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Modified activated carbon and method for regenerating active carbon by photocatalysis of gas-solid fluidized bed

A technology of activated carbon and fluidized bed, which is applied in the field of activated carbon and its regeneration. It can solve the problems of changes in the chemical structure of the carbon surface, large loss of activated carbon, and secondary pollution of equipment, and achieve the effects of small loss of activated carbon, simple regeneration device, and simple equipment.

Active Publication Date: 2012-07-04
NANJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the existing methods have many problems such as large loss of activated carbon during the regeneration process, changes in the chemical structure of the carbon surface, secondary pollution in the regeneration process, complex equipment required, and difficulty in miniaturization.

Method used

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  • Modified activated carbon and method for regenerating active carbon by photocatalysis of gas-solid fluidized bed
  • Modified activated carbon and method for regenerating active carbon by photocatalysis of gas-solid fluidized bed
  • Modified activated carbon and method for regenerating active carbon by photocatalysis of gas-solid fluidized bed

Examples

Experimental program
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Effect test

Embodiment 1

[0036] First, add a certain amount of titanium tetrachloride to the mixture of ethanol, glacial acetic acid and a small amount of water, then add an appropriate amount of thiourea, and stir for a period of time to obtain S-TiO 2 Then add a certain amount of PEG to the sol, stir for 20 minutes, add a certain amount of activated carbon (AC), continue to stir for 1 hour, and ultrasonically disperse for 0.5 hours to obtain a mixture of AC and sol. Calcined in a furnace at 350°C for 3 hours to obtain modified activated carbon. After analysis, S-TiO 2 The mass fraction of sulfur in the medium is 0.9% (elemental analysis), and the modified activated carbon S-TiO 2 The load is 5%.

[0037] The activated carbon after adsorption saturation is regenerated by gas-solid fluidized bed photocatalytic method, and the photocatalytic regeneration is carried out in the surrounding figure 1 performed in the experimental setup shown. The experimental device used includes a reaction container,...

Embodiment 2

[0043] First, add a certain amount of titanium tetraisopropoxide to the mixture of ethanol, glacial acetic acid and a small amount of water, then add an appropriate amount of sulfur, and stir for a period of time to obtain S-TiO 2 Sol, then add a certain amount of PEG to the sol, after stirring for 50min, add a certain amount of AC, and ultrasonically disperse for 0.5h to obtain a mixture of AC and sol, dry at 90°C, and finally calcinate at 400°C for 2h in a programmable temperature control furnace , to obtain modified activated carbon. After analysis, S-TiO 2 The mass fraction of sulfur in the medium is 1.0% (elemental analysis), and the modified activated carbon S-TiO 2 The load is 6.5%.

[0044] The photocatalytic regeneration of activated carbon after adsorption saturation is figure 1 It is carried out in the device, take out the ultraviolet lamp, put the activated carbon into the reaction instrument from the upper port, spread it on the air distributor, insert the ult...

Embodiment 3

[0046] First, add a certain amount of tetrabutyl titanate to the mixture of ethanol, glacial acetic acid and a small amount of water, then add an appropriate amount of thiourea, and stir for a period of time to obtain S-TiO 2 Then add a certain amount of PEG to the sol, stir for 35 minutes, add a certain amount of AC, and stir for 50 minutes to obtain a mixture of AC and sol, dry it at 80°C, and finally calcinate it in a temperature-controlled furnace at 450°C for 1.5h. Obtain modified activated carbon. After analysis, S-TiO 2 The mass fraction of sulfur in the medium is 1.2% (elemental analysis), and the modified activated carbon S-TiO 2 The load is 10%.

[0047] The photocatalytic regeneration of activated carbon after adsorption saturation is figure 1 It is carried out in the device, take out the ultraviolet lamp, put the activated carbon into the reaction instrument from the upper port, spread it on the air distributor, insert the ultraviolet lamp into the instrument, ...

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Abstract

The invention discloses a modified activated carbon. The modified activated carbon is characterized in that a S-TiO2 photocatalyst is loaded on the active carbon. A method for preparing the modified activated carbon comprises the following steps of: adopting an inorganic salt or alcohol salt of titanium as a TiO2 precursor, adopting thiourea as a sulfur source, hydrolyzing sol for preparing inorganic hydrated metal oxide S-TiO2, adding the PEG and the activated carbon, stirring or ultrasonically mixing to be uniform, carrying out dipping treatment, drying and roasting the activated carbon after dipping treatment, and obtaining the modified activated carbon. The activated carbon can adopt a gas-solid fluidized bed photocatalytic method for regeneration. The modified activated carbon belongs to a suitable novel absorbent. The gas-solid fluidized bed photocatalytic method is simple, no secondary pollution is caused, the loss of the activated carbon is less, and the mechanical strength is not changed basically, so that the activated carbon and the regeneration technology thereof disclosed by the invention are environmentally-friendly.

Description

technical field [0001] The invention relates to an activated carbon and a regeneration method thereof, in particular to a modified activated carbon and a method for photocatalytically regenerating the activated carbon in a gas-solid fluidized bed. The gas-solid fluidized bed device is used to perform photocatalytic regeneration of the saturated activated carbon. Background technique [0002] Activated carbon regeneration refers to the process of removing the adsorbed substances and restoring its activity (adsorption performance) by physical, chemical or biochemical methods for activated carbon that loses its activity after adsorption saturation. How to efficiently regenerate activated carbon saturated with adsorption to achieve economical and rational utilization is a hot research topic at home and abroad. [0003] At present, the most widely used and industrially mature activated carbon regeneration method is thermal regeneration. The principle is to slowly dry the wet carb...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/34
Inventor 王玉萍彭盘英任建坤
Owner NANJING NORMAL UNIVERSITY
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