Chapter 12
Downloaded by STANFORD UNIV on June 17, 2013 | http://pubs.acs.org Publication Date (Web): March 18, 2013 | doi: 10.1021/bk-2013-1123.ch012
Hematite Nanoparticle Modified Granular Activated Carbon for Removal of Arsenic and Organic Co-Contaminants Arti Jain, Jeremy Sanner, Robert Sandoval, and Kiril Hristovski* Environmental Technology, Department of Applied Sciences and Mathematics, College of Technology and Innovation, Arizona State University at the Polytechnic Campus, 6073 South Backus Mall, Mesa, Arizona 85212, United States *E-mail:
[email protected]. Telephone: 1-480-727-1291
The goal of this study was to determine whether hematite nanoparticles could be synthesized within the pores of granular activated carbon (GAC) media by hydrolysis of ferric salt to effectively remove arsenic and organic co-contaminant from water. Five task-oriented objectives were undertaken to address this goal: (1) hematite modified GAC media was fabricated; (2) properties of the fabricated media were characterized; (3) arsenic adsorption capacity was evaluated under batch pseudo-equilibrium conditions in different water matrices; (4) adsorption capacity of the fabricated media was evaluated for model organic co-contaminant (methylene blue) under batch pseudo-equilibrium conditions; and (5) short bed column tests were conducted to estimate adsorption capacity under continuous flow conditions. Four different hybrid media were fabricated characterized with iron contents ranging from 0.9% to 4.4% of Fe per dry weight. Longer hydrolysis times in solutions with lower concentrations of ferric salt allow for higher iron content, better distribution of the nanoparticles and formation of pore volume in the macropore region. Characterized by the low Freundlich intensity parameters (1/n
