MWNT-TiO2:Ni composite catalyst : A new class of catalyst for photocatalytic H2 evolution from water under visible light illumination

Abstract Multi-walled carbon nanotube, TiO 2 and Ni composite catalysts (MWNT–TiO 2 :Ni) were prepared by a modified chemical vapor deposition. The nanoscaled composite materials were extensively characterized by TG, SEM, Raman and UV–vis spectra. The photoactivity of the catalyst for H 2 evolution was investigated in the presence of methanol sacrificial reagent under visible light illumination. The rate of H 2 evolution was 38.1 μmol/h at a weight ratio of MWNT/TiO 2 equal to 4.4%. The experimental results were rationalized by assuming that MWNTs serve as photosensitizer, synergetic with metallic Ni, greatly enhancing the activity of visible light-responsive photocatalyst.

[1]  Y. Fujishiro,et al.  Photocatalytic properties of layered hydrous titanium oxide/CdS ? ZnS nanocomposites incorporating CdS ? ZnS into the interlayer , 1996 .

[2]  P. Serp,et al.  Photocatalytic degradation of phenol on MWNT and titania composite catalysts prepared by a modified sol–gel method , 2005 .

[3]  Jinhua Ye,et al.  Photophysical and Photocatalytic Activities of a Novel Photocatalyst BaZn1/3Nb2/3O3 , 2004 .

[4]  J. Charlier,et al.  Defects in carbon nanotubes. , 2002, Accounts of chemical research.

[5]  J. Kincaid,et al.  Photochemical energy storage in a spatially organized zeolite-based photoredox system , 1997, Nature.

[6]  Jiaguo Yu,et al.  Enhancement of photocatalytic activity of mesoporous TiO2 by using carbon nanotubes , 2005 .

[7]  M. Matsumura,et al.  Splitting of water by electrochemical combination of two photocatalytic reactions on TiO2 particles , 1998 .

[8]  M. Toyoda,et al.  Cyclic Performance of Carbon-Coated TiO2 for Photocatalytic Activity of Methylene Blue Decomposition , 2006, Environmental technology.

[9]  Hironori Arakawa,et al.  Direct splitting of water under visible light irradiation with an oxide semiconductor photocatalyst , 2001, Nature.

[10]  Dongsik Kim,et al.  Hydrogen production by the photocatalytic overall water splitting on NiO/Sr3Ti2O7 : Effect of preparation method , 2006 .

[11]  H. Arakawa,et al.  Effect of Na2CO3 addition on photocatalytic decomposition of liquid water over various semiconductor catalysis , 1994 .

[12]  Jerzy Walendziewski,et al.  Photocatalytic Water Splitting over Pt−TiO2 in the Presence of Sacrificial Reagents , 2005 .

[13]  A. Kudo,et al.  New tantalate photocatalysts for water decomposition into H2 and O2 , 1998 .

[14]  Michael Grätzel,et al.  Efficient panchromatic sensitization of nanocrystalline TiO2 films by a black dye based on a trithiocyanato-ruthenium complex , 1997 .

[15]  W. Maier,et al.  Visible light photodegradation of 4-chlorophenol with a coke-containing titanium dioxide photocatalyst , 2001 .

[16]  Hideki Kato,et al.  Photocatalytic H2 evolution reaction from aqueous solutions over band structure-controlled (AgIn)xZn2(1-x)S2 solid solution photocatalysts with visible-light response and their surface nanostructures. , 2004, Journal of the American Chemical Society.

[17]  Zhongfan Liu,et al.  Iron Catalysts Reactivation for Efficient CVD Growth of SWNT with Base-growth Mode on Surface , 2004 .

[18]  Kenji Toda,et al.  Overall water splitting on (Ga(1-x)Zn(x))(N(1-x)O(x)) solid solution photocatalyst: relationship between physical properties and photocatalytic activity. , 2005, The journal of physical chemistry. B.

[19]  A. Kudo,et al.  Photocatalytic water splitting into H2 and O2 over various tantalate photocatalysts , 2003 .

[20]  P. Oelhafen,et al.  The Influence of Catalyst Chemical State and Morphology on Carbon Nanotube Growth , 2004 .

[21]  Jinhua Ye,et al.  Photophysical and Photocatalytic Properties of MIn0.5Nb0.5O3 (M = Ca, Sr, and Ba) , 2003 .

[22]  Yong-Ming Dai,et al.  Intermetallic catalyst for carbon nanotubes (CNTs) growth by thermal chemical vapor deposition method , 2006 .

[23]  Wendong Wang,et al.  Visible light photodegradation of phenol on MWNT-TiO2 composite catalysts prepared by a modified sol–gel method , 2005 .

[24]  W. Ingler,et al.  Efficient Photochemical Water Splitting by a Chemically Modified n-TiO2 , 2002, Science.

[25]  H. Arakawa,et al.  Photocatalytic decomposition of water and photocatalytic reduction of carbon dioxide over zirconia catalyst , 1993 .