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Honeycomb-shaped TiO2 porous microsphere using microporous starch as template and preparation method thereof

A technology of microporous starch and porous microspheres, which is applied in the direction of microsphere preparation, microcapsule preparations, chemical instruments and methods, etc., can solve the problems of unfriendly environment and high cost, and achieve reduction of agglomeration, convenient recycling, catalytic high efficiency effect

Active Publication Date: 2018-05-04
SOUTH CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, existing TiO 2 Most of the preparation methods of hollow microspheres use organic substances as templates, which require the use of a large amount of organic solvents and the removal of templates, and high-temperature calcination will release a large amount of organic gas when the template is removed, which is not friendly to the environment, and the cost is high

Method used

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  • Honeycomb-shaped TiO2 porous microsphere using microporous starch as template and preparation method thereof
  • Honeycomb-shaped TiO2 porous microsphere using microporous starch as template and preparation method thereof
  • Honeycomb-shaped TiO2 porous microsphere using microporous starch as template and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] Example 1 A honeycomb TiO with microporous starch as template 2 porous microsphere

[0069] 1. Preparation method

[0070] (1) Weigh 75 g of cornstarch, add citric acid-sodium citrate buffer solution with a pH of 4.5, stir continuously with a magnetic stirrer, and prepare a cornstarch suspension with a concentration of 150 g / L;

[0071] (2) Add 4 g / L α-amylase and glucoamylase (α-amylase: glucoamylase = 3.2:1) to the cornstarch suspension in step (1), and place in a water bath at 55°C Stir and react in a pot for 9 h, filter the reaction solution and wash with distilled water for 3 times, dry the precipitate in an oven at 50°C, crush it and pass it through a 80-mesh sieve to obtain microporous starch;

[0072] (3) Weigh 1.5 g of P25 powder (commercial nano-TiO 2 ) into 500 mL of distilled water, adding 0.75% polyvinylpyrrolidone (based on P25 mass percent) as a dispersant, magnetic stirring for 30 min, and ultrasonic dispersion for 30 min to obtain nano-TiO 2 dispers...

Embodiment 2

[0077] Example 2 A honeycomb TiO with microporous starch as template 2 porous microsphere

[0078] 1. Preparation method

[0079] (1) Weigh 50 g of cornstarch, add citric acid-sodium citrate buffer solution with a pH of 4.5, stir continuously with a magnetic stirrer, and prepare a cornstarch suspension with a concentration of 100 g / L;

[0080](2) Add 3 g / L α-amylase and glucoamylase (α-amylase: glucoamylase = 2:1) to the cornstarch suspension in step (1), and place in a water bath at 50°C Stir and react in a pot for 9 h, filter the reaction solution and wash with distilled water for 3 times, dry the precipitate in an oven at 50°C, crush it and pass it through a 80-mesh sieve to obtain microporous starch;

[0081] (3) Weigh 1.5 g of P25 powder and dissolve it into 500 mL of distilled water, add 0.5% polyvinylpyrrolidone (based on the mass percentage of P25) as a dispersant, stir magnetically for 30 min, and disperse ultrasonically for 30 min to obtain nano-TiO 2 dispersion e...

Embodiment 3

[0086] Example 3 A honeycomb TiO with microporous starch as template 2 porous microsphere

[0087] 1. Preparation method

[0088] (1) Weigh 25 g of cornstarch, add citric acid-sodium citrate buffer solution with a pH of 4, stir continuously with a magnetic stirrer, and prepare a cornstarch suspension with a concentration of 100 g / L;

[0089] (2) Add 1 g / L α-amylase and glucoamylase (α-amylase: glucoamylase = 1:1) to the cornstarch suspension in step (1), and place in a water bath at 50°C Stir and react in a pot for 6 hours, filter the reaction solution and wash with distilled water for 3 times, dry the precipitate in an oven at 50°C, crush it and pass it through a 80-mesh sieve to obtain microporous starch;

[0090] (3) Weigh 1 g of P25 powder and dissolve it into 500 mL of distilled water, add 0.5% polyvinylpyrrolidone (based on the mass percentage of P25) as a dispersant, stir magnetically for 30 min, and disperse ultrasonically for 30 min to obtain nano-TiO 2 dispersion ...

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Abstract

The invention discloses a honeycomb-shaped TiO2 porous microsphere using microporous starch as a template and a preparation method thereof. According to the method, starch is hydrolyzed by bio-enzymeto obtain the microporous starch; dispersing agents and bonding agents are added into nanometer TiO2 to obtain nanometer TiO2 emulsion; the microporous starch and the nanometer TiO2 emulsion are mixed; centrifugation is performed; precipitates are dried and ground to obtain the honeycomb-shaped TiO2 porous microsphere. The TiO2 is directly loaded onto the microporous starch; the adsorption performance of the microporous starch is used for preparing the microporous microsphere; the prepared TiO2 porous microsphere has high specific surface area, high specific pore volume and good adsorption performance; the unique advantage of improving the light capturing efficiency and photocatalytic performance is realized; the template removal treatment is not needed; the honeycomb-shaped TiO2 porous microsphere can be directly used as a photocatalyst; the catalysis efficiency is high; the preparation process conditions are mild; the production period is short; the raw materials are cheap and can beeasily obtained; the environment-friendly effects are achieved; wide application prospects are realized in an aspect of organic pollution degradation through photocatalysis.

Description

technical field [0001] The invention belongs to the technical field of semiconductor photocatalytic materials. More specifically, it relates to a cellular TiO 2 Porous microspheres and methods for their preparation. Background technique [0002] Nano-TiO 2 As an N-type semiconductor photocatalytic material, when irradiated by ultraviolet light, the electrons in the valence band absorb the energy of photons and jump to the conduction band to form photogenerated electron-hole pairs, and the electrons and TiO 2 Oxygen molecules adsorbed on the surface react to generate superoxide ion radicals ( ), while holes will be adsorbed on TiO 2 Surface The ions react to form highly reactive hydroxyl radicals ( ). and They are active free radicals with strong oxidizing properties, which can directly oxidize various organic compounds into CO 2 , H 2 O and other small molecules. Given nano-TiO 2 Due to its strong oxidizing properties, good photocatalytic properties and phot...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/38B01J35/08B01J20/24B01J20/28B01J20/30B01J13/02
CPCB01J13/02B01J20/06B01J20/24B01J20/28021B01J31/38B01J35/40B01J35/51
Inventor 宋贤良吕宁刘秀果叶盛英王海丹
Owner SOUTH CHINA AGRI UNIV
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