Journal
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
Volume 583, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.colsurfa.2019.123954
Keywords
Au nanoparticles; Supramolecular hydrogels; Cucurbit[8]uril; 4-Nitrophenol; Catalytic reduction
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Funding
- National Natural Science Foundation of China [21801199, 21871216]
- Thousand Youth Talents Program of China
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In this work, supramolecular hydrogels were utilised as soft reactor for gold nanoparticles (Au NPs) to prepare cucurbit[8]uril (CB[8]) based supramolecular hydrogel loaded with Au NP(Au/CB[8] hydrogel) catalysts. The morphology and structure of the catalysts were characterized via UV-vis spectroscopy, scanning electron microscopy, transmission electron microscopy, X-ray powderdiffraction and thermo gravimetric analyzer analysis. The Au/CB[8] hydrogels were utilised as catalysts and reaction media for the reduction reactions of 4-nitrophenol (4-NP) with NaBH4 aqueous. The reduction rate constants at four temperatures (16 degrees C, 25 degrees C, 34 degrees C and 43 degrees C) and the activation parameters were calculated. The activation energy of 4-NP was 65.83 kJ mol(-1). These types of hydrogel-composite catalyst systems exhibit self-healing and can be used repetitively up to seven times with 100% conversion and only 20% reduction in the initial reduction rate. This process provides a novel method for the production of highe fficiency and self-healing nanomaterals with various applications.
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