Journal
APPLIED CATALYSIS A-GENERAL
Volume 502, Issue -, Pages 239-245Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apcata.2015.05.032
Keywords
Graphene oxide; TiO2; Gold nanoparticle; Catalyst; 4-nitrophenol
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Funding
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Science, ICT & Future Planning [2013R1A1A1A05006634]
- Human Resource Training Project for Regional Innovation [2012H1B8A2026225]
- TJ Park junior Faculty Fellowship
- LG Yonam Foundation
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We describe the synthesis of a hybrid nanomaterial comprising a core-shell titanium glycolate-thiolfunctionalized graphene composite (TG@GOS) as a support for the immobilization of gold nanoparticles. TG@GOS was synthesized via the thionation of TG@GO that involved-wrapping of titanium glycolate in graphene oxide. The interaction between gold and sulfur, mainly connected through the thiol functional group, is well known that strong covalent Au-S bond (bond strength similar to 40 kcal/mol) in comparison with other functional group such as hydroxyl and amine. Therefore, we propose that reduced gold ions could easily bind to thiol groups on TG@GOS and grow to nanoparticles using PVP as a surfactant. Herein, titanium glycolate was transformed to TiO2 by hydrolysis. The catalysts (TiO2@GOS@Au) were characterized by TEM, SEM, XRD, UV-vis spectroscopy and tested for the reduction of 4-nitrophenol in the presence of NaBH4. (C) 2015 Elsevier B.V. All rights reserved.
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