Aligned macroporous TiO2/chitosan/reduced graphene oxide (rGO) composites for photocatalytic applications

Chao Chen, Yan Zhang, Jing Zeng, Fuqiang Zhang, Kechao Zhou, Christopher Bowen, Dou Zhang

Research output: Contribution to journalArticle

13 Citations (Scopus)
151 Downloads (Pure)

Abstract

In this article ice templating is used to fabricate novel TiO2/chitosan/reduced graphene oxide (rGO) composites with a highly aligned macroporous structure for photocatalytic applications. The structure of the composites was readily tailored using the composite composition, for example the lamellar pore width decreased from 50–45 to 5–10 μm, while the lamellar thickness increased from 2–3 to 20–25 μm, with an increase of the TiO2 content from 45 to 77 vol%. Lamellar pore channels between the layers exhibited a more uniform distribution when the rGO content was 1.0 wt%. The increase in viscosity of the composites with high TiO2 contents led to the formation of smaller ice crystals and smaller lamellar pore sizes to enable the production of composite structures with improved mechanical strength. The TiO2/chitosan/rGO composites exhibited excellent photocatalytic degradation of methyl orange and the photocatalytic efficiency was optimized by control of the active material content and microstructure. The hybrid composites with 1.0 wt% rGO showed a degradation percentage of 97%, which makes these novel TiO2/chitosan/rGO freeze cast structures attractive materials as high performance and high strength substrates for photocatalytic degradation applications.
Original languageEnglish
Pages (from-to)170-176
JournalApplied Surface Science
Volume424
Issue number2
Early online date20 Feb 2017
DOIs
Publication statusPublished - 1 Dec 2017

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