Very efficient composite titania membranes in hybrid ultrafiltration/photocatalysis water treatment processes

Abstract Composite TiO2 photocatalytic ultrafiltration (UF) membranes were developed through chemical vapour layer-by-layer deposition (LBL/CVD) of TiO2. The technique comprised chemisorption or physisorption of the titanium isopropoxide (TTIP) vapour and a subsequent oxidative treatment in order to promote the precursor condensation and generate new adsorption sites for the accomplishment of the successive adsorption/surface reaction steps. Both membrane sides were covered with TiO2 photocatalyst without affecting the high water recovery efficiency. For reasons of comparison, one of the membranes was prepared through TiO2 nanoparticle growth (NPG/CVD), a procedure extensively studied in a previous work of our group. The membrane efficiency in photo degradation of methyl orange was evaluated in an innovative continuous flow reactor, applying UV irradiation on the annular and bore surfaces. The membranes developed through the physisorption path were highly efficient in the decomposition of azo-dye pollutant, exhibiting low adsorption-fouling tendency and high water permeability.

[1]  G. Meng,et al.  Preparation and properties of supported 100% titania ceramic membranes , 2008 .

[2]  Dionysios D. Dionysiou,et al.  Nanocrystalline TiO2 Photocatalytic Membranes with a Hierarchical Mesoporous Multilayer Structure: Synthesis, Characterization, and Multifunction , 2006 .

[3]  L. Cot,et al.  Chapter 1 General overview, trends and prospects , 1996 .

[4]  Richard M. Lueptow,et al.  Controlling biofilm growth using reactive ceramic ultrafiltration membranes , 2009 .

[5]  J. Jokiniemi,et al.  Deposition of nanostructured titania films by particle-assisted MOCVD , 2005 .

[6]  S. Balaji,et al.  Phonon confinement studies in nanocrystalline anatase‐TiO2 thin films by micro Raman spectroscopy , 2006 .

[7]  Kyong-Sop Han,et al.  Preparation and thermal stability of doped TiO2 composite membranes by the sol–gel process , 1998 .

[8]  J. Nolan,et al.  Application of an innovative mercury intrusion technique and relative permeability to examine the thin layer pores of sol–gel and CVD post-treated membranes , 2007 .

[9]  P. Yue,et al.  Preparation of heterogeneous photocatalyst (TiO2/Alumina) by metallo-organic chemical vapor deposition , 1999 .

[10]  Polycarpos Falaras,et al.  Superhydrophilicity and photocatalytic property of nanocrystalline titania sol–gel films , 2007 .

[11]  H. Sarpoolaky,et al.  Titania ultrafiltration membrane: Preparation, characterization and photocatalytic activity , 2009 .

[12]  G. Romanos,et al.  Comparative study of the rate and locality of silica deposition during the CVD treatment of porous membranes with TEOS and TMOS , 2009 .

[13]  Enrico Drioli,et al.  Photocatalytic membrane reactors for degradation of organic pollutants in water , 2001 .

[14]  S. Oyama,et al.  Permeation properties and hydrothermal stability of silica―titania membranes supported on porous alumina substrates , 2009 .

[15]  Paul F. Greenfield,et al.  Synthesis of anatase TiO2 supported on porous solids by chemical vapor deposition , 2001 .

[16]  N. Vaenas,et al.  Visible light induced wetting of nanostructured N-F co-doped titania films , 2011, Photochemical & photobiological sciences : Official journal of the European Photochemistry Association and the European Society for Photobiology.

[17]  H. A. Amar,et al.  Photocatalytic oxidation of methyl orange in presence of titanium dioxide in aqueous suspension. Part II: kinetics study , 2005 .

[18]  P. Bruzzi,et al.  Mathematical modelling of photomineralization of phenols in aqueous solution, by photocatalytic membranes immobilizing titanium dioxide☆ , 1996 .

[19]  E. Favvas,et al.  Investigating the evolution of N2 transport mechanism during the cyclic CVD post-treatment of silica membranes , 2008 .

[20]  I. Yeom,et al.  Pilot plant study of an ultrafiltration membrane system fordrinking water treatment operated in the feed-and-bleed mode , 2005 .

[21]  Kai Zhang,et al.  Influence of cross-flow velocity on membrane performance during filtration of biological suspension , 2005 .

[22]  C. Vandecasteele,et al.  Alumina and titania multilayer membranes for nanofiltration: preparation, characterization and chemical stability , 2002 .

[23]  T. Maschmeyer,et al.  Mesoporous Membranes—A Brief Overview of Recent Developments , 2004 .

[24]  A. Arora,et al.  Raman spectroscopy of optical phonon confinement in nanostructured materials , 2007 .

[25]  Kai Zhang,et al.  Effect of Permeate Flux and Tangential Flow on Membrane Fouling for Wastewater Treatment , 2005 .

[26]  E. Favvas,et al.  Development and characterization of silica-based membranes for hydrogen separation , 2008 .

[27]  Yunfeng Lu,et al.  Dual-Layer Asymmetric Microporous Silica Membranes , 2000 .

[28]  A. Burggraaf.  General overview, trends and prospects , 1996 .

[29]  G. Romanos,et al.  Development and characterization of chemically stabilized ionic liquid membranes-Part I: Nanoporous ceramic supports , 2010 .

[30]  S. Kwak,et al.  Hybrid organic/inorganic reverse osmosis (RO) membrane for bactericidal anti-fouling. 1. Preparation and characterization of TiO2 nanoparticle self-assembled aromatic polyamide thin-film-composite (TFC) membrane. , 2001, Environmental science & technology.

[31]  H. Hahn,et al.  Nanocrystalline Titania Films and Particles by Chemical Vapor Synthesis , 2000 .

[32]  D. Krishnaiah,et al.  Preparation of titanium dioxide photocatalyst loaded onto activated carbon support using chemical vapor deposition: a review paper. , 2008, Journal of hazardous materials.

[33]  G. Romanos,et al.  Double-side active TiO2-modified nanofiltration membranes in continuous flow photocatalytic reactors for effective water purification. , 2012, Journal of hazardous materials.

[34]  Elias Stathatos,et al.  Photocatalytic TiO2 films and membranes for the development of efficient wastewater treatment and reuse systems , 2007 .

[35]  F. Maury,et al.  Atmospheric pressure MOCVD of TiO2 thin films using various reactive gas mixtures , 2004 .

[36]  P. Bruzzi,et al.  Mathematical modelling of pilot-plant photomineralization of chlorophenols in aqueous solution, by photocatalytic membranes immobilizing titanium dioxide , 1997 .

[37]  P. Schmuki,et al.  Self-Organized Anodic TiO2 Nanotube Arrays Functionalized by Iron Oxide Nanoparticles , 2009 .

[38]  Y. S. Lin.  Microporous and dense inorganic membranes: Current status and prospective , 2000 .

[39]  P. Falaras,et al.  Photocatalytic properties of screen-printed titania , 2007 .

[40]  P. Schmuki,et al.  Phase Composition, Size, Orientation, and Antenna Effects of Self-Assembled Anodized Titania Nanotube Arrays : A Polarized Micro-Raman Investigation , 2008 .

[41]  F. Maury,et al.  Optimization of the Vaporization of Liquid and Solid CVD Precursors: Experimental and Modeling Approaches , 2007 .