Ultrafast synthesis of gold nanoparticles on cellulose nanocrystals via microwave irradiation and their dyes-degradation catalytic activity

Madhusudhan Alle¹，Seung-Hwan Lee²，Jin-Chul Kim³

1. Institute of Forest Science, Kangwon National University2. Department of Forest Biomaterials Engineering, Kangwon National University3. Department of Medical Biomaterials Engineering, College of Biomedical Science and Institute of Bioscience and Biotechnology, Kangwon National University

摘 要：This study represents a well-dispersed gold nanoparticles（AuNPs） synthesis process via cellulose nanocrystals（CNC） which acts as both reducing and supporting agent. The synthesis process was ultrafast and completed in a few seconds using microwave irradiation. The entire synthesis process was cost-effective, sustainable and eco-friendly. The synthesized（AuNPs/CNC） nanocomposite was investigated by transmission electron microscopy, selected area electron diffraction, Fourier transform infrared spectroscopy, energy dispersive X-ray analysis, X-ray diffraction, and UV–vis spectroscopy. The obtained AuNPs were well accumulated on the CNC surface and had a uniform spherical shape with an average diameter of 8 ± 5.3 nm. The diameter of AuNPs could be altered by tuning the concentration of CNC suspension. The synthesized AuNPs/CNC nanocomposite film exhibited excellent degradation properties against various organic dyes, namely, Allura red, Congo red, Rhodamine B and Amaranth. The ultrafast degradation reactions followed pseudo first order kinetics. In the catalytic degradation reaction,AuNPs/CNC was transmitting electrons from a donor（NaBH₄） to an acceptor（a dye）.

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