18January2018

Nano-Micro Letters

Simultaneous Detection and Removal of Formaldehyde at Room Temperature: Janus Au@ZnO@ZIF-8 Nanoparticles

Dawei Wang1, Zhiwei Li4, Jian Zhou3, Hong Fang3, Xiang He1, Puru Jena3, Jing-Bin Zeng2,*, Wei-Ning Wang1,*

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Nano-Micro Lett. (2018) 10: 4

First Online: 5 September 2017 (Article)

DOI:10.1007/s40820-017-0158-0

*Corresponding author. E-mail: xmuzjb@163.com;wnwang@vcu.edu

 

Abstract

 


Fig. 6 Time-resolved DRIFTS spectra on a Sample I, b Sample II, and c Sample III. d Their corresponding kinetics of HCHO adsorption (Solid symbols), the blue curve represents the production kinetic of formic acid for sample II. e Enhancement of local electromagnetic field of Au@ZnO NPs. f Proposed mechanism of oxidation of HCHO into HCOOH

The detection and removal of volatile organic compounds (VOCs) are of great importance to reduce the risk of indoor air quality concerns. This study reports the rational synthesis of a dual-functional Janus nanostructure and its feasibility for simultaneous detection and removal of VOCs. The Janus nanostructure was synthesized via an anisotropic growth method, composed of plasmonic nanoparticles, semiconductors, and metal organic frameworks (e.g., Au@ZnO@ZIF-8). It exhibits excellent selective detection to formaldehyde (HCHO, as a representative VOC) at room temperature over a wide range of concentrations (from 0.25 to 100 ppm), even in the presence of water and toluene molecules as interferences. In addition, HCHO was also found to be partially oxidized into non-toxic formic acid simultaneously with detection. The mechanism underlying this technology was unraveled by both experimental measurements and theoretical calculations: ZnO maintains the conductivity while ZIF-8 improves the selective gas adsorption; the plasmonic effect of Au nanorods enhances the visible-light driven photocatalysis of ZnO at room temperature.


 

Keywords

Indoor air quality; Volatile organic compounds; Janus structure; Metal organic frameworks; Plasmonic nanoparticles

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