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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.

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


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.


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

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