Quaternary amine modified straw material for removing nitrate in water body, preparation method and application

A technology for modifying straw and nitrate, which is applied in chemical instruments and methods, biofuels, water pollutants, etc., can solve the problem of low nitrate nitrogen adsorption, improve activity, improve reaction efficiency, and reduce preparation costs Effect

Active Publication Date: 2022-08-05
AGRO ENVIRONMENTAL PROTECTION INST OF MIN OF AGRI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In addition, Sui et al. pretreated the straw with NaOH, and then dehydrated it by extrusion filtration, but the adsorption of nitrate nitrogen to the final product was extremely low.

Method used

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  • Quaternary amine modified straw material for removing nitrate in water body, preparation method and application
  • Quaternary amine modified straw material for removing nitrate in water body, preparation method and application
  • Quaternary amine modified straw material for removing nitrate in water body, preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] Preparation of quaternary amine modified straw MWS-ET:

[0071] ①The air-dried wheat straw was washed with distilled water, dried and pulverized, and then sieved. The straw with a particle size of 0.2-0.9 mm (20-80 mesh) was selected and dried at 60 °C for 24 h (named WS), sealed in a bag, and stored. in a glass desiccator.

[0072] (2) Take 2.0 g of straw and add 30 mL of 10% (w / v) NaOH solution for alkalization pretreatment at room temperature for 2 h, then squeeze, filter and dehydrate.

[0073] ③ Then put the straw in a 250 mL three-necked flask, add 30 mL of epichlorohydrin, and stir at 90 °C for 1 h.

[0074] 4.2 mL of ethylenediamine was slowly added, and the reaction was carried out at 89.5 °C for 54.0 min. 20 mL of trimethylamine solution was added to react at 90 °C for 3 h.

[0075] ④ The product was adjusted to neutrality with sodium hydroxide and hydrochloric acid, washed with ethanol and deionized water, and dried in an oven at 60 °C for use.

[0076] T...

Embodiment 2

[0078] Preparation of quaternary amine modified straw MWS-ET1:

[0079] ①The air-dried wheat straw was washed with distilled water, dried and pulverized, and then sieved. The straw with a particle size of 0.2-0.9 mm (20-80 mesh) was selected and dried at 60 °C for 24 h (named WS), sealed in a bag, and stored. in a glass desiccator.

[0080] ② Take 2.0 g of straw and add 30 mL of 10% (w / v) NaOH solution to alkalize it for 2 h at room temperature, and dehydrate it by vacuum freeze-drying to make the moisture content reach 15%-25%.

[0081] ③ Mix isopropanol with straw samples by fumigation treatment, so that the water / isopropanol ratio is 90%-100%.

[0082] ④ Then put the straw into a 250 mL three-necked flask, add 30 mL of epichlorohydrin, and stir at 90 °C for 1 h. 4.2 mL of ethylenediamine was slowly added, and the reaction was carried out at 89.5 °C for 54 min. 20 mL of trimethylamine solution was added to react at 90 °C for 3 h.

[0083] ⑤ The product was adjusted to ne...

Embodiment 3

[0085] Preparation of quaternary amine modified straw MWS-ET2:

[0086] ①The air-dried wheat straw was washed with distilled water, dried and pulverized, and then sieved. The straw with a particle size of 0.2-0.9 mm (20-80 mesh) was selected and dried at 60 °C for 24 h (named WS), sealed in a bag, and stored. in a glass desiccator.

[0087] ② Take 2.0 g of straw and add 30 mL of 10% (w / v) NaOH solution for alkali pretreatment at room temperature for 2 h, dehydrate by vacuum freeze-drying method to make the moisture content reach 15%-25%, and then use fumigation The treatment method is to mix isopropanol with the straw sample (for example, the ratio of straw sample to isopropanol is 2:1.8-2 in g:mL), so that the water / isopropanol ratio is 90%-100%.

[0088] ③ Then put the straw in a 250 mL three-necked flask, add 20 mL of epichlorohydrin, and stir at 90 °C for 1 h. 4.2 mL of ethylenediamine was slowly added, and the reaction was carried out at 89.5 °C for 54 min.

[0089] ④A...

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Abstract

The invention belongs to the technical field of water treatment materials, and discloses a quaternary amine modified straw material for removing nitrate in water body, a preparation method and application thereof. Dry at 60 °C for 24 h, pack in a sealed bag, and store in a glass desiccator; take the obtained straw, add 10% NaOH solution by mass, and carry out alkali pretreatment at room temperature for 2 h to obtain a treatment solution, which is dehydrated; Then add epichlorohydrin to the straw sample; slowly add ethylenediamine to obtain ethylenediamine-treated straw; add 30% trimethylamine solution by volume and react at 90 °C for 3 h; the product is adjusted with sodium hydroxide and hydrochloric acid to neutral, washed with ethanol and deionized water, and dried in an oven at 60° C. to obtain a quaternary amine modified straw material. The invention uses NaOH and ethylenediamine as main reagents, reduces the use of highly toxic reagents, and reduces the preparation cost of quaternary amine modified straw.

Description

technical field [0001] The invention belongs to the technical field of water treatment materials, in particular to a quaternary amine modified straw material for removing nitrate groups in water, a preparation method and an application. Background technique [0002] NO in water 3 - Pollution is widespread. According to surveys, NO in water bodies in many parts of India 3 - The content is very high, including Dharampuram, Tamil Nadu up to 415 mg / L, NO in groundwater in some parts of Mehedinți County, Romania 3 - More than 350mg / L, NO in Mudanjiang water body in China 3 - The concentration also reached 105 mg / L. excess NO 3 - It will not only cause water eutrophication, but also enter the human body through enrichment and cause many health problems, such as dyspnea, headache, thyroid hypertrophy, gastric cancer, multiple sclerosis and methemoglobin disease, etc. Therefore, the World Health Organization strictly restricts drinking. water NO 3 - The concentration doe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/24B01J20/30C02F1/28C02F101/16
CPCB01J20/24B01J20/22C02F1/286C02F2101/163Y02E50/10
Inventor 王风张理胜张克强
Owner AGRO ENVIRONMENTAL PROTECTION INST OF MIN OF AGRI
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