Reaction of EDTA and related aminocarboxylate chelating agents with CoIIIOOH (heterogenite) and MnIIIOOH (manganite)

Article Abstract:

Aminocarboxylate chelating compounds, including EDTA, HEEDTA, NTA and IDA, have been found to yield reductive dissolution by-products when allowed to react with manganite. The introduction of heterogenite to certain compounds, particularly EDTA and NTA, on the other hand, tend to induce the formation of both ligand-assisted dissolution and reductive dissolution products. Results further confirmed the ability of EDTA, NTA and IDA to dissolve mineral surface bound cobalt.

Primary nonferrous metals, not elsewhere classified, Primary Smelting and Refining of Nonferrous Metal (except Copper and Aluminum), All Other Miscellaneous Chemical Product and Preparation Manufacturing, Chelating Agents, Chemical preparations, not elsewhere classified, Manganese, Cobalt, Analysis, Manganese (Metal), EDTA, Chemical reactions, Ethylenediaminetetraacetic acid

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Surface-catalyzed chromium(VI) reduction: the TiO2-CrVI-mandelic acid system

Article Abstract:

The kinetics and mechanism behind CrVI reduction by mandelic acid oxidation were investigated. It is shown that the redox reaction is catalyzed by the oxide surface. The primary products of mandelic acid oxidation are benzoylformic acid and benzaldehyde. The results suggest that CRVI adsorption is necessary for the whole reaction to occur and that the adsorption of the organic reductant is not required.

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Surface-catalyzed chromium(VI) reduction: reactivity comparisons of different organic reductants and different oxide surfaces

Article Abstract:

The ability of different organic compounds to catalyze chromium(VI) reduction reactions was investigated in the presence and absence of oxide surfaces. The results showed that surface-catalyzed Cr(VI) reduction by titanium dioxide has the highest efficiency. Likewise, geothite also displayed quite high catalytic reactivity, but less than that of titanium dioxide.

Oxides

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