Preparation of amidoxime-functionalized mesoporous silica nanospheres (ami-MSN) from coal fly ash for the removal of U(VI)

Preparation of amidoxime-functionalized mesoporous silica nanospheres (ami-MSN) from coal fly ash... It is usually difficult to control the microstructure of mesoporous silica materials using coal fly ash as raw materials. In this study, amidoxime-functionalized mesoporous silica nanospheres (ami-MSN) were prepared from coal fly ash using a novel interfacial cohydrolysis-condensation method in an alkane-aqueous system. Characterizations suggested a regular microstructure, high specific surface area (676 m2/g) as well as stable and uniformly distributed amidoxime groups in the ami-MSN framework. Furthermore, ami-MSN displays a high U(VI) removal capacity in sorption experiments (98.9% removal efficiency of 50 ppm U(VI) at a dosage of 600 mg/L). The sorption showed significant pH dependence. Introducing various cations and anions showed differing effects on sorption, which can be attributed to differing complexation abilities of ions/ami-MSN/U(VI). The sorption mechanism was also studied. In pursuit of the strategy of “treating wastewater with materials derived from waste,” this work suggests that ami-MSN can be an effective and low-cost sorbent for U(VI) removal. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Science of the Total Environment Elsevier

Preparation of amidoxime-functionalized mesoporous silica nanospheres (ami-MSN) from coal fly ash for the removal of U(VI)

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Publisher
Elsevier
Copyright
Copyright © 2018 Elsevier B.V.
ISSN
0048-9697
eISSN
1879-1026
D.O.I.
10.1016/j.scitotenv.2018.01.057
Publisher site
See Article on Publisher Site

Abstract

It is usually difficult to control the microstructure of mesoporous silica materials using coal fly ash as raw materials. In this study, amidoxime-functionalized mesoporous silica nanospheres (ami-MSN) were prepared from coal fly ash using a novel interfacial cohydrolysis-condensation method in an alkane-aqueous system. Characterizations suggested a regular microstructure, high specific surface area (676 m2/g) as well as stable and uniformly distributed amidoxime groups in the ami-MSN framework. Furthermore, ami-MSN displays a high U(VI) removal capacity in sorption experiments (98.9% removal efficiency of 50 ppm U(VI) at a dosage of 600 mg/L). The sorption showed significant pH dependence. Introducing various cations and anions showed differing effects on sorption, which can be attributed to differing complexation abilities of ions/ami-MSN/U(VI). The sorption mechanism was also studied. In pursuit of the strategy of “treating wastewater with materials derived from waste,” this work suggests that ami-MSN can be an effective and low-cost sorbent for U(VI) removal.

Journal

Science of the Total EnvironmentElsevier

Published: Jun 1, 2018

References

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