Fabrication and Characterization of Porous Core–Shell Graphene/SiO2 Nanocomposites for the Removal of Cationic Neutral Red Dye

Junyi Wang; Tianlu Chen; Biao Xu; Yueqiu Chen

doi:10.3390/app10238529

journal article Open Access Nov 28, 2020

Fabrication and Characterization of Porous Core–Shell Graphene/SiO2 Nanocomposites for the Removal of Cationic Neutral Red Dye

Junyi Wang

Tianlu Chen

Biao Xu

Yueqiu Chen

Applied Sciences Vol. 10 No. 23 pp. 8529 · MDPI AG

View at Publisher Save 10.3390/app10238529

Abstract

Porous rGO/SiO2 nanocomposites with a “core-shell” structure were prepared as an efficient adsorbent for the liquid-phase adsorption of cationic neutral red (NR) dye. The samples were characterized with powder X-ray diffraction (XRD), field-emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), thermogravimetric analysis (TG), X-ray photoelectron spectroscopy (XPS), Raman spectroscopy, and N2 and water vapor adsorption/desorption methods. The NR removal ability and kinetics of the adsorption process of SiO2 and the rGO/SiO2 nanocomposites were investigated at 298 K. The rGO/SiO2 nanocomposite SG 0.30 showed a superior adsorption of NR dye. In regard to NR at pH 5, we measured a superior adsorption capacity of 66.635 mg/g at an initial NR concentration of 50 mg/L. The experimental adsorption capacity of SG 0.30 was 3.791 times higher than that of SiO2. Then, we compared the results with similar materials used for NR removal. Moreover, the water adsorption sites provided by the nitrogen- and oxygen-containing groups might be one of the reasons for the increased adsorption of water vapor. The broad range of properties of the rGO/SiO2 nanocomposite, including its simple synthesis, ability to be mass prepared, and strong adsorption properties, makes it a truly novel adsorbent that can be industrially produced, and shows potential application in the treatment of wastewater-containing dyes.

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Details

Published: Nov 28, 2020
Vol/Issue: 10(23)
Pages: 8529
License: View

Authors

J

Junyi Wang

Haixi Institutes, Chinese Academy of Sciences (CAS), Fuzhou 350002, Fujian, China; College of Chemistry and Materials Science, Fujian Normal University, Fuzhou 350007, Fujian, China

T

Tianlu Chen

Haixi Institutes, Chinese Academy of Sciences (CAS), Fuzhou 350002, Fujian, China

B

Biao Xu

Haixi Institutes, Chinese Academy of Sciences (CAS), Fuzhou 350002, Fujian, China

Y

Yueqiu Chen

Haixi Institutes, Chinese Academy of Sciences (CAS), Fuzhou 350002, Fujian, China

Cite This Article

Junyi Wang, Tianlu Chen, Biao Xu, et al. (2020). Fabrication and Characterization of Porous Core–Shell Graphene/SiO2 Nanocomposites for the Removal of Cationic Neutral Red Dye. Applied Sciences, 10(23), 8529. https://doi.org/10.3390/app10238529

Fabrication and Characterization of Porous Core–Shell Graphene/SiO2 Nanocomposites for the Removal of Cationic Neutral Red Dye

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