Preparation method of high activity oxidized nanocrystalline cellulose based titanium dioxide

A nanocrystalline cellulose and titanium dioxide-based technology, which is applied in the direction of titanium dioxide, titanium oxide/hydroxide, etc., can solve the problem of improving the catalytic activity of nano-titanium dioxide products, cellulose whose size is nano-scale, and unresolved problems. Involves issues such as the preparation of nano-titanium dioxide particles, achieving high safety and biodegradability, reducing adverse effects, and reducing application costs

Active Publication Date: 2016-01-13
ZHEJIANG JINCHANG SPECIALTY PAPER CO LTD
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  • Application Information

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Problems solved by technology

[0010] In the above invention patents 1-4, there is no mention of the use of nanoscale cellulose in the preparation of titanium dioxide composites, while invention patents 5-6 use nanofibers or nanocrystalline cellulose, but invention patent 5 does not It does not involve the preparation of nano-titanium dioxide particles with special forms, and the invention patent 6 does not use high-temperature calcination steps, and its prepared products are square or needle-shaped
In addition,

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  • Preparation method of high activity oxidized nanocrystalline cellulose based titanium dioxide

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Embodiment 1

[0049] A preparation method of highly active oxidized nanocrystalline cellulose-based titanium dioxide, which adopts the preparation method of homogeneous sol and high-temperature calcination method. active agent, or no surfactant is added to the mixed solution, the precursor of which is n-butyl titanate, the substrate is oxidized nanocrystalline cellulose rich in dialdehyde groups, and the auxiliary materials include inorganic salts Thickener, and anionic surfactant and supplemented with an appropriate amount of amphoteric surfactant or nonionic surfactant, the morphology of the prepared titanium dioxide crystal particles is wheat ear-shaped, highly active nano-sized solid particles, in water It has good dispersion and can effectively improve its treatment efficiency for pigments in wastewater. The operation process of its preparation steps is:

[0050] 1) Prepare the organic solvent solution A of the precursor n-butyl titanate, selectively add thickeners and surfactants to t...

Embodiment 2

[0070] A preparation method of highly active oxidized nanocrystalline cellulose-based titanium dioxide, the preparation process steps of which are the same as in Example 1, except that the selected organic solvent is isopropanol and the selected thickener is potassium chloride, and Do not add amphoteric surfactant in the mixed solution, and its preparation step operation process is:

[0071] One), prepare the organic solvent solution A of the precursor n-butyl titanate, selectively add thickener and surfactant in the solution

[0072] Take 5g of n-butyl titanate precursor and add it to isopropanol, the mass ratio of n-butyl titanate to isopropanol is 1:6.5, add 0.2g potassium chloride thickener, 0.35g fatty alcohol polyoxyethylene Sodium ether sulfate anionic surfactant and 0.15g coconut oil monoethanolamide nonionic surfactant were added to the mixed solution respectively, hydrochloric acid was added to adjust the pH to 3, and the organic solvent solution A of the precursor w...

Embodiment 3

[0083] A method for preparing highly active oxidized nanocrystalline cellulose-based titanium dioxide, the preparation process steps of which are the same as in Example 1, except that: the selected organic solvent is isopropanol and the selected thickener is ammonium chloride. Its preparation step operation process is:

[0084] One), prepare the organic solvent solution A of the precursor n-butyl titanate, selectively add thickener and surfactant in the solution

[0085] Take 6g of n-butyl titanate precursor and add it to isopropanol, the mass ratio of n-butyl titanate to isopropanol is 1:5.5, add 0.5g ammonium chloride thickener, 0.3g lauryl sulfate Sodium anionic surfactant and 0.15g ethylene glycol distearate nonionic surfactant were added to the mixed solution respectively, hydrochloric acid was added to adjust the pH to 3.5, and the organic solvent solution of the precursor was prepared by processing with a low-speed shearing machine for 28 minutes A, the speed control o...

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Abstract

The invention discloses a preparation method of nano titanium dioxide with a high catalytic activity. The preparation method comprises the following steps: preparing raw materials: a butyl titanate precursor and diformyl nanocrystalline cellulose, which is obtained through an oxidization treatment; optionally adding a thickening agent and a surfactant, preparing a butyl titanate solution and a diformyl nanocrystalline cellulose solution, mixing two solutions under high speed sheering to obtain a uniform mixture, and subjecting the mixture to a gelation and high temperature calcination treatment to obtain the target product. According to the preparation method, oxidized nanocrystalline cellulose rich in diformyl groups is taken as the basic material, and under the effects of auxiliary materials such as thickening agent, surfactant, and the like, during the process of hydrothermal-freeze drying and gradient-heating calcination, the n-butyl titanate precursor is induced to carry out crystallization so as to form wheat-ear-shaped nano titanium dioxide crystal particles. The crystal particles can be well dispersed in water, thus the efficiency on processing the pigments in wastewater is effectively improved, and the provided titanium dioxide can degrade more than 98.5% of methyl orange within 12 minutes, in the best case.

Description

technical field [0001] The invention relates to a preparation method of nanometer titanium dioxide, in particular to a preparation method of highly active oxidized nanocrystalline cellulose-based titanium dioxide, and belongs to the technical field of preparation of inorganic non-metallic nanomaterials. Background technique [0002] In recent years, as the world's environmental problems have become increasingly serious, photocatalysis has become an important means of degrading environmental pollutants. Titanium dioxide has been widely used in the field of photocatalysis due to its advantages of low price, non-toxicity and good stability. In the early studies, most of the suspension systems were composed of titanium dioxide powder and wastewater, but the suspension system often had disadvantages such as easy agglomeration of solid particles and poor catalyst efficiency. The catalyst has a low probability of collision with the target molecule. Therefore, how to prepare a tit...

Claims

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Application Information

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IPC IPC(8): C01G23/08
CPCC01G23/08C01P2004/04
Inventor 孙波张民司传领刘锐吴涛倪永浩
Owner ZHEJIANG JINCHANG SPECIALTY PAPER CO LTD
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