Dual-quantum-dots heterostructure with confined active interface for promoted photocatalytic NO abatement

Fengyi Zhong; Chaowei Yuan; Ye He; Yanjuan Sun; Jianping Sheng; Fan Dong

doi:10.1016/j.jhazmat.2022.129463

Dual-quantum-dots heterostructure with confined active interface for promoted photocatalytic NO abatement

J Hazard Mater. 2022 Sep 15:438:129463. doi: 10.1016/j.jhazmat.2022.129463. Epub 2022 Jun 25.

Authors

Fengyi Zhong¹, Chaowei Yuan², Ye He³, Yanjuan Sun¹, Jianping Sheng⁴, Fan Dong¹

Affiliations

¹ Yangtze Delta Region Institute (Huzhou), University of Electronic Science and Technology of China, Huzhou 313001, Zhejiang, China; College of Environment and Resources & Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 611731, China.
² College of Environment and Ecology, Chongqing University, Chongqing 400044, China.
³ College of Environment and Resources & Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 611731, China.
⁴ Yangtze Delta Region Institute (Huzhou), University of Electronic Science and Technology of China, Huzhou 313001, Zhejiang, China; College of Environment and Resources & Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 611731, China. Electronic address: jpshengchn@163.com.

PMID: 35780741
DOI: 10.1016/j.jhazmat.2022.129463

Abstract

Constructing heterostructure is an effective way to fabricate advanced photocatalysts. However, the catalytic performance of typical common multi-dimensional bulk heterostructure still suffers from the limited active interface and inefficient carrier migration. Herein, we successfully synthesize the SnO₂/Cs₃Bi₂I₉ dual-quantum-dots nanoheterostructure (labeled as SCX, X = 1, 2, 3) for efficiently and stably photocatalytic NO removal under visible light irradiation. The NO removal rate of SC2 is almost 8 and 17 times higher than that of the single SnO₂ and Cs₃Bi₂I₉, respectively. Moreover, the SC2 photocatalyst shows only 3 % attenuation after five consecutive cycles, demonstrating good photocatalytic stability. Systematic experimental characterization and theoretical density functional theory calculations revealed that the high activity and stability of SCX originated from the efficient charge transfer at the confined interface between SnO₂ and Cs₃Bi₂I₉ quantum dots. This work provides a new perspective for constructing innovative dual-quantum-dots nanoheterostructure and assesses their potential in photocatalytic environmental applications.

Keywords: Cs(3)Bi(2)I(9); Dual-quantum-dots; NO removal; Nanoheterostructure; Photocatalysis.