β-MnO2 nanowires: A novel ozonation catalyst for water treatment

Abstract Using Mn(NO 3 ) 2 and ozone as raw materials, β-MnO 2 nanowires with diameters of about 6–12 nm, lengths of 2–5 μm and surface area of 73.54 m 2  g −1 were synthesized by a simple hydrothermal process. The influences of synthesis conditions such as hydrothermal temperature, reaction time and ozone were investigated, and the growth process of β-MnO 2 nanowires was discussed. The catalytic properties of β-MnO 2 nanowires for the degradation of phenol were evaluated. β-MnO 2 nanowires revealed good separability and remarkable catalysis for the degradation of phenol.

[1]  L.X. Yang,et al.  ZnO–SnO2 Hollow Spheres and Hierarchical Nanosheets: Hydrothermal Preparation, Formation Mechanism, and Photocatalytic Properties , 2007 .

[2]  Jin-Song Hu,et al.  Mass production and high photocatalytic activity of ZnS nanoporous nanoparticles. , 2005, Angewandte Chemie.

[3]  X. Ni,et al.  Large-area synthesis of high-quality β-MnO2 nanowires and the mechanism of formation through a facile mineralization process , 2005, Nanotechnology.

[4]  Yadong Li,et al.  Selected-Control Hydrothermal Synthesis of α- and β-MnO2 Single Crystal Nanowires , 2002 .

[5]  J. Rusling,et al.  Electrochemical catalysis of styrene epoxidation with films of MnO(2) nanoparticles and H(2)O(2). , 2004, Journal of the American Chemical Society.

[6]  M. Hoffmann,et al.  Sonochemical Decomposition of Phenol: Evidence for a Synergistic Effect of Ozone and Ultrasound for the Elimination of Total Organic Carbon from Water , 2006 .

[7]  P. Maggard,et al.  Hydrothermal Synthesis and Photocatalytic Activities of SrTiO3‐Coated Fe2O3 and BiFeO3 , 2006 .

[8]  F. Beltrán,et al.  Preparation and structural characterization of Co/Al2O3 catalysts for the ozonation of pyruvic acid , 2007 .

[9]  Haoshen Zhou,et al.  Synthesis of single-crystal manganese dioxide nanowires by a soft chemical process , 2005, Nanotechnology.

[10]  Shihong Xu,et al.  Preparations and photocatalytic properties of magnetically separable nitrogen-doped TiO2 supported on nickel ferrite , 2007 .

[11]  S. Ghosh,et al.  Shape-Selective Synthesis, Magnetic Properties, and Catalytic Activity of Single Crystalline β-MnO2 Nanoparticles , 2007 .

[12]  B. Tang,et al.  Novel dandelion-like beta-manganese dioxide microstructures and their magnetic properties , 2006, Nanotechnology.

[13]  Xiao Ya Hu,et al.  Simple hydrothermal preparation of γ-MnOOH nanowires and their low-temperature thermal conversion to β-MnO2 nanowires , 2005 .

[14]  Jingtang Zheng,et al.  Catalytic ozonation of phenolic wastewater with activated carbon fiber in a fluid bed reactor. , 2007, Journal of colloid and interface science.

[15]  Zeheng Yang,et al.  Large-scale synthesis of β-MnO2 nanorods and their rapid and efficient catalytic oxidation of methylene blue dye , 2006 .

[16]  Heechul Choi,et al.  Catalytic decomposition of ozone and para-Chlorobenzoic acid (pCBA) in the presence of nanosized ZnO , 2006 .

[17]  J. Leckie,et al.  One-step fabrication and high photocatalytic activity of porous TiO2 hollow aggregates by using a low-temperature hydrothermal method without templates. , 2007, Chemistry.

[18]  M. L. Curri,et al.  UV-induced photocatalytic degradation of azo dyes by organic-capped ZnO nanocrystals immobilized onto substrates , 2005 .

[19]  S. Martin,et al.  Environmental Applications of Semiconductor Photocatalysis , 1995 .

[20]  Barbara Kasprzyk-Hordern,et al.  Catalytic ozonation and methods of enhancing molecular ozone reactions in water treatment , 2003 .

[21]  Jun Chen,et al.  Facile controlled synthesis of MnO2 nanostructures of novel shapes and their application in batteries. , 2006, Inorganic chemistry.

[22]  Y. Qian,et al.  Nanorods of manganese oxides: Synthesis, characterization and catalytic application , 2006 .

[23]  M. S. Hegde,et al.  Photocatalytic degradation of organic compounds over combustion-synthesized nano-TiO2. , 2004, Environmental science & technology.

[24]  Yadong Li,et al.  Synthesis and formation mechanism of manganese dioxide nanowires/nanorods. , 2003, Chemistry.

[25]  M. Fernández-García,et al.  Nanosized Ti–V mixed oxides: Effect of doping level in the photo-catalytic degradation of toluene using sunlight-type excitation , 2007 .

[26]  You-chang Xie,et al.  Photocatalytic properties of phosphor-doped titania nanoparticles , 2007 .

[27]  Jian Dou,et al.  Template-free low temperature hydrothermal synthesis and characterization of rod-shaped manganese oxyhydroxides and manganese oxides , 2007 .

[28]  Yuming Dong,et al.  A facile route to controlled synthesis of Co3O4 nanoparticles and their environmental catalytic properties , 2007 .

[29]  M. Jekel,et al.  Decomposition of aqueous ozone in the presence of aromatic organic solutes. , 2005, Water research.

[30]  M. Fernández-García,et al.  Structure and activity of nanosized iron-doped anatase TiO2 catalysts for phenol photocatalytic degradation , 2007 .

[31]  W. Stickle,et al.  Handbook of X-Ray Photoelectron Spectroscopy , 1992 .

[32]  Sylwia Mozia,et al.  A new photocatalytic membrane reactor (PMR) for removal of azo-dye Acid Red 18 from water , 2005 .

[33]  F. Wang,et al.  Promotion of H2O2 decomposition activity over β-MnO2 nanorod catalysts , 2007 .

[34]  M. Temperini,et al.  Substrate development for surface-enhanced Raman study of photocatalytic degradation processes: Congo red over silver modified titanium dioxide films , 2006 .

[35]  G. Pantaleo,et al.  Oxidative degradation properties of Co-based catalysts in the presence of ozone , 2007 .