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 a

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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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[0041] According to another aspect of the present invention, a method for preparing the above heavy metal adsorbent is also provided, such as figure 1 As shown, including the following steps:

[0042] (1) Disperse the floating nucleus uniformly in the solution of the composite polymer to obtain a dispersion, so that the mass ratio of the floating nucleus and the composite polymer in the dispersion is (1 to 5):1; the composite polymer includes The mass ratio of the modified chitosan and sodium alginate is 5:1~1:5, 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 glycans is more than 30%;

[0043] Then the dispersion liquid can be stirred at 20℃~40℃ for 3h~8h, and treated with ultrasound for 20min~40min to accelerate the removal of bubbles in the reaction solution;

[0044] (2) Drop the dispersion into 0.045M~0.9M Ca 2+ Soak in the solution for 3h-24h to co...

Example Embodiment

[0054] Example 1

[0055] (0) Preparation of raw materials

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

[0057] (0-2) Preparation of EDTA-modified chitosan: First, disperse a certain quality of EDTA solid powder in distilled water, and add a small amount of sodium hydroxide to control the pH of the solu...

Example Embodiment

[0072] Example 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 , Fly ash float beads with an average particle size of 105μm are dispersed in distilled water, and after stirring for 3 hours, the water-soluble impurities adsorbed on the surface of the fly ash float beads will be cleaned, stand still and layered, and the fly ash floating on the water will be screened out. The ash bleaching beads are dried at 50°C for later use; the sieved fly ash bleaching beads are dispersed into a 2% dilute nitric acid solution and stirred for 3 hours, then the ash bleaching beads are rinsed and acid treated with distilled water until the distilled water flowing out of washing is close to neutral , Dry at 50℃ for later use;

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

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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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