Journal
JOURNAL OF CLEANER PRODUCTION
Volume 176, Issue -, Pages 929-936Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jclepro.2017.12.026
Keywords
Green synthesis; Iron nanoparticles; Mechanism; Cr(VI); Effect parameters
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Funding
- National Nature Science Foundation of China [41401585]
- Australian Research Council Future Fellowship Scheme [FT120100799]
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Iron-based nanoparticles (Fe-NPs) were successfully green synthesized using eucalyptus leaf extracts. Subsequently Fe-NPs were used to remove Cr(VI) from aqueous solution under varying experimental conditions, including temperature, pH, initial Cr(VI) concentration and Fe-NPs loading. Under optimal experimental conditions, 84.6% of total chromium and 98.6% of Cr(VI) were removed. The removal efficiency of Cr(VI) was still relatively high (55.7%) even after reusing the material four times. Nanoparticles were characterized using a range of techniques such as DLS, EDS, FTIR, SEM and XRD both before and after interaction with Cr. This characterization revealed the existence of chromium and its oxide or complex on the surface of Fe-NPs, indicating that adsorption of Cr(VI) was occurring and a mechanism of Cr(VI) removal was proposed. Batch experiments revealed that the reduction kinetics followed a pseudo second order rate model whereas adsorption was best fitted to the Langmuir model (R-2 = 0.999) with q(m) = 20.5 mg g(-1) and b = 3.6 L mg(-1). (C) 2017 Elsevier Ltd. All rights reserved.
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