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Award Abstract #0954130

CAREER: Fundamentals of Nanoparticle Behavior in Water Treatment

NSF Org: CBET
Div Of Chem, Bioeng, Env, & Transp Sys
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Initial Amendment Date: July 6, 2010
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Latest Amendment Date: August 30, 2013
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Award Number: 0954130
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Award Instrument: Continuing grant
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Program Manager: William Cooper
CBET Div Of Chem, Bioeng, Env, & Transp Sys
ENG Directorate For Engineering
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Start Date: July 15, 2010
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End Date: June 30, 2016 (Estimated)
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Awarded Amount to Date: $423,032.00
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Investigator(s): Sharon Walker swalker@engr.ucr.edu (Principal Investigator)
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Sponsor: University of California-Riverside
Office of Research
RIVERSIDE, CA 92521-1000 (951)827-5535
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NSF Program(s): Enviro Health & Safety of Nano
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Program Reference Code(s): 011E, 015E, 016E, 018E, 021E, 1045, 1187, 7237, 7974, 9102
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Program Element Code(s): 1179

ABSTRACT

Sharon Walker

University of California-Riverside

CAREER: Fundamentals of Nanoparticle Behavior in Water Treatment

CBET - 0954130

The fate, transport, and toxicity of human engineered nanomaterials released into in the environment, especially into wastewater treatment and surface and groundwater systems is a topic of great societal and scientific importance. The funded project is a systematic investigation of the physicochemical interactions between nanomaterials and the environment. Its goal is to assess the effectiveness of conventional wastewater treatment processes in trapping and/or removing common human-engineered nanoparticles from domestic water supplies. The work involves extensive nanoparticle characterization and transport experiments under environmentally relevant conditions. The behavior and interaction of three categories of nanoparticles will be examined: metal oxides (hematite, titanium oxide, cerium oxide, zinc oxide), metal (gold), and carbon-based (carbon nanotubes). The impact of various coating/capping agents such as Dextran, DMSA, and Polyamiline that are commonly used on these particles will also be examined. Both bare and coated/capped nanoparticles will be tested. Their stability, reactivity, and the effectiveness of removal will be evaluated at each of the four stages of water treatment: coagulation, flocculation, sedimentation, and filtration. Nanomaterial behavior over a wide range of water quality parameters, from simplified electrolytes to complex solution chemistries will be examined. Filtration mechanisms will also be investigated in microscopic and macroscopic flow systems. The impacts of nanoparticle characteristics such as electrophoretic mobility, hydrophobicity, crystalline structure, concentration, and size and shape on the efficiency and effectiveness of wastewater treatment processes will be examined using transmission electron microscopy, UV/Vis, time-resolved dynamic light scattering, fluorescent labeling, magnetic saturation, and other methods. Experiments will take place in packed bed columns and micromodel systems. Broader impacts of the research include improving our knowledge of nanoparticle transport and their trapping and removal from drinking water. The work supports an early career PI whose gender is underrepresented in the sciences and engineering, will engage Hispanic undergraduates from a local community college, and will be incorporated into undergraduate courses. The work will also partner K12 teachers and students at the Riverside Unified School District with university students through the preparation of materials on how to develop science faire projects on water quality.


PUBLICATIONS PRODUCED AS A RESULT OF THIS RESEARCH

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Honda, R.J.; Keene, V.; Daniels, L., Walker, S.L.. "Removal of TiO2 during primary water treatment: Role of coagulant type, dose, and nanoparticle concentration," Environmental Engineering Science, v.31, 2014, p. 127-134.

Honda, Ryan J., Keene, Valerie; Daniels, Louise; Walker, Sharon L. "Removal of TiO2 Nanoparticles During Primary Water Treatment: Role of Coagulant Type, Dose, and Nanoparticle Concentration," Environmental Engineering Science, v.31, 2014, p. 127.

Kinsinger, N.; Honda, R.J.; Keene, V.; Walker, S.L.. "Titanium Dioxide Nanoparticle Removal in Primary Prefiltration Stages of Water Treatment: Role of Coating, Natural Organic Matter, Source Water, and Solution Chemistry," Environmental Engineering Science, 2015, p. doi:10.10.

 

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