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Iron modified chitosan defluorinated particle adsorbent and preparation method thereof

A particle adsorbent, chitosan technology, applied in chemical instruments and methods, adsorbed water/sewage treatment, other chemical processes, etc., can solve the problems of low selectivity, high cost, expensive equipment, etc. The effect of small influence and high fluoride ion removal rate

Active Publication Date: 2014-10-01
北京涞澈科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The fluorine removal efficiency of the ion exchange method can be as high as 90%-95%, but the biggest disadvantage of this method is that the selectivity is low. While removing fluoride ions, it will also remove other mineral ions and introduce exchange ions
The chemical precipitation method is often used in the treatment of high-concentration (≧1000mg / L) fluorine-containing industrial wastewater, but its disadvantages are that the dosage is large, a large amount of sludge will be generated, and the concentration of fluoride ions in the effluent is mostly higher than my country's water treatment discharge standards
The coagulation-sedimentation method has the advantages of large amount of treated water, low cost, simple equipment, and relatively easy operation, but the treatment effect of this method is greatly affected by the operating conditions
Electrodialysis and membrane separation are suitable for low-concentration fluorine-containing wastewater. The treatment effect is stable, and the effluent quality can meet the national discharge standards, but the cost is high, the equipment is expensive, and it is easy to cause secondary pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Add 1.25g of chitosan to the beaker, add 50ml of 2.0% (v / v) acetic acid solution, stir and dissolve for 30min, then add 5g of ferric chloride hexahydrate, stir until completely dissolved, let it stand for 0.5h, and use a syringe Add the solution dropwise to a 6.25% (v / v) ammonia solution, let it stand for 1 hour, wash it with deionized water until neutral, and dry it in an oven at 50°C for 12 hours to obtain iron-modified chitosan defluoride particles Adsorbent.

[0025] Add 50 mL of 10 mg / L fluoride ion solution into a 200 ml Erlenmeyer flask, weigh 0.25 g of the above-prepared iron-modified chitosan fluoride-removing granular adsorbent, shake it in an air bath constant temperature oscillator at 30 °C and 150 rpm for 6 h, Take the supernatant, filter it through a 0.45 μm membrane, and measure the concentration of fluoride ion by spectrophotometry with a fluorine reagent. The removal rate can reach 90.26%, and the adsorption capacity can reach 1.8522 mg / g.

[0026] Add...

Embodiment 2

[0029] Add 1.20g of chitosan to the beaker, add 50ml of 2.1% (v / v) acetic acid solution, stir and dissolve for 30min, then add 4g of ferric chloride hexahydrate, stir until completely dissolved, let it stand for 0.4h, and use a syringe Add the solution dropwise to 6.0% (v / v) ammonia solution, let stand for 1.2h, wash with deionized water until neutral, and dry in an oven at 45°C for 12h to obtain iron-modified chitosan defluorination particle adsorbent.

[0030] Add 50 mL of 10 mg / L fluoride ion solution into a 200 ml Erlenmeyer flask, weigh 0.25 g of the above-prepared iron-modified chitosan fluoride-removing granular adsorbent, shake it in an air bath constant temperature oscillator at 30 °C and 150 rpm for 6 h, Take the supernatant, filter it through a 0.45 μm membrane, and measure the fluoride ion concentration by spectrophotometry with a fluorine reagent. The removal rate can reach 90.18%, and the adsorption capacity can reach 1.8510 mg / g.

[0031] Add 50mL10mg / L fluorid...

Embodiment 3

[0034] Add 1.30g of chitosan in the beaker, add 50ml of 1.9% (v / v) acetic acid solution, stir and dissolve for 30min, then add 5.5g of ferric chloride hexahydrate, stir until completely dissolved, leave it for 0.6h, use The solution was added dropwise into a 6.5% (v / v) ammonia solution with a syringe, allowed to stand for 0.8h, washed with deionized water until neutral, and dried in an oven at 55°C for 12h to obtain iron-modified chitosan. Fluorine particle adsorbent.

[0035] Add 50 mL of 10 mg / L fluoride ion solution into a 200 ml Erlenmeyer flask, weigh 0.25 g of the above-prepared iron-modified chitosan fluoride-removing granular adsorbent, shake it in an air bath constant temperature oscillator at 30 °C and 150 rpm for 6 h, Take the supernatant, filter it through a 0.45 μm membrane, and measure the fluoride ion concentration by spectrophotometry with a fluorine reagent. The removal rate can reach 90.13%, and the adsorption capacity can reach 1.8315 mg / g.

[0036]Add 50mL...

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Abstract

The invention discloses an iron modified chitosan defluorinated particle adsorbent and a preparation method thereof. The preparation method comprises the following steps: step 10, chitosan is dissolved in an acetum at the indoor temperature and stirred until the chitosan is completely dissolved in the acetum to obtain a chitosan solution; step 20, hexahydrate ferric trichloride is added into the chitosan solution and stirred to be uniform, and the mixed solution is put to be stationary; step 30, the mixed solution is added into ammonia water dropwise, put to be stationary, washed by deionized water to be neutral and dried to obtain the particle adsorbent. According to the invention, the method is adopted, so that not only is the prepared iron modified chitosan defluorinated particle adsorbent high in the removal rate of fluorinion and large in adsorbing capacity, but also the removal rate of fluorinion is less influenced by temperature and pH.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to an iron-modified chitosan defluoridation granular adsorbent and a preparation method thereof. Background technique [0002] Fluorine is one of the trace chemical elements widely distributed in the natural environment and closely related to human health. It is an essential component for maintaining the normal development of bones in the human body, and plays an important role in promoting the formation of teeth and bones. However, excessive intake of fluoride is also very harmful to humans, animals and plants. The World Health Organization stipulates that the concentration range of fluoride in drinking water is 1.0mg / L-1.5mg / L. Long-term use of high-fluoride water can cause dental fluorosis and bone disease, and even lead to nerve damage. [0003] Fluoride pollution in surface water and groundwater is common in Africa, India and Northeast China. Fluoride in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/30C02F1/28C02F101/14
Inventor 陈男冯传平张静
Owner 北京涞澈科技发展有限公司
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