A kind of modified cotton fiber adsorbent for removing nitrate nitrogen and its preparation method and application

A technology for modifying cotton and nitrate nitrogen, applied in chemical instruments and methods, adsorption water/sewage treatment, other chemical processes, etc., can solve the problems of inability to adsorb nitrate well, small adsorption capacity, poor adsorption effect, etc. , to achieve the effect of large production, improved adsorption effect and reduced interference

Active Publication Date: 2020-08-14
NANJING UNIV
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Problems solved by technology

The adsorption effect of unmodified cotton products is very poor, and it has basically no adsorption effect on nitrate in water, so chemical modification of cotton fibers is necessary
In recent years, some researchers have used chemical agents to modify cellulose, modifying the functional groups on the surface of cellulose, so that there are a large number of amine functional groups on it, so that the cellulose is loaded with a large amount of positive charges, which improves the cellulose's ability to absorb water. The adsorption and removal rate of nitrate, such as CN201510454399.5 discloses a preparation method of a straw cellulose modified anion adsorbent to adsorb anions such as nitrate ions and phosphate ions in wastewater, but the straw cellulose in this patent With strong hydrophilicity, water molecules will interfere with the adsorption of anions in the water body by the adsorbent, resulting in a decrease in the adsorption rate; CN201510430879.8 discloses that diethylenetriamine is used as a cross-linking agent to modify wheat straw to prepare adsorbents for adsorption For dye molecules such as acid chrome blue K (AK), bright green (LG) and Cr (Ⅵ), but the adsorption capacity is small, and it cannot adsorb nitrate well

Method used

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  • A kind of modified cotton fiber adsorbent for removing nitrate nitrogen and its preparation method and application

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preparation example Construction

[0022] The invention provides a kind of preparation method of the modified cotton fiber adsorbent for removing nitrate nitrogen, comprising the following steps:

[0023] Refining cotton fibers to obtain refined cotton fibers;

[0024] Mixing the refined cotton fiber, N,N-dimethylformamide and epichlorohydrin for an etherification reaction to obtain an etherification product;

[0025] Mixing the etherification product, ethylenediamine and triethylamine for a nucleophilic substitution reaction to obtain a nucleophilic substitution product;

[0026] The nucleophilic substitution product, potassium iodide and brominated n-decane are mixed for alkylation reaction to obtain a modified cotton fiber adsorbent for removing nitrate nitrogen.

[0027] The invention refines the cotton fiber to obtain the refined cotton fiber. In the present invention, the source of the cotton fiber is not particularly limited, and commercially available products or discarded cotton products well known t...

Embodiment 1

[0046] Soak and clean the waste cotton fiber in deionized water to remove dust and impurities on the surface, then put it into a constant temperature drying box, dry it at 60°C for 12 hours, pulverize it with a pulverizer, and pass through a 120-mesh sieve to obtain cotton fiber powder. Put it into a beaker containing NaOH (0.05mol / L), and magnetically stir it at 60°C for 4 hours to remove cellulose impurities in cotton products, then wash it with deionized water three times, and then put it in a constant temperature drying oven to dry at 60°C 2h, take out 2g of the obtained refined cotton fiber and put it into a three-neck round bottom flask, add epichlorohydrin as a crosslinking agent, N,N-dimethylformamide (DMF) 10mL as a solvent, and heat at 90°C for 1h After reaction, 3 mL of ethylenediamine was added and stirred and heated at 90° C. for 1 h. Then add 6 mL of triethylamine (99%) solution, stir and heat at 90° C. for 1.5 h, modify the cellulose on the cotton fiber, introdu...

Embodiment 2

[0050] Soak and clean the cotton products in deionized water to remove dust and impurities on the surface, then put them into a constant temperature drying oven, dry them at 70°C for 12 hours, and then pass them through a 100-mesh sieve through a pulverizer to crush the cotton fibers The powder was put into a beaker containing NaOH (0.1 mol / L), magnetically stirred at 45°C for 6h, washed with deionized water three times, and dried in a constant temperature drying oven at 60°C for 4h. After drying, put it into a three-necked round bottom flask, add epichlorohydrin as a crosslinking agent, DMF as a solvent, and heat at 90°C for 1h to react; then add ethylenediamine and stir and heat at 90°C for 1h; add three Ethylamine (99%) solution was stirred and heated at 90°C for 1.5h, and the mass volume ratio of the mass of cotton fiber added, DMF, ethylenediamine, and triethylamine was 2g:10mL:3mL:6mL. Wash the unreacted organic matter on the surface with absolute ethanol, and put it int...

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Abstract

The invention provides a preparation method of a modified cotton fiber coagulant and belongs to the field of deep treatment and reuse of wastewater. The preparation method utilizes ethylenediamine andtriethylamine to modify the agricultural straw cotton fibers, thereby increasing the positive charge on the cotton fibers. The triethylamine-modified cotton fibers have high nitrate adsorption effects. The nitrate has high solubility in water so that water molecules can interfere the adsorption of nitrate by the adsorbent. The cotton fibers modified by ethylenediamine and triethylamine have a certain hydrophobicity. A long chain on an alkalescent functional group improves the hydrophobicity of the modified cotton fiber, reduces the interference of water molecules on the adsorption of nitrateions by the modified cotton fibers, effectively improves the adsorption effect of the modified cotton fibers on nitrate ions and maximizes the adsorption of nitrate in the wastewater.

Description

technical field [0001] The invention belongs to the technical field of advanced treatment and reuse of wastewater, and in particular relates to a modified cotton fiber adsorbent for removing nitrate nitrogen, a preparation method and application thereof. Background technique [0002] Due to social development, more and more nitrogen-containing wastewater is discharged into water bodies, resulting in nitrogen pollution of water bodies. With the country's restrictions on the concentration of nitrogen pollutants in wastewater discharge, generally polluted wastewater can only be discharged after a certain process treatment reaches the standard, so various denitrification technologies have emerged. Traditional denitrification technologies can be divided into physical, chemical and biological methods. These methods have a certain effect on the treatment of nitrogen pollution in water bodies, but most of the methods not only have large investment in reaction equipment, high operat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/24C02F1/56C02F1/28C02F101/16
CPCC02F1/286C02F1/56C02F2101/163
Inventor 刘波侯玉倩程绍举周德超杜凌峰盛世雄
Owner NANJING UNIV
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