am7b14807_si_001.pdf (2.49 MB)
Preparation of a Sulfur-Functionalized Microporous Polymer Sponge and In Situ Growth of Silver Nanoparticles: A Compressible Monolithic Catalyst
journal contribution
posted on 2017-10-10, 00:00 authored by Jong Gil Kim, Min Chul Cha, Jeongmin Lee, Taejin Choi, Ji Young ChangWe report a compressible
monolithic catalyst based on a microporous organic polymer (MOP) sponge.
The monolithic MOP sponge was synthesized via Sonogashira-Hagihara
coupling reaction between 1,4-diiodotetrafluorobenzene and 1,3,5-triethynylbenzene
in a cosolvent of toluene and TEA (2:1, v/v) without stirring. The
MOP sponge had an intriguing microstructure, where tubular polymer
fibers having a diameter of hundreds of nanometers were entangled.
It showed hierarchical porosity with a Brunauer–Emmett–Teller
(BET) surface area of 512 m2 g–1. The
MOP sponge was functionalized with sulfur groups by the thiol–yne
reaction. The functionalized MOP sponge exhibited a higher BET surface
area than the MOP sponge by 13% due to the increase in the total pore
and micropore volumes. A MOP sponge-Ag heterogeneous catalyst (S-MOPS-Ag)
was prepared by in situ growth of silver nanoparticles inside the
sulfur-functionalized MOP sponge by the reduction of Ag+ ions. The catalytic activity of S-MOPS-Ag was investigated for the
reduction reaction of 4-nitrophenol in an aqueous condition. When
S-MOPS-Ag was compressed and released during the reaction, the rate
of the reaction was considerably increased. S-MOPS-Ag was easily removed
from the reaction mixture owing to its monolithic character and was
reused after washing and drying.