TechConnectWorld 2011 Conference and Expo TechConnect World 2011 Nanotech 2011 Clean Technology 2011 Microtech 2011 Bio Nanotech 2011 TechConnect Summit and Expo 2011

Removal of Selenium from Aqueous Solutions Using Magnetite Nanoparticles as Adsorbent

X. Wei, S. Bhojappa, L.-S. Lin, R.C. Viadero
SUNY Institute of Technology, US

Keywords: selenium, magnetite nanoparticles, adsorption isotherm, adsorption thermodynamics


Selenium (Se) is an emerging contaminant for many regions worldwide especially for areas impacted by past or current mining activities. The objective of this study was to evaluate the effectiveness of synthesized magnetite nanoparticles as an adsorbent in removing Se from aqueous solutions. In this study, a series of batch adsorption experiments were conducted to study adsorption kinetics, isotherms, and adsorptive thermodynamics in conjunction with studies on the effects of pH, temperature, concentration, contact time, and presence of competing anions on Se removal efficiency. As opposed to either natural magnetite (<5µm) or nano-iron (~10 nm), magnetite nanoparticles(10-20 nm) were found to be a better adsorbent for selenite, while nano-iron showed better adsorption performance for selenate (Figure 1). A final concentration of < 5 µg-Se/L could be achieved in removing selenite using magnetite nanoparticles from initial Se concentrations of 100 µg-Se/L or lower, comparable to those commonly found in mine water or mining impacted streams. The selective Se adsorption demonstrated magnetite nanoparticles could be a very promising nano-sorbent in treating Se laden waters and wastewaters.
Sessions Monday Tuesday Wednesday Thursday Authors Keywords Affiliations Search

TechConnect World 2011 Nanotech 2011 Clean Technology 2011 Microtech 2011 BioNanotech 2011 TechConnect Summit 2011
2011 Events | Program | Speaker | Short Courses Sponsor Exhibit/Showcase Press Venue Register
Subscribe | Contact | Site Map
© Copyright 2010 TechConnect World. All Rights Reserved.