Gram-scale production of graphene oxide-TiO2 nanorod composites: Towards high-activity photocatalytic materials

被引:147
作者
Liu, Jincheng [1 ]
Liu, Lei [1 ]
Bai, Hongwei [1 ]
Wang, Yinjie [1 ]
Sun, Darren D. [1 ]
机构
[1] Nanyang Technol Univ, Sch Civil & Environm Engn, Singapore 639798, Singapore
基金
新加坡国家研究基金会;
关键词
Graphene oxide; TiO2; Nanorod; Composites; Gram-scale; Two-phase; TIO2-GRAPHENE NANOCOMPOSITES; TIO2; NANOCRYSTALS; GRAPHITE OXIDE; NANOPARTICLES; GAS; MONODISPERSE; ELIMINATION; DEGRADATION; PERFORMANCE; SHEETS;
D O I
10.1016/j.apcatb.2011.05.007
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Here we present a simple two-phase assembling method to produce high-quality graphene oxide-TiO2 nanorod composites (GO-TiO2 NRCs) on gram scale. TiO2 nanorods dispersed in toluene are synthesized from a facile two-phase hydrothermal method. The effective attachment of TiO2 nanorods on the whole GO sheets at the water-toluene interface is confirmed by Transmission Electron Microscope (TEM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). The as-synthesized TiO2 nanorods show a slightly higher efficiency in the photocatalytic degradation of C. I. Acid Orange 7 (AO 7) irradiated under UV light (lambda = 254nm) and higher antibacterial activity under simulated sunlight than that of TiO2 nanoparticles with the same diameter. After combined with graphene oxide (GO), the GO-TiO2 NRCs show much higher photocatalytic activities than that of TiO2 nanorods alone and the GO-TiO2 nanoparticle composites (GO-TiO2 NPCs). The ratio of TiO2 and GO has no evident effect on the photocatalytic activity of GO-TiO2 NRCs when all the TiO2 nanorods are anchored on the GO sheets. The higher photocatalytic activity of GO-TiO2 NRCs is ascribed to the anti-charge recombination and the more (1 0 1) facets. Considering the superior photocatalytic activity of GO-TiO2 NRCs and the fact that they can been easily mass-produced, we expect this material may find important applications in environmental engineering and other fields. (C) 2011 Elsevier B.V. All rights reserved.
引用
收藏
页码:76 / 82
页数:7
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