The photocatalytic activity of 2.5wt% Cu-doped TiO2 nano powders synthesized by mechanical alloying

Park, Ha Sung; Kim, Dong Hyun; Kim, Sun Jae; Lee, Kyung Sub

doi:10.1016/j.jallcom.2005.07.055

Cited by 80 publications

(37 citation statements)

References 14 publications

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“…Therefore, the extent of structure defection increased with increasing Cu concentration. Park et al (2006) reported a similar observation. Fig.…”

Section: Characteristics Of Cu-doped Tio 2 Nanoparticlessupporting

confidence: 63%

“…Choi et al (1994) reported that metal ion dopants in the TiO 2 crystalline matrix influence photoreactivity, charge carrier recombination rates, and interfacial electron-transfer rates. Other studies doped TiO 2 with metals such as Fe (Oh et al, 2003), Al (Choi et al, 2007), and Cu (Chiang et al, 2002;Zhang et al, 2004;Slamet et al, 2005;Colón et al, 2006;Park et al, 2006;Araña et al, 2008;Xin et al, 2008;Yoong et al, 2009) to improve the reactivity and kinetics of the catalyst. These results support that only select transition metals, including Cu 2+ , can virtually inhibit electron-hole recombination to improve the catalyst (Butler and Davis, 1993;Araña et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

“…Several works have shown that Cu-doped TiO 2 nanoparticles can be fabricated via liquid-phase syntheses (e.g., impregnation and sol-gel) (Chiang et al, 2002;Slamet et al, 2005;Colón et al, 2006;Araña et al, 2008;Xin et al, 2008;Yoong et al, 2009) or vapor-phase syntheses (e.g., sputtering and evaporation condensation) (Zhang et al, 2004;Park et al, 2006). The fabrication process affects the purity and surface properties of the resulting TiO 2 nanoparticles, which subsequently influence the photocatalytic properties.…”

Section: Introductionmentioning

confidence: 99%

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Preparation of Cu-Doped TiO2 Photocatalyst with Thermal Plasma Torch for Low-Concentration Mercury Removal

Tsai

Hsi

Kuo

et al. 2013

Aerosol Air Qual. Res.

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A high-quality, Cu-doped TiO 2 photocatalyst was prepared via a single-step process using an atmospheric-pressure plasma torch system. Degussa P-25 was thermally doped with Cu at Cu/(Cu + TiO 2 ) ratios of 0-5 wt.%. The raw and resulting nanoparticles were characterized using TEM, XRD, UV-Vis, and XPS. TEM showed that the particle size of plasma-treated TiO 2 was generally < 50 nm. 67-75% of the resulting particles, by number were between 10 and 20 nm. The remaining particles were < 10 nm (~10%) and between 20 and 30 nm (~10%). The XRD results showed that Cu doping decreased the anatase/rutile crystalline ratio compared to untreated P-25. Nevertheless, the greater the amount of Cu added, the greater the anatase/rutile ratio was for the Cu-doped TiO 2 . The UV-Vis results showed that the absorption wavelength for plasma-treated TiO 2 extended to the visible light range, especially for TiO 2 doped with 5 wt.% Cu.

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“…Therefore, the extent of structure defection increased with increasing Cu concentration. Park et al (2006) reported a similar observation. Fig.…”

Section: Characteristics Of Cu-doped Tio 2 Nanoparticlessupporting

confidence: 63%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Preparation of Cu-Doped TiO2 Photocatalyst with Thermal Plasma Torch for Low-Concentration Mercury Removal

Tsai

Hsi

Kuo

et al. 2013

Aerosol Air Qual. Res.

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“…Nanocrystalline Nd 12 Fe 82 B 6 (atomic ratio) alloy powders with Nd 2 Fe 14 B/α-Fe two-phase structure were prepared by Gang et al [115] by HDDR combined with mechanical milling. The results showed that, by milling in hydrogen for 20 h, the matrix Nd 2 Fe 14 B phase of the alloy was fully disproportionated into a nano-structured mixture of Nd 2 H 5 , Fe 2 B, and α-Fe phases with average size of about 8 nm, and that a subsequent desorption-recombination treatment at 760℃ for 30 min led to the formation of Nano-sized Cu-doped TiO 2 powders were prepared by Park et al [116] using mechanical alloying. Nanocrystalline Cu-doped TiO 2 powders were prepared by MM and homogeneous precipitation process at low temperature (HPPLT).…”

Section: Some Other Nanomaterials and Nano Compositesmentioning

confidence: 99%

Mechanical Milling: a Top Down Approach for the Synthesis of Nanomaterials and Nanocomposites

Yadav¹,

Yadav²,

Singh³

2012

532

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Synthesis of nanomaterials by a simple, low cost and in high yield has been a great challenge since the very early development of nanoscience. Various bottom and top down approaches have been developed so far, for the commercial production of nanomaterials. Among all top down approaches, high energy ball milling, has been widely exploited for the synthesis of various nanomaterials, nanograins, nanoalloy, nanocomposites and nano -quasicrystalline materials. Mechanical alloying techniques have been utilized to produce amorphous and nanocrystalline alloys as well as metal/non-metal nanocomposite materials by milling and post annealing, of elemental or compound powders in an inert atmosphere. Mechanical alloying is a non-equilibrium processing technique in which different elemental powders are milled in an inert atmosphere to create one mixed powder with the same composition as the constituents. In high-energy ball milling, plastic deformation, cold-welding and fracture are predominant factors, in which the deformation leads to a change in particle shape, cold-welding leads to an increase in particle size and fracture leads to decrease in particle size resulting in the formation of fine dispersed alloying particles in the grain-refined soft matrix. By utilizing mechanical milling various kind of aluminium/ nickel/ magnesium/ copper based nanoalloys, wear resistant spray coatings, oxide and carbide strengthened aluminium alloys, and many other nanocomposites have been synthesized in very high yield. The mechanical milling has been utilized for the synthesis of nanomaterials either by milling and post annealing or by mechanical activation and then applying some other process on these activated materials. This review is a systematic view of the basic concept of mechanical milling, historical view and applications of mechanical milling in the synthesis of various nanomaterials, nanosomposites, nnaocarbons and nano quasicrystalline materials.

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“…Also, it is possible to observe such characteristic phenomenon related with interaction of metallic dopants with the light from visible range spectrum as localized surface plasmon resonance (LSPR) [28]. Doped and undoped TiO 2 can be synthesized by several processes including: sol-gel [36][37][38]; hydrothermal [7,30,39,40]; spray or laser pyrolysis [41,42]; mechanical alloying [43,44]; and chemical vapour deposition (CVD) [45,46]. In this article, the authors have focused on the optical parameters of TiO 2 nanopowders, undoped and doped with silver and copper during synthesis, or by the pulsed magnetron sputtering method that is one of the physical vapour deposition (PVD) technique [47].…”

Section: Introductionmentioning

confidence: 99%

Optical Properties of TiO₂Nanopowder Doped by Silver (Copper) during Synthesis or PVD Method

2016

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Titanium dioxide doped nanopowders were prepared in two ways: (i) by applying a sol-gel method and (ii) by applying the sol-gel synthesis as the first step for pure TiO2 preparation, and next, doped by using magnetron sputtering technique, that is one of a physical vapour deposition method. Silver and copper (Ag, Cu) metals were used as the dopants. Prepared samples were investigated by scanning electron microscope, X-ray diffraction and UV-Vis spectroscopy. The effect of the dopants' nature and the applied doping method were studied. The results showed that each prepared particles are nanocrystalline materials with particles diameter range from 80 nm to 500 nm (depending on the doping method). From optical experiments, it was possible to observe changes in absorbance spectra, which are probably related to interfacial charge transfer and the localized surface plasmon resonance phenomenon.

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The photocatalytic activity of 2.5wt% Cu-doped TiO2 nano powders synthesized by mechanical alloying

Cited by 80 publications

References 14 publications

Preparation of Cu-Doped TiO2 Photocatalyst with Thermal Plasma Torch for Low-Concentration Mercury Removal

Preparation of Cu-Doped TiO2 Photocatalyst with Thermal Plasma Torch for Low-Concentration Mercury Removal

Mechanical Milling: a Top Down Approach for the Synthesis of Nanomaterials and Nanocomposites

Optical Properties of TiO₂Nanopowder Doped by Silver (Copper) during Synthesis or PVD Method

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The photocatalytic activity of 2.5wt% Cu-doped TiO2 nano powders synthesized by mechanical alloying

Cited by 80 publications

References 14 publications

Preparation of Cu-Doped TiO2 Photocatalyst with Thermal Plasma Torch for Low-Concentration Mercury Removal

Preparation of Cu-Doped TiO2 Photocatalyst with Thermal Plasma Torch for Low-Concentration Mercury Removal

Mechanical Milling: a Top Down Approach for the Synthesis of Nanomaterials and Nanocomposites

Optical Properties of TiO2Nanopowder Doped by Silver (Copper) during Synthesis or PVD Method

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Optical Properties of TiO₂Nanopowder Doped by Silver (Copper) during Synthesis or PVD Method