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Preparation method and application of magnetic hydrothermal carbon adsorbent

An adsorbent and magnetic water technology, which is applied in the field of environmental engineering, can solve the problems of large volume and quantity, complex composition, and high cost, and achieve the effect of increasing adsorption sites, expanding the application range, and facilitating adsorption applications

Inactive Publication Date: 2019-06-14
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

my country's urban sludge is not only large in volume and quantity, but also complex in composition. The existing sludge treatment and disposal technologies still have shortcomings: sanitary landfills occupy a large amount of land resources; anaerobic digestion requires large investment, long fermentation time and low gas production rate. Low; aerobic composting occupies a large area and is prone to produce harmful gases; dry incineration requires deep dehydration of sludge, which is costly
However, if hydrothermal charcoal is to be widely used as an adsorption material in engineering, its adsorption capacity needs to be further improved.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Step 1: Dry the remaining sludge from the urban sewage treatment plant, grind it through a 60-mesh sieve, pack it into a drying dish and put it in a dry dish for later use. Weigh 60g of sludge granules, add 540ml of deionized water to prepare a water content of 90%, put it into a hydrothermal carbonization reaction kettle, pass nitrogen into the reaction kettle to form an oxygen-free environment in the kettle, and hydrothermal carbonization reaction at 200°C After 3 hours, the product was taken out after cooling at room temperature, vacuum-filtered with a 0.45 μm filter membrane, washed several times with water, and the solid was taken out and dried at 105° C. to obtain hydrothermal charcoal with a charcoal yield of 54.23%.

[0024] Step 2: In the four-necked flask that 100ml ultrapure water is housed, nitrogen gas is discharged air, and Fe 2 (SO 4 ) 3 (4g) and FeSO 4 ·7H 2 O(2.78g)(Fe 3+ / Fe 2+ The molar ratio of the substance is 1:1) into the flask until complet...

Embodiment 2

[0027] Step 1: Dry the remaining sludge from the urban sewage treatment plant, grind it through a 60-mesh sieve, pack it into a drying dish and put it in a dry dish for later use. Weigh 60g of sludge granules, add 540ml of deionized water to prepare a water content of 90%, put it into a hydrothermal carbonization reaction kettle, pass nitrogen into the reaction kettle to form an oxygen-free environment in the kettle, and hydrothermal carbonization reaction at 200°C After 3 hours, the product was taken out after cooling at room temperature, vacuum-filtered with a 0.45 μm filter membrane, washed several times with water, and the solid was taken out and dried at 105° C. to obtain hydrothermal charcoal with a charcoal yield of 54.23%.

[0028] Step 2: In a four-necked flask with 100ml ultrapure water, the air is discharged by nitrogen gas, and the FeCl 3 ·6H 2 O(5.41g) and FeSO 4 ·7H 2 O(2.78g)(Fe 3+ / Fe 2+ The molar ratio of the substances is 2:1) into the flask until comple...

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Abstract

The invention discloses a preparation method and application of a magnetic hydrothermal carbon adsorbent. The preparation method of the hydrothermal carbon adsorbent comprises the following steps: (1)preparing a ferric ion solution, wherein a mass ratio of Fe<3+> to Fe<2+> in the ferric ion solution is (1-2):1; and (2) adding hydrothermal carbon into the ferric ion solution prepared in step (1),mixing and stirring, enabling Fe<3+> and Fe<2+> to react under an alkaline condition and generate Fe3O4, loading Fe3O4 on the hydrothermal carbon, and carrying out solid-liquid separation to obtain asolid material which is the magnetic hydrothermal carbon adsorbent. The magnetic hydrothermal carbon adsorbent can be used for removing phosphorus in the water and removing heavy metal ions in the water; adsorption sites on the surface of the hydrothermal carbon are obviously increased through a magnetic activation process on the basis of the hydrothermal carbon, so that adsorbed ions are more strongly combined on the surface of the hydrothermal carbon; the magnetic hydrothermal carbon adsorbent has adsorption performance better than that of ordinary hydrothermal carbon.

Description

technical field [0001] The invention belongs to the technical field of environmental engineering, and in particular relates to a preparation method and application of a magnetic hydrothermal carbon adsorbent. Background technique [0002] As of the end of September 2015, a total of 3,830 sewage treatment plants have been built in cities and towns across the country, and the sewage treatment capacity has reached 162 million m 3 / d, the associated sludge has exceeded 30 million t / year (calculated with a moisture content of 80%). Sludge has a high water content and contains a large number of harmful organisms such as pathogens and microorganisms, heavy metals and organic matter. If the sludge is not treated correctly, it will not only reduce the effective treatment capacity of the sewage treatment system, but also pose a serious threat to the environment and human activities. According to relevant data from the Ministry of Housing and Urban-Rural Development, nearly half of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/28B01J20/30C02F1/28C02F101/10C02F101/20C02F101/22
Inventor 方俊华许劲李杨唐琦范准吕秋颖
Owner CHONGQING UNIV
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