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A kind of adsorbent preparation method for removing nitrate in industrial wastewater

A technology for industrial wastewater and adsorbents, applied in chemical instruments and methods, water pollutants, water/sewage treatment, etc., can solve problems affecting nitrate adsorption, etc., and achieve good permeability, stable chemical bonds, and light weight

Active Publication Date: 2022-05-24
安徽博普纳米新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the concentration of nontoxic ions is low, their presence can significantly affect the completion of nitrate adsorption on the exchange sites

Method used

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  • A kind of adsorbent preparation method for removing nitrate in industrial wastewater
  • A kind of adsorbent preparation method for removing nitrate in industrial wastewater
  • A kind of adsorbent preparation method for removing nitrate in industrial wastewater

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preparation example Construction

[0031] A method for preparing an adsorbent for removing nitrate in industrial waste water, comprising the steps of:

[0032] Step 1: Put 2-10g SiO 2 The mesoporous nanomaterials were soaked in 50-200ml 2%-10% acid for 5-12 hours, and the SiO 2 Acidification and hydrolysis of mesoporous nanomaterials;

[0033] Step 2: Dissolve 2-10 g chitosan in 100-200ml deionized water or 2%-10% acid, stir under magnetic stirring for 2-6 hours;

[0034] Step 3: The acidified SiO 2 Add to the above chitosan solution, stir at room temperature for 4-8 hours, and filter the excess chitosan solution;

[0035] Step 4: add 2-4 g epichlorohydrin to the above-mentioned chitosan-functionalized mesoporous silica nanoparticles, add 1-5% KOH 20-100 ml, and reflux at 60-100 ° C for 2-8 hours;

[0036] Step 5: filter out the suspension of the polymer particles obtained in the above step 4; add dropwise 2-10g N,N,N',N'-tetraethyl-1,3-propanediamine and 20-40g ethanol to form The solution was stirred at ...

Embodiment 1

[0042] Step 1: Put 2g SiO 2 (100 mesh) mesoporous nanomaterials were soaked in 100ml 2% acetic acid for 5 hours to acidify and hydrolyze them;

[0043] Step 2: Dissolve 2g of chitosan (CS) in 100ml of 2% acetic acid, stir under magnetic stirring for 2 hours;

[0044] Step 3: The acidified SiO 2 Add to the above chitosan solution, stir at room temperature for 4 hours, and filter the excess chitosan solution;

[0045] Step 4: add 4 g of epichlorohydrin to the above-mentioned chitosan-functionalized mesoporous silica nanoparticles, add 20 ml of 1% KOH, and reflux at 60°C for 3 hours;

[0046] Step 5: The above polymer particles are filtered out of the suspension. Add dropwise a solution of 4g N,N,N',N'-tetraethyl-1,3-propanediamine and 20g ethanol, and stir at 40°C for 2 h;

[0047] Step 6: After the reaction is completed, filter, alternately wash the obtained adsorbent with 1.0M HCI, then wash with deionized water to neutral pH, and dry in an oven at 60°C to obtain an adsorben...

Embodiment 2

[0049] Step 1: Put 3g SiO 2 (50 mesh) mesoporous nanomaterials were soaked in 100ml 3% hydrochloric acid for 5 hours to acidify and hydrolyze them;

[0050] Step 2: Dissolve 5 g of chitosan (CS) in 200 ml of deionized water and stir under magnetic stirring for 2 hours;

[0051] Step 3: The acidified SiO 2 Add to the above chitosan solution, stir at room temperature for 5 hours, and filter the excess chitosan solution;

[0052] Step 4: add 3 g of epichlorohydrin to the above-mentioned chitosan-functionalized mesoporous silica nanoparticles, add 20 ml of 1% KOH, and reflux at 100°C for 2 hours;

[0053] Step 5: The above polymer particles are filtered out of the suspension. Add dropwise a solution of 5g N,N,N',N'-tetraethyl-1,3-propanediamine and 30g ethanol, and stir at 60°C for 3h;

[0054] Step 6: After the reaction is completed, filter, alternately wash the obtained adsorbent with 1.5 M HCl, then wash with deionized water to neutral pH, and dry in an oven at 80°C to obta...

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Abstract

A method for preparing an adsorbent for removing nitrate in industrial wastewater, comprising the steps of: SiO 2 Mesoporous nanomaterials soaked in acid, the SiO 2 Mesoporous nanomaterials are acidified and hydrolyzed; chitosan is dissolved in deionized water or acid, and magnetically stirred; the acidified SiO 2 Add chitosan solution, stir at room temperature, filter excess chitosan solution; add epichlorohydrin into chitosan functionalized mesoporous silica nanoparticles, add KOH to reflux; add N, N ,N',N'-tetraethyl-1,3-propylenediamine and ethanol solution, stirring; after filtering, alternately washing the obtained adsorbent with HCI, then washing with deionized water to neutral pH, drying dry to obtain an adsorbent for removing nitrate. The preparation process of the invention is simple, and the cost is low, easy to recycle and use, and the efficiency of removing nitrate is high.

Description

technical field [0001] The present invention relates to the technical field of adsorbent preparation methods, in particular to the technical field of preparation of adsorbents for removing nitrates in industrial wastewater. Background technique [0002] In all parts of the world, nitrate pollution in surface water and groundwater is an increasingly serious problem. With the rapid development of industry and agriculture, more "three wastes" are generated. After infiltration into the ground, the concentration of nitrate in groundwater will increase significantly. . Furthermore, nitrates are highly soluble in water and can easily pass through the soil into the drinking water supply. High intakes can cause abdominal pain, diarrhea, vomiting, high blood pressure, increased infant mortality, birth defects in the central nervous system, diabetes, spontaneous abortion, respiratory infections, and changes in the immune system. In recent years, several methods have been employed for...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/24B01J20/28B01J20/30B01J41/08C02F1/42C02F101/16
CPCB01J20/103B01J20/24B01J20/28004B01J41/08C02F1/42C02F2101/163C02F2001/422
Inventor 蔡建国石洪雁刘锐
Owner 安徽博普纳米新材料有限公司
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