Welcome to LookChem.com Sign In|Join Free

Article Doi

Methyl Orange as a Probe of the Semiconductor-Electrolyte Interfaces in CdS Suspension

DOI: 10.1039/f19878302647

Source and publish data:

Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases p. 2647 - 2662 (1987)

Update date:2022-08-11

Topics:

Authors:

Mills, AndrewMills, Andrew

Williams, GeraintWilliams, Geraint

Read Full Text PDF DownLoad Join now for total 90,000,000 free articles

Article abstract of DOI:10.1039/f19878302647

Cadmium sulphide (CdS) powder dispersions have been used to sensitise the photoreduction of methyl orange (D-) at pH<7 in aqueous solution.A number of electron donors were added (PVA, TEOA, nitrate, tartrate, cysteine, citrate, acetate and EDTA), but at pH 4.4 only EDTA enchanced appreciably the rate of methyl orange photoreduction.A steady-state equation was developed which successfully described the observed variation in initial rate of methyl orange photoreduction as a function of the concentrations of methyl orange, photons, EDTA and O2 (when present).From this work it was shown that the rate constant for hole (h+) scavenging by EDTA was ca. 19000 times greater than that for the recombination reaction between h+ and a conductance band electron (e-).In addition, the rate constant for the reduction of O2 by a conductance band electron was ca. 40-50 times smaller than that for the reduction of methyl orange by e-.Corrosion studies indicated that photoreduction of methyl orange to a hydrazine derivative (3- sensitized by CdS, was accompanied by anodic corrosion of the semiconductor even in the pesence of EDTA.In this work the role of EDTA (at pH 4.4) appeared to be as a mediator of the reaction and not as an "ideal" sacrificial electron donor.Reasons for this are discussed.

View More

Products guided by the article

Product name:p'-Dimethylamino-hydrazobenzol-p-sulfonat-anion

Cas No:35922-41-9

35922-41-9

R&D Labs maybe for 35922-41-9

Relevant to this article

Hot Product