10 of 11
PASHAEI AND MEHDIPOUR
the hydrogenation reaction of nitrobenzene with NaBH4
for five consecutive cycles under the same reaction
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4
2
5 min) was used. After each run, the catalyst was recov-
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2
2
was dried under vacuum after each cycle and then reused
for the next reaction. It was observed that the IT‐MHAp‐
Ag showed excellent activity and reusability for the hydro-
genation reaction even after five runs in aqueous medium
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(the reduction of nitrobenzene could still reach 90% after
five cycles). These results indicated that insignificant Ag
leaching occurred during the reaction and the yield
increased slightly when the nanocatalyst was removed
from the reaction medium. In addition, atomic absorption
spectrophotometry for Ag determination performed on
the residual liquid phase after reaction (without
nanocatalyst) indicated that a negligible amount of Ag
NPs was released from the surface of the organic–
inorganic nanocatalyst (about 1 ppm).
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[
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4
| CONCLUSIONS
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IT‐MHAp‐Ag was developed as a magnetic heterogeneous
catalyst, for the hydrogenation reaction of nitroarenes in
aqueous media. The use of the IT‐MHAp‐Ag nanocatalyst
as a mesoporous ionic‐tagged catalyst provided a simple
and green catalytic protocol for the efficient synthesis of
organic aminoarenes. No decrease in the performance of
the catalyst was observed within five successive reaction
runs. In addition to the simple preparation of the catalyst
from available and inexpensive starting materials, its
recovery can easily be accomplished using a simple
external magnet, thus making it appealing for industrial
applications.
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This work was supported by the Research Council at the
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