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Materials 2017, 10(7), 783; https://doi.org/10.3390/ma10070783

Microwave-Assisted Synthesis of Goethite Nanoparticles Used for Removal of Cr(VI) from Aqueous Solution

1
Central European Institute of Technology, Brno University of Technology, 612 00 Brno, Czech Republic
2
Faculty of Chemistry, Thai Nguyen University of Sciences, 251580 Thai Nguyen, Vietnam
3
Department of Geology and Pedology, Mendel University in Brno, 613 00 Brno, Czech Republic
4
Department of Chemistry and Biochemistry, Mendel University in Brno, 613 00 Brno, Czech Republic
*
Author to whom correspondence should be addressed.
Received: 31 May 2017 / Revised: 4 July 2017 / Accepted: 4 July 2017 / Published: 11 July 2017
(This article belongs to the Special Issue Sorption Materials for Environment Purification)
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Abstract

The microwave-assisted synthesis of goethite nanoparticles has been studied. The samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), thermogravimetric analysis (TGA), differential thermal analysis (DTA) and Brunauer–Emmett–Teller (BET) method. Goethite rod-like nanoparticles have been successfully synthesized in 10 min of microwave treating at 100 °C. Particle size is in the range from 30 to 60 nm in width and from 200 to 350 nm in length. BET analysis indicated that the surface area of the product is 158.31 m2g−1. The feasibility of Cr(VI) removal fromaqueous solution depends on the pH of the solution and contact time. The maximum adsorptionis reached at pH 4.0 and 540 min of contact time. The adsorption kinetics was analyzedby the pseudo-first- and second-order models and the results reveal that the adsorption process obeys the pseudo-second-order model. The adsorption data were fitted well with the Langmuir adsorption isotherm. View Full-Text
Keywords: goethite nanoparticles; microwave; Cr(VI) removal goethite nanoparticles; microwave; Cr(VI) removal
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Nguyen, V.D.; Kynicky, J.; Ambrozova, P.; Adam, V. Microwave-Assisted Synthesis of Goethite Nanoparticles Used for Removal of Cr(VI) from Aqueous Solution. Materials 2017, 10, 783.

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