Dissolution photoreductive

Waite, T. D., and F. M. M. Morel (1984), "Photoreductive Dissolution of Colloidal Iron Oxide Effect of Citrate," J. Colloid Interface Sci. 102, 121-137. 

CIS-VO2 complexes with tridentate Schiff-base ligands also appear, and they sometimes have five-coordinate square-pyramidal structures with one oxo-ligand at the apex. Many of these species have reversible features in their CVs at E = ca —0.07 V versus Ag/AgCl/MeOH and can undergo a photoreduction in the solid state which can be reversed by dissolution [110]. 

Waite, T.D. and Morel, F.M.M., 1989a. Photoreductive dissolution of colloidal iron oxide effect of citrate. 3. Colloid Interface Sci., 102 121-137. 

It is now realized that copper as metal next to iron and chromium participates in photoredox cycles and its role cannot be ignored. The most important part of the cycle is photoreduction of Cu(II) to Cu(I) induced by solar light and oxidation of ligands to their environmentally benign forms. Then Cu(I) is easily re-oxidized to Cu(II), which can coordinate the next ligand molecule, and thereby the Cu photocatalytic cycles contribute to continuous environmental cleaning. Besides oxida-tion/reduction, other critical processes relevant to the copper cycles are adsorption/desorption and precipitation/dissolution... 

Waite T. D. and Morel E. M. M. (1984) Photoreductive dissolution of colloidal iron oxides in natural waters. Environ. Sci. Technol. 18, 860- 868. 

Manganese oxide (MnO J photoreduction is an important mechanism maintaining manganese in a reduced state in surface waters (Sunda et al., 1983), but reductive dissolution of MnO by H202 (Sunda and Huntsman, 1983), produced in part by phytoplankton amine oxidases, may be another pathway by which manganese is kept in a thermodynamically unfavorable reduced state. 

Since the rate of the photochemical dissolution via surface photoredox reaction depends on the surface concentration of the adsorbed oxalate and not the solution concentration, it is constant under the experimental conditions of this case study, whereas the rate of the homogeneous photoreduction of iron(III) depends on the concentration of dissolved iron(lll) trioxalato complexes. The rate of the photochemical iron(II) production is the sum of the rates of the heterogeneous and the homogeneous photoredox reaction. Since, under the... 

The reason for the dissolution of solid phase iron in the photic zone is the photochemical reduction of Fe(III), with UVB (280 - 315 mn) producing most of Fe(II), followed by UVA (315 -400 mn) and visible light (400 - 700 mn) (Rijken-berg et al. 2005). As a consequence, about 10 % of atmospheric FeT reaches the ocean as dissolved iron (Duce et al. 1991 Fig. 7.1). In surface waters of the global ocean the produced Fe " is subsequently reoxidized, yet, the photoreduction... 

Photolysis in ice has a role also for inorganic compounds. As an example, it was found that the photoreductive dissolution of iron oxide particles to form bioavailable iron (Fe(II)aq) was slow in aqueous solution (pH 3.5) but was significantly accelerated in polycrystalline ice. This occurred independently on the irradiation wavelength and on the type of oxides [hematite. 

Micrometer-sized hollow spheres with metal NPs (10-30 nm) were obtained by photoreduction of Ag in polyelectrolyte multilayers comprising Ag -PSS layers immobilized onto submicrometer-sized PS particles [138]. Hollow capsules with metal NPs can be formed either via a reduction of Ag followed by a core dissolution or by a core dissolution with a subsequent reduction of Ag. The formed spherical nanocomposites with silver NPs were stable for long time (over 3 months). The silver-based core-shell particles and hollow spheres may find interesting applications in catalysis and molecular photoprinting. The PEI-Pd ... 

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