35922-41-9Relevant academic research and scientific papers
Zirconium and silver co-doped TiO2 nanoparticles as visible light catalyst for reduction of 4-nitrophenol, degradation of methyl orange and methylene blue
Naraginti, Saraschandra,Stephen, Finian Bernard,Radhakrishnan, Adhithya,Sivakumar
, p. 814 - 819 (2015)
Catalytic activity of Zr and Ag co-doped TiO2 nanoparticles on the reduction of 4-nitrophenol, degradation of methylene blue and methyl orange was studied using sodium borohydride as reducing agent. The nanoparticles were characterized using X-ray diffraction, energy dispersive X-ray, high resolution transmission electron microscopy, selected area electron diffraction and UV-Vis spectroscopy. The rate of the reduction/degradation was found to increase with increasing amount of the photocatalyst which could be attributed to higher dispersity and small size of the nanoparticles. The catalytic activity of Zr and Ag co-doped TiO2 nanoparticles showed no significant difference even after recycling the catalyst four times indicating a promising potential for industrial application of the prepared photocatalyst.
Photophysical and photochemical characterisation of bacterial semiconductor cadmium sulfide particles
Smith, Peter R.,Holmes, Justin D.,Richardson, David J.,Russell, David A.,Sodeau, John R.
, p. 1235 - 1241 (1998)
Klebsiella pneumoniae forms electron-dense cadmium sulfide particles (ca. 5-200 nm in diameter) on the cell surface in response to the presence of cadmium ions in the growth medium. In the current study, these 'bio-semiconductor' particles have been spectroscopically characterised using UV-VIS absorption and luminescence analysis. The spectroscopic properties observed suggest that they are similar in size and possess photoactive traits analogous to CdS systems prepared by conventional chemical methods. The optical nature of the bacterial semiconductor particles means that, in principle, they are capable of performing a variety of photoredox reactions. The reactions involving photoelectrochemical indicators such as methyl viologen (MV2+) and methyl orange (MO-) are considered and, by comparing initial rates of reaction and altering reaction variables, a general mechanism of photoactivity for the cadmium sulfide 'bio-semiconductor' is proposed.
Methyl Orange as a Probe of the Semiconductor-Electrolyte Interfaces in CdS Suspension
Mills, Andrew,Williams, Geraint
, p. 2647 - 2662 (1987)
Cadmium sulphide (CdS) powder dispersions have been used to sensitise the photoreduction of methyl orange (D-) at pH+) 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.
