Among the 275 substances on the 2007 CERCLA Priority List of Hazardous Substances are included all the heavy metals. Thus, the effective remediation of contaminated sites must invariably address the effective removal of heavy metals from contaminated water and aqueous leachates. The goal of this project is the development of new heavy metal removal/remediation/recovery technologies based on electrochemical techniques. Work has included the use of spouted particulate electrodes with circulating conductive particles for electrowinning (i.e., direct metal reduction) of heavy metals from solution. This has been applied to the development of the Cyclic Electrowinning/Precipitation (CEP) System that combines electrowinning with precipitation/redissolution to remove heavy metals from aqueous mixtures onto solid particles in a cyclic process, producing no precipitate sludges external to the process. The spouted particulate electrode is also being used as a contacting device for electrosorption/electrodesorption (ES/ED) processes on adsorbents in an electric field (SBED). Laboratory-scale electrochemical cell results have demonstrated effective performance of ES/ED methods on the removal of As, Cr, and their mixtures at ug/L levels. The SBED approach will also be used for the enhancement of zerovalent iron (ZVI) techniques for the removal of heavy metals, both with and without applied potentials. Work on this project has also identified other heavy metal contamination, purification, and analysis problems that can be effectively addressed using novel electrochemical techniques. The project goal will be achieved by fulfilling the following Specific Aims:
Specific Aim 1 : Electrowinning.
This Aim i s focused primarily on the development of the CEP System, as noted above. This system has been constructed, is operational, and is currently in the test phase.
Specific Aim 2 : Electrosorption/Electrodesorption.
This Aim i s focused on the development of ES/ED techniques, including electrochemical cycling, to enhance the uptake of heavy metals from complex mixtures onto adsorbents, and their subsequent regeneration in the SBED system. The latter will also be used for the enhancement of zero-valent iron (ZVI) techniques for the removal of heavy metals, both with and without an applied potential. In both Aims 1 and 2, data are being obtained on the removal of heavy metals from complex synthetic mixtures, and then on mixtures derived from contaminated field samples identified in collaboration with RIDEM.
Specific Aim 3 : Electrochemical Methods for Other Heavy Metals Contamination Problems.
This Aim i s focused on the development and application of electrochemical techniques, such as c/c//c electrosorption, electrochemical potential cycling for purification of heavy metal-contaminated materials, electro-deposition of modifiers for the improvement of electrosorption/adsorption performance on adsorbent materials, and the development of electrochemical methods, such as anodic stripping voltammetry (ASV), for more rapid and facile heavy metal analyses. This work will be pursued in collaboration with R. Hurt and Project 6.
The over-arching goal of this Superfund Basic Research Program is to address health concerns, and to design novel remediation techniques, related to mixed exposures arising from contaminated lands and buildings, using Rhode Island as a model for appropriate research, educational, and training interventions. This particular project is focused on the development of more effective remediation methods, based on novel electrochemical techniques, for the removal/recovery of heavy metals from complex aqueous mixtures derived from Superfund and Brownfields sites, as well as other sources of contaminated water.
|Toral-Sánchez, E; Rangel-Mendez, J R; Hurt, Robert H et al. (2018) Novel application of magnetic nano-carbon composite as redox mediator in the reductive biodegradation of iopromide in anaerobic continuous systems. Appl Microbiol Biotechnol 102:8951-8961|
|Thompson, Marcella Remer; Schwartz Barcott, Donna (2018) The Role of the Nurse Scientist as a Knowledge Broker. J Nurs Scholarsh :|
|Spade, Daniel J; Dere, Edward; Hall, Susan J et al. (2018) All-trans retinoic acid disrupts development in ex vivo cultured fetal rat testes. I: Altered seminiferous cord maturation and testicular cell fate. Toxicol Sci :|
|Spade, Daniel J; Bai, Cathy Yue; Lambright, Christy et al. (2018) Validation of an automated counting procedure for phthalate-induced testicular multinucleated germ cells. Toxicol Lett 290:55-61|
|Sears, Clara G; Braun, Joseph M; Ryan, Patrick H et al. (2018) The association of traffic-related air and noise pollution with maternal blood pressure and hypertensive disorders of pregnancy in the HOME study cohort. Environ Int 121:574-581|
|Guelfo, Jennifer L; Adamson, David T (2018) Evaluation of a national data set for insights into sources, composition, and concentrations of per- and polyfluoroalkyl substances (PFASs) in U.S. drinking water. Environ Pollut 236:505-513|
|Guelfo, Jennifer L; Marlow, Thomas; Klein, David M et al. (2018) Evaluation and Management Strategies for Per- and Polyfluoroalkyl Substances (PFASs) in Drinking Water Aquifers: Perspectives from Impacted U.S. Northeast Communities. Environ Health Perspect 126:065001|
|Chen, Po-Yen; Zhang, Mengke; Liu, Muchun et al. (2018) Ultrastretchable Graphene-Based Molecular Barriers for Chemical Protection, Detection, and Actuation. ACS Nano 12:234-244|
|Wilson, Shelby; Dere, Edward; Klein, David et al. (2018) Localization of dimethylated histone three lysine four in the Rattus norvegicus sperm genome. Biol Reprod 99:266-268|
|Kane, Agnes B; Hurt, Robert H; Gao, Huajian (2018) The asbestos-carbon nanotube analogy: An update. Toxicol Appl Pharmacol 361:68-80|
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