State Water Resources Research Institute Program


Project ID: 2009ND184B
Title: Polymer Modified Zero-valent Iron Nanoparticles for Arsenic Remediation: Longevity and Ionic
Project Type: Research
Start Date: 3/01/2009
End Date: 2/28/2010
Congressional District: 1
Focus Categories: Methods, Water Quality, Groundwater
Keywords: Arsenic remediation, Iron nanoparticles, Graft Co-polymer
Principal Investigator: Bezbaruah, Achintya Nayan (North Dakota State University); Chisholm, Bret
Federal Funds: $ 10,000
Non-Federal Matching Funds: $ 20,000
Abstract: Various chlorinated aliphatic hydrocarbons and toxic metals can be remediated using metal nanoparticles such as zero-valent iron nanoparticles (nZVI). Metal particles/nanoparticles have also been used for the remediation of groundwater contaminated with chemicals used in explosives and arsenic. The effectiveness of nZVI for groundwater remediation depends upon the effective delivery of the nanoparticles to the water/contaminate interface without flocculation and severe oxidation. To accomplish effective delivery of nZVI, a delivery system that provides for dispersability and colloidal stability of individual nanoparticles in water is required. In addition, the delivery system should protect the nZVI from severe oxidation by dissolved oxygen and water and provide an affinity for the water/contaminate interface. Maximum efficiency of the remediation approach will only be realized if the metal nanoparticles effectively migrate to the contaminant or the water/contaminant interface. The objective of this study is to modify the iron nanoparticle surfaces using amphiphilic polysiloxane graft copolymers (APGCs) for effective groundwater remediation. The tasks to be investigated in this study are: 1) Effect of contaminant concentration on reaction kinetics for modified nZVI mediated degradation of As, TCE, and RDX 2) longevity (shelf-life) of modified nZVI 3) Effect of ionic strength on colloidal stability and contaminant degradation by CnZVI and 4) Corrosion characteristics of bare nZVI and CnZVI by FTIR. The study has the potential to develop a new polymeric delivery vehicle for iron nanoparticles for groundwater Aresnic, TCE, and RDX remediation. The synthesis, characterization, and analysis phases of the polymeric delivery vehicle development process will result in fundamental knowledge on the behavior of the polymer coated nanoparticles.

Progress/Completion Report, 2009, PDF

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