Compound heavy metal adsorbent and preparation method thereof

An adsorbent and heavy metal technology, applied in the field of composite heavy metal adsorbent and its preparation, can solve the problems of limited adsorption capacity, influence adsorption efficiency, etc., and achieve the effects of reducing sensitivity, improving adsorption performance, and facilitating recycling.

Active Publication Date: 2017-06-13
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

[0003] Patent document CN105709699A discloses a soil heavy metal adsorbent and its preparation method. By co-precipitating organic polymers and nano-inorganic compounds on the outer surface of the floating core, a heavy metal adsorbent that is easily separated from the soil is obtained; however, the patent document uses The organic polymer is humate, chitosan or alginate, which has limited adsorption capacity, which affects the adsorption efficiency

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  • Compound heavy metal adsorbent and preparation method thereof
  • Compound heavy metal adsorbent and preparation method thereof
  • Compound heavy metal adsorbent and preparation method thereof

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preparation example Construction

[0041] According to another aspect of the present invention, also provide the preparation method of above-mentioned heavy metal adsorbent, such as figure 1 shown, including the following steps:

[0042] (1) Evenly disperse the floating core in the solution of the composite polymer to obtain a dispersion, so that the mass ratio of the floating core and the composite polymer in the dispersion is (1~5):1; the composite polymer includes Modified chitosan and sodium alginate with a mass ratio of 5:1 to 1:5, the modified group of the modified chitosan is a small molecule chelating agent, and the shell substituted by the small molecule chelating agent The proportion of amino groups of polysaccharides is more than 30%;

[0043] Then the dispersion can be stirred at 20°C-40°C for 3h-8h, and ultrasonically treated for 20min-40min to accelerate the removal of air bubbles in the reaction solution;

[0044] (2) Drop the dispersion liquid into 0.045M~0.9M Ca 2+ solution, and soaked for 3...

Embodiment 1

[0055] (0) Preparation of raw materials

[0056] (0-1) Activation of floating core: according to the ratio of solid-liquid ratio (w / w) of 1:200, the average density is 0.30mg / cm 3 , The hollow glass microspheres with an average particle size of 40 μm are dispersed in distilled water, after stirring for 3 hours, the water-soluble impurities adsorbed on the surface of the hollow glass microspheres are cleaned, and the hollow glass microspheres that can float on the water surface are screened out. , dry at 50°C for later use; disperse the screened hollow glass microspheres into 0.1M HCl aqueous solution and stir for 10 hours, then rinse the acid-treated hollow glass microspheres with distilled water until the distilled water flowing out of washing is close to neutral, and then dry them at 50°C Obtain activated hollow glass microspheres;

[0057] (0-2) Preparation of EDTA-modified chitosan: First, disperse a certain amount of EDTA solid powder in distilled water, and control the ...

Embodiment 2

[0073] (0) Preparation of raw materials

[0074] (0-1) Activation of floating core: according to the ratio of solid-liquid ratio (w / w) of 1:200, the average density is 0.45mg / cm 3 1. Fly ash floating beads with an average particle size of 105 μm are dispersed in distilled water. After stirring for 3 hours, the water-soluble impurities adsorbed on the surface of the fly ash floating beads are cleaned, and the powdered coal that can float on the water is screened out. Ash floating beads, dry at 50°C for later use; disperse the screened fly ash floating beads into 2% dilute nitric acid solution and stir for 3 hours, then rinse the acid-treated fly ash floating beads with distilled water until the distilled water flowing out of the washing is close to neutral , dried at 50°C for later use;

[0075] (0-2) Preparation of DTPA-modified chitosan: Weigh a certain amount of DTPA solid powder and disperse it in distilled water, add a small amount of sodium hydroxide solid in batches, co...

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Abstract

The invention discloses a compound heavy metal adsorbent. The compound soil heavy metal adsorbent comprises a floating core and a compound high molecule coating the floating core, wherein the mass ratio of the floating core to the compound high molecule is (1-5):1; the compound high molecule comprises a first polymer and a second polymer of which the mass ratio is (5:1)-(1:5); the first polymer is alginic acid or calcium alginate; the second polymer is modified chitosan; a modification group of the modified chitosan is small molecule chelator; the small molecule chelator has a carboxyl group and at least two chelation groups; the amino group ratio of the small molecule chelator substituted chitosan is above 30%; and the remaining amino groups in the chitosan and hydroxyl groups of the first polymer are crosslinked through dialdehyde molecules. According to the invention, the soil heavy metal adsorbent is prepared by compounding the modified chitosan modified with the small molecule chelator with the alginic acid / calcium alginate and the floating core, thereby improving the adsorbability of the soil heavy metal adsorbent.

Description

technical field [0001] The invention belongs to the technical field of soil heavy metal pollution control and restoration, and more specifically relates to a composite heavy metal adsorbent that can be used in soil and a preparation method thereof. Background technique [0002] In the past 30 years, my country's economy has developed rapidly, and the resulting environmental pollution has become increasingly serious, especially the heavy metal pollution in farmland and other soils. Unlike organic pollutants, heavy metals will not be naturally decomposed into non-toxic substances under the action of microorganisms, etc.; and heavy metal adsorbents can separate heavy metals from water or soil to avoid long-term accumulation in the ecological environment and pass through the food chain. transmission, and ultimately pose a threat to human health. [0003] Patent document CN105709699A discloses a soil heavy metal adsorbent and its preparation method. By co-precipitating organic p...

Claims

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Application Information

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IPC IPC(8): B01J20/24B01J20/32
CPCB01J20/02B01J20/10B01J20/24B01J20/3282
Inventor 彭红王琳玲陈静黄炎俊陆晓华王洪李鸿博
Owner HUAZHONG UNIV OF SCI & TECH
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