Preparation method of adsorbent 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 and other issues

Active Publication Date: 2021-07-06
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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  • Preparation method of adsorbent for removing nitrate in industrial wastewater
  • Preparation method of adsorbent for removing nitrate in industrial wastewater
  • Preparation method of adsorbent for removing nitrate in industrial wastewater

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preparation example Construction

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

[0032] Step 1: Mix 2-10g SiO 2 Soak mesoporous nanomaterials in 50-200ml 2%-10% acid for 5-12 hours, and SiO 2 Acid hydrolysis of mesoporous nanomaterials;

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

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

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

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

Embodiment 1

[0042] Step 1: Add 2g SiO 2 (100 mesh) mesoporous nanomaterials were soaked in 100ml 2% acetic acid for 5 hours, acidified and hydrolyzed;

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

[0044]Step 3: The acidified SiO 2 Add in the above-mentioned chitosan solution, stir at room temperature for 4 hours, and suction 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 a solution consisting of 4g N,N,N',N'-tetraethyl-1,3-propanediamine and 20g ethanol dropwise, 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 ...

Embodiment 2

[0049] Step 1: Add 3g SiO 2 (50 mesh) mesoporous nanomaterials were soaked in 100ml 3% hydrochloric acid for 5 hours, acidified and hydrolyzed;

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

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

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

[0053] Step 5: The above polymer particles are filtered out of the suspension. A solution consisting of 5g of N,N,N',N'-tetraethyl-1,3-propylenediamine and 30g of ethanol was added dropwise, and stirred at 60°C for 3h;

[0054] Step 6: After the reaction is completed, filter, alternately wash the obtained adsorbent with 1.5 M HCI, then wash with deionized water to neutr...

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Abstract

A preparation method of an adsorbent for removing nitrate in industrial wastewater comprises the following steps: soaking a SiO2 mesoporous nano-material in acid, and acidifying and hydrolyzing the SiO2 mesoporous nano-material; dissolving chitosan in deionized water or acid, and magnetically stirring; adding the acidified SiO2 into a chitosan solution, stirring at room temperature, and carrying out suction filtration on redundant chitosan solution; adding epichlorohydrin into chitosan functionalized mesoporous silica nanoparticles, and adding KOH for reflux; adding dropwise a solution comprising N, N, N', N' -tetraethyl- 1,3- propanediamine and ethanol, and stirring; and after filtering, alternately washing the obtained adsorbent with HCI, washing the adsorbent with deionized water to neutral pH, and drying to obtain the adsorbent for removing nitrate. The method is simple in preparation process, low in cost, easy to recycle and high in nitrate radical removal efficiency.

Description

technical field [0001] The invention relates to the technical field of adsorbent preparation methods, in particular to the technical field of preparing an adsorbent for removing nitrate in industrial wastewater. Background technique [0002] Nitrate pollution in surface water and groundwater is a growing problem all over the world. With the rapid development of industry and agriculture, more "three wastes" are produced. After seeping into the ground, the concentration of nitrate in groundwater will increase significantly . Also, nitrates are highly soluble in water and can easily pass through the soil into drinking water supplies. High intakes can cause abdominal pain, diarrhea, vomiting, high blood pressure, increased infant mortality, central nervous system birth defects, diabetes, spontaneous abortion, respiratory infections, and changes in the immune system. In recent years, various methods have been adopted for the removal of nitrate in wastewater. Methods for remo...

Claims

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Application Information

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Patent Type & Authority Applications(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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