Abstract
Pt–TiO2 and Au–TiO2 photocatalysts have been synthetized by a microwave assisted sol-gel method and characterized by means of X-ray diffraction (XRD) techniques and UV-Vis diffuse reflectance spectroscopy. Particle sizes have been determined by means of Scherrer equation. Depending on the weight percentage of dopant, some changes in the band gap energy can be observed. X-ray diffractions patterns were recorded to study the formation of TiO2 crystalline species. The diffraction peaks detected after the calcination process indicate the presence of the crystalline anatase phase and no presence of rutile phase was observed. For the Pt–TiO2 sample, the peaks detected in 2θ (39.4∘, 45.9∘, and 67∘) indicate the presence of particles of metallic platinum. For the Au–TiO2 sample, the peaks detected in 2θ (38∘, 44.2∘, 64.4∘, and 77.2∘) indicate the presence of particles of metallic gold. The Pt-loaded samples have a crystal size slightly smaller than the Au-loaded samples, from 3.09 to 4.74 nm. UV-Vis DSR technique was used to study the influence of metal load and type. The band gap decreases according to the metal load; it shows that at higher metal load (5 %) the band gap changes from 3.2 eV (pure TiO2) to 2.98 eV and 3.04 eV for the samples loaded with gold and platinum, respectively. For the Pt–TiO2 sample, the band gap varies from 3.04 eV (5 wt.%) to 3.2 eV (0.1 wt.%), the same behavior is found on the Au-loaded samples, with a band gap energy variation from 2.98 eV (5 wt.%) to 3.21 eV (0.01 wt.%).
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References
Macwan DP, Dave PN, Chaturvedi S (2011) A review on nano-TiO2 sol–gel type syntheses and its applications. J Mater Sci 11:3669–3686
Pelaez M, Nolan NT, Pillai SC, Seery MK, Falaras P, Kontos AG, Dunlop PSM, Hamilton JWJ, Byrne JA, O’Shea K, Entezari MH, Dionysiou DD (2012) A review on the visible light active titanium dioxide photocatalysts for environmental applications. Appl Catal B Environ 125:331–349
Esquivel K, Nava R, Zamudio-Méndez A, González MV, Jaime-Acuña OE, Escobar-Alarcón L, Peralta-Hernández JM, Pawelec B, Fierro JLG (2013) Microwave-assisted synthesis of (S)Fe/TiO2 systems: effects of synthesis conditions and dopant concentration on photoactivity. Appl Catal B Environ 140:213–224
Khan AW, Ahmad S, Mehedi Hassan M, Naqvi AH (2014) Structural phase analysis, band gap tuning and fluorescence properties of Co doped TiO2 nanoparticles. Opt Mater 38:278–285
Kobayashi Y, Ishii Y, Yamane H, Watanabe K, Koda H, Kunigami H, Kunigami H (2014) Fabrication of TiO2/Pt core–shell particles by electroless metal plating. Colloids Surf Physicochem Eng Asp 448:88–92
Lei XF, Xue XX, Yang H (2014) Preparation and characterization of Ag-doped TiO2 nanomaterials and their photocatalytic reduction of Cr(VI) under visible light. Appl Surf Sci 321:396–403
Liu Q, Ding D, Ning C, Wang X (2015) Black Ni-doped TiO2 photoanodes for high-efficiency photoelectrochemical water-splitting. Int J Hydrog Energy 40:2107–2114
Park H, Park Y, Kim W, Choi W (2013) Surface modification of TiO2 photocatalyst for environmental applications. J Photochem Photobiol Photochem Rev 15:1–20
Sánchez E, López T, Gómez R, Bokhimi, Morales A, Novaro O (1996) Synthesis and characterization of sol–gel Pt/TiO2, catalyst. J Solid State Chem 122:309–314
Patterson AL (1939) The Scherrer formula for X-ray particle size determination. Phys Rev 56:978–982
Escobedo Morales A, Sánchez Mora E, Pal U (2007) Use of diffuse reflectance spectroscopy for optical characterization of un-supported nanostructures. Rev Mex Fis Suppl 53:18–22
Leyva-Porras C, Toxqui-Teran A, Vega-Becerra O, Miki-Yoshida M, Rojas-Villalobos M, García-Guadarrama M, Aguilar-Martinez JA (2015) Low-temperature synthesis and characterization of anatase TiO2 nanoparticles by an acid assisted sol–gel method. J Alloys Compd 647:627–636
Zhang J, Li M, Feng Z, Chen J, Li C (2006) UV raman spectroscopic study on TiO2. Phase transformation at the surface and in the bulk. J Phys Chem B 110:927–935
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Hernández, R., Durón-Torres, S.M., Esquivel, K., Guzmán, C. (2017). Microwave Assisted Sol-Gel Synthesis and Characterization of M–TiO2 (M = Pt, Au) Photocatalysts. In: Pérez Campos, R., Contreras Cuevas, A., Esparza Muñoz, R. (eds) Characterization of Metals and Alloys. Springer, Cham. https://doi.org/10.1007/978-3-319-31694-9_15
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DOI: https://doi.org/10.1007/978-3-319-31694-9_15
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