Electrokinetic behavior of spherical colloidal particles of cadmium sulfide

Guindo, M.C.; Zurita, L.; Durán, J.D.G.; Delgado, A.V.

doi:10.1016/0254-0584(95)01662-e

Cited by 15 publications

(12 citation statements)

References 13 publications

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“…Liu and Huang 60 subsequently reported a pH zpc for cubic CdS of 7.0 and pH zpc ¼ 7.5 for hexagonal CdS. In contrast, other researchers [61][62][63] have reported substantially lower values for the pH zpc for CdS in aqueous suspensions. Under experimental conditions that were quite different from those employed by Park and Huang, 59 Nicolau and Menard 63 determined a pH zpc ¼ 1.8 for 0.01 M Na 2 SO 4 and KCl as background electrolytes based on electrophoretic mobility measurements.…”

Section: (A)) Icp-ms Resultsmentioning

confidence: 96%

“…Although, the externally mixed sample (Fig. 6(b) 62 found even lower values of pH zpc between 1 and 1.5 for differently prepared spherical CdS particles. However, they pointed out that the IEP (isoelectric point) was sensitive to the specific surface characteristics of CdS which depend on the degree of oxidation or aging as noted by the shift in IEP to higher values for samples that were synthesized over longer periods of time.…”

Section: Photocatalytic H 2 Productionmentioning

confidence: 85%

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Photocatalytic production of hydrogen on Ni/NiO/KNbO3/CdS nanocomposites using visible light

et al. 2008

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3. Enhanced activity is most likely due to effective charge separation of photogenerated electrons and holes in CdS that is achieved by electron injection into the conduction band of KNbO 3 and the reduced states of niobium (e.g., Nb(IV) and Nb(III)) are shown to contribute to enhanced reactivity in the KNbO 3 composites by mediating effective electron transfer to bound protons. We also observed that the efficient attachment of Q-size CdS and the deposition of nickel on the KNbO 3 surface increases H 2 production rates. Other factors that influence the rate of H 2 production including the nature of the electron donors and the solution pH were also determined. The Ni/NiO/KNbO 3 /CdS nanocomposite system appears to be a promising candidate for possible practical applications including the production of H 2 under visible light.

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Section: (A)) Icp-ms Resultsmentioning

confidence: 96%

Section: Photocatalytic H 2 Productionmentioning

confidence: 85%

Photocatalytic production of hydrogen on Ni/NiO/KNbO3/CdS nanocomposites using visible light

et al. 2008

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“…Therefore, the CdS-based photocatalytic system can be applied to producing hydrogen from water containing electron donors (e.g., wastewaters). The photocatalytic efficiency of CdS is substantially influenced by various factors such as crystallinity, 9 surface area, 10 surface etching, 11,14,15 pH and related properties (e.g., flat band potential, surface charge), [16][17][18][19][20] ED and solvent (e.g., alcohols, sulfide, sulfite), 10,18,21,22 cocatalyst (e.g., Pt, Ni), 10,14,15,[20][21][22][23][24][25][26][27] support materials (e.g., Al 2 O 3 , TiO 2 , ZnO, ZnS, zeolite, KNbO 3 ), 22,[28][29][30][31] etc. For hydrogen production, CdS particles are usually platinized either by physical mixing with Pt particles (e.g., Pt black, Pt sol) or by photoplatinization.…”

Section: Introductionmentioning

confidence: 99%

Effects of the preparation method of the ternary CdS/TiO2/Pt hybrid photocatalysts on visible light-induced hydrogen production

2008

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A variety of combinations of CdS, TiO 2 , and Pt in preparing the hybrid catalysts were studied for hydrogen production under visible light (l > 420 nm) irradiation. The preparation method sensitively influenced the activity of the ternary hybrid catalysts. The formation of the potential gradient at the interface between CdS and TiO 2 is necessary in achieving the efficient charge separation and transfer and how the platinum as a cocatalyst is loaded onto the CdS/TiO 2 hybrid catalysts determines the overall hydrogen production efficiency. The common method of photoplatinization of CdS/TiO 2 hybrid [Pt-(CdS/TiO 2 )] was much less efficient than the present method in which Pt was photodeposited on bare TiO 2 , which was followed by the deposition of CdS [CdS/(Pt-TiO 2 )]. The CdS/(Pt-TiO 2 ) has the hydrogen production rate ranging (6-9) Â 10, which is higher by a factor of 3-30 than that of Pt-(CdS/TiO 2 ). The photocatalytic activity of the ternary hybrid catalysts was extremely sensitive to where the platinum is loaded. The photoactivity of the hybrid catalyst was also assessed in terms of the photocurrent collected by the methyl viologen electron shuttle in the catalyst suspension. CdS/(Pt-TiO 2 ) generated higher photocurrents than Pt-(CdS/TiO 2 ) by a factor of 2-7. The extreme sensitivity of the preparation method to the hydrogen production activity should be taken into account when hybrid photocatalysts are designed and prepared.

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“…Above this pH, f-potential is annulled with pH by specific adsorption of Cd 2+ or CdOH + and the second pH 0 may be found in the pH 7 -10 range, depending on the ionic species in the solution [33,34]. However, the colloidal CdS particles we prepared did not exhibit the second pH 0 because the treatment with MPS sufficiently makes the particles anionic over the wide pH range.…”

Section: Assemblies Of the Cds Particulate Filmsmentioning

confidence: 74%

Particulate assemblies of CdS and TiO2 prepared by Langmuir–Blodgett technique with octadecylamine/methylstearate mixed films

et al. 2005

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Electrokinetic behavior of spherical colloidal particles of cadmium sulfide

Cited by 15 publications

References 13 publications

Photocatalytic production of hydrogen on Ni/NiO/KNbO3/CdS nanocomposites using visible light

Photocatalytic production of hydrogen on Ni/NiO/KNbO3/CdS nanocomposites using visible light

Effects of the preparation method of the ternary CdS/TiO2/Pt hybrid photocatalysts on visible light-induced hydrogen production

Particulate assemblies of CdS and TiO2 prepared by Langmuir–Blodgett technique with octadecylamine/methylstearate mixed films

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