Study of Pd(II) adsorption over titanate nanotubes of different diameters

Kochkar, Hafedh; Turki, Asma; Bergaoui, Latifa; Berhault, Gilles; Ghorbel, Abdelhamid

doi:10.1016/j.jcis.2008.11.002

Cited by 50 publications

(14 citation statements)

References 24 publications

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“…4 that doping transition metals into titanium dioxide nanotubes tune the optical band gap in comparison to undoped TNTs, thus shifting UV absorption to visiblelight absorption and band gap narrowing. The band gap is reduced with doping of TNTs with Fe and Cr (Quan et al, 2005;Xu et al, 2005a;Kochkar et al, 2009) which was determined by K-Munk function. The narrower band gap, the more easily an electron is excited from the valence band to the conduction band.…”

Section: The Drs Studiesmentioning

confidence: 99%

“…The decrease in band gap energy of BTNTs can be ascribed to Fe/ Cr atom incorporated into the lattice of titanium dioxide. Thus, it induces a larger red-shift and bandgap narrowing thus changing the crystalline and electronic structures (Xu et al, 2005a;Kochkar et al, 2009).…”

Section: The Drs Studiesmentioning

confidence: 99%

“…Interest in TiO 2 nanotubes photocatalysis increased after the pioneering study of Fujishma and Honda in 1972. Kochkar et al (2009) discovered the photocatalytic splitting of water on TiO 2 electrodes. Furthermore, Coating the nanotubes with transition metals resulted in boosting of their activity (Dmitry et al, 2005;Kochkar et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

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Iron and chromium doped titanium dioxide nanotubes for the degradation of environmental and industrial pollutants

Hussain

Siddiqa

2011

Int. J. Environ. Sci. Technol.

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Pure titanate nanotubes and titanate nanotubes doped with iron (III) and chromium (III) were fabricated by the hydrothermal treatment in methanol and sodium hydroxide mixture. The fabricated nano tubes have high surface area, high aspect ratio, consisted of very good surface morphology and high metals dispersion. The morphology, crysralline phase, composition were characterized by powdered X-ray diffraction, scanning electron microscopy, transmission electron microscopy, Barrett-Joyner-Halenda methods and X-ray photoelectron spectroscopy. The results showed that nanotubes possess anatase phase and are composed up of 8-12 nm in diameter and 360-400 nm in length. The band gap of the titanium dioxide nanotubes was determined using transformed diffuse reflectance spectroscopy according to the Kubelka-Munk theory, showed pronounced band gap decrease on doped titanium dioxide nanotubes. The photocatalytic activity of doped nanotubes were evaluated in terms of degradation of phenol and photoreduction of carbon dioxide into methanol and ethanol under Ultra violet and Infra red irradiation. It was found that with iron (III) and chromium (III) doped titanium dioxide nanotubes exhibited much higher photocatalytic activity than undoped titanate nanotubes.

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Section: The Drs Studiesmentioning

confidence: 99%

Section: The Drs Studiesmentioning

confidence: 99%

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Iron and chromium doped titanium dioxide nanotubes for the degradation of environmental and industrial pollutants

Hussain

Siddiqa

2011

Int. J. Environ. Sci. Technol.

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“…In the past few years, various investigations have been conducted to study the adsorption potential of TNTs towards the removal of gas [13], organic dyes [14][15][16][17], Ag(I) [18], Pb(II) [18][19][20], Cu(II) [18,21] and As(V) [22]. It was first reported by Umek et al [13] that gaseous NO 2 could be physically adsorbed on the surface of TNTs by p y orbital of the oxygen atoms.…”

Section: Introductionmentioning

confidence: 99%

Influence of solution chemistry on the removal of Ni(II) from aqueous solution to titanate nanotubes

Sheng

Yang

Sheng

et al. 2011

Chemical Engineering Journal

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“…A favorable candidate for obtaining high surface area Ru catalysts on TiO 2 -based support is provided by hydrogenotitanate solids. These supports offer the advantages of high surface areas, high adsorptive properties and ease of preparation since they can be obtained through hydrothermal treatment of TiO 2 under concentrated alkaline solutions [9][10][11][12][13]. The objective of the present study is therefore to evaluate the importance of using high surface area TiO 2 -based Ru catalysts for the CWAO of p-HBZ.…”

Section: Introductionmentioning

confidence: 99%

Highly active ruthenium catalysts supported on nanostructured titanates for application in catalytic wet air oxidation of p-hydroxybenzoic acid

Triki

Kochkar

Berhault

et al. 2010

Reac Kinet Mech Cat

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Ruthenium catalysts have been prepared by incipient wetness impregnation of ruthenium(III) nitrosylnitrate, Ru(NO)(NO 3 ) 3 onto high surface area titanate supports obtained by hydrothermal treatment of TiO 2 P25 in concentrated alkaline solutions. These Ru-containing catalysts were evaluated in the catalytic wet air oxidation of p-hydroxybenzoic acid (p-HBZ), a model compound representative of phenolic pollutants present in olive mills wastewaters, at 413 K and 50 bars of air. Two different titanates morphologies were tested as supports for this reaction: hydrogenotitanate nanotubes (HNT) obtained with concentrated NaOH and hydrogenotitanate nanowires (HNW) formed in the presence of highly concentrated KOH solution. The HNT and HNW supports and their corresponding supported Ru catalysts were characterized by means of N 2 adsorption-desorption, XRD, UV and TEM analyses. Results showed that the use of high surface area titanate supports led to catalysts much more active than similar Ru catalysts supported on conventional TiO 2 supports.

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Study of Pd(II) adsorption over titanate nanotubes of different diameters

Cited by 50 publications

References 24 publications

Iron and chromium doped titanium dioxide nanotubes for the degradation of environmental and industrial pollutants

Iron and chromium doped titanium dioxide nanotubes for the degradation of environmental and industrial pollutants

Influence of solution chemistry on the removal of Ni(II) from aqueous solution to titanate nanotubes

Highly active ruthenium catalysts supported on nanostructured titanates for application in catalytic wet air oxidation of p-hydroxybenzoic acid

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