Hydroxyapatite supported Ag3PO4 nanoparticles with higher visible light photocatalytic activity

Abstract Hydroxyapatite supported Ag 3 PO 4 nanocomposites have been synthesized by a wet impregnation process. UV–vis absorption spectra show a red shift of the absorption edges for the composite systems compared to pure hydroxyapatite support. The surface structure and morphology of the nanocomposites were characterized by Brunauer–Emmett–Teller (BET) apparatus, X-ray diffraction (XRD), transmission electron microscopy (TEM). The results suggest that Ag 3 PO 4 nanoparticles (6–17 nm in diameter) are well dispersed on the hydroxyapatite support and Ag 3 PO 4 nanoparticles density is larger for the higher Ag + loading sample. The as-prepared nanocomposite photocatalysts showed a pronounced photocatalytic activity upon decomposition of methylene blue dye in aqueous solution under both visible light (wavelength > 400 nm) and UV–vis light irradiation. A synergic mechanism of inherent photocatalytic capability of Ag 3 PO 4 and the accelerated electron/hole separation resulting from the photoinduced electrons captured by the slow-released Ag + at the interface of Ag 3 PO 4 and hydroxyapatite is proposed for the nanocomposites on the enhancement of photocatalytic performance in comparison to that of pure Ag 3 PO 4 nanoparticles. The support of hydroxyapatite may also act as an absorbent which favors the mass transfer in heterogeneous photocatalysis reaction.

[1]  C. Pulgarin,et al.  Escherichia coli inactivation by N, S co-doped commercial TiO2 powders under UV and visible light , 2008 .

[2]  Jie Zheng,et al.  Synthesis, characterization, and photocatalytic properties of Ag modified hollow SiO2/TiO2 hybrid microspheres , 2011 .

[3]  T. Coradin,et al.  Mesoporous hydroxyapatites prepared in ethanol–water media: Structure and surface properties , 2007 .

[4]  M. Aramendía,et al.  Modification of the photocatalytic activity of Pd/TiO2 and Zn/TiO2 systems through different oxidative and reductive calcination treatments , 2008 .

[5]  Zhiping Luo,et al.  Enhanced visible-light absorption and dopant distribution of iodine-TiO2 nanoparticles synthesized by a new facile two-step hydrothermal method , 2011 .

[6]  Zhongbiao Wu,et al.  Efficient synthesis of polymeric g-C3N4 layered materials as novel efficient visible light driven photocatalysts , 2011 .

[7]  N. Umezawa,et al.  Facet effect of single-crystalline Ag3PO4 sub-microcrystals on photocatalytic properties. , 2011, Journal of the American Chemical Society.

[8]  Hui Yang,et al.  An orthophosphate semiconductor with photooxidation properties under visible-light irradiation. , 2010, Nature materials.

[9]  J. Qu,et al.  Efficient destruction of bacteria with Ti(IV) and antibacterial ions in co-substituted hydroxyapatite films , 2007 .

[10]  Yingjun Liu,et al.  Visible-Light-Activated Nanoparticle Photocatalyst of Iodine-Doped Titanium Dioxide , 2005 .

[11]  X. Lai,et al.  Carbon-doped TiO2 coating on multiwalled carbon nanotubes with higher visible light photocatalytic activity , 2011 .

[12]  K. Sing.  Reporting physisorption data for gas/solid systems with special reference to the determination of surface area and porosity (Recommendations 1984) , 1985 .

[13]  S. Nozaki,et al.  CdS–ZnO composite nanorods: Synthesis, characterization and application for photocatalytic degradation of 3,4-dihydroxy benzoic acid , 2008 .

[14]  Rui Shi,et al.  Origin of Photocatalytic Activation of Silver Orthophosphate from First-Principles , 2011 .

[15]  Yulong Liao,et al.  Photocatalytic Activity of TiO2 Nanoparticles Sensitized by CuInS2 Quantum Dots , 2011 .

[16]  N. Umezawa,et al.  Theoretical study of high photocatalytic performance of Ag3PO4 , 2011 .

[17]  Peifang Wang,et al.  A simple method for large-scale preparation of ZnS nanoribbon film and its photocatalytic activity for dye degradation , 2010 .

[18]  A. Fujishima,et al.  TiO2 Photocatalysis: A Historical Overview and Future Prospects , 2005 .

[19]  J. A. Santaballa,et al.  Aqueous degradation of diclofenac by heterogeneous photocatalysis using nanostructured materials , 2011 .

[20]  T. Nishikawa,et al.  Synthesis of visible-light active TiO2 photocatalyst with Pt-modification: Role of TiO2 substrate for high photocatalytic activity , 2008 .

[21]  Dionysios D. Dionysiou,et al.  Innovative visible light-activated sulfur doped TiO2 films for water treatment , 2011 .

[22]  J. Weng,et al.  Silver/hydroxyapatite composite coatings on porous titanium surfaces by sol-gel method. , 2011, Journal of biomedical materials research. Part B, Applied biomaterials.

[23]  Zhongyi Jiang,et al.  Improving visible-light photocatalytic activity of N-doped TiO2 nanoparticles via sensitization by Zn porphyrin , 2008 .

[24]  J. Lian,et al.  IR and XPS investigation of visible-light photocatalysis—Nitrogen-carbon-doped TiO 2 film , 2006 .

[25]  J. Herrmann,et al.  Photocatalysis fundamentals revisited to avoid several misconceptions , 2010 .

[26]  Q. Feng,et al.  Visible light sensitization effect of polyaminobenzoate adsorbed on TiO2 nanocrystal surface , 2011 .

[27]  Shengtao Jiang,et al.  The enhanced photocatalytic activity of CdS/TiO2 nanocomposites by controlling CdS dispersion on TiO2 nanotubes , 2011 .

[28]  A. Fedorov,et al.  Photodegradation of ethylene using visible light responsive surfaces prepared from titania nanoparticle slurries , 2005 .

[29]  M. Jaroniec,et al.  Preparation and Enhanced Visible-Light Photocatalytic H2-Production Activity of Graphene/C3N4 Composites , 2011 .

[30]  M. Antonietti,et al.  A metal-free polymeric photocatalyst for hydrogen production from water under visible light. , 2009, Nature materials.

[31]  Karen Wilson,et al.  Hydroxyapatite supported antibacterial Ag3PO4 nanoparticles , 2010 .

[32]  Li Wang,et al.  The release properties of silver ions from Ag-nHA/TiO2/PA66 antimicrobial composite scaffolds , 2010, Biomedical materials.

[33]  M. Wong,et al.  Effect of N2 ion flux on the photocatalysis of nitrogen-doped titanium oxide films by electron-beam evaporation , 2006 .