Preparation method of lanthanum-modified activated carbon and method for removing fluorine ions in water

A technology for activated carbon and water removal, applied in chemical instruments and methods, water pollutants, water/sewage treatment, etc., can solve the problems of secondary pollution, limited adsorption effect, poor stability of activated alumina, etc.

Inactive Publication Date: 2021-01-26
CHINA UNIV OF MINING & TECH (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, activated alumina and carbon materials are widely used, but the stability of activated alumina is poor, which is prone to secondary pollution, and the adsorption effect of traditional carbon materials is limited.

Method used

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  • Preparation method of lanthanum-modified activated carbon and method for removing fluorine ions in water
  • Preparation method of lanthanum-modified activated carbon and method for removing fluorine ions in water
  • Preparation method of lanthanum-modified activated carbon and method for removing fluorine ions in water

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preparation example Construction

[0025] This embodiment provides a method for preparing lanthanum-modified activated carbon, including:

[0026] Immerse activated carbon in a lanthanum salt solution with a concentration of 0.05-0.15 mol / L, adjust the pH value at 4-12, and then react at 25°C-55°C.

[0027] The lanthanum-modified activated carbon prepared by the method can effectively absorb and remove fluorine in water. The surface of activated carbon is rich in oxygen-containing functional groups such as hydroxyl and carboxyl groups, and activated carbon has a large specific surface area and pore volume. By modifying activated carbon with lanthanum, lanthanum can be loaded on the surface of activated carbon. Metal lanthanum can increase the metal cations on the surface of activated carbon and improve the adsorption of anionic pollutants such as fluoride ions. The atomic radius of lanthanum element is large, and it is easy to lose the electrons of s, 5d or 4f' in the outer layer. Lanthanum element has a very ...

Embodiment 1

[0094] Provide a kind of preparation method of lanthanum modified coal-based activated carbon, comprising:

[0095] (1) First, pretreat the activated carbon raw carbon, including grinding and sieving, and screen out activated carbon with a particle size of 400 mesh to 200 mesh (37 to 75 microns), and then wash it with ethanol and ultrapure water until medium Finally, put it in a blast drying oven and dry it at 105°C for 10h.

[0096] (2) Get 2.0 g of the pretreated activated carbon obtained in step (1), soak it in the lanthanum nitrate solution of a certain concentration (0.05~0.15mol / L) of 100ml, secondly, at a certain temperature (25 DEG C~55 DEG C) ), adjust the pH to (4-12) by adding 0.001-1.0mol / L NaOH (or HCl) solution dropwise, and react for a certain period of time (6h-18h) at a rotational speed of 400rpm.

[0097] (3) Then cool the mixed solution obtained in step (2) to room temperature, wash off unreacted lanthanum nitrate with alcohol and deionized water and make t...

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Abstract

The invention relates to the field of wastewater treatment, in particular to a preparation method of lanthanum modified activated carbon and a method for removing fluorine ions in water. The method comprises the following steps: immersing activated carbon in a lanthanum salt solution with a concentration of 0.05-0.15 mol / L, adjusting a pH value to 4-12, and conducting reacting at 25-55 DEG C. As the activated carbon is subjected to lanthanum modification, lanthanum loading can be performed on the surface of the activated carbon. The metal lanthanum can increase metal cations on the surface ofthe activated carbon and improve adsorption of anion pollutants such as fluorine ions and the like. The lanthanum element is large in atomic radius and easily loses electrons of an outer layer s, 5d or 4f'; the lanthanum element has very high affinity to fluorine ions with high electronegativity; and according to the Lewis acid-base theory, La<3+> is typical Lewis acid, F<-> is typical Lewis base,and La<3+> and F<-> form coordination covalent bond combination through coordination effect. The lanthanum-modified activated carbon can effectively improve the adsorption efficiency of an activatedcarbon adsorbent on fluorine.

Description

technical field [0001] The application relates to the field of wastewater treatment, in particular, to a method for preparing lanthanum-modified activated carbon and a method for removing fluoride ions in water. Background technique [0002] The toxicity of fluoride is related to its reactivity and structure. Soluble fluoride, such as the most common NaF, has certain toxicity. Drinking water that contains excessive fluoride ions poses a threat to human health. Cumulative fluorosis such as dental fluorosis and skeletal fluorosis caused by drinking high-fluoride water for a long time is the most widely affecting endemic disease in the world. Excessive intake of fluoride also has a significant impact on children's IQ. The published drinking water hygiene standards (GB5749-2006) and groundwater quality standards (GB / T14848-2017) clearly stipulate the concentration limit of fluoride ions, namely 1.0mg / L. Therefore, it is imminent to study the removal technology of fluoride ion ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/30C02F1/28C02F101/14
CPCB01J20/0207B01J20/20C02F1/281C02F1/283C02F2101/14
Inventor 侯嫔林智炜刘昊张南南张春晖刘彦君
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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