Catalytic activity of CuS nanoparticles in hydrosulfide ions air oxidation

• Published in: Journal of molecular catalysis. A, Chemical Vol. 212; no. 1; pp. 259 - 265
• Main Authors: Raevskaya, A.E., Stroyuk, A.L., Kuchmii, S.Ya, Kryukov, A.I.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 02-04-2004; Elsevier
• Subjects: Catalysis; Chemistry; Colloidal state and disperse state; Copper sulfide; CuS nanoparticles; Exact sciences and technology; General and physical chemistry; Hydrogen sulfide oxidation; Photochemistry; Physical and chemical studies. Granulometry. Electrokinetic phenomena; Physical chemistry of induced reactions (with radiations, particles and ultrasonics); Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry; CuS nanoparticles; Copper sulfide; Hydrogen sulfide oxidation; Heterogeneous catalysis; Catalytic reaction; Hydrogen Sulfides; Nanoparticle; Transition metal Compounds; s: Copper sulfide; Oxidation; Air; Aqueous solution
• ISSN: 1381-1169; 1873-314X
• DOI: 10.1016/j.molcata.2003.11.010

Spectral properties of colloidal CuS nanoparticles and their catalytic activity in hydrosulfide air oxidation have been investigated. It was found that the catalytic reaction occurs via chain-radical mechanism where CuS nanoparticles act as chain initiator.
Photophysical characteristics of colloidal CuS nanoparticles synthesized in various conditions and stabilized in aqueous solutions with sodium polyphosphate (SPP) were studied. A correlation between the band gap of CuS nanoparticles and their average diameter was established.
Catalytic activity of colloidal CuS nanoparticles in sodium sulfide air oxidation in aqueous solutions at atmospheric pressure and room temperatures was established and thoroughly investigated. Kinetics of HS
− oxidation and the nature of principal products of this reaction (thiosulfate and sulfate ions) were elucidated. A scheme for the mechanism of hydrosulfide ions catalytic oxidation was proposed. Accordingly to the scheme, HS
− oxidation is a chain-radical reaction initiated on the surface of CuS nanoparticles and propagating further in the bulk of a solution.