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Method for preparing nanocrystals by oxidizing low-valence iodide or iodate

A nanocrystal and iodide technology is applied in the field of low-valent iodide or iodate oxidation to prepare nanocrystals, which can solve the problems of restricting application and development, poisoning, environmental pollution, etc., and achieves reduction of production cost, low price, and mild reaction. Effect

Pending Publication Date: 2021-07-23
刘文见
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, natural nanocrystals are often prepared by separating and preparing nanocellulose by chemical, physical, and biological methods. However, the existing natural nanocrystals need to use a large amount of acid, alkali, and toxic chemical oxidants during the preparation process. A large amount of waste acid liquid, waste alkali liquid and toxic waste liquid will also be produced, and there is an environmental pollution problem. On the other hand, a large amount of energy input is also required in the preparation process of natural nanocrystals. Therefore, the existing natural nanocrystals The toxicity of the preparation method restricts its large-scale application and development

Method used

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  • Method for preparing nanocrystals by oxidizing low-valence iodide or iodate
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  • Method for preparing nanocrystals by oxidizing low-valence iodide or iodate

Examples

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Embodiment 1

[0026] A method for preparing nanocrystals by oxidation of low-valent iodide or iodate, specifically comprising the steps of:

[0027] (1) Prepare the reaction solution: dissolve 1 g of potassium iodate into 150 mL of deionized water, and adjust the solution to pH>7 with alkali:

[0028] (2) Add the prepared reaction solution into the electrochemical anode cell, and apply a voltage of 0.7V between the cathode and anode to carry out oxidation treatment for 3 days to form IO 3 - oxidation products;

[0029] (3) Add lignocellulose to the reaction solution treated by electrochemical oxidation, and stir for 15 days under the condition of avoiding light and normal temperature for continuous oxidation treatment, stop the reaction and obtain the solid in the reaction solution by filtration or centrifugation, and pass the solid through Nanocrystals or nanofibers are obtained after purification; under alkaline and oxidizing conditions, the oxidation product IO 3 - The added lignocel...

Embodiment 2

[0031] A method for preparing nanocrystals by oxidation of low-valent iodide or iodate, specifically comprising the steps of:

[0032] (1) Prepare the reaction solution: Dissolve 7g of potassium iodate in 150mL of deionized water, and adjust the solution to pH>7 with alkali:

[0033] (2) Add the prepared reaction solution into the electrochemical anode cell, and apply a voltage of 3V between the anode and cathode to carry out oxidation treatment for 2 days to form IO 3 - oxidation products;

[0034] (3) Add lignocellulose to the reaction solution treated by electrochemical oxidation, and stir for 30 days under the condition of dark and normal temperature for continuous oxidation treatment, stop the reaction and obtain the solid in the reaction solution by filtration or centrifugation, and pass the solid through Nanocrystals or nanofibers are obtained after purification; under alkaline and oxidizing conditions, the oxidation product IO 3 - The added lignocellulose is select...

Embodiment 3

[0036] A method for preparing nanocrystals by oxidation of low-valent iodide or iodate, specifically comprising the steps of:

[0037] (1) Prepare the reaction solution: dissolve 28g of potassium iodate into 150mL of deionized water, and adjust the solution to pH>7 with alkali:

[0038] (2) Add the prepared reaction solution into the electrochemical anode cell, apply a voltage of 2V between the cathode and anode for oxidation treatment, add lignocellulose while adding the reaction solution, and stir for 30 days under the condition of dark and normal temperature for continuous oxidation The reaction makes the oxidation of the reaction liquid and the oxidation of lignocellulose proceed simultaneously. After the reaction is stopped, the solid in the reaction liquid is obtained by filtration or centrifugation, and the solid is purified to obtain nanocrystals or nanofibers; under alkaline and oxidative conditions, The resulting oxidation product IO 3 - At the same time, the added...

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Abstract

The invention relates to a method for preparing nanocrystals by oxidizing low-valence iodide or iodate, which is characterized by specifically comprising the following steps: (1) preparing a reaction solution, namely dissolving 1-28g of potassium iodate or iodide into 150mL of deionized water, adjusting the pH value of the solution to be greater than 7 by using alkali, adding reaction raw materials into the pH-adjusted solution, and uniformly stirring to prepare a reaction solution; (2) carrying out oxidation treatment on the reaction solution, continuously stirring for 1-30 days under a dark normal-temperature condition, then stopping the reaction to obtain a solid in the reaction solution, and purifying the solid to obtain the nanocrystals; in the whole preparation process, the reaction is mild, and generation of toxic and harmful products is avoided.

Description

technical field [0001] The invention relates to a method for preparing nano crystals by oxidation of low-valent iodide or iodate, belonging to the technical field of biomass resource utilization. Background technique [0002] Nanocrystalline materials refer to crystalline materials with at least one dimension in the nanometer scale in the three-dimensional space scale, and their grain size is about 1-250nm. A notable feature of this material is that most of its atoms are in the grain boundary area. Unique structural features make nanocrystals a new material that is different from ordinary polycrystalline and amorphous solids. [0003] Nanocrystalline materials are divided into single-phase or multi-phase single-crystal or multi-crystalline materials. In a single crystal material, any region has the same crystal lattice direction, while a polycrystalline material is composed of many regions or grains with different lattice directions, and the grains are separated by grain bo...

Claims

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Application Information

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IPC IPC(8): C08B15/02D01F2/24C08B37/08D01F9/00C08H1/06D01F4/00B82Y40/00
CPCC08B15/02D01F2/24C08B37/003D01F9/00C08H1/06D01F4/00B82Y40/00
Inventor 刘文见
Owner 刘文见
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