Issue 39, 2017, Issue in Progress

Facile synthesis of MoS2/reduced graphene oxide composites for efficient removal of Cr(vi) from aqueous solutions

Abstract

Cr(VI) as a common heavy metal contaminate has attracted much attention for its high toxicity and bioaccumulation. In this study, novel adsorbents, MoS2/reduced graphene oxide composites (MoS2/rGO), were prepared via a facile solvothermal process and effectively used for Cr(VI) adsorption. The MoS2/rGO was characterized by SEM, TEM, XRD, BET and XPS. Results showed that the MoS2 layers had been successfully grown on the surface of reduced graphene oxide layers. MoS2/rGO exhibited an enhanced surface area of 81.34 m2 g−1, more than rGO (57.20 m2 g−1) and MoS2 (1.57 m2 g−1). Batch adsorption experiments of Cr(VI) were also investigated. The pseudo-second order model best described the adsorption kinetics. Effective Cr(VI) removal occurred in a wide pH range from 2.0 to 10.0. The excellent adsorption capacity at 25 °C, calculated from the Langmuir isotherm model, was 268.82 mg g−1 at pH 2.0 and 192.63 mg g−1 at pH 4.6. The electrostatic attraction and reduction on the adsorbents surface was considered to be the possible mechanism of Cr(VI) removal. These studies revealed the potential application of MoS2/rGO for Cr(VI) removal.

Graphical abstract: Facile synthesis of MoS2/reduced graphene oxide composites for efficient removal of Cr(vi) from aqueous solutions

Supplementary files

Article information

Article type
Paper
Submitted
27 Mar 2017
Accepted
19 Apr 2017
First published
03 May 2017
This article is Open Access
Creative Commons BY-NC license

RSC Adv., 2017,7, 24149-24156

Facile synthesis of MoS2/reduced graphene oxide composites for efficient removal of Cr(VI) from aqueous solutions

X. Jiang, H. Luo, Y. Yin and W. Zhou, RSC Adv., 2017, 7, 24149 DOI: 10.1039/C7RA03531D

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