Preparation method of nano-TiO2-modified composite hydrogel

A composite hydrogel and nanotechnology, applied in chemical instruments and methods, alkali metal compounds, adsorbed water/sewage treatment, etc., can solve the problems of low adsorption efficiency and poor adsorption effect, and achieve the effect of improving stability

Active Publication Date: 2015-05-13
TIANXINFU (BEIJING) MEDICAL APPLIANCE CO LTD
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  • Summary
  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, this kind of composite hydrogel has the disadvantages of low adsorption efficiency and poor adsorption effect on the adsorption of dye wastewater.

Method used

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  • Preparation method of nano-TiO2-modified composite hydrogel

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preparation example Construction

[0025] A kind of nanometer TiO of the present invention 2 The preparation method of modified composite hydrogel specifically comprises the following steps:

[0026] Step 1: dissolving chitosan in an acetic acid solution with a mass concentration of 1% to 2%, the mass ratio of chitosan to acetic acid solution being 1:50 to 100, and magnetic stirring for 12 to 24 hours to obtain a chitosan solution;

[0027] Step 2: N’N-methylenebisacrylamide (BIS), nano-TiO 2 , N-isopropylacrylamide (NIPAAm) into the three-necked flask, N'N-methylenebisacrylamide (BIS), nano-TiO 2 , The mass ratio of N-isopropylacrylamide (NIPAAm) to chitosan is 2.5-3.5:0.23-0.36:2.3-3.6:1, nano-TiO 2 Anatase type is preferred, the particle size is preferably 10-30nm, mixed with the chitosan solution obtained in step 1, and ultrasonically dispersed for 10-20 minutes to obtain a mixed solution;

[0028] Step 3: Add initiator and tetramethylethylenediamine to the mixed solution obtained in step 2 under the pro...

Embodiment 1

[0032] Step 1: dissolving 1g of chitosan in 66g of acetic acid solution with a mass concentration of 1%, and magnetic stirring for 24 hours to obtain a chitosan solution;

[0033] Step 2: 2.8g N'N-methylenebisacrylamide (BIS), 0.3g nano-TiO with anatase average particle size of 20nm 2 , 3g N-isopropylacrylamide (NIPAAm) was added in the three-necked flask, and mixed with the chitosan solution obtained in step 1, and ultrasonically dispersed for 10min to obtain a mixed solution;

[0034] Step 3: Add 0.08 g of ammonium persulfate and 0.03 g of tetramethylethylenediamine to the mixed solution obtained in step 2 at room temperature and under the protection of nitrogen, stir for 1 h, and then freeze for 24 h to obtain nano-TiO 2 Modified composite hydrogel crude product;

[0035] Step 4: the nano-TiO obtained in step 3 2 The crude product of the modified composite hydrogel was soaked in deionized water for 24 hours, and the water was changed once every 4 hours. 2 Modified compos...

Embodiment 2

[0037] Step 1: dissolving 1g of chitosan in 50g of acetic acid solution with a mass concentration of 2%, and magnetic stirring for 12 hours to obtain a chitosan solution;

[0038] Step 2: 2.5g N'N-methylenebisacrylamide (BIS), 0.36g nano-TiO with anatase average particle size of 10nm 2, 2.3g N-isopropylacrylamide (NIPAAm) was added in a three-necked flask, and mixed with the chitosan solution obtained in step 1, and ultrasonically dispersed for 15min to obtain a mixed solution;

[0039] Step 3: At room temperature and under the protection of nitrogen, add 0.12 g potassium persulfate and 0.05 g tetramethylethylenediamine to the mixed solution obtained in step 2, stir and react for 0.5 h, then freeze and react for 18 h to obtain nano-TiO 2 Modified composite hydrogel crude product;

[0040] Step 4: the nano-TiO obtained in step 3 2 The crude product of the modified composite hydrogel was soaked in deionized water for 24 hours, and the water was changed once every 3 hours. Afte...

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Abstract

The invention discloses a preparation method of nano-TiO2-modified composite hydrogel. The method comprises steps as follows: dissolving chitosan in an acetic acid solution, mixing the solution with N'N-methylene bisacrylamide, nano-TiO2 and NIPAAm (N-isopropyl acrylamide) to obtain a mixed solution, adding an initiator and TMEDA (tetramethylethylenediamine) to the mixed solution to obtain a nano-TiO2-modified composite hydrogel coarse product after reactions, and performing post-treatment to obtain the nano-TiO2-modified composite hydrogel. The prepared nano-TiO2-modified composite hydrogel is used as a photocatalyst and an adsorbent to be applied to wastewater treatment. According to the preparation method of the nano-TiO2-modified composite hydrogel, the inorganic nano-material TiO2 is added, so that the stability of the chitosan hydrogel can be improved, the nano-TiO2-modified composite hydrogel can be used as the good photocatalyst and the good adsorbent to be applied to dye wastewater treatment, temperature-sensitive hydrogel can be separated from a reaction system quickly by the aid of the anti-phase conversion characteristic of PNIPAAm, and secondary pollution can be avoided.

Description

technical field [0001] The invention belongs to the technical field of hydrogel preparation, in particular to a nano-TiO 2 The preparation method of modified composite hydrogel, especially relates to a kind of nano TiO 2 The preparation method of the modified chitosan / poly N-isopropylacrylamide composite hydrogel. Background technique [0002] Chitosan (CS) has the advantages of wide sources, low price, non-toxicity, economy, good biocompatibility, degradability, and many groups can be modified. Therefore, chitosan can be used as a natural polymer adsorbent and is widely used. For the synthesis of smart hydrogels, it is widely used in printing and dyeing wastewater. However, the strength of single chitosan hydrogel is low, and the range of application is limited. The characteristic groups such as hydroxyl and amino groups in chitosan molecules can form hydrogen bonds and Westford bonds with other substances. The disadvantage of insufficient performance of the glue itself...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/28C08L33/26C08L5/08C08K3/22C08F220/54C08F222/38B01J31/38B01J20/26B01J20/28B01J20/30C02F1/28
Inventor 周建华王林本郝变芝崔艳娇
Owner TIANXINFU (BEIJING) MEDICAL APPLIANCE CO LTD
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