Synergistic dual-defect band engineering for highly efficient photocatalytic degradation of microplastics via Nb-induced oxygen vacancies in SnO2 quantum dots†

IF 10.7 2区 材料科学 Q1 CHEMISTRY, PHYSICAL
Jianqiao Liu, Dan Zhao, Xian Wu, Di Wu, Ningning Su, Yang Wang, Fang Chen, Ce Fu, Junsheng Wang and Qianru Zhang
{"title":"Synergistic dual-defect band engineering for highly efficient photocatalytic degradation of microplastics via Nb-induced oxygen vacancies in SnO2 quantum dots†","authors":"Jianqiao Liu, Dan Zhao, Xian Wu, Di Wu, Ningning Su, Yang Wang, Fang Chen, Ce Fu, Junsheng Wang and Qianru Zhang","doi":"10.1039/D4TA07579J","DOIUrl":null,"url":null,"abstract":"<p >The band structure is a crucial consideration in designing semiconductor photocatalysts, particularly as their size has been continuously decreasing over the past few decades. However, the bandgap of nanostructures is usually broadened due to quantum confinement effects, fundamentally inhibiting their photocatalytic performance. Herein, we demonstrate synergistic dual-defect band engineering in SnO<small><sub>2</sub></small> quantum dots. Nb is incorporated to induce the creation of oxygen vacancies in the SnO<small><sub>2</sub></small> crystal lattice. The synergistic mechanism between dual defects is elucidated through their interactive formation and collective contribution of the band structure. Nb impurities establish donor levels within the bandgap, while the gap between donor levels and the conduction band is filled by the induced oxygen vacancies, effectively extending the conduction band edge to the Fermi level. This design of dual-defect engineering not only narrows the bandgap but also provides abundant defect states for electron transitions and increases the lifetimes of photogenerated carriers, thereby facilitating highly efficient visible-light-driven photocatalytic degradation of microplastics, even in realistic aqueous environments. Furthermore, the intermediate products and photodegradation pathways of microplastics are comprehensively elucidated. The synergistic dual-defect band engineering not only achieves highly efficient visible-light-driven photocatalytic degradation of microplastics, but also introduces a comprehensive design framework for tuning band structures in nanoscale photocatalysts.</p>","PeriodicalId":82,"journal":{"name":"Journal of Materials Chemistry A","volume":" 6","pages":" 4429-4443"},"PeriodicalIF":10.7000,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.rsc.org/en/content/articlepdf/2025/ta/d4ta07579j?page=search","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Materials Chemistry A","FirstCategoryId":"88","ListUrlMain":"https://pubs.rsc.org/en/content/articlelanding/2025/ta/d4ta07579j","RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CHEMISTRY, PHYSICAL","Score":null,"Total":0}
引用次数: 0

Abstract

The band structure is a crucial consideration in designing semiconductor photocatalysts, particularly as their size has been continuously decreasing over the past few decades. However, the bandgap of nanostructures is usually broadened due to quantum confinement effects, fundamentally inhibiting their photocatalytic performance. Herein, we demonstrate synergistic dual-defect band engineering in SnO2 quantum dots. Nb is incorporated to induce the creation of oxygen vacancies in the SnO2 crystal lattice. The synergistic mechanism between dual defects is elucidated through their interactive formation and collective contribution of the band structure. Nb impurities establish donor levels within the bandgap, while the gap between donor levels and the conduction band is filled by the induced oxygen vacancies, effectively extending the conduction band edge to the Fermi level. This design of dual-defect engineering not only narrows the bandgap but also provides abundant defect states for electron transitions and increases the lifetimes of photogenerated carriers, thereby facilitating highly efficient visible-light-driven photocatalytic degradation of microplastics, even in realistic aqueous environments. Furthermore, the intermediate products and photodegradation pathways of microplastics are comprehensively elucidated. The synergistic dual-defect band engineering not only achieves highly efficient visible-light-driven photocatalytic degradation of microplastics, but also introduces a comprehensive design framework for tuning band structures in nanoscale photocatalysts.

Abstract Image

协同双缺陷带工程在SnO2量子点中铌诱导氧空位的高效光催化降解微塑料
在设计半导体光催化剂时,带结构是一个重要的考虑因素,特别是在过去几十年中,其尺寸一直在不断减小。然而,由于量子约束效应,纳米结构的带隙通常会变宽,从根本上抑制了它们的光催化性能。在此,我们展示了在SnO2量子点上的协同双缺陷带工程。在SnO2晶格中加入Nb可以诱导氧空位的产生。通过双缺陷的相互作用形成和能带结构的共同贡献,阐明了双缺陷之间的协同机制。Nb杂质在带隙内建立给体能级,而给体能级与导带之间的间隙被诱导的氧空位填充,有效地将导带边缘延伸到费米能级。这种双缺陷工程设计不仅缩小了带隙,而且为电子跃迁提供了丰富的缺陷态,增加了光生载流子的寿命,从而促进了微塑料的高效可见光驱动光催化降解,即使在现实的水环境中也是如此。此外,还对微塑料的中间产物和光降解途径进行了全面的阐述。协同双缺陷能带工程不仅实现了微塑料的高效可见光驱动光催化降解,而且为纳米级光催化剂的能带结构调整提供了一种全面的设计框架。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
求助全文
约1分钟内获得全文 求助全文
来源期刊
Journal of Materials Chemistry A
Journal of Materials Chemistry A CHEMISTRY, PHYSICAL-ENERGY & FUELS
CiteScore
19.50
自引率
5.00%
发文量
1892
审稿时长
1.5 months
期刊介绍: The Journal of Materials Chemistry A, B & C covers a wide range of high-quality studies in the field of materials chemistry, with each section focusing on specific applications of the materials studied. Journal of Materials Chemistry A emphasizes applications in energy and sustainability, including topics such as artificial photosynthesis, batteries, and fuel cells. Journal of Materials Chemistry B focuses on applications in biology and medicine, while Journal of Materials Chemistry C covers applications in optical, magnetic, and electronic devices. Example topic areas within the scope of Journal of Materials Chemistry A include catalysis, green/sustainable materials, sensors, and water treatment, among others.
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
确定
请完成安全验证×
copy
已复制链接
快去分享给好友吧!
我知道了
右上角分享
点击右上角分享
0
联系我们:info@booksci.cn Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术官方微信