Silver doped titanium dioxide nanomaterials for enhanced visible light photocatalysis

Seery, Michael K.; George, R.P.; Floris, Patrick; Pillai, Suresh C.

doi:10.1016/j.jphotochem.2007.02.010

Cited by 567 publications

(361 citation statements)

References 46 publications

(28 reference statements)

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“…4. The spectrum of ZnO precursor dried at 80 • C revealed bands at ∼3500 cm −1 contributed to the presence of OH stretching bonds [24]. Moreover another distinct band originating from C H bonds has been observed at 2936 cm −1 and symmetric and asymmetric stretching bands of acetate species at 1658 cm −1 , 1319 cm −1 ( COO ), and 815 cm −1 ( COO ) [23].…”

Section: Resultsmentioning

confidence: 93%

“…Moreover another distinct band originating from C H bonds has been observed at 2936 cm −1 and symmetric and asymmetric stretching bands of acetate species at 1658 cm −1 , 1319 cm −1 ( COO ), and 815 cm −1 ( COO ) [23]. After calcination at 500 • C, the intensity of the bands associated with the presence of organic residue was significantly reduced and a strong peak at ∼450 cm −1 attributed to Zn O bond became apparent [23,24]. It was also noted that the peak at 2936 cm −1 is predominant in the pure ZnO sample compared to the F-doped samples due to the presence of unburned carbon from the precursors.…”

Section: Resultsmentioning

confidence: 97%

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Antibacterial properties of F-doped ZnO visible light photocatalyst

Podporska-Carroll

Myles

Quilty

et al. 2017

Journal of Hazardous Materials

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201

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Section: Resultsmentioning

confidence: 93%

Section: Resultsmentioning

confidence: 97%

Antibacterial properties of F-doped ZnO visible light photocatalyst

Podporska-Carroll

Myles

Quilty

et al. 2017

Journal of Hazardous Materials

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201

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“…35,37 However, migration of the Ag + ions from bulk anatase grains to the anatase grain surface can occur during calcination. 35,37 With Ag migrating to the TiO 2 surface, surface defects in the anatase grains will increase. This results in a greater number of nucleation sites for the formation of rutile, again, promoting phase transformation.…”

Section: Resultsmentioning

confidence: 99%

“…36 This group previously showed enhanced visible light photocatalysis with Ag modified TiO 2 . 37 Choi et al controlled the ratio of anatase and rutile phases through the addition of surfactants. 38 The effect of precursor chelation on anatase to rutile transition has also been reported previously.…”

Section: Introductionmentioning

confidence: 99%

A Systematic Study of the Effect of Silver on the Chelation of Formic Acid to a Titanium Precursor and the Resulting Effect on the Anatase to Rutile Transformation of TiO₂

et al. 2010

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Anatase to rutile transition in an unmodified synthetic titania usually occurs at a temperature range of 600-700°C. Various methods such as addition of metallic and nonmetallic dopants and modifying the precursor have previously been reported to influence the anatase to rutile transition temperature. In the current study, the effect of addition of increasing amounts of silver to the extent of chelation of a formate group to a titanium precursor and the resulting effects on the transformation of anatase to rutile has been studied. The addition of silver (0, 1, 3, and 5 mol %) on the anatase to rutile transformation temperature has been systematically followed by Fourier transform infrared (FTIR), Raman, X-ray diffraction (XRD), differential scanning calorimetry, and X-ray photoelectron spectroscopy (XPS) studies. From the FTIR and Raman spectroscopy studies it was observed that the incorporation of silver caused a reduction in the intensity of the COO -stretches indicating that the titania formate bridging complex is becoming weaker in the presence of silver. XRD studies indicated an early rutile formation for the silver-doped samples. XRD of the samples calcined at 700°Cshowed that 5 mol % Ag TiO 2 contained both anatase (46%) and rutile (54%), whereas the undoped sample primarily consists of anatase (95%). At 800°C all silver doped samples converted to 100% rutile and the undoped TiO 2 consisted of both anatase (55%) and rutile (45%). XPS analysis showed that Ag 0 and Ag 2 O has been formed on the surface of the titania formate complex without calcination (>100°C) indicating that photo-oxidation has occurred. FTIR, Raman, and XPS studies confirmed that the presence of silver in the xerogel before calcination may be responsible for the reduction of the titanium formate bridge. It was concluded that the presence of silver (Ag 2 O and Ag 0 ) hindered bridging ligands, which resulted in a weakened titanium gel network. This structurally weakened gel network could easily be collapsed during calcination, and it favors an early rutile formation.

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“…The optimized Ag modification concentration is determined at Ag:Ti molar ratio of 1:50 [15]. Though such studies are available in literature for Au and Pt, fewer attempts is made for the deposition of Ag [13,[16][17][18][19][20]. The nitrogen dopant concentration was optimized for 0.15 at.% which shows better photocatalytic activity as reported earlier [21].…”

Section: Introductionmentioning

confidence: 99%

Synergistic effect of Ag deposition and nitrogen doping in TiO2 for the degradation of phenol under solar irradiation in presence of electron acceptor

Devi¹,

Nagaraj²,

Rajashekhar³

2012

Chemical Engineering Journal

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a b s t r a c tAg deposited nitrogen doped TiO 2 (Ag-TiO 2−x N x ) was prepared using sol gel titania by grinding it with stoichiometric amount of Urea as nitrogen source followed by the photoreduction of Ag + to Ag 0 . These samples were characterized by powder X-ray diffraction (PXRD), UV-visible absorption spectroscopy, Fourier transformed infrared spectroscopy (FTIR), photoluminescence (PL) and scanning electron microscope (SEM). PL analysis of the samples indicated that the electron-hole recombination has been effectively inhibited after the Ag deposition on TiO 2 and TiO 2−x N x . Ag-TiO 2−x N x exhibits much higher visible-light photocatalytic activity when compared with N-doped or pristine TiO 2 . The catalysts along with the oxidants can accelerate electron transfer process and inhibit the fast electron-hole recombination. The observed high process efficiency (˚) of Ag-TiO 2−x N x particles compared to TiO 2−x N x and pure TiO 2 photocatalyst can be accounted to the synergistic effect of Ag loading along with N doping. Strongly interacting electron accepting species such as hydrogen peroxide and ammonium persulphate chemisorbed at the photocatalyst surface are said to act like surface states enabling inelastic transfer of electrons from the conduction band to the oxidizing species. The electronic states of different energies within the band gap have a major role in enhancing the efficiency.

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Silver doped titanium dioxide nanomaterials for enhanced visible light photocatalysis

Cited by 567 publications

References 46 publications

Antibacterial properties of F-doped ZnO visible light photocatalyst

Antibacterial properties of F-doped ZnO visible light photocatalyst

A Systematic Study of the Effect of Silver on the Chelation of Formic Acid to a Titanium Precursor and the Resulting Effect on the Anatase to Rutile Transformation of TiO₂

Synergistic effect of Ag deposition and nitrogen doping in TiO2 for the degradation of phenol under solar irradiation in presence of electron acceptor

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Silver doped titanium dioxide nanomaterials for enhanced visible light photocatalysis

Cited by 567 publications

References 46 publications

Antibacterial properties of F-doped ZnO visible light photocatalyst

Antibacterial properties of F-doped ZnO visible light photocatalyst

A Systematic Study of the Effect of Silver on the Chelation of Formic Acid to a Titanium Precursor and the Resulting Effect on the Anatase to Rutile Transformation of TiO2

Synergistic effect of Ag deposition and nitrogen doping in TiO2 for the degradation of phenol under solar irradiation in presence of electron acceptor

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A Systematic Study of the Effect of Silver on the Chelation of Formic Acid to a Titanium Precursor and the Resulting Effect on the Anatase to Rutile Transformation of TiO₂