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Environ Technol. 2019 Dec 10:1-9. doi: 10.1080/09593330.2019.1696412. [Epub ahead of print]

Fabrication of RHA-silica/graphene oxide nanocomposites for removal of lead ions from water.

Author information

1
VNU-HCM Key Laboratory of Chemical Engineering and Petroleum Processing (CEPP Lab), Ho Chi Minh City, Vietnam.
2
Faculty of Chemical Engineering, HCMC University of Food Industry, Ho Chi Minh City, Vietnam.
3
Faculty of Chemical Engineering, Ho Chi Minh City University of Technology - Vietnam National University Ho Chi Minh City, Ho Chi Minh City, Vietnam.

Abstract

In this study, rice husk ash-silica/graphene oxide (RHA-SiO2/GO) nanocomposites were synthesized by the in situ method using (3-aminopropyl) triethoxysilane as a coupling agent. The obtained products were used to remove lead ions (Pb2+) from aqueous solution. Effects of SiO2:GO mass ratio, contact time, pH and initial Pb2+ concentration on the adsorption capacity were studied. It was found that the suitable ratio of SiO2:GO for Pb2+ adsorption is 100:2. The suitable RHA-SiO2/GO was characterized by Fourier-transform infrared spectroscopy, X-ray diffraction, transmission electron microscopy, Brunauer-Emmett-Teller specific surface area and thermal gravimetric analysis. Accordingly, RHA-SiO2/GO nanocomposite could be used as promising adsorbent for the removal of Pb2+ from water.

KEYWORDS:

Rice husk ash-silica; adsorption; graphene oxide; lead; nanocomposite

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