Preparation method and application of nitrogen-doped sludge compost visible light photocatalytic material

A photocatalytic material and visible light technology, applied in the field of photocatalytic materials, can solve the problem of incomplete carbonization of sludge, and achieve the effect of accelerating the hydrothermal carbonization process, avoiding agglomeration and large specific surface area.

Active Publication Date: 2020-05-01
ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the sludge undergoes cell destruction in the hydrothermal environment, releasing a large amount of organic acid substances, and the acidic environment will inhibit the hydrothermal carbonization of the sludge, resulting in incomplete carbonization of the sludge

Method used

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  • Preparation method and application of nitrogen-doped sludge compost visible light photocatalytic material
  • Preparation method and application of nitrogen-doped sludge compost visible light photocatalytic material
  • Preparation method and application of nitrogen-doped sludge compost visible light photocatalytic material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] In this example, the preparation method of nitrogen-doped porous carbon visible light catalytic material using urea as a sludge composting product supplemented with nitrogen source is as follows:

[0038] Take 100g of compost products with a carbon-to-nitrogen ratio of 35, freeze-dry them for 48 hours to obtain dry solid particles, grind them through a 40-mesh sieve, put 2.5g of the resulting solids into a 100ml polytetrafluoroethylene-lined stainless steel autoclave, and add 50ml of deionized Water, take it out after reacting in a high-temperature oven at 180°C for 5 hours, cool to room temperature, take out the cooled mixture and centrifuge, wash the obtained solid with deionized water and ethanol several times in turn, dry it at 60°C for 24 hours, and then grind The sludge-based carbon visible light catalytic material is obtained.

[0039] The preparation method of the compost product in this example is as follows: the sludge aerobic compost product uses dewatered sl...

Embodiment 2

[0041] In this example, urea is used as a sludge composting product to supplement nitrogen source to prepare nitrogen-doped porous carbon see photocatalytic material. The preparation method is as follows:

[0042] As in Example 1, the catalyst obtained by comparing sludge composting products under different conditions is to the degradation reaction rate of Rhodamine B (such as Figure 4 shown). Depend on Figure 4 It can be seen that under light conditions, the catalyst prepared by adding urea as a supplementary nitrogen source has the best effect, and the catalyst prepared without urea has the second best effect, while the degradation efficiency of the catalyst on rhodamine B is the worst under the dark condition.

[0043] The catalytic degradation performance of nitrogen-doped sludge-based materials added with urea is significantly better than that of sludge-based materials without urea, because the metals (Fe, Zn, Ti, etc.) in the sludge aerobic composting products are hyd...

Embodiment 3

[0045] In this example, urea is used as the sludge composting product to supplement nitrogen source to prepare nitrogen-doped porous carbon see photocatalytic material. The preparation method is as follows:

[0046] As in Example 1, the difference is that the range of deionized water added to the polytetrafluoroethylene-lined stainless steel autoclave is 5 ~ 50ml, and the catalysts obtained by adding different amounts of water are compared to the degradation reaction of rhodamine B under visible light irradiation. rate (eg Figure 5 shown), by Figure 5 It can be seen that the photocatalyst prepared with 50ml of water has the best effect.

[0047] When the amount of added water increased from 5ml to 50ml, the catalytic effect of the obtained sludge-based material was better. The increase of the liquid-solid ratio mainly enhances the solubility of water, and promotes the dehydration and decarbonylation reactions of the main components of organic matter, making the hydrotherma...

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Abstract

The invention discloses a preparation method and application of a nitrogen-doped sludge compost visible light photocatalytic material. Urea is used as a sludge aerobic composting product for supplementing a nitrogen source; under certain pressure and temperature conditions, a nitrogen-doped carbon nano porous material composed of C, O, N, Al, Si, Fe, Mg, Zn, Ti and other elements is synthesized through a hydrothermal carbonization method, and a method for degrading organic pollutants through visible light in an oxalic acid system through hydrothermal carbonization of sludge is constructed. According to the method, the sludge aerobic composting product is converted into an environmental remediation material, so that the resource utilization of the sludge is realized. The method is low in cost, simple to operate and easy to popularize, and an efficient visible light catalytic material is provided for organic wastewater treatment.

Description

technical field [0001] The invention belongs to the technical field of photocatalytic materials, and in particular relates to a method for preparing a nitrogen-doped porous carbon visible light photocatalytic material from sludge compost products using urea as a supplementary nitrogen source and an application thereof. Background technique [0002] With the rapid economic development, domestic sewage and industrial wastewater have increased rapidly. As an inevitable by-product in the sewage treatment process, the output of sludge has also increased significantly. Aerobic composting is an effective way of sludge disposal. The high temperature in the composting process can kill pathogenic bacteria and degrade some organic matter in sludge at the same time, so as to achieve the purpose of sludge reduction and harmlessness. Due to the complex sources of sludge, which usually contain different concentrations of heavy metals and refractory organic pollutants, compost products are ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J35/10B01J37/10C02F11/02C02F11/00A62D3/17C02F101/30A62D101/26A62D101/28
CPCB01J27/24B01J35/10B01J35/1004B01J35/004B01J35/023B01J37/10B01J37/06C02F11/02C02F11/00A62D3/17C02F2101/30C02F2303/04A62D2101/26A62D2101/28
Inventor 庞龙刘惠美张美娟梁娓娓杨惠强
Owner ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
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