Journal
LANGMUIR
Volume 34, Issue 28, Pages 8223-8229Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.langmuir.8b00607
Keywords
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Funding
- Natural Science Foundation of Liaoning Province [201602048]
- National Science Foundation of China [51773024]
- China Scholarship Council [20163035]
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A concise and facile sol-gel method to prepare multiple magnetic SiO2/FexOy , hollow porous spheres was developed. A series of SiO2/FexOy hollow porous spheres consisting of single shell, yolk-shell, double shells, and triple shells could be obtained by simply adjusting the formaldehyde amount, as Fe(acac)(3) was used as the shell-forming promoter. As the formaldehyde amount increases, the morphology of the as-prepared hollow spheres changed from single-shelled, yolk-shelled, double-shelled, to triple-shelled and then turned back. The spheres possess a large specific surface area (similar to 966 m(2)/g), uniform mesopores (similar to 4.5 nm), and large pore volume (1.37 cm(3)/g). Moreover, the yolk-shelled spheres have been successfully used in in situ adsorbing and reducing heavy metal ions in aqueous solution; the results suggested that it was an efficient adsorbent and convenient to concentrate from water.
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