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Lanthanum-loaded magnetic carbon aerogel microsphere defluorination adsorbent and preparation method

A carbon airgel and adsorbent technology, applied in the field of lanthanum-loaded magnetic carbon airgel microsphere defluoridation adsorbent and its preparation, can solve the problem that the fluoride ion adsorption capacity needs to be improved, the adsorption process and equipment design are difficult, and nanometer defluorination The small size of the adsorbent and other problems achieve the effect of safe and reliable water quality, easy separation, and low quality loss

Inactive Publication Date: 2014-03-19
BEIJING FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006](1) The adsorption capacity of the fluoride removal adsorbent is low, resulting in the consumption of a large amount of adsorbent during the adsorption process;
[0007](2) Some nano-scale fluoride removal adsorbents are small in size, and it is not easy to separate solid and liquid after the adsorption is completed, so there are difficulties in the design of adsorption process and equipment;
[0009](4) Some formed adsorbents have poor strength and are easily broken; , the kinetic energy of the water in the treatment process and the instantaneous high-speed water flow function in the recoil process lead to the problem of broken adsorbent particles. On the one hand, it will lead to the loss of adsorbent, and the system cannot operate effectively for a long time; The release leads to drinking water safety hazards;
[0010](5) Some molding processes and molding materials contain harmful substances, which cannot guarantee the safety of drinking water
However, the above-mentioned methods are relatively tedious, and the adsorption capacity of fluoride ions needs to be improved.

Method used

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  • Lanthanum-loaded magnetic carbon aerogel microsphere defluorination adsorbent and preparation method

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Embodiment 1

[0037] The lanthanum-loaded magnetic carbon airgel microsphere fluorine-removing adsorbent and the preparation method comprise the following steps:

[0038] 1. Preparation of carbon airgel microspheres

[0039] Dissolve resorcinol, formaldehyde, and anhydrous sodium carbonate in an appropriate amount of distilled water at a molar ratio of 1:2:0.01, and stir to dissolve to obtain a hydrosol. Transfer the dissolved solution to the dispersed phase cyclohexane solution containing SPAN-80 with a volume ratio of 1:100, and stir at 120r / min at 80°C until dispersed organic wet gel particles are formed. The organic wet gel particles obtained by filtration and separation were soaked in acetone for 3 days, and then placed in a fume hood to dry naturally to constant weight to obtain xerogel microspheres. 2 Carbonized airgel microspheres were obtained by carbonization and cracking at 850° C. for 5 hours under protection. The carbon airgel microspheres have a particle size of 40-60 μm and...

Embodiment 2

[0047] The lanthanum-loaded magnetic carbon airgel microsphere fluorine-removing adsorbent and the preparation method comprise the following steps:

[0048] 1. Preparation of carbon airgel microspheres

[0049] Dissolve resorcinol, formaldehyde, and anhydrous sodium carbonate in an appropriate amount of distilled water at a molar ratio of 1:2:0.02, and stir to dissolve to obtain a hydrosol. Transfer the dissolved solution to the dispersed phase cyclohexane solution containing SPAN-80 at a volume ratio of 2:100, and stir at 240 r / min at 70°C until dispersed organic wet gel particles are formed. The organic wet gel particles obtained by filtration and separation were soaked in acetone for 2 days and then placed in a fume hood to dry naturally to constant weight to obtain xerogel microspheres. 2 The carbon airgel microspheres were obtained by carbonization and cracking at 950° C. for 4 hours under protection. The carbon airgel microspheres have a particle size of 30-45 μm and a...

Embodiment 3

[0057] The lanthanum-loaded magnetic carbon airgel microsphere fluorine-removing adsorbent and the preparation method comprise the following steps:

[0058] 1. Preparation of carbon airgel microspheres

[0059] Dissolve resorcinol, formaldehyde, and anhydrous sodium carbonate in an appropriate amount of distilled water at a molar ratio of 1:2:0.01, and stir to dissolve to obtain a hydrosol. Transfer the dissolved solution to the dispersed phase cyclohexane solution containing SPAN-80 at a volume ratio of 5:100, and stir at 480 r / min at 80°C until dispersed organic wet gel particles are formed. The organic wet gel particles obtained by filtration and separation were soaked in acetone for 3 days, and then placed in a fume hood to dry naturally to constant weight to obtain xerogel microspheres. 2 Carbonized airgel microspheres were obtained by carbonization and cracking at 1050° C. for 3 hours under protection. The carbon airgel microspheres have a particle size of 20-32 μm and...

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Abstract

The invention provides a lanthanum-loaded magnetic carbon aerogel microsphere defluorination adsorbent and a preparation method. The method comprises the following steps: 1) adding carbon aerogel microspheres prepared by an inverse emulsion polymerization method in a ferric salt-containing solution, and preparing a magnetic Fe3O4-loaded binary mixture by a liquid-phase chemical precipitation method; 2) adding the magnetic loaded mixture in a lanthanum saline solution, standing, and preparing a ternary mixture; and 3) drying and calcining the ternary mixture, and preparing the microsphere adsorbent for defluorination. The microspheres prepared by the method provided by the invention has the maximum adsorption capacity of 113.5 mg / g, simple in recycling, and capable of being easily separated by adding magnets, thus omitting a cumbersome and energy-consuming suction-filtration separation or centrifugal separation process; and the microspheres are high in strength, breakage-free in long-time use, less in mass loss, free from dissolution and secondary pollution problem, safe and reliable, and suitable for being used for a long time and in cases with a high water stream pressure.

Description

technical field [0001] The invention belongs to the technical field of adsorption materials, in particular to a fluorine-removing adsorbent and a preparation method of lanthanum-loaded magnetic carbon airgel microspheres. Background technique [0002] Fluorine is one of the essential trace elements in the human body, and it is mainly distributed in bones and teeth in the human body. Appropriate amount of fluorine can enhance the firmness of bones, and has a certain effect on preventing dental caries. The daily intake of fluoride for adults is generally 1.0-1.5 mg, and the appropriate concentration of fluoride in drinking water is 0.5-1.0 mg / L. However, excessive intake of fluoride will damage human health, cause dental fluorosis and skeletal fluorosis, and in severe cases can cause waist and leg pain, joint stiffness, hunchback and even paraplegia, and can also cause thyroid dysfunction, kidney dysfunction, etc. . [0003] High-fluorine water is widely distributed in my c...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/28B01J20/30C02F1/28C02F1/48C02F1/58C02F101/14
Inventor 王毅力文双喜冯晶
Owner BEIJING FORESTRY UNIVERSITY