Recyclable high-efficiency photocatalytic degradation material and preparation method thereof

A technology for degrading materials and photocatalysis, applied in the field of high-efficiency photocatalytic degradation materials and their preparation, can solve the problems of high density and easy sinking at the bottom of sewage, affecting the efficiency of photocatalytic degradation, and easily absorbing ultraviolet and visible light, and achieving good equipment versatility. , The effect of high utilization rate of raw materials and simple process

Active Publication Date: 2019-04-12
SOUTHWEST FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current photocatalyst carrier materials have problems such as easy sinking at the bottom of sewage due to their high density, and easy absorption of ultraviolet and visible light due to their black color, which affects the photocatalytic degradation efficiency.

Method used

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  • Recyclable high-efficiency photocatalytic degradation material and preparation method thereof
  • Recyclable high-efficiency photocatalytic degradation material and preparation method thereof
  • Recyclable high-efficiency photocatalytic degradation material and preparation method thereof

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preparation example Construction

[0019] A method for preparing a recyclable high-efficiency photocatalytic degradation material includes A: biomass bleaching, B: preparation of titanium dioxide nanoparticle suspension, C: surface treatment, specifically including:

[0020] A: Biomass bleaching

[0021] The biomass material with a moisture content lower than 25% is made into a biomass unit to be treated with a length of 1-50 cm, a width of 1-50 cm, and a thickness of 0.01-5 cm, and bleaching solution (0.1-10 mol / L) heated to 40°C~100°C, use bleaching solution to steam bleach or solution bleach the biomass unit for 0.2~48h to get the bleached biomass skeleton, then rinse with deionized water or ethanol for 3-5 times, at room temperature Dry and reserve;

[0022] B: Preparation of Titanium Dioxide Nanosuspension

[0023] Disperse titanium dioxide nanoparticles in water, sonicate for 5-20 minutes, let stand overnight, and take the upper titanium dioxide nanoparticle suspension solution for later use;

[0024]...

Embodiment 1

[0033] Process the linden wood with a moisture content of 10% to be processed into a wood sample of 5 cm x 5 cm x0.5 cm and place it on a plastic grid (aperture size: 0.5 cm, 2 cm from the liquid surface) in a glass beaker. The grid was placed above 30% hydrogen peroxide, and steamed at 100°C for 4 hours, then the wood-based composite material was taken out, rinsed three times with deionized water, and bleached wood was obtained. P25 was ultrasonically dispersed in deionized water, sonicated for 10 minutes, left to stand overnight, and the upper layer solution was taken to obtain a suspension solution of titanium dioxide nanoparticles with a concentration of 5 g / L, which was coated on the wood surface and dried at room temperature to obtain bleached wood / titanium dioxide Composite photocatalytic materials. The above-mentioned bleached wood / titanium dioxide composite photocatalytic material and the same amount of P25 suspension were respectively added to two parts of the same v...

Embodiment 2

[0037]Put the poplar leaves (size 10cm x 8cm x 0.05cm) with a moisture content of 5% to be treated on the stainless steel grid (aperture size: 3.0 cm) in the stainless steel container, and the stainless steel grid is immersed in 30% hydrogen peroxide at 95 °C for 6 hours, and then the bleached poplar leaves were taken out and washed with deionized water for 4 times to obtain the bleached poplar leaves. P25 was ultrasonically dispersed in deionized water for 5 minutes, left standing overnight, and the upper layer solution was taken to obtain a suspension solution of titanium dioxide nanoparticles with a concentration of 10 g / L, which was coated on the surface of bleached poplar leaves, and dried at room temperature to obtain bleached poplar leaves / Nano titanium dioxide composite photocatalytic material.

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Abstract

The invention discloses a recyclable high-efficiency photocatalytic degradation material and a preparation method thereof. The preparation method comprises the following steps: A, performing bleachingon biomass; B, preparing a titanium dioxide nanoparticle suspension; and C, performing surface treatment. According to the method provided by the invention, a steam process or solution immersion is adopted to remove lignin in a biomass material to obtain bleached biomass, photocatalyst nanoparticles such as titanium dioxide are uniformly dispersed on the obtained bleached biomass, and an originalskeleton is retained; the bleaching method provided by the invention has the advantages of greenness, high efficiency, a simple process, a high utilization rate of raw materials and good equipment universality, and facilitates large-scale production; and the surface and interior of the obtained bleached wood can uniformly load titanium dioxide nanoparticles to obtain a three-dimensional porous bleached biomass/titanium dioxide composite photocatalytic material, and the composite photocatalytic material can be floated, transmit ultraviolet visible light, be recyclable and be applied in a large-scale industrialized manner.

Description

technical field [0001] The invention belongs to the technical field of material and process preparation, and in particular relates to a recyclable, high-efficiency photocatalytic degradation material capable of large-scale industrial degradation of sewage and recyclable use and a preparation method thereof. Background technique [0002] Titanium dioxide, as an important transition metal oxide, is widely used in pigments, catalysts, wood protection, skin care products, food packaging, sensors and adsorbents, photosensitive materials, dye-sensitized solar cells, photoelectrochemical cells and other fields. much attention. As Frank and Bard first discovered that titanium dioxide can degrade cyanide in wastewater in 1977, titanium dioxide has been widely studied and applied in the fields of water purification, air purification and sewage treatment. The main factors affecting the photocatalytic activity of titanium dioxide are: crystal form, particle size, and ion doping. Howev...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/38C02F1/30C02F101/36C02F101/38
CPCB01J31/38B01J35/0013B01J35/004C02F1/30C02F2101/308C02F2101/36C02F2101/38C02F2101/40C02F2305/10
Inventor 郑荣波郭雪莲何玉明
Owner SOUTHWEST FORESTRY UNIVERSITY
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