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(1) M. Omole, V. Okello, V. Lee, L. Zhou, O. A. Sadik, ACS Catalysis , 2011, 1, 139-146. ;

Nanostructured Membrane that Captures, Removes and Catalytically Reduces Chromium (VI) to Cr(III) Omowunmi Sadik, SUNY at Binghamton, DMR 1007900.

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(1) M. Omole, V. Okello, V. Lee, L. Zhou, O. A. Sadik, ACS Catalysis , 2011, 1, 139-146. ;

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  1. Nanostructured Membrane that Captures, Removes and Catalytically Reduces Chromium (VI) to Cr(III) Omowunmi Sadik, SUNY at Binghamton, DMR 1007900 • Hexavalent chromium (Cr(VI)) is a proven carcinogen and a common pollutant at hazardous waste sites; whereas Cr(III) is believed to be an essential element and is readily precipitated or adsorbed as Cr(OH)3 by organic and inorganic substrates at neutral pH. • We have synthesized nanostructured poly (amic) acid membranes (nPAA) and utilized these as both reductant and stabilizer for in-situ chemical reduction of Cr (VI) to Cr (III)1. Results showed that Cr (VI) species were rapidly reduced with efficiency of 99.98% at 40ºC using catalytic Pd nanoparticles (PdNPs)2. • Unlike other reductants for Cr(VI) species (e.g. sulfur compounds, formic acid, dendritic polymers, carbon nanotubes or polyurethanes); nPAA creates a stable environment for the PdNPs while providing the electrons necessary for the reduction of Cr(VI) 2. • This dual role of the material is significant because for nanoscale materials to be effective, they must form stable dispersions in water for easy delivery to water-saturated materials in contaminated areas. Nanoporous PAA Membrane in a cross filtration process to capture, remove and catalytically reduce Cr(VI) to Cr(III). • (1) M. Omole, V. Okello, V. Lee, L. Zhou, O. A. Sadik, ACS Catalysis, 2011, 1, 139-146.; • (2)Sadik et al, Journal of Environmental Monitoring, 13, 1236, 2011

  2. NSF Materials World Network: strengthening international partnerships through research trainingOmowunmi Sadik, SUNY at Binghamton, DMR 1007900 Ms. Naumih Noah, 3rd from right, with members of the Sensors Group at the University of Western Cape, Cape Town, South Africa during her research visit in spring, 2011. PAA films synthesized through collaboration using thermal (a), phase inversion (b), electroless and electrochemical techniques (c-f). PAA cross-links with metals (g-i) through its carbonyl and amide functionalities. Broader Impact activities include international student exchanges, conference organization such as the recent Gordon Research Conference on Environmental Nanotechnology(http://www.grc.org/programs.aspx?year=2011&program=environano) and visits to local schools.

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