Continuous hydrothermal synthesis of extensive 2D sodium titanate (Na2Ti3O7) nano-sheets.

A novel and rapid and continuous hydrothermal route to the synthesis of extensive ultra-thin 2D sodium titanate (Na(2)Ti(3)O(7)) nano-sheets using a superheated water flow at 450 degrees C and 24.1 MPa as a crystallizing medium is described. High resolution electron microscopy of the sheets revealed that they were a few layers thick and largely uncurled, highly crystalline despite their very short time under hydrothermal flow conditions. The sodium titanate sheets possessed excellent photocatalytic activity for decolourisation of methylene blue dye.

[1]  Ihtesham ur Rehman,et al.  Screening tests for the evaluation of nanoparticle titania photocatalysts , 2009 .

[2]  Jincai Zhao,et al.  Photooxidative N-demethylation of methylene blue in aqueous TiO2 dispersions under UV irradiation , 2001 .

[3]  V. Colvin,et al.  Shape matters , 2003, Nature materials.

[4]  J. Renault,et al.  The use of standard deviation of X-ray diffraction lines as a measure of broadening in the Scherrer equation: a curve fitting method , 1972 .

[5]  S. Andersson,et al.  The crystal structure of Na2Ti3O7 , 1961 .

[6]  N. Sano,et al.  A step towards length control of titanate nanotubes using hydrothermal reaction with sonication pretreatment , 2008, Nanotechnology.

[7]  K. Kumar,et al.  Langmuir–Hinshelwood kinetics – A theoretical study , 2008 .

[8]  D. Bavykin,et al.  The effect of hydrothermal conditions on the mesoporous structure of TiO2 nanotubes , 2004 .

[9]  G. Meng,et al.  Preparation and photocatalytic activity of alkali titanate nano materials A2TinO2n+1 (A=Li, Na and K) , 2007 .

[10]  A. S. Araujo,et al.  A study on the structure and thermal stability of titanate nanotubes as a function of sodium content , 2006 .

[11]  I. Kiricsi,et al.  Photosensitization of ion-exchangeable titanate nanotubes by CdS nanoparticles , 2004 .

[12]  Koichi Niihara,et al.  Formation of titanium oxide nanotube , 1998 .

[13]  Kathryn Thompson,et al.  Direct continuous hydrothermal synthesis of high surface area nanosized titania , 2009 .

[14]  J. Herrmann,et al.  Photocatalytic degradation pathway of methylene blue in water , 2001 .

[15]  B. Bunker,et al.  Raman Spectroscopic Studies of Silicotitanates , 2000 .

[16]  Sun-Jae Kim,et al.  Preparation and photocatalytic activity of nanotubes obtained from titanium dioxide , 2008 .

[17]  Zhensheng Jin,et al.  TEM study on the formation mechanism of sodium titanate nanotubes , 2007 .

[18]  Paul Boldrin,et al.  Instant nano-hydroxyapatite: a continuous and rapid hydrothermal synthesis. , 2006, Chemical communications.

[19]  W. Li,et al.  Effect of annealing temperature on morphology, structure and photocatalytic behavior of nanotubed H2Ti2O4(OH)2 , 2004, 1009.2926.

[20]  L. Juang,et al.  Effects of sodium content on the microstructures and basic dye cation exchange of titanate nanotubes , 2008 .

[21]  Sun-Jae Kim,et al.  Effect of post treatments on the structure and thermal stability of titanate nanotubes , 2006 .

[22]  Isaac Abrahams,et al.  Direct syntheses of mixed ion and electronic conductors La4Ni3O10 and La3Ni2O7 from nanosized coprecipitates , 2007 .

[23]  Jonathan C. Knowles,et al.  Synthesis and characterisation of magnesium substituted calcium phosphate bioceramic nanoparticles made via continuous hydrothermal flow synthesis , 2008 .

[24]  Jawwad A. Darr,et al.  Direct Synthesis of Nanosized NiCo2O4 Spinel and Related Compounds via Continuous Hydrothermal Synthesis Methods , 2007 .

[25]  Martin Vickers,et al.  High-throughput continuous hydrothermal synthesis of an entire nanoceramic phase diagram. , 2009, Journal of combinatorial chemistry.

[26]  Lianmao Peng,et al.  The structure of trititanate nanotubes. , 2002, Acta crystallographica. Section B, Structural science.

[27]  Jonathan C. Knowles,et al.  Photocatalytic activities of N-doped nano-titanias and titanium nitride , 2009 .

[28]  V. Meynen,et al.  The influence of temperature on the structural behaviour of sodium tri- and hexa-titanates and their protonated forms , 2005 .

[29]  Jawwad A. Darr,et al.  New Directions in Inorganic and Metal-Organic Coordination Chemistry in Supercritical Fluids. , 1999, Chemical reviews.

[30]  S. Hodgson,et al.  Synthesis and characterisation of nanotubular titanates and titania , 2006 .

[31]  Xiaodong Wang,et al.  Study on composition, structure and formation process of nanotube Na2Ti2O4(OH)2 , 2003 .

[32]  K. Giannakopoulos,et al.  One-dimensional titanate nanostructures : Synthesis and characterization , 2007 .

[33]  Yadong Li,et al.  Synthesis and characterization of ion-exchangeable titanate nanotubes. , 2003, Chemistry.