Titanium alkoxide induced BiOBr–Bi2WO6 mesoporous nanosheet composites with much enhanced photocatalytic activity

Here we report a facile hydrothermal route for the preparation of BiOBr–Bi2WO6 mesoporous nanosheet composites (MNCs) in the presence of titanium isopropoxide, Ti(OiPr)4. High resolution transmission electron microscopy, X-ray diffraction, nitrogen adsorption/desorption analysis and X-ray photoelectron spectroscopy were employed for structural and composition analyses of the MNCs. The photogenerated charge transfer and photocatalytic activity of BiOBr–Bi2WO6 MNCs were investigated by Kelvin probe force microscopy and UV-vis spectroscopy. We propose mechanisms to illustrate how titanium alkoxide induces the formation of mesoporous nanosheet heterostructures and the enhanced photodecomposition efficiency of the dye under low light intensity illumination. Overall, our results suggest that titanium alkoxide is not only strongly involved in the growth of BiOBr (001) facets, but also plays a critical role in the pore evolution of the product. Kelvin probe force microscopy analysis allows us to conclude that the resulting nanocomposites demonstrate high photogenerated charge mobility and a long lifetime. Dye molecules can be rapidly and thoroughly decomposed with the photocatalyst under very low light intensity illumination. The enhanced photocatalytic activity is attributed to well matched band edge positions of BiOBr and Bi2WO6 and the large specific surface area of the MNCs in view of the incorporation of mesopores and the highly exposed BiOBr (001) facet due to the use of Ti(OiPr)4 during the synthesis. The results presented here are expected to make a contribution toward the development of delicate nanocomposites for photocatalytic water purification and solar energy utilization.

[1]  E. Xie,et al.  WO3 nanoparticles decorated on both sidewalls of highly porous TiO2 nanotubes to improve UV and visible-light photocatalysis , 2013 .

[2]  Jeong Yong Lee,et al.  Preparation and visible-light photocatalysis of hollow rock-salt TiO1-xNx nanoparticles , 2013 .

[3]  Ya-bo Zhu,et al.  Cadmium sulphide quantum dots sensitized hierarchical bismuth oxybromide microsphere with highly efficient photocatalytic activity. , 2013, Journal of colloid and interface science.

[4]  Xiaohong Wang,et al.  Photocatalytic properties of hierarchical structures based on Fe-doped BiOBr hollow microspheres , 2013 .

[5]  Qing Tang,et al.  ZnO–GaN heterostructured nanosheets for solar energy harvesting: computational studies based on hybrid density functional theory , 2013 .

[6]  Y. Sasson,et al.  Hierarchical Nanostructured 3D Flowerlike BiOClxBr1–x Semiconductors with Exceptional Visible Light Photocatalytic Activity , 2013 .

[7]  Binbin Chang,et al.  BiOBr–carbon nitride heterojunctions: synthesis, enhanced activity and photocatalytic mechanism , 2012 .

[8]  Zhen Zhou,et al.  First-principles studies on facet-dependent photocatalytic properties of bismuth oxyhalides (BiOXs) , 2012 .

[9]  Ying Dai,et al.  An anion exchange approach to Bi2WO6 hollow microspheres with efficient visible light photocatalytic reduction of CO2 to methanol. , 2012, Chemical communications.

[10]  P. Edwards,et al.  Unusual reactivity of visible-light-responsive AgBr–BiOBr heterojunction photocatalysts , 2012 .

[11]  Xiaohong Wang,et al.  Efficient visible-light-induced photocatalytic activity over the novel Ti-doped BiOBr microspheres , 2012 .

[12]  Y. Tachibana,et al.  Artificial photosynthesis for solar water-splitting , 2012, Nature Photonics.

[13]  Dereje H. Taffa,et al.  Transformation of organic-inorganic hybrid films obtained by molecular layer deposition to photocatalytic layers with enhanced activity. , 2012, ACS nano.

[14]  F. Besenbacher,et al.  Promotion of phenol photodecomposition over TiO2 using Au, Pd, and Au-Pd nanoparticles. , 2012, ACS nano.

[15]  Yongsheng Chen,et al.  Mechanism of photogenerated reactive oxygen species and correlation with the antibacterial properties of engineered metal-oxide nanoparticles. , 2012, ACS nano.

[16]  T. Tachikawa,et al.  Superstructure of TiO2 Crystalline Nanoparticles Yields Effective Conduction Pathways for Photogenerated Charges. , 2012, The journal of physical chemistry letters.

[17]  Hongzhe Sun,et al.  Facile Microwave Synthesis of 3D Flowerlike BiOBr Nanostructures and Their Excellent CrVI Removal Capacity , 2012 .

[18]  B. Jiang,et al.  Ionothermal synthesis of hierarchical BiOBr microspheres for water treatment. , 2012, Journal of hazardous materials.

[19]  P. Fornasiero,et al.  Nonaqueous synthesis of TiO2 nanocrystals using TiF4 to engineer morphology, oxygen vacancy concentration, and photocatalytic activity. , 2012, Journal of the American Chemical Society.

[20]  Q. Ma,et al.  In situ growth of metal particles on 3D urchin-like WO3 nanostructures. , 2012, Journal of the American Chemical Society.

[21]  Z. Xiong,et al.  Nitrogen-doped titanate-anatase core-shell nanobelts with exposed {101} anatase facets and enhanced visible light photocatalytic activity. , 2012, Journal of the American Chemical Society.

[22]  Jing Jiang,et al.  Synthesis and facet-dependent photoreactivity of BiOCl single-crystalline nanosheets. , 2012, Journal of the American Chemical Society.

[23]  R. Amal,et al.  Progress in Heterogeneous Photocatalysis: From Classical Radical Chemistry to Engineering Nanomaterials and Solar Reactors. , 2012, The journal of physical chemistry letters.

[24]  Yi-Chun Jin,et al.  Solvothermal synthesis of flower-like BiOBr microspheres with highly visible-light photocatalytic performances , 2012 .

[25]  Shuxin Ouyang,et al.  Nano‐photocatalytic Materials: Possibilities and Challenges , 2012, Advanced materials.

[26]  Olivier Jacquet,et al.  Cover Picture: A Diagonal Approach to Chemical Recycling of Carbon Dioxide: Organocatalytic Transformation for the Reductive Functionalization of CO2 (Angew. Chem. Int. Ed. 1/2012) , 2012 .

[27]  S. Linic,et al.  Plasmonic-metal nanostructures for efficient conversion of solar to chemical energy. , 2011, Nature materials.

[28]  W. Meng,et al.  Photocatalytic degradation of tetrabromobisphenol A by mesoporous BiOBr: Efficacy, products and pathway , 2011 .

[29]  H. Chung,et al.  Kelvin probe force microscopy characterization of TiO2 (110)-supported Au clusters , 2011 .

[30]  T. Wu,et al.  Recent developments of metal oxide semiconductors as photocatalysts in advanced oxidation processes (AOPs) for treatment of dye waste-water , 2011 .

[31]  Yinchang Feng,et al.  Synthesis of mesoporous BiOBr 3D microspheres and their photodecomposition for toluene. , 2011, Journal of hazardous materials.

[32]  D. Chadwick,et al.  n-Butanol to iso-butene in one-step over zeolite catalysts , 2011 .

[33]  Yun Jeong Hwang,et al.  Light-induced charge transport within a single asymmetric nanowire. , 2011, Nano letters.

[34]  Lisha Zhang,et al.  Bi2WO6 micro/nano-structures: Synthesis, modifications and visible-light-driven photocatalytic applications , 2011 .

[35]  Ying Dai,et al.  One-pot miniemulsion-mediated route to BiOBr hollow microspheres with highly efficient photocatalytic activity. , 2011, Chemistry.

[36]  Z. Yamani,et al.  Adsorption and degradation performance of Rhodamine B over BiOBr under monochromatic 532 nm pulsed laser exposure , 2011 .

[37]  Ming Ge,et al.  Bi2O3−Bi2WO6 Composite Microspheres: Hydrothermal Synthesis and Photocatalytic Performances , 2011 .

[38]  G. Colón,et al.  Novel Bi(2)WO(6)-TiO(2) heterostructures for Rhodamine B degradation under sunlike irradiation. , 2011, Journal of hazardous materials.

[39]  Yanfen Fang,et al.  Unique ability of BiOBr to decarboxylate d-Glu and d-MeAsp in the photocatalytic degradation of microcystin-LR in water. , 2011, Environmental science & technology.

[40]  Andrew C. Kummel,et al.  Kelvin probe force microscopy and its application , 2011 .

[41]  C. Xie,et al.  Processing-structure-property relationships of Bi2WO6 nanostructures as visible-light-driven photocatalyst. , 2010, Journal of hazardous materials.

[42]  Chuncheng Chen,et al.  Semiconductor-mediated photodegradation of pollutants under visible-light irradiation. , 2010, Chemical Society reviews.

[43]  P. Edwards,et al.  The hydrothermal synthesis of BiOBr flakes for visible-light-responsive photocatalytic degradation of methyl orange , 2010 .

[44]  Wen Lai Huang,et al.  Electronic structures and optical properties of BiOX (X = F, Cl, Br, I) via DFT calculations , 2009, J. Comput. Chem..

[45]  Ling Zhang,et al.  Preparation of BiOBr lamellar structure with high photocatalytic activity by CTAB as Br source and template. , 2009, Journal of hazardous materials.

[46]  Jianhua Yang,et al.  Visible-light-responsive photocatalysts xBiOBr–(1−x)BiOI , 2008 .

[47]  H. Fu,et al.  Photocatalytic properties of nanosized Bi2WO6 catalysts synthesized via a hydrothermal process , 2006 .

[48]  Mehmet Sarikaya,et al.  Nanoindentation and adhesion of sol-gel-derived hard coatings on polyester , 2000 .

[49]  C. Brinker,et al.  Sol-Gel Science: The Physics and Chemistry of Sol-Gel Processing , 1990 .

[50]  S. Lippard,et al.  Conferences and Meetings , 1969, British medical journal.