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Technology for synergistically increasing oxygen-containing groups in charcoal with ozone and ultraviolet irradiation

A technology of biochar and external irradiation, applied in other chemical processes, chemical instruments and methods, etc., can solve the problems of high production cost, secondary pollution, and many chemical reagents, and achieve low processing cost, promotion of reproduction, and easy operation Effect

Pending Publication Date: 2019-06-25
ANHUI SCI & TECH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method introduces exogenous ions during the generation process, and the production cost is high
Chinese application number 201380042335.3 discloses a method to improve the hydrophilicity of activated carbon and increase the basic functional groups on the surface, but the method is cumbersome, uses many chemical reagents, and is prone to secondary pollution problems

Method used

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  • Technology for synergistically increasing oxygen-containing groups in charcoal with ozone and ultraviolet irradiation

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Effect test

Embodiment 1

[0036] Pass the prepared biochar material through a 60-mesh sieve, wash and dry it, and then contact it with ozone. The concentration of ozone used is 3 mg / L, and the concentration of biochar is 10% (w / v). The mixture of biochar and ozone was heated to 30 °C and stirred magnetically at 200 rpm for 24 h. Spread the biochar material on the temperature-controlled electric heating plate, the thickness is controlled within 3 mm, and heated to 200 °C. An ultraviolet radiation lamp was placed 50 cm vertically above the biochar material. The wavelength range of the main spectral line of ultraviolet radiation was 254 nm, the radiation power was 100 W, and the irradiation time was 24 h. During the irradiation process, the biochar was turned once every 12 h, and put into the ozone contact column again for 5-10 min. After the ultraviolet irradiation, the biochar material was collected into a kraft paper bag, and dried in an oven at 60°C to a constant weight to obtain biochar with high ox...

Embodiment 2

[0038] Pass the prepared biochar material through a 60-mesh sieve, wash and dry it, and contact it with ozone. The concentration of ozone used is 3 mg / L, and the concentration of biochar is 20% (w / v). The mixture of biochar and ozone was heated to 30 °C and stirred magnetically at 200 rpm for 24 h. Spread the biochar material on the temperature-controlled electric heating plate, the thickness is controlled within 3 mm, and heated to 200 °C. An ultraviolet radiation lamp was placed 50 cm vertically above the biochar material. The wavelength range of the main spectral line of ultraviolet radiation was 254 nm, the radiation power was 100 W, and the irradiation time was 24 h. During the irradiation process, the biochar was turned once every 12 h, and put into the ozone contact column again for 5-10 min. After the ultraviolet irradiation, the biochar material was collected into a kraft paper bag, and dried in an oven at 60°C to a constant weight to obtain biochar with high oxygen-...

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Abstract

The invention relates to a technology for synergistically increasing oxygen-containing groups in a charcoal material with ozone and ultraviolet irradiation. The technology mainly comprises the following steps: the prepared charcoal material is sieved, washed and dried, then is mixed with ozone, and is heated to 100-500 DEG C; the charcoal material is spread on a temperature-controlled electric hotplate, and is irradiated with an ultraviolet irradiation lamp having an ultraviolet ray wavelength of 10-380 nm for 24 h, the material is placed in an ozone contact column one time every 12 h, and ozone is introduced, wherein the temperature of the charcoal is kept at 200 DEG C in the irradiation process; and the charcoal material is dried after the ultraviolet irradiation is finished. The technology can significantly increase the quantity of the oxygen-containing groups in the charcoal material.

Description

technical field [0001] The invention belongs to the technical field of biochar material modification, and relates to a process for synergistically increasing oxygen-containing groups of biochar by ozone and ultraviolet irradiation. Background technique [0002] In recent years, biochar, as a new type of environmental material, has become a powerful weapon in the pollution prevention and control of soil, water and air environmental media due to its wide range of preparation sources, low production cost, and strong ability to remove pollutants. As a material completely different from activated carbon, activated carbon mainly relies on the huge specific surface area to physically adsorb pollutants, while biochar mainly relies on the chemical functional groups distributed on its surface to form new chemical bonds with pollutants, thereby producing pollutant removal effects, and this The chemical bonds formed between the chemical functional groups and pollutants are very stable, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/30
Inventor 谢越汪日松张丽
Owner ANHUI SCI & TECH UNIV
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