A method for determining the carboxyl content of nanocellulose by multi-wavelength spectroscopy

A kind of nanocellulose and spectroscopic technology, which is applied in the field of multi-wavelength spectroscopic technology to determine the carboxyl group content of nanocellulose, can solve problems such as impossible component content, and achieve the effects of simple and fast experimental operation and objective and accurate test results.

Active Publication Date: 2021-07-20
SOUTH CHINA UNIV OF TECH
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Problems solved by technology

However, unlike the above samples, nanocellulose is completely water-soluble, and its complex of carboxylic acid groups and methylene blue (RCOOMB) is also water-soluble, while the spectrum of methylene blue itself and the carboxylic acid groups on nanocellulose and methylene blue The spectra of complexes are mostly overlapping, so it is not possible to quantify the absorbing individual components to determine the amount of components in the actual mixture

Method used

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  • A method for determining the carboxyl content of nanocellulose by multi-wavelength spectroscopy
  • A method for determining the carboxyl content of nanocellulose by multi-wavelength spectroscopy
  • A method for determining the carboxyl content of nanocellulose by multi-wavelength spectroscopy

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Embodiment 1

[0041] This embodiment measures the carboxyl content of nanocellulose prepared under different oxidation processes, and the specific determination steps are as follows:

[0042] (1) Using deionized water as a blank, scan the full spectrum with an ultraviolet-visible spectrophotometer (UV-Vis), and correct the absorbance at 0 point.

[0043] (2) After mixing 5 mL of MB aqueous solution with a concentration of 31.3 μmol / L and 5 mL of deionized water, the pure spectrum of methylene blue was obtained by UV-Vis scanning①.

[0044] (3) After mixing the nanocellulose aqueous solution with a concentration of 3 mg / L and an equal volume of deionized water, scan its full spectrum with UV-Vis to obtain the spectrogram of the nanocellulose aqueous solution ②;

[0045] (4) After mixing the MB aqueous solution with a volume of 5mL and a concentration of 31.3μmol / L and the aqueous solution of nanocellulose with a volume of 5mL and a concentration of 168mg / L, after UV-Vis scanning, the carboxyl ...

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Abstract

The invention discloses a method for measuring the carboxyl content of nano cellulose by multi-wavelength spectroscopic technology. Using methylene blue as the chromogenic agent and the carboxyl group of nanocellulose to form RCOOMB association through ion exchange reaction, combined with multivariate numerical analysis technology to overcome the spectrum of methylene blue and the generated association RCOOMB spectrum in the wavelength range of 500-750nm. overlapping issues. The results show that, compared with the reference method, the method of the invention has better measurement precision and accuracy. Therefore, the method of the present invention is simple and fast, and is suitable for the determination of carboxyl content in nanocellulose.

Description

technical field [0001] The invention belongs to the technical field of analysis and detection, and in particular relates to a method for measuring the carboxyl content of nanocellulose by multi-wavelength spectroscopy. Background technique [0002] Nanocellulose (nanocelluloses) refers to cellulose functional materials with a size of 1-100 nm in at least one dimension. In addition to having a wide range of natural cellulose sources, degradable regeneration and environmental friendliness, nanocellulose also has unique advantages such as high specific surface area, high strength, high Young's modulus and high transparency. Therefore, it is widely used in cosmetics, coatings, biological It has broad application prospects in medicine, energy electronics and other industries. In the preparation process of nanocellulose, chemical methods are used, such as: TEMPO (2,2,6,6-tetramethylpiperidine-1-oxyl radical)-NaBr-NaClO oxidation, persulfate oxidative degradation, high The iodate...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/31G01N21/33
CPCG01N21/31G01N21/33G01N2021/3129
Inventor 闫宁柴欣生
Owner SOUTH CHINA UNIV OF TECH
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