期刊
APPLIED SURFACE SCIENCE
卷 608, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apsusc.2022.155192
关键词
Cellulose; silver composite; Surface support; Spherical nanocellulose; Silver nanoparticle; Catalytic properties; Antibacterial activity
The SNC-AgNPs exhibited high antibacterial activity and excellent catalytic properties, with a high preparation efficiency and thermal stability.
A well-designed spherical-nanocellulose (SNC)/silver-nanoparticle (AgNP) composite (SNC-AgNP) with a novel structure, a conjugate of large nanospheres (SNC, mean particle size 41 +/- 9.7 nm) and small nanospheres (AgNPs, mean particle size 12 +/- 6.3 nm), was prepared by the reduction of silver nitrate on plant-derived cel-lulose. The large nanospheres not only acted as a reducing agent, but more importantly, as a unique nano -spherical surface support, resulting in good dispersion of the small nanospheres. Thanks to this novel struc-ture, the SNC-AgNPs possessed high antibacterial activity against the model microbes E. coli and S. aureus, and excellent catalytic properties for the degradation of p-nitrophenol. Notably, the catalytic rate constant (kapp = 1.6024 +/- 0.0265 min-1) and catalytic activity factor (k = 5287.8 +/- 644 min-1 g-1) of the SNC-AgNPs surpassed those of all cellulose-based Ag catalysts and most non-cellulose-based Ag catalysts. Moreover, the preparation of the SNC-AgNPs was high efficient, due to the high surface hydroxyl density of the SNC contributed from the cellulose II crystal structure, nano-spherical morphology, and low polymerization degree. Additionally, the thermal stability of the SNC-AgNPs was higher than most cellulose/Ag composite.
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