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An amphiphilic adsorption type thiol-modified nano-hydroxyapatite adsorbent and its preparation method and application

A nano-hydroxyapatite, adsorption-type technology, applied in the direction of nanotechnology, nanotechnology, nanotechnology, etc. for materials and surface science, can solve the problem of not considering the interaction between heavy metals and rare earth elements, and not suitable for the treatment of heavy metals and rare earths Element complex pollution and other problems, to achieve the effect of low engineering cost, reduce energy consumption and resource consumption, and reduce pollution treatment costs

Active Publication Date: 2021-04-27
NANJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

"CN 101613135A" discloses a method of using nano-hydroxyapatite to remove heavy metal ions in sewage. Nano-hydroxyapatite can be used to achieve adsorption and removal of heavy metal ions such as cadmium, lead, copper, etc., but it does not consider the relationship between heavy metals and The mutual influence of the coexistence of rare earth elements is not suitable for the treatment of complex pollution of heavy metals and rare earth elements

Method used

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  • An amphiphilic adsorption type thiol-modified nano-hydroxyapatite adsorbent and its preparation method and application
  • An amphiphilic adsorption type thiol-modified nano-hydroxyapatite adsorbent and its preparation method and application
  • An amphiphilic adsorption type thiol-modified nano-hydroxyapatite adsorbent and its preparation method and application

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Experimental program
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Effect test

Embodiment 1

[0035] Preparation of amphiphilic adsorption type thiol-modified nano-hydroxyapatite adsorbent:

[0036] (1) Prepare an ethanol-water mixed solution with a volume ratio of 1:3, and slowly add acetic acid buffer dropwise to adjust the pH value to 4;

[0037] (2) Take ethanol-water solution and add silane coupling agent KH-590, hydrolyze at room temperature for 30min under the condition of pH 4, and prepare 10ml KH-590 hydrolysis solution;

[0038] (3) Take ethanol-water solution preparation concentration and be 40ml nano-hydroxyapatite (n-HAP) slurry of 125g / L, ultrasonic dispersion 30min; Then add step (2) 10mL KH-590 hydrolysis solution wherein, make KH- The mass ratio of 590 to n-HAP is 1:2, stir at 60°C for 90 minutes, evaporate to dryness at 80°C; and ensure that the pH of the reaction system needs to be controlled at about 4 throughout;

[0039] (4) washing with ethanol and water for 5 times in sequence, drying in an oven at 80°C for 24 hours, cooling, and grinding to ob...

Embodiment 2

[0042] Preparation of amphiphilic adsorption type thiol-modified nano-hydroxyapatite adsorbent:

[0043] (1) Prepare an ethanol-water mixed solution with a volume ratio of 1:9, and slowly add acetic acid buffer dropwise to adjust the pH value to 4;

[0044] (2) Take ethanol-water solution and add silane coupling agent KH-590, hydrolyze at room temperature for 30min under the condition of pH 4, and prepare 10ml KH-590 hydrolysis solution;

[0045] (3) Take ethanol-water solution and prepare 40ml of nano-hydroxyapatite slurry (n-HAP) with a concentration of 125g / L, and ultrasonically disperse it for 30min; The mass ratio of 590 to n-HAP is 1:10, stirred at 60°C for 90 minutes, and evaporated to dryness at 80°C; and ensure that the pH of the reaction system needs to be controlled at about 4 throughout;

[0046] (4) washing with ethanol and water for 5 times in sequence, drying in an oven at 80°C for 24 hours, cooling, and grinding to obtain the adsorbent;

[0047] (5) The prepa...

Embodiment 3

[0049] Preparation of amphiphilic adsorption type thiol-modified nano-hydroxyapatite adsorbent:

[0050] (1) Prepare an ethanol-water mixed solution with a volume ratio of 1:3, and slowly add acetate buffer dropwise to adjust the pH value to 4.

[0051] (2) Take ethanol-water solution and add silane coupling agent KH-590, hydrolyze at room temperature for 30min under the condition of pH 4, and prepare 10ml KH-590 hydrolysis solution;

[0052] (3) Take ethanol-water solution to prepare 40ml nano-hydroxyapatite slurry with a concentration of 125g / L, and ultrasonically disperse it for 30min; The mass ratio is 1:5, stirred at 60°C for 90 minutes, evaporated to dryness at 80°C; and ensure that the pH of the reaction system needs to be controlled to be around 4 throughout the process;

[0053] (4) washing with ethanol and water for 5 times in sequence, drying in an oven at 80°C for 24 hours, cooling, and grinding to obtain the adsorbent;

[0054] (5) The prepared adsorbent is drop...

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Abstract

The invention discloses an amphiphilic adsorption type thiol-modified nano-hydroxyapatite adsorbent, a preparation method and application thereof. The method mainly includes preparing KH590 hydrolysis solution and n-HAP slurry through ethanol-water solution, adding KH590 hydrolysis solution to n-HAP, stirring and evaporating to dryness to obtain product A; washing product A, drying, cooling, and grinding Prepared adsorbent. The preparation method of the present invention selects the silane coupling agent KH-590 to realize mercapto modification and grafting on the surface of n-HAP by means of silanization reaction, so as to improve the adsorption capacity of the treated n-HAP to soft acid heavy metals, so that it can absorb heavy metals and heavy metals In the case of complex pollution of rare earth elements, it has good adsorption performance, reduces energy consumption and resource consumption caused by step-by-step treatment, and effectively reduces pollution treatment costs.

Description

technical field [0001] The invention belongs to the technical field of mixed pollution control of heavy metals and rare earth elements, and in particular relates to an amphiphilic adsorption type mercapto-modified nano-hydroxyapatite adsorbent and a preparation method and application thereof. Background technique [0002] So far, China is still the country with the most abundant rare earth element resource reserves, the most complete variety and high grade, and it is also the only country in the world that can supply a large amount of rare earth products of different varieties and grades, occupying a dominant and dominant position in the world rare earth market. The large-scale mining of rare earth deposits will increase the flux of rare earth elements into the external environment, and the tailings and residues produced by the mining of rare earth mining areas are accompanied by a large number of heavy metal elements. Both of them also have strong soil adsorption capacity, p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/10C01B25/32B82Y40/00B82Y30/00C02F1/28B01J20/30C02F101/20
CPCB01J20/0285B01J20/048B01J20/103B82Y30/00B82Y40/00C01B25/327C02F1/281C02F2101/20
Inventor 魏正贵张驰谢毅梁蒋玉颖闫沐秋王慧敏贺凤至
Owner NANJING NORMAL UNIVERSITY
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