Effect of Pt or Pd doping on stability of TiO2 nanoparticle suspension in water

Suttiponparnit, Komkrit; Tiwari, Varun; Sahu, Manoranjan; Biswas, Pratim; Suvachittanont, Sirikalaya; Charinpanitkul, Tawatchai

doi:10.1016/j.jiec.2012.07.017

Cited by 9 publications

(4 citation statements)

References 23 publications

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“…Another feature to highlight in Figure 4(c) is that longer amounts of Pd provoke secondary phases formation (Pd and PdO) with an important crystal size (∼232 nm); whilst independent of the quantity of Pt added to TiO 2 , the crystallite size of the formed secondary phases are lower than 10 nm. The results pointed out that the synthesis parameters and preparation method more than noble metal content play a key role in the composition of structural phases and crystal sizes [34,35].…”

Section: Resultsmentioning

confidence: 99%

Influence of Phases Content on Pt/TiO₂, Pd/TiO₂Catalysts for Degradation of 4-Chlorophenol at Room Temperature

Garc

a-Zaleta

Torres‐Huerta

et al. 2016

Journal of Nanomaterials

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Different Pt/TiO2and Pd/TiO2catalysts were prepared by sol-gel method. The influence of different amounts of noble metals (1–5 mol-%) present on the microstructure as well as the photocatalytic property under 4-chlorophenol degradation was evaluated. The anatase phase was favored at low Pt content; however, the apparition of new phases after 3 mol-% (PtO) suggests a saturation lattice considering our solubility limit at 1 mol-%. Similar trend was observed when Pd was added to the TiO2lattice. The as-prepared catalysts were deeply characterized by X-ray diffraction (XRD) with the Rietveld Method, Raman spectroscopy, high resolution scanning electron microscopy (HRSEM), scanning transmission electron microscopy (STEM), Brunauer-Emmett-Teller (BET) adsorption analysis, and X-Ray photoelectron spectroscopy (XPS). Unit-cell parameter of TiO2phases varied from 30 to 93 vol-% depending on the amount of Pt or Pd added to the composite. HRTEM and HRSEM identified the phases in the catalysts and confirmed the nanometric size and morphology of the catalysts. An improvement in removal efficiency of 4-chlorophenol was obtained in all the specimens compared with the commercial Degussa P25, which can be explained in terms of phase composition and modification of the band gap.

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Section: Resultsmentioning

confidence: 99%

Influence of Phases Content on Pt/TiO₂, Pd/TiO₂Catalysts for Degradation of 4-Chlorophenol at Room Temperature

Garc

a-Zaleta

Torres‐Huerta

et al. 2016

Journal of Nanomaterials

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“…The improvement of TiO 2 :Er-Yb dispersion with ultrasonication compared to the pure TiO 2 can be attributed to the influence of Er 3+ and Yb 3+ ions that change the electronic structure, surface charge behavior and surface reactivity, which is demonstrated through the increasing in BET surface area showed previously that generates a high surface reactivity. Also, TiO 2 :Er-Yb results in a positive charge imbalance, therefore, active acidic sites will be formed, increasing the amount of hydroxyl groups absorbed [59]. Thereby, nanoparticles are expected to be modified by the surface complexity which affects the intrinsic stability and provides agglomeration in agreement with [59,60].…”

Section: Dispersion With Ultrasonic Assistance and Doping Effectmentioning

confidence: 99%

“…Also, TiO 2 :Er-Yb results in a positive charge imbalance, therefore, active acidic sites will be formed, increasing the amount of hydroxyl groups absorbed [59]. Thereby, nanoparticles are expected to be modified by the surface complexity which affects the intrinsic stability and provides agglomeration in agreement with [59,60].…”

Section: Dispersion With Ultrasonic Assistance and Doping Effectmentioning

confidence: 99%

Synthesis of upconversion TiO2:Er3+-Yb3+ nanoparticles and deposition of thin films by spin coating technique

Trabelsi

Mercier

Blanquet

et al. 2020

Ceramics International

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In this work, a simple, low temperature (T<300°C) procedure suitable to increase the efficiency of solar cell and optoelectronic devices through reducing the mismatch with solar spectrum in the infrared range is proposed. TiO 2 co-doped with rare earth ions is a promising candidate for its use in optical field due to the possibility to expand the spectral absorption range. Here, pure and Er 3+ -Yb 3+ co-doped anatase-TiO 2 nano-spherical particles (diameter < 50 nm) with high surface area (125.7 m 2 /g and 140.6 m 2 /g for the pure and co-doped, respectively), good crystallinity are prepared by hydrothermal-assisted sol-gel method, followed by their dispersion and deposition as thin films. The nanoparticles are characterized by studying their structural, morphology, surface chemical compositions and photoluminescent properties. From the dispersion study, results showed that the optimal conditions were obtained for co-doped TiO 2 at operational pH=3 and with 20 min as a suitable duration of ultrasonication. The co-doped TiO 2 nanoparticles showed excellent upconversion properties (green and red emissions) at room temperature under 980 nm excitation. To extend this result towards optoelectronic and photonic applications, the upconversion nanoparticles are deposited at the surface of n-type (100) Si wafer using a spincoating process. From scanning electron microscopy, it is observed that the entire surface of substrate is covered with a uniform film composed of compact arrangement of small nanoparticles with a good adhesion on Si surface, also the resulting 750 nm thick TiO 2 :Er-Yb film maintained the upconversion luminescence phenomena.

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“…Somehow, the formation of a double layer under this condition favours a better adsorption of anionic substances, which can ampliate the reaction performance due to an increased local concentration of organic matter on the sites of production of oxidant radicals (Du et al, 2013;Oliveira et al, 2012;Suttiponparnit et al, 2013). Moreover, the distribution of TiO 2 polymorphs also has an influence on the characteristics and photoactivity of the surface, where the presence of oxygen vacancy and other defects contribute significantly (Carp et al, 2004).…”

Section: Zeta Potential-estimation Of the Isoelectric Pointmentioning

confidence: 99%

Quantum Efficiency of Hydroxyl Radical Formation in a Composite Containing Nanocrystalline TiO2 e Zinc Phthalocyanine, and the Nature of the Incident Radiation

Batista¹,

Souza²,

Maximiano³

et al. 2013

JMSR

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In this study, we investigate the generation of hydroxyl radicals mediated by a composite containing TiO 2 and 1.6% m/m of zinc phthalocyanine (TiO 2 /ZnPc) in aqueous suspensions containing methanol as oxidisable substrate. The composite features a specific surface 20% less than the value estimated for TiO 2 P25, probably due to the covering of the surface of the oxide by ZnPc and the pH of the isoelectric point of this composite equal of 5.5, about two units of pH lower than the value estimated for TiO 2 P25, are probably related to the difference in photocatalytic activity found for these materials. To assess the influence of different spectral bands of electromagnetic radiation on the production of hydroxyl radicals, we used different sources of radiation in experiments conducted to estimate the quantum efficiency of hydroxyl radical formation (HO•), via photocatalytic oxidation of methanol. The association between zinc phthalocyanine and TiO 2 has allowed the formation of a light absorber material with absorption spectral range extended to the visible region. Our results suggest that, despite the higher values of  HO• for TiO 2 P25, the combination of visible and ultraviolet radiation furnished by a high pressure mercury lamp without the protective bulb, or solar radiation, causes the composite to present good values for the same parameter.

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Effect of Pt or Pd doping on stability of TiO2 nanoparticle suspension in water

Cited by 9 publications

References 23 publications

Influence of Phases Content on Pt/TiO₂, Pd/TiO₂Catalysts for Degradation of 4-Chlorophenol at Room Temperature

Influence of Phases Content on Pt/TiO₂, Pd/TiO₂Catalysts for Degradation of 4-Chlorophenol at Room Temperature

Synthesis of upconversion TiO2:Er3+-Yb3+ nanoparticles and deposition of thin films by spin coating technique

Quantum Efficiency of Hydroxyl Radical Formation in a Composite Containing Nanocrystalline TiO2 e Zinc Phthalocyanine, and the Nature of the Incident Radiation

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Effect of Pt or Pd doping on stability of TiO2 nanoparticle suspension in water

Cited by 9 publications

References 23 publications

Influence of Phases Content on Pt/TiO2, Pd/TiO2Catalysts for Degradation of 4-Chlorophenol at Room Temperature

Influence of Phases Content on Pt/TiO2, Pd/TiO2Catalysts for Degradation of 4-Chlorophenol at Room Temperature

Synthesis of upconversion TiO2:Er3+-Yb3+ nanoparticles and deposition of thin films by spin coating technique

Quantum Efficiency of Hydroxyl Radical Formation in a Composite Containing Nanocrystalline TiO2 e Zinc Phthalocyanine, and the Nature of the Incident Radiation

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Influence of Phases Content on Pt/TiO₂, Pd/TiO₂Catalysts for Degradation of 4-Chlorophenol at Room Temperature

Influence of Phases Content on Pt/TiO₂, Pd/TiO₂Catalysts for Degradation of 4-Chlorophenol at Room Temperature