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Photocatalytic Nanocomposite Films Fabricated by Layer‐by‐Layer Self‐assembly of TiO 2 Nanoparticles and Lignosulfonates
Author(s) -
Li Hui,
Fu Shiyu,
Peng Lincai,
Zhan Huaiyu
Publication year - 2012
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.201100488
Subject(s) - nanocomposite , x ray photoelectron spectroscopy , methyl orange , chemical engineering , anatase , photocatalysis , nanoparticle , chemistry , atomic layer deposition , layer by layer , titanium dioxide , absorbance , materials science , thin film , nanotechnology , organic chemistry , chromatography , engineering , catalysis
Photocatalytic multilayer nanocomposite films composed of anatase TiO 2 nanoparticles and lignosulfonates (LS) were fabricated on quartz slides by the layer‐by‐layer (LBL) self‐assembly technique. X‐ray photoelectron spectroscopy (XPS), UV‐vis spectroscopy and atomic force microscopy (AFM) were used to characterize the TiO 2 /LS multilayer nanocomposite films. Moreover, the photocatalytic properties (decomposition of methyl orange and bacteria) of multilayer nanocomposite films were investigated. XPS results indicated that the intensities of titanium and sulfur peaks increased with the LBL deposition process. A linear increase in absorbance at 280 nm was found by UV‐Vis spectroscopy, suggesting that stepwise multilayer growth occurs on the substrate and this deposition process is highly reproducible. AFM images showed that quartz slide was completely covered by TiO 2 nanoparticles when a 10‐bilayer multilayer film was formed. The decomposition efficiency of methyl orange by TiO 2 /LS multilayer films under the same UV irradiation time increased linearly with the number of TiO 2 layers, and the results of decomposition of bacteria under UV irradiation showed that TiO 2 /LS multilayer nanocomposite films exhibited excellent decomposition activity of bacteria ( Escherichia coil ).