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Effects of the acid pretreated multi-walled carbon nanotubes on the photocatalytic capacity of TiO2/multi-walled carbon nanotubes nanocomposites

Effects of the acid pretreated multi-walled carbon nanotubes on the photocatalytic capacity of TiO2/multi-walled carbon nanotubes nanocomposites

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This Letter investigates the effect of the acid pretreated multi-walled carbon nanotubes (MWNTs) on the photocatalytc activity of TiO2/MWNTs nanocomposites prepared by sol–gel process. Synthesised nanocomposite materials were characterised by X-ray diffraction (XRD), Brunauer–Emmett–Teller (BET) adsorption analysis, photoluminescence (PL) spectroscopy and transmittance electron microscopy (TEM). The photocatalytic capacities of the nanocomposites were determined by the oxidation of NO over the photocatalyst under UV light. Results indicate that the nanocomposite's efficiency of NOx photodegradation increases (from 20.5 to 34.3%), as the acid pretreatment time increases from 0 to 4 h. The optimal acid pretreatment time for the photoactivity of nanocomposite was 4 h. This Letter shows the acid pretreatment time plays an important role in determining the physicochemical properties of materials, as it consequently influences the photocatalytic capacity of TiO2/MWNTs nanocomposites.

Inspec keywords: photochemistry; sol-gel processing; photoluminescence; oxidation; catalysis; titanium compounds; carbon nanotubes; nanocomposites

Other keywords: nanocomposites; TiO2-C; UV light; Brunauer-Emmett-Teller adsorption; TEM; MWNT; X-ray diffraction; transmittance electron microscopy; photoluminescence spectroscopy; multiwalled carbon nanotubes; photocatalytsis; sol-gel process; photodegradation; acid pretreatment time; oxidation; XRD

Subjects: Heterogeneous catalysis at surfaces and other surface reactions; Surface treatment and degradation of composites; Structure of graphene and graphene-related materials; Photochemistry and radiation chemistry; Methods of nanofabrication and processing

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