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Chromium ion removal from raw water by magnetic iron composites and Shewanella oneidensis MR-1.
- Source :
-
Scientific reports [Sci Rep] 2019 Mar 06; Vol. 9 (1), pp. 3687. Date of Electronic Publication: 2019 Mar 06. - Publication Year :
- 2019
-
Abstract
- In this study, nanoiron active carbon composites (NZVI/GAC) were used to remove chromium ions from raw water. The composites were synthesized from a novel formula of biological activated carbon and characterized by various techniques. The adsorption test data were fit by a pseudo-second-order kinetic model and Langmuir model. The q <subscript>e</subscript> and R <superscript>2</superscript> values were 187 mg Cr/g and 0.9960, respectively, with 0.2 g/L NZVI/GAC at an initial concentration of 118 mg/L Cr according to the Langmuir isotherm model. Moreover, a Cr <superscript>6+</superscript> detoxification reactor was constructed with the magnetic iron composite. The results indicated that the synthesized magnetic iron composite was a significant adsorbent for Cr <superscript>6+</superscript> removal from aqueous solutions. The detoxification reactor was able to remove Cr <superscript>6+</superscript> from raw water at an initial concentration of 26.5 mg/L within a short time period (3-5 min), with a removal efficiency of up to 99.90% and a treatment capacity of 45.0 mg Cr <superscript>6+</superscript> /g of adsorbent; the Cr <superscript>6+</superscript> concentrations in the outflow met the GB5749-2006 requirements for drinking water. A synergistic effect between NZVI/GAC and a suspension of the bacterium Shewanella oneidensis MR-1 was found, showing that this bacterium can be used as a regeneration agent for iron-depleted activated carbon materials.
Details
- Language :
- English
- ISSN :
- 2045-2322
- Volume :
- 9
- Issue :
- 1
- Database :
- MEDLINE
- Journal :
- Scientific reports
- Publication Type :
- Academic Journal
- Accession number :
- 30842441
- Full Text :
- https://doi.org/10.1038/s41598-018-37470-1