Journal
JOURNAL OF SUPERCRITICAL FLUIDS
Volume 184, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.supflu.2022.105561
Keywords
Ostwald ripening process; Rapid depressurization methodology; Porous nanospheres; Hollow Polystyrene/Poly(divinylbenzene-co-methacrylic acid)@Fe3O4/Tannic acid@Ag nanospheres; Catalysis
Categories
Funding
- Priority Ac-ademic Program Development of Jiangsu Higher Education Institutions (PAPD) [2242016K41020]
- Fundamental Research Funds for The Central Univer-sities
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This work presents a reproducible and well-controlled method to fabricate hollow nanocomposites with high catalytic efficiency. The nanocomposites show great potential in degrading dyes and can be recycled multiple times without significant loss in performance.
Porous nanospheres have potential applications in reactions, catalysis and water treatment because of their high surface area, low density and high loading capacity. In this work, a reproducible and well-controlled way to fabricate hollow Polystyrene/Poly(divinylbenzene-co-methacrylic acid)@Fe3O4/Tannic acid@Ag (PS/P(DVB-co-MAA)@Fe3O4/TA@Ag) nanocomposites with high catalytic efficiency is developed. Firstly, hollow Polystyrene/Poly(divinylbenzene-co-methacrylic acid) (PS/P(DVB-co-MAA)) nanospheres with an open hole on the surface are produced by supercritical carbon dioxide (scCO(2)) rapid depressurization methodology. The consequence shows that structure of polymer nanospheres is controllable by altering the reactive conditions, like temperature, pressure, solvent ratio, degree of cross-linking and time. Secondly, the magnetic Fe(3)O(4)and Ag nanoparticles are deposited onto the surface of hollow PS/P(DVB-co-MAA) nanospheres. The result indicates that hollow PS/P (DVB-co-MAA)@Fe3O4/TA@Ag nanocomposites are highly efficient in degrading dyes, displaying that the apparent rate coefficients of methylene blue (MB), rhodamine B (RhB) and 4-nitrophenol (4-NP) reduction are .0090 s(-1), 0.0239 s(-1), and 0.0073 s(-1), respectively. Besides, hollow PS/P(DVB-co-MAA)@Fe3O4/TA@Ag nanocomposites can be recycled at least seven times and show no significant loss in catalytic performance.
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