Highly Efficient Silver Modified Srtio3 Photocatalyst: Synergistic Effect of Ag Doping and Ag Decoration

Marcela Frias Ordonez, Carolina Peverelli, E. Falletta, C. Bianchi
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Abstract

Extended Abstract Nitrogen oxides (NO and NO2) are primary pollutants directly linked to respiratory diseases and environmental disasters such as acid rain and photochemical smog [1]. As a result, multiple techniques are used for their abatement. Among them, photocatalysis offers a cost-effective, green, and sustainable technology for air purification. This technology works at ambient condition, exploits the natural or artificial light, and uses semiconductors as photocatalysts to carry out the decomposition of inorganic pollutants on the surface of the material [2]. Over the last few years, perovskite-based materials have been considered as promising candidates for water splitting and water treatment applications [3]. However, their photocatalytic performance for indoor air pollution is scarcely examined. Strontium titanate (SrTiO3) is a cubic-like perovskite with a wide energy band gap (3.2 eV) similar to TiO2. Its chemical, thermal stability, and corrosion resistance make it more attractive for developing advanced thermally stable materials. Nevertheless, its light absorption is limited to the UV spectrum range [4]. For this reason, as for TiO2, proper modifications are required, including metal-doping or metaldecoration. In the former, new energy levels are created leading to energy band gap narrowing, whereas the later improves the charge carrier separation through the semiconductor interface. Both strategies impact significantly the final photocatalytic properties of the material [5]. The work aims at the rational designing of Ag-modified SrTiO3 composite for extending its photocatalytic efficiency towards the degradation of NOx under LED light by using some strategies such as doping and decoration. A preliminary study demonstrated that the 5 wt.% Ag-decorated SrTiO3 achieved nearly 77% NOx removal after 3h. Whilst, through an eco-friendly, simpler, and valuable one-pot synthesis SrTiO3 was doubly modified by Ag+-doping within the SrTiO3 lattice and by Ag nanoparticles-decoration on the SrTiO3 surface. These modifications were confirmed by the XRD technique, where a slight shift towards the higher angles and the presence of additional peaks corresponding to metallic silver could be observed. The synergistic effect between Ag doping and Ag decoration contributed to the complete photodegradation of NOx under LED light after 180 min, reaching a photocatalytic efficiency almost 4 times greater than bare SrTiO3 (26%). The stability of the best material was assessed by performing recycling tests.
高效银修饰Srtio3光催化剂:银掺杂与银修饰的协同效应
氮氧化物(NO和NO2)是与酸雨、光化学雾霾等呼吸系统疾病和环境灾害直接相关的主要污染物[1]。因此,使用多种技术来减少它们。其中,光催化为空气净化提供了一种经济、绿色、可持续的技术。该技术工作在环境条件下,利用自然光或人造光,利用半导体作为光催化剂,对材料表面的无机污染物进行分解[2]。在过去的几年里,钙钛矿基材料被认为是水分解和水处理应用的有希望的候选者[3]。然而,它们对室内空气污染的光催化性能却鲜有研究。钛酸锶(SrTiO3)是一种类似TiO2的具有宽能带隙(3.2 eV)的立方状钙钛矿。它的化学、热稳定性和耐腐蚀性使其对开发先进的热稳定材料更具吸引力。然而,它的光吸收仅限于紫外光谱范围[4]。因此,对于TiO2,需要进行适当的修饰,包括金属掺杂或金属修饰。前者创造了新的能级,导致能带隙缩小,而后者通过半导体界面改善了载流子的分离。这两种策略都会显著影响材料的最终光催化性能[5]。本工作旨在通过掺杂和修饰等策略,合理设计ag修饰的SrTiO3复合材料,以提高其在LED光下降解NOx的光催化效率。初步研究表明,5 wt.% ag修饰的SrTiO3在3h后达到近77%的NOx去除率。同时,通过一种更环保、更简单、更有价值的一锅合成方法,通过在SrTiO3晶格内掺杂Ag+和在SrTiO3表面修饰Ag纳米粒子对SrTiO3进行了双重修饰。这些修饰通过XRD技术得到了证实,可以观察到向更高角度的轻微移动以及与金属银对应的附加峰的存在。Ag掺杂和Ag修饰之间的协同作用使得在LED光下180 min后,NOx完全光降解,光催化效率几乎是裸SrTiO3的4倍(26%)。通过循环试验对最佳材料的稳定性进行了评价。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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