Preparation of polypyrrole/TiO2 nanocomposites with enhanced photocatalytic performance--颗粒学报PARTICUOLOGY

Gao, F., Hou, X., Wang, A., Chu, G., Wu, W., Chen, J., & Zou, H. (2016). Preparation of polypyrrole/TiO2 nanocomposites with enhanced photocatalytic performance. Particuology, 26, 73-78. https://doi.org/10.1016/j.partic.2015.07.003

Preparation of polypyrrole/TiO₂ nanocomposites with enhanced photocatalytic performance

Fei Gao, Xianhui Hou, Aolan Wang, Guangwen Chu, Wei Wu ^*, Jianfeng Chen, Haikui Zou

State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, China

10.1016/j.partic.2015.07.003

Volume 26, June 2016, Pages 73-78

Received 17 April 2015, Revised 22 June 2015, Accepted 17 July 2015, Available online 13 January 2016, Version of Record 18 April 2016.

E-mail: wuwei@mail.buct.edu.cn

Highlights

• In situ oxidation polymerization was used to prepare PPy/TiO₂ nanocomposites.

• The composites exhibited photocatalytic activity for CO₂ reduction.

• The composites were used as photocatalyst for Rhodamine B degradation.

Abstract

A simple in situ method was developed to synthesize polypyrrole (PPy)/TiO₂ nanocomposites having high photocatalytic activity under simulated solar light. The structure and morphology of the PPy/TiO₂ nanocomposites were characterized by X-ray powder diffraction (XRD), transmission electron microscopy, UV–vis diffuse reflectance spectroscopy, and Fourier transform infrared spectroscopy. The visible light photocatalytic properties of the nanocomposites were demonstrated by Rhodamine B degradation and by the production of methanol from CO₂. The XRD analysis showed that the coating of PPy did not change the crystallinity of the TiO₂. The UV–vis diffuse reflectance spectra indicated that the light adsorption range of the TiO₂ was enlarged after modification. Energy-dispersive X-ray spectroscopy analysis confirmed the presence of PPy and TiO₂ in the nanocomposite catalyst. The RhB degradation using the nanocomposites was increased by 41% and the methanol yield was enhanced by 34 wt% in comparison with those obtained with pure TiO₂. The improvements were considered to originate from the increased separation efficiency of hole–electron pairs from TiO₂ and the enhancement of the light adsorption range by the introduced PPy.

Graphical abstract

Keywords

PPy/TiO₂; Polypyrrole (PPy); Nanocomposite; Photodegradation; Methanol

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