银纳米粒子
纤维素
纳米纤维素
复合数
4-硝基苯酚
化学工程
催化作用
硝酸银
材料科学
纳米颗粒
粒径
纳米复合材料
热稳定性
比表面积
化学
核化学
纳米技术
有机化学
复合材料
工程类
作者
Shaobo Zhang,Xueju Xu,Zi Ye,Yaxi Liu,Qingjun Wang,Qi Chen,Yong Jiang,Jinqiu Qi,Dong Tian,Jie Xu,Fengkai Wu,Xuanjun Feng,Yanli Lu
标识
DOI:10.1016/j.apsusc.2022.155192
摘要
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 cellulose. 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 structure, 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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