Flexible polyaniline-coated TiO₂/SiO₂ nanofiber membranes with enhanced visible-light photocatalytic degradation performance.

A simple and practical strategy has been developed for preparing polyaniline (PANi) coated TiO2/SiO2 nanofiber membranes by a combination of electrospinning, calcination and in situ polymerization. TiO2/SiO2 (TS) nanofibers are fabricated by electrospinning, followed by calcination. Then they are used as template for in situ polymerization of aniline monomers. SEM images show that PANi nanoparticles thus formed can be densely and uniformly coated on the surface of TS nanofibers. Photocatalytic degradation tests show that the as-prepared nanofiber membranes exhibit enhanced photocatalytic activity for degradation of methyl orange under visible light, which may be due to the synergistic effect of PANi and TiO2. Furthermore, the effect of polymerization time on the morphology and photocatalytic activity of the membrane is investigated. The free-standing membrane is flexible and easy to handle, which is promising for potential applications in photocatalysis and water remediation fields.

[1]  Y. Shul,et al.  Photocatalytic Properties of Silica-supported TiO2 , 2005 .

[2]  W. Wang,et al.  Adsorption of Cu(II) from aqueous solution by anatase mesoporous TiO2 nanofibers prepared via electrospinning. , 2012, Journal of colloid and interface science.

[3]  John B. Shoven,et al.  I , Edinburgh Medical and Surgical Journal.

[4]  Guang Shao,et al.  A facile route to ultra-long polyaniline nanowires and the fabrication of photoswitch. , 2009, Journal of colloid and interface science.

[5]  D. Zhao,et al.  Excellent photocatalytic degradation activities of ordered mesoporous anatase TiO2-SiO2 nanocomposites to various organic contaminants. , 2012, Journal of hazardous materials.

[6]  Y. Miao,et al.  Electrically conductive polyaniline/polyimide nanofiber membranes prepared via a combination of electrospinning and subsequent in situ polymerization growth. , 2013, ACS applied materials & interfaces.

[7]  Y. Xiong,et al.  Photodegradation of phenol in a polymer-modified TiO2 semiconductor particulate system under the irradiation of visible light , 2007 .

[8]  G. Lu,et al.  Fabrication of Graphene/Polyaniline Composite Paper via In Situ Anodic Electropolymerization for High-Performance Flexible Electrode. , 2009, ACS nano.

[9]  K. Klabunde,et al.  Synthesis, characterization, and visible light activity of new nanoparticle photocatalysts based on silver, carbon, and sulfur-doped TiO2. , 2007, Journal of colloid and interface science.

[10]  D. Zhao,et al.  Synchronous role of coupled adsorption and photocatalytic oxidation on ordered mesoporous anatase TiO2-SiO2 nanocomposites generating excellent degradation activity of RhB dye , 2010 .

[11]  H. Zeng,et al.  Multifunctional Roles of TiO2 Nanoparticles for Architecture of Complex Core−Shells and Hollow Spheres of SiO2−TiO2−Polyaniline System , 2009 .

[12]  Jincai Zhao,et al.  Dramatic visible photocatalytic degradation performances due to synergetic effect of TiO2 with PANI. , 2008, Environmental science & technology.

[13]  Younan Xia,et al.  A highly reactive and sinter-resistant catalytic system based on platinum nanoparticles embedded in the inner surfaces of CeO2 hollow fibers. , 2012, Angewandte Chemie.

[14]  M. Wan,et al.  Polyaniline/TiO2 Composite Nanotubes , 2003 .

[15]  J. C. Soares,et al.  Structural characterization of Chloride Salt of conducting polyaniline obtained by XRD, SAXD, SAXS and SEM , 2013 .

[16]  C. M. Li,et al.  Constructing hierarchical spheres from large ultrathin anatase TiO2 nanosheets with nearly 100% exposed (001) facets for fast reversible lithium storage. , 2010, Journal of the American Chemical Society.

[17]  Zhibin Yang,et al.  Hierarchical composites of polyaniline-graphene nanoribbons-carbon nanotubes as electrode materials in all-solid-state supercapacitors. , 2013, Nanoscale.

[18]  Shuijian He,et al.  Supercapacitors based on 3D network of activated carbon nanowhiskers wrapped-on graphitized electrospun nanofibers , 2013 .

[19]  Qun Chen,et al.  Cobalt ferrite–polyaniline heteroarchitecture: a magnetically recyclable photocatalyst with highly enhanced performances , 2012 .

[20]  Q. Wei,et al.  Structures and properties of SnO2 nanofibers derived from two different polymer intermediates , 2013, Journal of Materials Science.

[21]  N. Kim,et al.  Effects of surface modification on the dispersion and electrical conductivity of carbon nanotube/polyaniline composites , 2009 .

[22]  Bin Ding,et al.  Amphiphobic Nanofibrous Silica Mats with Flexible and High-Heat-Resistant Properties , 2010 .

[23]  Andreas Greiner,et al.  Electrospinning: a fascinating method for the preparation of ultrathin fibers. , 2007, Angewandte Chemie.

[24]  A. Fujishima,et al.  Fibrous TiO2-SiO2 nanocomposite photocatalyst. , 2006, Chemical communications.

[25]  S. Ramakrishna,et al.  Novel hollow mesoporous 1D TiO2 nanofibers as photovoltaic and photocatalytic materials. , 2012, Nanoscale.

[26]  G. G. Stokes.  "J." , 1890, The New Yale Book of Quotations.

[27]  J. Buisson,et al.  Theoretical and experimental vibrational study of emeraldine in salt form. Part II , 2000 .

[28]  Shuijian He,et al.  Needle-like polyaniline nanowires on graphite nanofibers: hierarchical micro/nano-architecture for high performance supercapacitors , 2012 .

[29]  Hongzheng Chen,et al.  Polyaniline nanowires on TiO2 nano/microfiber hierarchical nano/microstructures: Preparation and their photocatalytic properties , 2011 .

[30]  Danzhen Li,et al.  Highly Efficient Photocatalytic Degradation of Organic Pollutants by PANI-Modified TiO2 Composite , 2012 .

[31]  R. Xiong,et al.  Polypyrrole-decorated Ag-TiO2 nanofibers exhibiting enhanced photocatalytic activity under visible-light illumination. , 2013, ACS applied materials & interfaces.

[32]  Andrew G. Glen,et al.  APPL , 2001 .

[33]  W. Sigmund,et al.  Flexible ceramic nanofibermat electrospun from TiO2–SiO2 aqueous sol , 2012 .

[34]  Zhiyu Jiang,et al.  A green and facile synthesis of TiO2/graphene nanocomposites and their photocatalytic activity for hydrogen evolution , 2012 .

[35]  Yichun Liu,et al.  In situ generation of well-dispersed ZnO quantum dots on electrospun silica nanotubes with high photocatalytic activity. , 2012, ACS applied materials & interfaces.

[36]  Chulki Kim,et al.  Morphology and crystalline phase study of electrospun TiO2–SiO2 nanofibres , 2003 .

[37]  Seung Goo Lee,et al.  Preparation of SiO2/TiO2 composite fibers by sol–gel reaction and electrospinning , 2007 .

[38]  Hara,et al.  Cobalt Ion-Doped TiO(2) Photocatalyst Response to Visible Light. , 2000, Journal of colloid and interface science.

[39]  Yulin Deng,et al.  Synthesis of TiO2-polyaniline core-shell nanofibers and their unique UV photoresponse based on different photoconductive mechanisms in oxygen and non-oxygen environments. , 2013, Chemical communications.

[40]  Xuehong Lu,et al.  Covalently bonded polyaniline/fullerene hybrids with coral-like morphology for high-performance supercapacitor , 2012 .

[41]  R. Ullah,et al.  Strategies of making TiO2 and ZnO visible light active. , 2009, Journal of hazardous materials.

[42]  S. Ramakrishna,et al.  Tunable hierarchical TiO2 nanostructures by controlled annealing of electrospun fibers: formation mechanism, morphology, crystallographic phase and photoelectrochemical performance analysis , 2011 .