Journal
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
Volume 633, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.colsurfa.2021.127860
Keywords
MXene; Polydopamine; Au; Photothermal; Nanocatalysts
Categories
Funding
- National Natural Science Foundation of China [11822209, 12072338, 61804069, 61774084]
- Fundamental Research Funds for the Central Universities [PA2020GDKC0005, WK2480000007]
- Practice Innovation Training Program for the Jiangsu Undergraduate Students [202013573066Y]
- Opening Project of Nanjing Key Laboratory of Optometric Materials and Application Technology [JIT2018-1]
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A sandwich-structured MXene@Au/Polydopamine nanosheet with good hydrophilicity, large specific surface area, and tri-photothermal components has been developed for nanocatalysis, demonstrating enhanced catalytic activity in reducing 4-nitrophenol. The PDA shell provides effective protection, allowing the nanosheets to maintain over 90% activity after 10 cycles of reaction. This work provides insights into the use of NIR light to improve the catalytic activity of noble metal nanocatalysts and offers a simple synthetic model for heterogeneous catalysts based on MXene nanocomposites.
Local surface plasmon resonance (LSPR) of noble metal nanoparticles plays a significant role in nanocatalysis via directly harvesting optical energy from resonant light. However, the photothermally-assistant catalytic application is limited due to the narrow visible/infrared absorption range and low photothermal conversion efficiency. Herein, a sandwich-structured MXene@Au/Polydopamine (PDA) nanosheet with good hydrophilicity, large specific surface area and tri-photothermal components is developed for nanocatalysis. The Au/PDA hybrid shells are covered on the MXene nanosheets via a simple one-step redox-oxidize polymerization method. As a result, the catalytic dynamic of MXene@Au/PDA nanosheets on reducing 4-nitrophenol reaches to 0.28 min(-1).mg(-1), which is about 2 times larger than that of the nanocatalysts without NIR light irradiation. Owing to the well protection of PDA shell, after 10 cycles of reduction of 4-nitrophenol, MXene@Au/PDA nanosheets still maintain more than 90% activity. This work in depth insights into NIR light-assistant avenue to enhance the catalytic activity of noble metal nanocatalysts and highlights an easy synthetic model for heterogeneous catalysts based on MXene nanocomposites.
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