Shape tailored Pd nanoparticles’ effect on the photocatalytic activity of commercial TiO 2

Fodor, Szilvia; Kovács, Gábor; Hernádi, Klára; Danciu, Virginia; Baia, Lucian; Pap, Zsolt

doi:10.1016/j.cattod.2016.11.011

Cited by 16 publications

(12 citation statements)

References 42 publications

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“…thiacloprid, dichlorophenoxy acids) [4,5], herbicides (e.g. phenylurea) [6], phenol [7][8][9][10][11], pharmaceuticals (e.g. paracetamol, diclofenac, ethenzamide) [12,13], organic dyes [14][15][16], furthermore the reactive free radicals formed during the photocatalytic process can also be used efficiently in the removal of various bacteria [17][18][19].…”

Section: Introductionmentioning

confidence: 99%

“…Apart from titanium dioxide's evident advantages the main drawback is its relatively large band gap, which means that undoped titania can only be excited efficiently by UV photons, which limits its practical application possibilities. To overcome this apparent issue great number of approaches have been taken, like doping/modifying with various elements [14,15,[28][29][30] sensitizing with dyes [16,24,31], deposition of noble metals [7,12], or by preparing composites with WO 3 [32] or materials like pyrolytic-or activated char [8]. Despite these attempts, synthesizing a versatile, highly efficient visible light active TiO 2 at low cost remains to be a challenge.…”

Section: Introductionmentioning

confidence: 99%

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Associating low crystallinity with peroxo groups for enhanced visible light active photocatalysts

et al. 2018

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A B S T R A C TIn the present study hydrogen peroxide was applied during the synthesis of titanium dioxide (TiO 2 ) photocatalysts to anchor peroxo groups onto the surface to enhance visible light excitability. The effect of changes in the pH value and crystallization temperature was investigated. As-prepared peroxo-titania were characterized by X-ray diffraction (XRD), diffuse reflectance spectroscopy (DRS), infrared spectroscopy (IR), Raman spectroscopy and X-ray photoelectron spectroscopy (XPS). The photocatalytic activity was investigated using phenol as model contaminant under visible light irradiation. IR and XPS measurements confirmed the presence of peroxo groups in the samples, moreover Raman and XPS measurements showed the formation of amorphous sodium titanate. Photocatalytic activity measurements pointed out, that most efficient as-prepared photocatalyst exceeded the photocatalytic performance of all reference materials. The cause of the enhanced photocatalytic activity was attributed to the enhanced visible light excitability and considerable amount of peroxo groups, which were not stable after the reusability experiments of the photocatalysts, suffering a redox reaction with the relatively high amount of Ti 3+ , resulting Ti 4+ and surface OH groups. Therefore, the loss of peroxo groups and concomitantly photocatalytic activity was observed. (Z. Pap).Catalysis Today xxx (xxxx) xxx-xxx 0920-5861/

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Associating low crystallinity with peroxo groups for enhanced visible light active photocatalysts

et al. 2018

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“…However, the enhancement was just for the P25-based composites, where it was also just up to 1.5 wt.% of added Cu. The enhancement up to 1.5 wt.% is generally demonstrated in the scientific literature for several noble metals, as well, such as Au [10], Pd [48], and Pt [47], and, interestingly, the detrimental effect of metal/noble metal nanoparticles on the photodegradation of organic pollutants was also discussed. It is rather interesting, however, that good H 2 production capacity was observed for the sample which contained 5 wt% of Cu-sample P25-5Cu.…”

Section: Structural and Mechanistic Insights On The Behavior Of Cu Comentioning

confidence: 70%

“…Therefore, the key to explain this anomaly lies in the number of contacts between Cu containing particles and TiO 2 . P25 is made of smaller crystallites (25-40 nm) than AA (~80 nm); therefore, the ratio between the Cu and titania particles is totally different, as demonstrated in our recent papers [47,48]. More precisely, as the anatase particles are twice as large in AA than in P25, therefore, the possibility of contacting a Cu containing particle is high in AA, while in the case of P25, it is low.…”

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confidence: 79%

Application of TiO2-Cu Composites in Photocatalytic Degradation Different Pollutants and Hydrogen Production

et al. 2020

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In the present work, copper nanoparticles were deposited onto the surface of two different commercial titanias (Evonik Aeroxide P25 and Aldrich anatase). During the synthesis, the concentration of copper was systematically varied (0.5%, 1.0%, 1.5%, 5.0%, and 10 wt.%) to optimize the composite-composition. The photocatalytic activity was evaluated under UV-light, using methyl orange and Rhodamine B as model and ketoprofen as real pollutant. For the hydrogen production capacity, oxalic acid was used as the sacrificial agent. The morpho-structural properties were investigated by using XRD (X-ray diffraction), TEM (Transmission Electron Microscopy) DRS (Diffuse Reflectance Spectroscopy), XPS (X-ray Photoelectron Spectroscopy), and SEM-EDX methods (Scanning Electron Microscopy-Energy Dispersive X-ray Analysis). Increasing the copper concentration enhanced the photocatalytic activity for methyl orange degradation in the case of Aldrich anatase-based composites. When the P25-based composites were considered, there was no correlation between the Cu concentration and the activity; but, independently of the base photocatalyst, the composites containing 10% Cu were the best performing materials. Contrarily, for the ketoprofen degradation, increasing the copper concentration deteriorated the photoactivity. For both Aldrich anatase and P25, the best photocatalytic activity was shown by the composites containing 0.5% Cu. For the degradation of Rhodamine B solution, 1.5% of copper nanoparticles was the most suitable. When the hydrogen production capacity was evaluated, the P25-based composites showed higher performance (produced more hydrogen) than the Aldrich anatase-based ones. It was found that Cu was present in four different forms, including belloite (Cu(OH)Cl), metallic Cu, and presumably amorphous Cu(I)- and Cu(II)-based compounds, which were easily convertible among themselves during the photocatalytic processes.

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“…Noble metal nanoparticles (NPs) exhibit many fascinating optical, 1 magnetic, 2 thermal, 3 and electrical 4 properties, which are widely exploited for applications in different fields, such as optoelectronics, 5,6 catalysis, 7,8 sensors, 9,10,11 and biomedicine. 12,13,14 Many of these applications are based on the NPs' remarkable property of strongly enhancing the local electromagnetic near-field.…”

Section: Introductionmentioning

confidence: 99%

Gold nanoparticles functionalized by rhodamine B isothiocyanate: A new tool to control plasmonic effects

Fratoddi

Cartoni

Venditti

et al. 2018

Journal of Colloid and Interface Science

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Gold nanoparticles with an average diameter of 10 nm, functionalized by the dye molecule rhodamine B isothiocyanate, have been synthesized. The resulting material has been extensively characterized both chemically, to investigate the bonding between the dye molecules and the nanoparticles, and physically, to understand the details of the aggregation induced by interaction between dye molecules on different nanoparticles. The plasmonic response of the system has been further characterized by measurement and theoretical simulation of the static UV-Vis extinction spectra of the aggregates produced following different synthesis procedures. The model parameters used in the simulation gave further useful information on the aggregation and its relationship to the plasmonic response. Finally, we investigated the time dependence of the plasmonic effects of the nanoparticles and fluorescence of the dye molecule using an ultrafast pump-probe optical method. By modulating the quantity of dye molecules on the surface of the nanoparticles it was possible to exert fine control over the plasmonic response of nanoparticles.

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Shape tailored Pd nanoparticles’ effect on the photocatalytic activity of commercial TiO 2

Cited by 16 publications

References 42 publications

Associating low crystallinity with peroxo groups for enhanced visible light active photocatalysts

Associating low crystallinity with peroxo groups for enhanced visible light active photocatalysts

Application of TiO2-Cu Composites in Photocatalytic Degradation Different Pollutants and Hydrogen Production

Gold nanoparticles functionalized by rhodamine B isothiocyanate: A new tool to control plasmonic effects

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