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Journal ArticleDOI

Cadmium sulfide with iridium sulfide and platinum sulfide deposits as a photocatalyst for the decomposition of aqueous sulfide

TL;DR: In this article, the in situ deposition of Pt and Ir on CdS during the photocatalytic decomposition of aqueous sulfide results in the formation of an effective bifunctional photocatalyst (MS/CdS/M), where MS is Pt or Ir sulfide and M is P or Ir.
Abstract: The in situ deposition of Pt and Ir on CdS during the photocatalytic decomposition of aqueous sulfide results in the formation of an effective bifunctional photocatalyst (MS/CdS/M, where MS is Pt or Ir sulfide and M is Pt or Ir) which is more active than CdS and metallized CdS. In situ metallization provides a convenient method for the preparation of metal- and metal-sulfide-deposited CdS. The order of reactivity for the in situ metallization of CdS in the case of the photocatalytic decomposition of aqueous sulfide is Rh > Pt > Ru = Ir > Co ≃ Ni ≃ Fe. Based on the observed results a mechanism for the photocatalytic decomposition of aqueous sulfide is proposed.
Citations
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Patent
31 Jul 1997
TL;DR: In this paper, a method for reacting a molecule using light as an energy source is described which comprises exposing the molecule to a catalyst material, the catalyst material in contact with an illuminated, quantum confined silicon domain.
Abstract: A method for reacting a molecule using light as an energy source is described which comprises exposing the molecule to a catalyst material, the catalyst material in contact with an illuminated, quantum confined silicon domain. The silicon domain having a band gap greater than bulk silicon and sufficiently large for reacting the molecule. The method is particularly useful in decomposing water into hydrogen and oxygen, as well as photocatalytically degrading pollutants in a waste stream.

31 citations

Journal ArticleDOI
TL;DR: In this paper, a spinel metal oxide photocatalyst, ZnBiGa0 4, was reported for the photocatalytic decomposition of hydrogen sulfide (H 2 S) to generate hydrogen.
Abstract: In this paper, we are reporting a novel spinel metal oxide photocatalyst, ZnBiGa0 4 for the photocatalytic decomposition of hydrogen sulfide (H 2 S) to generate hydrogen. ZnBiGaO 4 was prepared by two different methods. One is usual solid-state route and another is hydrothermal route, and this is the first time we are reporting ZnBiGa0 4 synthesized by this route. The newly prepared ZnBiGa0 4 was characterized for its crystal structure and microstructure by using XRD and Field Emission Scanning Electron Microscopy (FESEM), respectively. XRD analysis revealed that the structure of ZnBiGa0 4 is cubic spinel structure. The photocatalyst was also characterized by using UV-Visible diffuse reflectance spectroscopy to determine its band gap and was estimated to be 2.8 eV. Our prima facie observations revealed that the formation of single-phase cubic spinel ZnBiGa0 4 with significant photocatalytic activity under visible-light irradiations for solar hydrogen generation from H 2 S.

29 citations

Journal ArticleDOI
R. Priya1, S. Kanmani1
TL;DR: Pilot-scale solar photocatalytic reactor was designed for treating 1 m3 of sulphide wastewater and also for the simultaneous generation of hydrogen, which would be suitable for India like sub-tropical country where sunlight is abundantly available throughout the year.
Abstract: Experiments were conducted for photocatalytic generation of renewable fuel hydrogen from sulphide wastewater from the sewage treatment plant. In this study, pilot-scale solar photocatalytic reactor was designed for treating 1 m3 of sulphide wastewater and also for the simultaneous generation of hydrogen. Bench-scale studies were conducted both in the batch recycle and continuous modes under solar irradiation at similar experimental conditions. The maximum of 89.7% conversion was achieved in the continuous mode. The length of the pilot-scale solar photocatalytic reactor was arrived using the design parameters such as volumetric flow rate (Q) (11×10−2 m3/s), inlet concentration of sulphide ion (Cin) (28 mol/m3), conversion (89.7%) and average mass flow destruction rate® (3.488×10−6 mol/m2 s). The treatment cost of the process was estimated to be 6 US$/m3. This process would be suitable for India like sub-tropical country where sunlight is abundantly available throughout the year.

29 citations


Cites background from "Cadmium sulfide with iridium sulfid..."

  • ...reaction mixture, which reacts with yellow disulphide ions to give colourless thiosulphate ion.[20] In the batch recycle mode of operation, maximum of 176 mL of H2 generated in 90 min at an average solar light intensity of 520 W/m2....

    [...]

Journal ArticleDOI
TL;DR: In this paper, a modified MSS method has been proposed for uniform particle size, well-defined crystal structure, controlled morphology and stoichiometry vis-a-vis photocatalysis.

29 citations

Journal ArticleDOI
TL;DR: In this article, the authors investigated the liquid phase hydroxylation of benzene to phenol with hydrogen peroxide over Fe/TiO2-based catalysts and found that the presence of the second metal can improve the phenol production.

26 citations

References
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Journal ArticleDOI
TL;DR: In this paper, the principles and applications of semiconductor electrodes in photo-electrochemical (PEC) cells (liquid junction photovoltaic, photoelectro-synthetic, photocatalytic) are described.

886 citations

Journal ArticleDOI
TL;DR: The primary effect in the hydrodesulfurization of dibenzothiophene by transition metal sulfides is related to the position the metal occupies in the periodic table.

722 citations

Book
01 Jan 1983
TL;DR: Energy resources through photochemistry and catalysis as discussed by the authors have also been used for energy and mineral resources in the field of computer science. But, they have not been used in the area of renewable energy.
Abstract: energy resources through photochemistry and catalysis pdf ebook energy resources through photochemistry and catalysis ebook energy resources through photochemistry and catalysis energy resources through photochemistry and catalysis energy resources through photochemistry and catalysis energy resources through photochemistry and catalysis organometallics and catalysis pdf firebase light harvesting and energy transfer in laser dye-labeled nanotechnology in catalysis nanostructure science and free download section 4 1 energy and mineral resources kids guide to types of landforms childrens science nature photochemistry and photophysics of hyper porphyrins solar photochemistry office of science 2000 gmc w3500 manual quafe free download section 4 2 alternate energy resources homogeneous and heterogeneous photocatalysis springer free download energy and resources section 1 reinforcement malory and christianity essays on sir thomas malorys morte nazaryth [the exiled 1] (siren publishing everlasting free download energy resources wordsearch answers cad managers guidebook paycox photoelectrochemical reduction of co2 using silicate rock tier unit 3 1 day fourscorched earth ebook | ufcgymmatthews how to troubleshoot a tv receiver dioro bien dit french 2 workbook answers alongz size effects in photoprocesses on dispersed catalysts department of chemistry, university of texas, austin basic energy sciences overview

671 citations

Journal ArticleDOI
TL;DR: In this article, photoetching of CdS microcrystals has been used to improve the efficiency of photochemical hydrogen production by irradiating suspensions of platinized cdS in various electrolyte solutions.
Abstract: Active photocatalysts for photochemical hydrogen production have been prepared by platinum deposition on microcrystals of CdS powders. Hydrogen produced by irradiating suspensions of platinized CdS in various electrolyte solutions (S/sup 2 -/, SO/sub 3//sup 2 -/, H/sub 2/PO/sup 2 -/) has been shown to be significantly improved by photoetching the CdS microcrystals. The efficiency of hydrogen formation in solutions containing S/sup 2 -/ is low due to the formation of disulfide ions. Additional of reducing agents such as sulfite or hypophosphite ions, which efficiently suppresses disulfide formation, allows hydrogen to evolve at a surprisingly high rate. In the case of a solution containing both S/sup 2/ and SO/sub 3//sup 2 -/ ions, the formation of thiosulfate is observed with a quantum yield of 0.25. In mixtures of sulfide and hypophosphite ions, phosphite and phosphate ions are the oxidation products. Hydrogen formation occurs in solutions containing SO/sub 3//sup 2 -/ ions only when the platinized CdS particles have previously been photoetched. Concomitant to the proton reduction, SO/sub 3//sup 2 -/ ions are oxidized to sulfate and dithionate. In 12 days, 9 L of H/sub 2/ was generated by irradiating 1 g of CdS/Pt suspended in an Na/sub 2/SO/sub 3/ solution. Aftermore » this period, the efficiency of the photocatalyst dropped to about 60% of the initial rate. The reaction parameters and the formation of the oxidation products have been investigated in detail. 57 references, 10 figures, 4 tables.« less

371 citations

Journal ArticleDOI
01 Jan 1981-Nature
TL;DR: In this article, a bifunctional redox catalyst composed of RuO2 and Pt co-supported on colloidal TiO2 particles is used for water decomposition by visible light illumination.
Abstract: A bifunctional redox catalyst, composed of Pt and RuO2 co-deposited on a colloidal TiO2 carrier, is a highly potent mediator for water decomposition by visible light1. The system contains apart from the sensitizer (Ru(bipy)2+3) an electron relay—methylviologen. The latter is reduced on light excitation, and the photoreaction is coupled with catalytic steps2 generating H2 and O2 from water. To rationalize the surprisingly high efficiency of this photoredox system, we proposed a mechanism involving species adsorbed at the TiO2 surface. This led us to explore sensitizers which through suitable functionalization show an enhanced affinity for adsorption at the particle–water interface. We describe here the performance of electron relay-free systems capable of efficiently decomposing water into H2 and O2 under visible light illumination. A bifunctional redox catalyst composed of RuO2 and Pt co-supported on colloidal TiO2 particles is used. The only other component present is a sensitizer. Amphiphilic surfactant derivatives of Ru(bipy)2+3 exhibit extremely high activity in promoting the water cleavage process. Adsorption of the sensitizer at the TiO2 particle–water interface and electron ejection into the TiO2 conduction band are evoked to explain the observations. Exposure to UV radiation leads to efficient water cleavage in the absence of sensitizer.

353 citations