Xiaopeng Min, Li Wang, Yin Wang (Advisor) Catalytic Destruction of Pharmaceuticals by Structured Palladium-based Material Xiaopeng Min, Li Wang, Yin Wang (Advisor) Department of Civil and Environmental Engineering University of Wisconsin-Milwaukee

Content Background Catalyst Design and Characterization Catalyst Performance Conclusion Future Work

Background Growing number of anthropogenic trace contaminants was detected in wastewater and drinking water sources Supported nanophase catalysts being developed to treat emerging contaminants

Background Pd H H H H -Cl -H Pd converts H2 to Hads, a potent reductant and hydrogenating agent Rational design of advanced structured material to enhance its water treatment suitability

Catalyst Design Synthesis Steps: Synthesis of magnetic Fe3O4 particle Synthesis of Fe3O4@nonporous SiO2 Synthesis of Fe3O4@nSiO2@mesoporous SiO2 Modification of Fe3O4@nSiO2@mSiO2 with -NH2 Deposition of Pd on Fe3O4@nSiO2@mSiO2-NH2

Catalyst Characterization

Catalyst Characterization

Catalyst Performance Diclofenac: 2-[(2,6-dichlorophenyl)amino]phenylacetate the anti-inflammatory drug low biodegradability  detected in surface and drinking waters

Catalyst Performance

Catalyst Performance

Catalyst Performance

Conclusion For the diclofenac concentrations of 10 and 20 mg/L, structured Pd-based catalyst (Fe3O4@nSiO2@Pd@mSiO2) can destruct the diclofenac by about 99.7% after 120 min and 99.1% after 240 min, respectively. Compared with commercial Pd@SiO2 material, immobilization of Pd in mesoporous structure (Fe3O4@nSiO2@Pd@mSiO2) enhanced the activity of catalytic dechlorination of diclofenac.

Future Work Immobilization of Pd using different functional group Treatment of various emerging contaminants Determination of the effectiveness in recycling application

Thank you ! Acknowledgment This work was financially supported by the fund from College of Engineering and Applied Science, University of Wisconsin-Milwaukee. Thank you !