of surface plasmon resonance (SPR). The loading of Ag NPs had no effect on the band gap energy of LiNbO3 ceramic. X‐ray photoelectron spectroscopy technique confirmed the metallic chemical state of Ag in Ag NPs‐loaded LiNbO3. Ag NPs‐loaded LiNbO3 degraded urn:x-wiley:00027820:media:jace17538:jace17538-math-000197% rhodamine‐B model dye from the solution when irradiated for 240 minutes under visible light. The dye degradation follows pseudo‐first‐order kinetic having k‐value (kinetic rate constant) of as 0.013 min−1. The OH (hydroxyl) and urn:x-wiley:00027820:media:jace17538:jace17538-math-0002 (superoxide) radicals were the main active species behind the photocatalytic activity of Ag NPs‐loaded LiNbO3. Thus, Ag NPs‐loaded LiNbO3 could be a potential material for degrading organic dyes from water.

中文翻译:

表面等离子体共振引发有希望的可见光光催化LiNbO3陶瓷负载的银纳米颗粒

LiNbO 3陶瓷采用固态反应路线制造。在不使用外部热量和光能的情况下,使用硝酸银和聚乙二醇试剂将银纳米颗粒(NPs)在室温下加载到LiNbO 3上。X射线衍射显示,在载有Ag的LiNbO 3样品中,只有LiNbO 3相,由于载有少量Ag,因此没有与Ag金属有关的峰。X射线能量衍射光谱仪的元素色图确认了Ag金属在LiNbO 3颗粒上的均匀负载。如在透射电子显微镜下观察到的那样,Ag金属以NP的形式负载。Ag NPs负载的LiNbO 3由于表面等离振子共振(SPR)现象,可见光对可见光的吸收增强。Ag NPs的负载对LiNbO 3陶瓷的带隙能量没有影响。X射线光电子能谱技术证实了Ag NPs负载的LiNbO 3中Ag的金属化学态。当在可见光下照射240分钟时,载有Ag NPs的LiNbO 3会缸:x-wiley:00027820:media:jace17538:jace17538-math-0001从溶液中降解97%的若丹明B模型染料。染料降解遵循拟一级动力学,其k值(动力学速率常数)为0.013 min -1。该 OH(羟基)和缸:x-wiley:00027820:media:jace17538:jace17538-math-0002(超氧化物)自由基是负载Ag NPs的LiNbO 3的光催化活性的主要活性物质。因此,负载有Ag NPs的LiNbO 3可能是从水中降解有机染料的潜在材料。
更新日期:2020-12-30
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