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Experimental Strategies

Kurt Whitford 1 , Melissa Stolz 2 , Hafiz Salih 3 , Dr. George Sorial 4. 1 Glen Este High School, Cincinnati, OH; 2 RA Jones Middle School, Florence, KY; 3 , 4 University of Cincinnati, Department of Civil and Environmental Engineering, Cincinnati, OH. Project Goals

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Experimental Strategies

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  1. Kurt Whitford1, Melissa Stolz2, Hafiz Salih3, Dr. George Sorial4 1Glen Este High School, Cincinnati, OH; 2RA Jones Middle School, Florence, KY; 3,4University of Cincinnati, Department of Civil and Environmental Engineering, Cincinnati, OH Project Goals This project seeks to investigate the impact of iron oxide nanoparticles on adsorption of trichloroethylene (TCE) by powdered activated carbon (PAC) in the presence and absence of NOM (Humic Acid). Secondary objectives are to calculate Freundlich isotherm constants for all TCE, PAC, NP and HA combinations and generate data on the kinetics of TCE adsorption onto PAC. Nanoparticles (NP) may adversely affect the adsorption of volatile organic compounds (VOC’s), onto activated carbon, the current best available technology for water treatment. This research focuses on the potentially inhibiting effects of humic acid (HA), NOM, and nanoparticle iron oxide on the adsorption of trichloroethylene (TCE) by powdered activated carbon (PAC). Six isotherms were prepared using various combinations of TCE, PAC, HA, and Fe2O3. The study established a relationship between the amount of TCE adsorbed and amount of PAC used. It was also found that NP ‘s act as a secondary adsorbent for TCE, though both PAC and NP adsorption of TCE is inhibited in the presence of humic acid. Results Fe2O3 increased the removal of TCE beyond that which was removed by PAC alone. Humic acid lowered the adsorption of TCE by PAC, diminishing the increases observed when nanoparticles are present. Abstract Nanoparticles: Good Technology = Bad Water?Effects of Iron Oxide Nanoparticles on Adsorption of TCE by PAC Introduction • Emergence of nanoscience in scores of industrial and scientific developments has generated a concern for environmental impact as an immeasurable quantity of nanoparticles is released into natural resources. Two potential effects on drinking water treatment are: • 1. NP may adsorb VOC bypass treatment by PAC completely • 2. NOM may compete with VOC for adsorption by PAC VOC won’t settle out (by blocking adsorption sites, filling sites, and • changing the electrical charges on NP) • This study will investigate these effects on water treatment. • 1. Adsorption of TCE onto iron oxide nanoparticles provides a mechanism for bypassing activated carbon treatment of water. • 2. Humic acid serves to further inhibit TCE adsorption in the presence of nanoparticles. • 3. Future research should focus on optimizing PAC performance in the presence of NOM and nanoparticles. Conclusions Experimental Strategies • Isotherm samples were • prepared using deionized water at pH 7 in amber bottles • treated with varying amounts of PAC • mixed for 14 days • filtered using 0.45 micrometer paper • analyzed for TCE adsorption using GC-FID References Adsorption of humic acid onto nanoscalezerovalent iron and its effect on arsenic removal. Giasuddin,A.B.; Kanel,S.R.; Choi,H. Environ.Sci.Technol., 2007, 41, 6, 2022-2027, United States TCE removal from contaminated soil and ground water Russell, H.H.; Matthews, J. E.; Sewell, G.W. US EPA, Office of Research and Development, EPA/540/S-92/002, Jan 1992, United States Nanomaterials in the environment: behavior, fate, bioavailability, and effects Klaine, S.J, et al. Environ. Toxicol. Chem., 2008, 27,9, 1825-1851, United States Science and technology of nanomaterials: current status and future prospects Rao, C.N.R.; Cheetham, A.K. J. Mater Chem, 2001, 11, 2887-2894, United Kingdom Acknowledgements The authors wish to acknowledge the contributions of Dr. AnantKukreti and Andrea Burrows, UC RET Program Coordinators.

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