Abstract
The effectiveness of nanoscale zero-valent iron (nZVI) to remove heavy metals from water is reduced by its low durability, poor mechanical strength, and tendency to form aggregates. A composite of zeolite and nanoscale zero-valent iron (Z-nZVI) overcomes these problems and shows good potential to remove Pb from water. FTIR spectra support nZVI loading onto the zeolite and reduced Fe0 oxidation in the Z-nZVI composite. Scanning electron micrographs show aggregation was eliminated and transmission electron micrographs show well-dispersed nZVI in chain-like structures within the zeolite matrix. The mean surface area of the composite was 80.37m2/g, much greater than zeolite (1.03m2/g) or nZVI (12.25m2/g) alone, as determined by BET-N2 measurement. More than 96% of the Pb(II) was removed from 100mL of solution containing 100mg Pb(II)/L within 140min of mixing with 0.1g Z-nZVI. Tests with solution containing 1000mg Pb(II)/L suggested that the capacity of the Z-nZVI is about 806mg Pb(II)/g. Energy-dispersive X-ray spectroscopy showed the presence of Fe in the composite; X-ray diffraction confirmed formation and immobilization of Fe0 and subsequent sorption and reduction of some of the Pb(II) to Pb0. The low quantity of Pb(II) recovered in water-soluble and Ca(NO3)2-extractable fractions indicate low bioavailability of the Pb(II) removed by the composite. Results support the potential use of the Z-nZVI composite in permeable reactive barriers.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 54-60 |
| Number of pages | 7 |
| Journal | Chemical Engineering Journal |
| Volume | 217 |
| DOIs | |
| State | Published - Feb 1 2013 |
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Keywords
- Composite
- Heavy metals
- Nanoscale
- Zeolite
- Zero-valent iron
ASJC Scopus subject areas
- Chemistry(all)
- Environmental Chemistry
- Chemical Engineering(all)
- Industrial and Manufacturing Engineering
Cite this
Removal of Pb(II) from aqueous solution by a zeolite-nanoscale zero-valent iron composite. / Kim, Seol Ah; Kamala-Kannan, Seralathan; Lee, Kui Jae; Park, Yool Jin; Shea, Patrick J.; Lee, Wang Hyu; Kim, Hyung Moo; Oh, Byung Taek.
In: Chemical Engineering Journal, Vol. 217, 01.02.2013, p. 54-60.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Removal of Pb(II) from aqueous solution by a zeolite-nanoscale zero-valent iron composite
AU - Kim, Seol Ah
AU - Kamala-Kannan, Seralathan
AU - Lee, Kui Jae
AU - Park, Yool Jin
AU - Shea, Patrick J.
AU - Lee, Wang Hyu
AU - Kim, Hyung Moo
AU - Oh, Byung Taek
PY - 2013/2/1
Y1 - 2013/2/1
N2 - The effectiveness of nanoscale zero-valent iron (nZVI) to remove heavy metals from water is reduced by its low durability, poor mechanical strength, and tendency to form aggregates. A composite of zeolite and nanoscale zero-valent iron (Z-nZVI) overcomes these problems and shows good potential to remove Pb from water. FTIR spectra support nZVI loading onto the zeolite and reduced Fe0 oxidation in the Z-nZVI composite. Scanning electron micrographs show aggregation was eliminated and transmission electron micrographs show well-dispersed nZVI in chain-like structures within the zeolite matrix. The mean surface area of the composite was 80.37m2/g, much greater than zeolite (1.03m2/g) or nZVI (12.25m2/g) alone, as determined by BET-N2 measurement. More than 96% of the Pb(II) was removed from 100mL of solution containing 100mg Pb(II)/L within 140min of mixing with 0.1g Z-nZVI. Tests with solution containing 1000mg Pb(II)/L suggested that the capacity of the Z-nZVI is about 806mg Pb(II)/g. Energy-dispersive X-ray spectroscopy showed the presence of Fe in the composite; X-ray diffraction confirmed formation and immobilization of Fe0 and subsequent sorption and reduction of some of the Pb(II) to Pb0. The low quantity of Pb(II) recovered in water-soluble and Ca(NO3)2-extractable fractions indicate low bioavailability of the Pb(II) removed by the composite. Results support the potential use of the Z-nZVI composite in permeable reactive barriers.
AB - The effectiveness of nanoscale zero-valent iron (nZVI) to remove heavy metals from water is reduced by its low durability, poor mechanical strength, and tendency to form aggregates. A composite of zeolite and nanoscale zero-valent iron (Z-nZVI) overcomes these problems and shows good potential to remove Pb from water. FTIR spectra support nZVI loading onto the zeolite and reduced Fe0 oxidation in the Z-nZVI composite. Scanning electron micrographs show aggregation was eliminated and transmission electron micrographs show well-dispersed nZVI in chain-like structures within the zeolite matrix. The mean surface area of the composite was 80.37m2/g, much greater than zeolite (1.03m2/g) or nZVI (12.25m2/g) alone, as determined by BET-N2 measurement. More than 96% of the Pb(II) was removed from 100mL of solution containing 100mg Pb(II)/L within 140min of mixing with 0.1g Z-nZVI. Tests with solution containing 1000mg Pb(II)/L suggested that the capacity of the Z-nZVI is about 806mg Pb(II)/g. Energy-dispersive X-ray spectroscopy showed the presence of Fe in the composite; X-ray diffraction confirmed formation and immobilization of Fe0 and subsequent sorption and reduction of some of the Pb(II) to Pb0. The low quantity of Pb(II) recovered in water-soluble and Ca(NO3)2-extractable fractions indicate low bioavailability of the Pb(II) removed by the composite. Results support the potential use of the Z-nZVI composite in permeable reactive barriers.
KW - Composite
KW - Heavy metals
KW - Nanoscale
KW - Zeolite
KW - Zero-valent iron
UR - http://www.scopus.com/inward/record.url?scp=84871369089&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84871369089&partnerID=8YFLogxK
U2 - 10.1016/j.cej.2012.11.097
DO - 10.1016/j.cej.2012.11.097
M3 - Article
AN - SCOPUS:84871369089
VL - 217
SP - 54
EP - 60
JO - Chemical Engineering Journal
JF - Chemical Engineering Journal
SN - 1385-8947
ER -