Electrosorption of Metal ions

from Aquebous Solutions

NTHU MSCL

Adviser: C. H. Liu

C. He Yeh

S. Yiacoumi , T.-Y. Ying, and K.-L. Yang School of Civil and Environmental Engineering Georgia Institute of Technology Atlanta, GA 30332-0512

Outline

Introduction & Background Principle & Experiment Conclusion Further Application

Ion exchange Evaporation (thermal) Electrodialysis Reverse osmosis Porous electrodes

ElectrodepositedElectrosorption

Introduction & Background

Principle & Experiment

ElectrosorptionSurface area (monolayer but large area)Regeneration efficiencyLess energy consume, low cost

Requirementhigh surface area low electrical resistancegood polarizabilityno participation

Principle & Experiment

Carbon aerogelHighly porous, High surface area(400~1000m2/g)Low R( ≤40 m Ω)Controllable pore size (Na+,K+<2nm, 2~50nm)

Important electrosorption parameterspore size (available surface area)Capacitance (electrosorption per unit area )

Using carbon aerogel as electrodes

Principle & Experiment Mechanism on porous electrode

ElectricalChemical

Groundwater and Wastewater treatment InorganicRadionuclideMetal ionsAnions

NaF, NaCl (chemisorption is insignificant)

Principle & Experiment

TEM / Carbon aerogel

Principle & Experiment

Principle & Experiment

Conclusion

Electrosorption is an ideal process for removing ions from aqueous solutions

Capability increases Increase of the initial solution concentration Increase of applied voltageProperties of the electrodes

Further Application

Capacitive Deionization of NaCl Solution using Four-Series Cells with Carbon Aerogel Composite Electrodes

Further Application

Separation of Metal Ions from Liquid Waste (uranium)

Further Application

Secondary DEP buffer/de-ion preparation Whole blood DEP preparation Carbon aerogel as a scaffold

Further Application

Secondary DEP buffer/de-ion preparation Whole blood DEP preparation Carbon aerogel as a scaffold

"Carbon Aerogel Electrodes: Adsorption-Desorption and Regeneration Study for Purification of Water" Sanjay Tewari

"ELECTROSORPTION OF METAL IONS FROM AQUEOUS SOLUTIONS" S. Yiacoumi , T.-Y. Ying, and K.-L. Yang School of Civil and Environmental Engineering Georgia Institute of Technology Atlanta, GA 30332-0512

"Removal of Ni and Cu ions from aqueous solutions by means of a hybrid electrosorption/electrodialysis process" VD Grebenyuk1, NA Linkov2 and VM Linkov2* 1 Institute of Colloid and Water Chemistry, Ukranian National Academy of Sciences, Kiev-142, Ukraine2 Department of Chemistry, University of the Western Cape, Bellville 7535, South Africa

Reference

"Separation of Metal Ions from Liquid Waste" Dr. G. Glasgow; glasgow@apsci.com; 937-766-2020Applied Sciences, Inc.PO Box 579Cedarville, OH 45314E. Kennel: ekennel@apsci.com; 937-766-2020Applied Sciences, Inc.PO Box 579Cedarville, OH 45314Dr. J. Zondlo; Zondlo@cmer.wvu.edu; 304-293-2111Department of Chemical EngineeringWest Virginia UniversityMorgantown, WV 26506S. Stover; Sstover299@aol.com; 304-293-2111Department of Chemical EngineeringWest Virginia UniversityMorgantown, WV 26506

Reference

"Capacitive Deionization of NaCl Solution using Four-Series Cells with Carbon Aerogel Composite Electrodes"Chun-Mo Yang a,*, Gi Taek Lee a, Byung-Ki Na c, Dong Jin Suhb, Byung Won Cho a, and Won Il Cho aa Eco - Nano Research Center, Korea Institute of Science andTechnology, Seoul, 136-791, Koreab Clean Technology Research Center, Korea Institute of Scienceand Technology, Seoul, 136-791, Koreac Division of Chemical Engineering, Chungbuk NationalUniversity, Chungbuk 361-763, Korea

Reference