Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/61478
Title: Role of hydroxylation modification on the structure and property of reduced graphene oxide/TiO2 hybrids
Authors: Cao, S
Liu, T
Tsang, Y 
Chen, C
Keywords: Heterojunctions
Reduced graphene oxide
Surface hydroxylation
Ti3+
TiO2
Issue Date: 2016
Publisher: North-Holland
Source: Applied surface science, 2016, v. 382, p. 225-235 How to cite?
Journal: Applied surface science 
Abstract: To extend the spectra response of TiO2 and enhance its photocatalytic activity, surface modification and catalyst supporter have attracted great attention. In this report, a simple and versatile approach has been developed to hydroxylate the reduced graphene oxide/TiO2 hybrids (OH-rGO/TiO2) by UV-microwave method, and the enhanced mechanisms of hydroxylation were analyzed in details. Experimental results show that TiO2 nanocrystals@OH-TiO2 heterojunctions formed on rGO sheets in situ by UV/H2O2 process. Hydroxylation not only can induce many surface defects (Ti3+, O vacancy and Ti-OH) on the surface of TiO2, but also change the color into yellow and strengthen the interaction between rGO and TiO2. OH-rGO/TiO2 hybrids showed excellent durability for high-concentration dyes, and exhibited strong adsorbability and photocatalytic activity. These enhancements are attributed to the excellent property of rGO and surface defects of TiO2 induced by hydroxylation, which expand the light absorption up to 600 nm, benefit to the self-dispersion of hybrids, and improve the adsorption dynamic and charge transfer with lower carrier's recombination.
URI: http://hdl.handle.net/10397/61478
ISSN: 0169-4332
EISSN: 1873-5584
DOI: 10.1016/j.apsusc.2016.04.138
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