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<p>Carboxycellulose nanocrystals (CNCs-COOH) have great potential for applications in areas such as food packaging and pharmaceuticals. In this paper, a modified potassium permanganate (KMnO<sub>4</sub>) oxidation method was developed, in which disodium dihydrogen pyrophosphate (Na<sub>2</sub>H<sub>2</sub>P<sub>2</sub>O<sub>7</sub>) was introduced into the potassium permanganate, and Na<sub>2</sub>H<sub>2</sub>P<sub>2</sub>O<sub>7</sub> was able to complex with Mn<sup>3+</sup> to form [Mn(H<sub>2</sub>P<sub>2</sub>O<sub>7</sub>)<sup>2−</sup>]<sup>+</sup>, which prevented Mn<sup>3+</sup> from being reduced, and the oxidative ability of the system was significantly improved, so that the CNCs-COOH was obtained with a high yield, a high crystallinity, and a higher content of carboxylic acid in a mild condition. The effect of Na<sub>2</sub>H<sub>2</sub>P<sub>2</sub>O<sub>7</sub> on the microstructure, chemical and thermal properties of CNCs-COOH was analysed by X-ray diffraction (XRD), transmission electron microscopy (TEM), Fourier transform infrared (FT-IR) spectroscopy, thermogravimetric (TGA) and zeta potential. The results showed that the introduction of Na<sub>2</sub>H<sub>2</sub>P<sub>2</sub>O<sub>7</sub> could accelerate the extraction of CNCs-COOH. The preparation method has the advantages of rapidity and high efficiency, which provides a feasible way for the industrial preparation of CNCs-COOH.</p>

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Facile synthesis of carboxylated cellulose nanocrystals via a modified potassium permanganate oxidation method

  • 期刊论文

  • 发表日期：

    2025年10月27日

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  • Jianfeng Yan,
  • Rongrong Han,
  • Yijing Li,
  • Houshen Li,
  • Yanguang Song,
  • Jilian Yu,
  • Junling Duan,
  • Shiyun Ai

摘要

Carboxycellulose nanocrystals (CNCs-COOH) have great potential for applications in areas such as food packaging and pharmaceuticals. In this paper, a modified potassium permanganate (KMnO4) oxidation method was developed, in which disodium dihydrogen pyrophosphate (Na2H2P2O7) was introduced into the potassium permanganate, and Na2H2P2O7 was able to complex with Mn3+ to form [Mn(H2P2O7)2−]+, which prevented Mn3+ from being reduced, and the oxidative ability of the system was significantly improved, so that the CNCs-COOH was obtained with a high yield, a high crystallinity, and a higher content of carboxylic acid in a mild condition. The effect of Na2H2P2O7 on the microstructure, chemical and thermal properties of CNCs-COOH was analysed by X-ray diffraction (XRD), transmission electron microscopy (TEM), Fourier transform infrared (FT-IR) spectroscopy, thermogravimetric (TGA) and zeta potential. The results showed that the introduction of Na2H2P2O7 could accelerate the extraction of CNCs-COOH. The preparation method has the advantages of rapidity and high efficiency, which provides a feasible way for the industrial preparation of CNCs-COOH.