PMID- 22104766
OWN - NLM
STAT- MEDLINE
DCOM- 20120425
LR  - 20131121
IS  - 1873-3336 (Electronic)
IS  - 0304-3894 (Linking)
VI  - 199-200
DP  - 2012 Jan 15
TI  - Optimization of magnetic powdered activated carbon for aqueous Hg(II) removal and 
      magnetic recovery.
PG  - 9-14
LID - 10.1016/j.jhazmat.2011.10.023 [doi]
AB  - Activated carbon is known to adsorb aqueous Hg(II). MPAC (magnetic powdered 
      activated carbon) has the potential to remove aqueous Hg to less than 0.2 mug/L 
      while being magnetically recoverable. Magnetic recapture allows simple sorbent 
      separation from the waste stream while an isolated waste potentially allows for 
      mercury recycling. MPAC Hg-removal performance is verified by mercury mass 
      balance, calculated by quantifying adsorbed, volatilized, and residual aqueous 
      mercury. The batch reactor contained a sealed mercury-carbon contact chamber with 
      mixing and constant N(2) (g) headspace flow to an oxidizing trap. Mercury 
      adsorption was performed using spiked ultrapure water (100 mug/L Hg). Mercury 
      concentrations were obtained using EPA method 245.1 and cold vapor atomic 
      absorption spectroscopy. MPAC synthesis was optimized for Hg removal and sorbent 
      recovery according to the variables: C:Fe, thermal oxidation temperature and 
      time. The 3:1 C:Fe preserved most of the original sorbent surface area. As 
      indicated by XRD patterns, thermal oxidation reduced the amorphous characteristic 
      of the iron oxides but did not improve sorbent recovery and damaged porosity at 
      higher oxidation temperatures. Therefore, the optimal synthesis variables, 3:1 
      C:Fe mass ratio without thermal oxidation, which can achieve 92.5% (+/- 8.3%) 
      sorbent recovery and 96.3% (+/- 9%) Hg removal. The mass balance has been closed to 
      within approximately +/- 15%.
CI  - Copyright (c) 2011 Elsevier B.V. All rights reserved.
FAU - Faulconer, Emily K
AU  - Faulconer EK
AD  - Department of Environmental Engineering Sciences, University of Florida, 217 
      Black Hall, P.O. Box 116450, Gainesville, FL 32611-645, USA. 
      emily.faulconer@yahoo.com
FAU - von Reitzenstein, Natalia V Hoogesteijn
AU  - von Reitzenstein NV
FAU - Mazyck, David W
AU  - Mazyck DW
LA  - eng
PT  - Journal Article
DEP - 20111103
PL  - Netherlands
TA  - J Hazard Mater
JT  - Journal of hazardous materials
JID - 9422688
RN  - 7440-44-0 (Carbon)
RN  - FXS1BY2PGL (Mercury)
SB  - IM
MH  - Adsorption
MH  - Carbon/*chemistry
MH  - *Magnetics
MH  - Mercury/*isolation & purification
MH  - Oxidation-Reduction
MH  - Spectrophotometry, Atomic
MH  - X-Ray Diffraction
EDAT- 2011/11/23 06:00
MHDA- 2012/04/26 06:00
CRDT- 2011/11/23 06:00
PHST- 2011/05/20 00:00 [received]
PHST- 2011/08/30 00:00 [revised]
PHST- 2011/10/06 00:00 [accepted]
PHST- 2011/11/23 06:00 [entrez]
PHST- 2011/11/23 06:00 [pubmed]
PHST- 2012/04/26 06:00 [medline]
AID - S0304-3894(11)01263-5 [pii]
AID - 10.1016/j.jhazmat.2011.10.023 [doi]
PST - ppublish
SO  - J Hazard Mater. 2012 Jan 15;199-200:9-14. doi: 10.1016/j.jhazmat.2011.10.023. 
      Epub 2011 Nov 3.