Green preparation of tuneable carbon-silica composite materials from wastes

Tengyao Jiang, Vitaliy L. Budarin, Peter S. Shuttleworth, Gary Ellis, Christopher M A Parlett, Karen Wilson, Duncan J. Macquarrie, Andrew J. Hunt*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Bio-oil has successfully been utilized to prepare carbon-silica composites (CSCs) from mesoporous silicas, such as SBA-15, MCM-41, KIT-6 and MMSBA frameworks. These CSCs comprise a thin film of carbon dispersed over the silica matrix and exhibit porosity similar to the parent silica. The surface properties of the resulting materials can be simply tuned by the variation of preparation temperatures leading to a continuum of functionalities ranging from polar hydroxyl rich surfaces to carbonaceous aromatic surfaces, as reflected in solid state NMR, XPS and DRIFT analysis. N<inf>2</inf> porosimetry, TEM and SEM images demonstrate that the composites still possess similar ordered mesostructures to the parent silica sample. The modification mechanism is also proposed: silica samples are impregnated with bio-oils (generated from the pyrolysis of waste paper) until the pores are filled, followed by the carbonization at a series of temperatures. Increasing temperature leads to the formation of a carbonaceous layer over the silica surface. The complex mixture of compounds within the bio-oil (including those molecules containing alcohols, aliphatics, carbonyls and aromatics) gives rise to the functionality of the CSCs.

Original languageEnglish
Pages (from-to)14148-14156
Number of pages9
JournalJournal of Materials Chemistry A
Issue number27
Early online date21 May 2015
Publication statusPublished - 21 Jul 2015

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