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Transformations of Co(III) and Cr(III) Complexes in Heterogeneous Media

EPA Grant Number: U915777
Title: Transformations of Co(III) and Cr(III) Complexes in Heterogeneous Media
Investigators: Carbonaro, Richard F.
Institution: Johns Hopkins University
EPA Project Officer: Thompson, Delores
Project Period: August 1, 2000 through August 1, 2003
Project Amount: $102,000
RFA: STAR Graduate Fellowships (2000)
Research Category: Academic Fellowships , Fellowship - Civil Engineering , Engineering and Environmental Chemistry

Description:

Objective:

The objective of this research project is to experimentally investigate: (1) the effect of chelating ligands on the adsorption of cobalt(III) and chromium(III) onto transition metal (iron, titanium) oxides; and (2) the effect of chelating ligands on the oxidation of chromium(III) to the hexavalent state by manganese oxides.

Approach:

Complexes of cobalt(III) and chromium(III) with (amino)carboxylate chelating agents will be synthesized according to methods reported in the literature. Methods for the analysis of these complexes will be developed using capillary electrophoresis (CE). The adsorption of the cobalt(III) and chromium(III) complexes will be studied on transition metal oxides. The mechanism for adsorption also will be investigated by slightly altering the structure of the metal complex.

Expected Results:

It is expected that the oxidation of chromium(III) by manganese oxide will occur at high pH as a result of its increased solubility. Also, the rates of oxidation are expected to vary greatly as a result of these ligands.

Supplemental Keywords:

cobalt(III), chromium(III), ethylenediaminetetraacetic acid, EDTA, nitrilotriacetic acid, NTA, iminodiacetic acid, IDA, oxidation, adsorption, chelating agents, transition metal oxides, manganese oxides, capillary electrophoresis. , POLLUTANTS/TOXICS, INTERNATIONAL COOPERATION, Scientific Discipline, Waste, RFA, Remediation, Chemicals, Hazardous Waste, Environmental Engineering, Environmental Chemistry, Chemistry and Materials Science, Hazardous, heavy metals, catalysts, capillary electrophoresis, Chromium, groundwater, hazardous waste management, gas sensor technology, advanced treatment technologies, hazardous waste treatment, sediment treatment, electrokinetics, cobalt, chemical contaminants

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The perspectives, information and conclusions conveyed in research project abstracts, progress reports, final reports, journal abstracts and journal publications convey the viewpoints of the principal investigator and may not represent the views and policies of ORD and EPA. Conclusions drawn by the principal investigators have not been reviewed by the Agency.

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