Project 7: Chloro-Organic Degradation by Nanosized Metallic Systems and by Chelat

项目 7：纳米金属系统和 Chelat 降解氯有机物

• 批准号: 8249964
• 负责人: Dibakar Bhattacharyya
• 金额: $ 24.23万
• 依托单位: UNIVERSITY OF KENTUCKY
• 依托单位国家: 美国
• 资助国家: 美国
• 起止时间: 至
• 项目状态: 未结题
• 来源: https://reporter.nih.gov/project-details/8249964
• 关键词: Advanced Development; Anions; Carbon; Characteristics; Chelating Agents; Chemicals; Chlorine; Development; Educational workshop; Effectiveness; Environment; Enzymes; Equilibrium; Flushing; Foundations; Free Radicals; Future; Generations; Glucose; Health Benefit; Hydrogen; Hydrogen Peroxide; Hydroxyl Radical; Immobilization; In Situ; Iron; Iron Chelating Agents; Kinetics; Lead; Life; Maps; Membrane; Metals; Methods; Modeling; Monitor; Morphology; Nanostructures; Nanotechnology; Nanotubes; National Institute of Environmental Health Sciences; Natural regeneration; Parents; Pathway interactions; Phase; Phenols; Pollution; Polychlorinated Biphenyls; Polymers; Production; Property; Reaction; Reagent; Research; Roentgen Rays; Role; Salts; Sampling; Site; Soil; Solvents; Spectrum Analysis; Structure; Superoxides; Surface; System; Techniques; Technology; Testing; Toxic effect; Trichloroethylene; Vascular Endothelial Cell; Vinyl Chloride; Water; Work; base; biodegradable product; catalyst; cost effective; dechlorination; diphenyl; enzyme immobilization; flexibility; gluconate; glucose oxidase; improved; innovation; membrane assembly; nanoparticle; nanosized; nanostructured; novel strategies; nutrition; operation; organic acid; oxidation; particle; pollutant; reaction rate; remediation; superfund chemical; superfund site; surfactant; technology development

Chlorinated organics bring toxicity from water, soil, and sediment phases, and exert a cumulative, deleterious effect on the environment. Various Superfund sites contain mixtures of RGBs, chloroethylenes, and other compounds. The degradation of of chloro-organics to nontoxic, non-chlorinated, and easily biodegradable products will require integrated approaches involving "combined" (reductive and oxidative) remediation technologies. Our proposed approach to use combined technologies should lead to significant improvement over current remediation practices by the elimination of the production of chloro-organic intermediates. Our research will focus on the degradation of selected RGBs, TCE, and RGB mixtures. A thorough understanding of the reaction kinetics for both steps (reductive and oxidative), the potential role of surfactants, and material (such as doping catalyst metals, chelates) characteristics will be important for the integration of the steps. The approaches taken for reductive dechlorination by bimetallic nanoparticles in polymer media and nanotubes will allow the development of highly controlled structures for high reactivity and stability. The proposed technology will have a significant impact on the role of nanostructured materials and hydroxyl radical /superoxide radical anion reaction pathway in the environmental field for current and future needs. The technique for potential on-site generation of hydrogen peroxide and gluconic acid (iron chelate) provides enzyme (glucose oxidase) immobilization using an innovative approach of layer- by-layer assembled membranes, and this should enhance application opportunities in various Superfund sites. Kinetic modeling of both oxidative and reductive systems should establish an excellent foundation for fundamental understanding of bimetallic nanotechnology-based systems and for chelate-modified hydroxyl/superoxide radical-based reactions. Another important aspect of this proposal is that pollutant toxicity will be reduced significantly for both the dechlorination step and the combined reaction systems. Relevance: The proposed research is expected to have significant positive impact on pollution remediation through flexible dechlorination technology developments with significant reduction of material usage, and highly improved health benefits through toxicity reduction.

氯化有机物从水、土壤和沉积物阶段带来毒性，并施加累积，