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. 2017 Jul;8(4):435-443.
doi: 10.1016/j.jare.2017.06.002. Epub 2017 Jun 10.

Applications of CTAB modified magnetic nanoparticles for removal of chromium (VI) from contaminated water

Souad A Elfeky  1 , Shymaa Ebrahim Mahmoud  2 , Ahmed Fahmy Youssef  3
Affiliations

Applications of CTAB modified magnetic nanoparticles for removal of chromium (VI) from contaminated water

Souad A Elfeky et al. J Adv Res. 2017 Jul.

Abstract

This study investigated the elimination of Cr(VI) from aqueous solution utilizing a composite from magnetic nanoparticles (Fe3O4) capped with cetyltrimethylammonium bromide (CTAB). The structure of the prepared composite system was examined by Fourier Transform Infra Red Spectroscopy (FTIR), X-ray Diffractometry (XRD), and Transmission Electron Microscopy (TEM). Separation of the Fe3O4/CTAB composite from the wastewater can be achieved by application of an external magnetic field. Factors affecting the Cr(VI) expulsion from wastewater such as pH, competing ions, the dosage level of the nanoparticles, and contact time were studied. The results indicated that the maximum efficiency of the present system for removal of Cr(VI) (95.77%) was in acidic conditions (pH 4), contact time 12 h, and composite dosage of 12 mg/mL. The used Cr(VI) concentration was 100 mg/L. Considering results, the Fe3O4/CTAB system showed a high capability and selectivity for the treatment of water sullied with Cr(VI). This can recede the mutagenic and carcinogenic health risk caused by Cr(VI) water tainting.

Keywords: Composite dosage; Cr(VI); Magnetic nanoparticles; TEM; XRD; pH.

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Figures

None
Graphical abstract
Scheme 1
Scheme 1
Adsorption and reduction of Cr(VI) on the surface of Fe3O4/CTAB nanocomposite.
Fig. 1
Fig. 1
XRD pattern for Fe3O4 nanoparticles.
Fig. 2
Fig. 2
FTIR of CTAB (a) and Fe3O4/CTAB nanocomposite (b).
Fig. 3
Fig. 3
TEM (a) and HRTEM (b) images of Fe3O4 nanoparticles.
Fig. 4
Fig. 4
Removal% of Cr(VI) using different dosages from Fe3O4 nanoparticles (a) and Fe3O4/CTAB nanocomposite (b) at pH 4.
Fig. 5
Fig. 5
Time dependence for the adsorption capacity of Cr(VI) using different dosages from Fe3O4 nanoparticles (a) and Fe3O4/CTAB nanocomposite (b) at pH 4 and 10 h contact time.
Fig. 6
Fig. 6
Plot of pseudo first order (a) and pseudo second order (b) models for the sorption of Cr(VI) from contaminated sample using Fe3O4/CTAB nanocomposite.
Fig. 7
Fig. 7
Adsorption isotherm of Cr(VI) ion onto the Fe3O4/CTAB nanocomposite plotted by (a) Langmuir model and (b) Freundlich model.
Fig. 8
Fig. 8
The removal% of Cr(VI) using Fe3O4/CTAB nanocomposite (12 mg/mL) at pH 4 and 12 h contact time in the presence of SO42−, NO2− or PO43− as interfering anions in a binary system.
Fig. 9
Fig. 9
Comparison between the removal% of Cr(VI) in the model sample and real field sample using the Fe3O4/CTAB nanocomposite (12 mg/mL) at pH 4.
See this image and copyright information in PMC

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