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Method for preparing organic modified clay for removing organic pollutants from wastewater

A technology of organic pollutants and clay, applied in chemical instruments and methods, adsorption water/sewage treatment, other chemical processes, etc., can solve problems such as application limitations, and achieve the effect of strengthening the distribution of adsorption and enhancing the adsorption efficiency

Inactive Publication Date: 2015-06-24
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, the quaternary ammonium salt surfactants used in the preparation of organically modified clays are limited to long-chain alkyl quaternary ammonium cationic surfactants or mixed with non-ionic surfactants, and often only under strong alkali conditions can a higher removal rate be achieved. rate, making its application in wastewater treatment limited

Method used

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  • Method for preparing organic modified clay for removing organic pollutants from wastewater
  • Method for preparing organic modified clay for removing organic pollutants from wastewater

Examples

Experimental program
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Effect test

Embodiment 1

[0015] In a 1000mL beaker, add 10g of montmorillonite dried and crushed through a 20-mesh sieve and 500mL of 0.05mol / L Gemini surfactant (C 12 h 25 N + BrCH 2 ) 2 The solution was magnetically stirred at 60° C. for 18 hours, centrifuged to obtain a solid product, dried at 80° C., ground, and passed through a 100-mesh sieve to obtain an organically modified montmorillonite.

[0016] Will make (C 12 h 25 N + BrCH 2 ) 2 Add 0.1 g of modified organic montmorillonite to 200 mL of 100 mg / L phenol solution and mix. The temperature was 25°C and the rotational speed was 190r / min. The adsorption was oscillating for 6h, centrifuged, and the supernatant was taken to measure the remaining phenol concentration by UV-Vis spectrophotometry. The calculated phenol removal rate was 81%.

Embodiment 2

[0018] In a 500mL beaker, add 5g of bentonite that was dried and crushed through a 50-mesh sieve and 300mL of 0.005mol / L Gemini surfactant (C 16 h 33 N + BrCH 2 CHOH) 2 The solution was magnetically stirred at 80°C for 24 hours, centrifuged to obtain a solid product, dried at 80°C, ground, and passed through a 100-mesh sieve to obtain an organically modified bentonite.

[0019] Will make (C 16 h 33 N + BrCH 2 CHOH) 2 Add 0.2 g of modified organic bentonite to 200 mL of 200 mg / L phenol solution and mix. The temperature was 25°C, and the rotation speed was 190r / min. The adsorption was shaken for 6h, and the supernatant was taken to measure the remaining phenol concentration by UV-Vis spectrophotometry. The calculated phenol removal rate was 86%.

Embodiment 3

[0021] In a 1000mL beaker, add 5g of montmorillonite dried and crushed through a 100-mesh sieve and 500mL of 0.0001mol / L Gemini surfactant (C 18 h 37 N + BrCHOH) 2 The solution was magnetically stirred at 70°C for 36 hours, centrifuged to obtain a solid product, dried at 80°C, ground, and passed through a 100-mesh sieve to obtain an organically modified montmorillonite.

[0022] Will make (C 16 h 33 N + BrCH 2 CHOH) 2 Add 0.3 g of modified organic montmorillonite to 200 mL of 200 mg / L phenol solution and mix. The temperature was 25°C and the rotational speed was 190r / min. The adsorption was oscillated for 6h, centrifuged, and the supernatant was taken to measure the remaining phenol concentration by UV-Vis spectrophotometry. The calculated phenol removal rate was 88%.

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Abstract

The invention discloses a method for preparing organic modified clay by using a gemini quaternary ammonium salt surfactant and expansive clay. The organic modified clay is used for removing organic pollutants from wastewater. The preparation method concretely comprises the following steps: mixing the expansive clay obtained after drying, crushing and sieving with a 20-100 mesh sieve with a gemini quaternary ammonium salt surfactant solution according to a solid / liquid ratio of 1:100-1:300, stirring at 60-80DEG C for 18-48h, centrifuging to obtain a product, drying the product at 80DEG C, grinding, and sieving by a 100 mesh sieve to prepare organic modified montmorillonite. Compared with traditional surfactant modified organic clay, the gemini quaternary ammonium salt surfactant organic modified clay has the advantages of high adsorption efficiency of the organic pollutants and substantially enhanced adsorption ability, and can be used in treatment of the organic pollutants in wastewater, or in refuse dump, oil depots, underground water areas and other occasions as a cutoff wall addition material.

Description

technical field [0001] The invention discloses a method for preparing organically modified clay for removing organic pollutants in waste water, belonging to the field of preparation of inorganic solid materials. Background technique [0002] The use of organoclay minerals to remove organic pollutants is one of the fields with the most application potential and the most active research. There are exchangeable cations between natural expansive clay layers, and long-chain alkyl quaternary ammonium salt surfactants can be adsorbed between clay layers through simple ion exchange and hydrophobic supramolecular forces, making the clay mineral layers change from hydrophilic to hydrophobic , to obtain a composite material with small pore size, large specific surface area, high micropore volume, good heat resistance, high-concentration electrolyte resistance, and strong surface acidity. The adsorption capacity of organic pollutants in aqueous solution can be increased by dozens of tim...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/22B01J20/30C02F1/28
Inventor 齐丽云孙晨雅高艳丽
Owner JIANGNAN UNIV
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