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- Title
Fabrication of thermosensitive hydrogel-supported Ni nanoparticles with tunable catalytic activity for 4-nitrophenol.
- Authors
Youzhi, Gao; Yang, He; Yiping, Zhao; Li, Chen; Fanyong, Yan
- Abstract
Thermosensitive hydrogels displaying a high degree of swelling were successfully fabricated from cross-linked poly( N-isopropylacrylamide- co-2-acrylamido-2-methylpropanesulfonic acid) (P(NIPAM- co-AMPS)). The sulfonic acid groups in the copolymer networks strongly modulated the internal structure and swelling behavior of the P(NIPAM- co-AMPS), thereby lowering the critical solution temperature of the hydrogels. These groups acted as adsorption sites, enabling the in situ synthesis of Ni nanoparticles in P(NIPAM- co-AMPS) hydrogels. Significant changes in the average diameter and number of the Ni nanoparticles were observed when the concentration of AMPS was changed. The catalytic capability of P(NIPAM- co-AMPS)/Ni to act as a switched temperature reactor was demonstrated in a model reduction reaction. Kinetic data revealed that the adsorption of the reactants on the catalyst surface was the key factor in terms of the Langmuir-Hinshelwood model. The reaction rate of the P(NIPAM-c o-AMPS)/Ni composite hydrogels did not increase monotonically; instead, the reaction rate decreased to some extent around the low critical solution temperature (LCST), demonstrating a thermally tunable catalytic activity. The P(NIPAM- co-AMPS)/Ni composites were also highly stable, and were usable after five cycles of use, retaining a high level of activity.
- Subjects
FABRICATION (Manufacturing); HYDROGELS; NICKEL compounds; NANOPARTICLES; NITROPHENOLS; CROSSLINKED polymers
- Publication
Journal of Materials Science, 2016, Vol 51, Issue 6, p3200
- ISSN
0022-2461
- Publication type
Article
- DOI
10.1007/s10853-015-9631-7