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Method for preparing photocatalyst by using nanocrystalline cellulose template

A technology of nanocrystalline cellulose and photocatalyst, which is applied in chemical instruments and methods, catalyst activation/preparation, physical/chemical process catalyst, etc., can solve the problem of low photocatalytic efficiency and achieve the effect of high dispersion

Inactive Publication Date: 2018-05-18
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still deficiencies in the two documents: (1) the use of photocatalysts is limited - they are used in the reduction of aldehydes in wood-based panels and water-based polyacrylic acid coatings; (2) the photocatalytic efficiency is not high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] (1) Take nanocrystalline cellulose and deionized water according to a mass ratio of 2:100, fully mix them, and carry out ultrasonic dispersion in an ice-water bath to obtain a nanocrystalline cellulose colloid with a mass fraction of 2%;

[0016] (2) Weigh the nanocrystalline cellulose colloid, zinc acetate, silver nitrate, and dehydrated alcohol in step (1) according to the mass ratio of 100:8:0.25:1200, and add the nanocrystalline cellulose colloid and zinc acetate to the In water and ethanol, ultrasonically disperse evenly, then add silver nitrate, ultrasonically disperse evenly, adjust the pH value of the system to 7 with 0.5mol / L sodium hydroxide, raise the temperature to 70-80°C, react for 2 hours, and then add boron to the mixed solution Sodium hydride (the mass ratio of sodium borohydride is 6% of silver nitrate), continue to react for 2 to 3 hours to obtain a composite; place the composite at 110 to 130°C for 0.5 to 1 hour to obtain a white NCC / ZnO / Ag composite ...

Embodiment 2

[0022] (1) Take nanocrystalline cellulose and deionized water according to a mass ratio of 1.5:100, fully mix them, and carry out ultrasonic dispersion in an ice-water bath to obtain a nanocrystalline cellulose colloid with a mass fraction of 1.5%;

[0023] (2) Weigh the nanocrystalline cellulose colloid, zinc acetate, silver nitrate, and dehydrated alcohol in step (1) according to the mass ratio of 100:7.5:0.2:1000, and add the nanocrystalline cellulose colloid and zinc acetate to the In water and ethanol, ultrasonically disperse evenly, then add silver nitrate, ultrasonically disperse evenly, adjust the pH value of the system to 7 with 0.5mol / L sodium hydroxide, raise the temperature to 70-80°C, react for 2 hours, and then add boron to the mixed solution Sodium hydride (the mass ratio of sodium borohydride is 6% of silver nitrate), continue to react for 2 to 3 hours to obtain a composite; place the composite at 110 to 130°C for 0.5 to 1 hour to obtain a white NCC / ZnO / Ag compo...

Embodiment 3

[0029] (1) Take nanocrystalline cellulose and deionized water according to a mass ratio of 2.5:100, fully mix them, and carry out ultrasonic dispersion in an ice-water bath to obtain nanocrystalline cellulose colloids with a mass fraction of 2.5%;

[0030] (2) Weigh the nanocrystalline cellulose colloid, zinc acetate, silver nitrate, and dehydrated alcohol in step (1) according to the mass ratio of 100:9:0.3:1500, and add the nanocrystalline cellulose colloid and zinc acetate to the In water and ethanol, ultrasonically disperse evenly, then add silver nitrate, ultrasonically disperse evenly, adjust the pH value of the system to 7 with 0.5mol / L sodium hydroxide, raise the temperature to 70-80°C, react for 3 hours, and then add boron to the mixed solution Sodium hydride (the mass ratio of sodium borohydride is 8% of silver nitrate), continue to react for 2 to 3 hours to obtain a composite; place the composite at 110 to 130°C for 0.5 to 1 hour to obtain a white NCC / ZnO / Ag composit...

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Abstract

The invention discloses a method for preparing a photocatalyst by using a nanocrystalline cellulose template and belongs to the field of photocatalyst preparation. The method for preparing the photocatalyst by using the nanocrystalline cellulose template comprises the steps that nanocrystalline cellulose colloid, zinc acetate, silver nitrate and sodium borohydride are added to absolute ethyl alcohol, and an NCC / ZnO / Ag compound is obtained. The compound is subjected to centrifugal washing, vacuum freeze-drying and high-temperature calcination, and the ZnO / Ag photocatalyst with high catalysis capacity is prepared. According to the prepared photocatalyst, with the help of the high specific surface area of nanocrystalline cellulose, the ZnO / Ag photocatalyst is endowed with high specific surface area and reaction activity. It is proved through performance tests that the photocatalytic degradation rate of the ZnO / Ag photocatalyst prepared through the nanocrystalline cellulose template to 20mg / L of methylene blue under illumination of visible light within 2 h reaches 85-95%.

Description

technical field [0001] The invention relates to the field of photocatalyst preparation, in particular to a method for preparing a photocatalyst with high catalytic ability under visible light through a nanocrystalline cellulose template. Background technique [0002] As a photocatalytic material with wide bandgap (3.37eV) and high binding energy (~60meV), nano-ZnO has the characteristics of non-toxicity, high electron mobility, stable physical and chemical properties, and high photocatalytic activity. Under ultraviolet light or visible light, the electrons on the valence band of nano-ZnO are excited to the conduction band, forming electron-hole pairs, which react with organic matter to generate free radicals, and oxidize organic matter into water and carbon dioxide. [0003] Using nanocrystalline cellulose (nanocrystalline cellulose, NCC) as a template to prepare NCC / ZnO composite colloids by in-situ polymerization is a new method to improve the catalytic activity of nano-Zn...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/66B01J37/03B01J37/16B01J37/08C02F1/30C02F101/36C02F101/38
CPCC02F1/30B01J23/66B01J37/0018B01J37/031B01J37/082B01J37/16C02F2305/10C02F2101/36C02F2101/40C02F2101/38C02F2101/308B01J35/39
Inventor 潘明珠黄慧玲魏留洋梅长彤周晓燕
Owner NANJING FORESTRY UNIV
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