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Method for in-situ preparation of titanium dioxide/cellulose nano-composite microspheres

A technology of cellulose microspheres and titanium dioxide, applied in chemical instruments and methods, oxidized water/sewage treatment, alkali metal oxides/hydroxides, etc., can solve difficult titanium dioxide/cellulose composite microspheres, reduce active sites , Reduce photocatalytic activity and other issues, achieve the effect of easy to master the preparation process, excellent photocatalytic performance, and low cost

Pending Publication Date: 2022-08-09
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The high surface energy of nanoparticles makes it difficult to obtain highly dispersed titanium dioxide / cellulose composite microspheres by traditional blending methods
Agglomerated nanoparticles in hydrogels are more likely to be embedded in the gel network structure, thereby greatly reducing the exposed active sites and reducing their photocatalytic activity

Method used

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  • Method for in-situ preparation of titanium dioxide/cellulose nano-composite microspheres
  • Method for in-situ preparation of titanium dioxide/cellulose nano-composite microspheres
  • Method for in-situ preparation of titanium dioxide/cellulose nano-composite microspheres

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A method for in-situ preparation of titanium dioxide / cellulose nanocomposite microspheres, the raw materials and reagents used are as follows:

[0037] Raw materials: virgin cellulose (cotton linters, degree of polymerization 500), n-butyl titanate Reagents: lithium hydroxide, urea, triethanolamine, Span 80, liquid paraffin, deionized water The preparation method adopts the following steps:

[0038] (1) Preparation of n-butyl titanate pre-hydrolysis solution: at room temperature, n-butyl titanate and triethanolamine were mixed in a molar ratio of 1:2, and deionized water was added dropwise to the mixture to obtain the final concentration of n-butyl titanate. Be 1.25mol / L, reaction obtains pre-hydrolyzate;

[0039](2) Preparation of gel prefabricated solution: Lithium hydroxide and urea are dissolved in deionized water, and then frozen. The dried 2.57g cellulose was added to the frozen 100g mixed solvent, and 5.0 mL of the n-butyl titanate prehydrolyzate obtained in ste...

Embodiment 2

[0041] A method for modifying titanium dioxide / cellulose nanocomposite microspheres prepared in situ, the raw materials and reagents used are as follows:

[0042] Raw material: Microspheres prepared in Example 1

[0043] Reagents: Rhodamine B, hydrogen peroxide, deionized water

[0044] The preparation method adopts the following steps:

[0045] (1) Preparation of Rhodamine B solution: Weigh a certain amount of Rhodamine B and dissolve it in deionized water, and set the volume for use;

[0046] (2) Rhodamine B degradation intermediate modified microspheres: The microspheres in Example 1 were added to the Rhodamine B solution, and a certain amount of hydrogen peroxide was added to degrade Rhodamine B under light conditions. When the solution was colorless and transparent, the modified microspheres were obtained by sedimentation separation.

Embodiment 3～20

[0047] Embodiments 3 to 20 are shown in Table 1:

[0048] Table 1. Preparation conditions of Examples 3-20

[0049]

[0050] Table 2 Example 3-20 Size, Titanium Dioxide Load, Adsorption, Degradation Performance Comparison Table

[0051]

[0052]

[0053] *Degradation time is 70 minutes.

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Abstract

The invention relates to a method for preparing titanium dioxide / cellulose nano composite microspheres in situ, which comprises the following steps: adding a pre-hydrolyzed tetrabutyl titanate solution into a cellulose solution to obtain a pre-prepared solution, and preparing nano composite cellulose microspheres of in-situ mineralized amorphous titanium dioxide by an inverse emulsion method. The amorphous titanium dioxide prepared by the method can expose more active sites, and the adsorption performance of the amorphous titanium dioxide is far higher than that of microspheres prepared by a traditional blending method. The composite microsphere shows the characteristic of accelerated degradation efficiency in the degradation process of rhodamine B. The matrix is wide in source, green and environment-friendly, the solvent system is non-toxic and cheap, the material preparation process is simple, the process is easy to master, the production cost is low, and the huge potential of large-scale production is achieved.

Description

technical field [0001] The invention relates to the technical field of preparation of nano-composite gel microspheres applied to water treatment, in particular to a preparation method of a composite catalyst capable of in-situ preparation, high adsorption, easy sensitization and efficient degradation of water pollutants. Background technique [0002] Photocatalytic technology converts light energy into chemical energy through semiconductor nanomaterials, and the generated free radicals can efficiently degrade pollutants in mineralized water, so it is widely used in wastewater treatment. Among many photocatalysts, titanium dioxide has received extensive attention in both academic research and practical applications due to its abundant reserves, low cost, and easy preparation. However, efficient photocatalytic reactions require that the carriers generated by semiconductor materials under illumination can effectively reach the catalyst surface. This requires the size of the ca...

Claims

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Application Information

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IPC IPC(8): B01J31/38B01J35/08B01J20/24B01J20/28B01J20/30C02F1/28C02F1/30C02F1/72C02F101/30C02F101/34C02F101/36C02F101/38
CPCB01J31/38B01J20/24B01J20/06B01J20/28019B01J20/28047C02F1/30C02F1/722C02F1/725C02F1/288C02F2305/10C02F2101/308C02F2101/34C02F2101/36C02F2101/38B01J35/23B01J35/51B01J35/39Y02W10/37
Inventor 黄华东朱锦龙李忠明钟淦基
Owner SICHUAN UNIV
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