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Application of stabilized Fe 0 nanoparticles for remediation of Cr(VI)‐spiked soil
Author(s) -
Reyhanitabar A.,
Alidokht L.,
Khataee A. R.,
Oustan S.
Publication year - 2012
Publication title -
european journal of soil science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.244
H-Index - 111
eISSN - 1365-2389
pISSN - 1351-0754
DOI - 10.1111/j.1365-2389.2012.01447.x
Subject(s) - chromium , nanoparticle , chemistry , nuclear chemistry , suspension (topology) , environmental remediation , starch , particle size , materials science , nanotechnology , contamination , organic chemistry , mathematics , ecology , homotopy , pure mathematics , biology
In this study, laboratory batch experiments were conducted on a chromium (Cr)‐spiked soil to evaluate the effectiveness of synthesized starch‐stabilized iron (Fe 0 ) nanoparticles and compared with Fe 0 and Fe 3 O 4 with different particle sizes, and also with decreasing water‐extractable Cr(VI). Comparative studies were carried out at a Cr(VI) concentration of 100 mg kg −1 and a Fe materials dosage of 1.5% w/w. Results indicated that stabilized Fe 0 nanoparticles had a greater efficiency (100%) to immobilize Cr(VI). The efficiency of the iron materials that we used for immobilization of Cr(VI) was in the following order: starch‐stabilized Fe 0 nanoparticles > non‐stabilized Fe 0 nanoparticles > Fe 3 O 4 nanoparticles > Fe 0 micro‐particles > Fe 3 O 4 micro‐particles. Several factors affecting the immobilization of Cr(VI) by stabilized Fe 0 nanoparticles, including reaction time, initial Cr(VI) concentration in soil, Fe 0 nanoparticles dosage and soil‐solution suspension pH, were investigated. The overall rate of the Cr(VI) immobilization process was quick and almost 50% of the immobilization was reached within the first 2 minutes of the reaction. Cr(VI) immobilization percentages decreased from 100 to 54% as the initial Cr(VI) concentration increased from 50 to 1650 mg kg −1 . Furthermore, increasing Fe 0 nanoparticles dosage from 0.5 to 3% w/w caused a 70% increase in the immobilization efficiency. The results indicated that increasing the soil suspension pH from 5 to 9, in both buffered and unbuffered conditions, did not have any significant effect on the extent of water‐extractable Cr(VI).