The Development and Applications of Novel, Hybrid Niobium Pentoxide Nanocomposites in Photocatalysis

新型杂化五氧化二铌纳米复合材料在光催化中的开发和应用

• 批准号: RGPIN-2015-06009
• 负责人: HallettTapley, Geniece
• 金额: $ 1.46万
• 依托单位: St. Francis Xavier University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2019
• 资助国家: 加拿大
• 起止时间: 2019-01-01 至 2020-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=677317
• 关键词: Development; Applications; Novel; Hybrid; Niobium

Due to the high abundance of niobium (Nb) and >99% of the total worldwide Nb production found jointly between Canada and Brazil, finding new applications for niobium-based materials benefits both economies by creating new collaborative markets and technologies. Namely, heterogeneous catalysis is of particular interest as the remarkable chemical versatility of Nb2O5 allows for use not only as well-known Bronsted and Lewis acid catalysts, but also presents an opportunity for development of its understudied photocatalytic and supramolecular properties.******Noble metal nanoparticles, in particular gold (AuNP), have garnished attention as catalysts in a number of organic reactions. Recent work has focused on the photochemical generation of AuNP, resulting in nanomaterials with exceptional stability and small size distribution, ideal for catalytic testing. In lieu of typical, bench-top catalysis, exploitation of the surface resonance properties of AuNP presents the opportunity to study the catalysis of various organic reactions, using "greener" photochemical methodologies and introducing visible light as an integral reaction participant. AuNP possess an easily identifiable absorption in the visible region of the electromagnetic spectrum, termed the surface plasmon band (SPB). SPB AuNP excitation has been shown to induce catalytic reactions by way of localized heating of the nanoparticle surface, as well as electron transfer pathways.*** ***The proposed research aims to draw on the suggested photocatalytic abilities of niobium oxide and niobium oxide salts as potential photocatalytic alternatives to TiO2-derived catalysts. Though still able to be excited within the UV region of the spectrum, modifying niobate semiconductor supports with AuNP is attractive for potentially improved photo-induced reduction performance. AuNP incorporation into the niobate structure will extend the absorption of light into the visible region of the electromagnetic spectrum to include that of solar energy (a highly desired property for energy conservation measures), and may also be used to improve the photocatalytic properties of the nanomaterial itself by maximizing photoinduced charge separation. Moreover, the intrinsic photocatalytic characteristics of AuNP supported on layered niobate guest-host systems may also be of considerable interest in regards to the development of novel sensitized materials for energy storage.  These unique supramolecular structures may be useful for examining the effects of molecular confinement on catalytic reactions and also be beneficial towards investigating the electron transport capabilities of supramolecular niobate-derived supports, favorable in energy storage/conversion and renewable energy research.  Most importantly, this research will examine the light-induced chemical properties of an abundant, and uniquely Canadian, global resource.**************

由于Nb(Nb)的高丰度和占全球Nb总产量的99%，加拿大和巴西联合发现了基于Nb的材料的新应用，通过创造新的合作市场和技术使两国经济受益。也就是说，由于Nb2O5具有显著的化学多样性，不仅可以用作著名的Bronsted和Lewis酸催化剂，而且还提供了开发其未被充分研究的光催化和超分子性质的机会。贵金属纳米颗粒，特别是金(AuNP)在许多有机反应中作为催化剂引起了人们的关注。最近的工作集中在AuNP的光化学产生上，导致纳米材料具有非凡的稳定性和小尺寸分布，非常适合于催化测试。利用AuNP的表面共振特性，取代了典型的台式催化，提供了研究各种有机反应催化的机会，使用“更绿色”的光化学方法，并引入可见光作为完整的反应参与者。AUNP在电磁光谱的可见光区具有易于识别的吸收，称为表面等离子激元带(SPB)。SPB的AuNP激发通过纳米颗粒表面的局部加热以及电子转移途径来诱导催化反应。本研究旨在利用NbO_2和Nb_2O_3盐作为潜在的光催化替代物来替代TiO_2衍生催化剂。虽然仍然能够在光谱的紫外区被激发，但用AuNP修饰Nb酸盐半导体载体具有潜在的改善光诱导还原性能的吸引力。将AUNP掺入到Nb酸盐结构中，将把光吸收扩展到电磁光谱的可见光区域，包括太阳能(这是节能措施非常希望的特性)，还可以通过最大化光致电荷分离来改善纳米材料本身的光催化性能。此外，层状Nb酸盐客体-宿主体系负载的AuNP固有的光催化特性也可能对开发新型的敏化储能材料具有相当大的兴趣。这些独特的超分子结构可能有助于考察分子限制对催化反应的影响，也有助于研究超分子Nb酸盐衍生载体的电子传输能力，有利于能量存储/转换和可再生能源的研究。最重要的是，这项研究将考察加拿大丰富而独特的全球资源的光诱导化学性质。