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Preparation method of porous composite material for removal of fluorine ions from water

A porous composite material, fluoride ion technology, applied in chemical instruments and methods, water pollutants, silicon compounds, etc., can solve the problems of large specific surface area, less research on performance, etc., achieving less coating amount and easy operation of the process flow , the effect of low cost

Inactive Publication Date: 2015-12-09
CHANGZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Foam glass, also known as glass pumice, is made of waste glass as the main raw material, adding a foaming agent, finely pulverized and evenly mixed into batch materials, and then sintered and foamed to form a porous glass phase material. Foam glass has a porous structure and a specific surface area Large, no harmful substances, suitable as an adsorption material, and low in price, but there are few domestic researches on the performance of nitrogen and fluoride adsorption on rare earth-loaded lanthanum foam glass. This method provides a new idea for the application of rare earth in water treatment

Method used

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  • Preparation method of porous composite material for removal of fluorine ions from water
  • Preparation method of porous composite material for removal of fluorine ions from water
  • Preparation method of porous composite material for removal of fluorine ions from water

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preparation example Construction

[0018] A specific embodiment of the preparation of a porous composite material for removing fluoride ions in water is as follows:

[0019] (1) Preparation method 1: dissolving lanthanum nitrate hexahydrate (or lanthanum triacetate, or lanthanum trichloride) in distilled water to make a solution, the concentration of lanthanum is 0.5-6mol L -1 . The foam glass (average pore diameter 0.5 ~ 2mm, porosity 40 ~ 80%) with a particle diameter of 10 ~ 20mm is dropped into the solution according to the ratio of mass ratio lanthanum trioxide / foam glass = 0.005 ~ 0.09 / 1, Use ammonia water to adjust the pH, so that the pH value of the system is between 8 and 9; (or use a concentration greater than 2mol L -1 After the foam glass is impregnated with lanthanum nitrate hexahydrate solution, it is fumigated to alkaline with ammonia water, and this method is suitable for industrialized mass production). Dry the foam glass together with the solution in an oven (in the immersion fumigation meth...

Embodiment 1

[0028] Embodiment 1: The content of lanthanum oxide is 3~9% the preparation method of porous composite material, and specific implementation method is as follows:

[0029] Raw material: Foam glass 10~20mm

[0030] Lanthanum nitrate hexahydrate, ammonia water

[0031] Instrument: Fluoride ion selective electrode

[0032] The lanthanum oxide loading rate of table 1 cellular glass

[0033]

[0034] The sintering temperature of the foam glass loaded with lanthanum is 580°C and the holding time is 60 minutes, and 600mL of high fluorine-containing water is treated, and the fluorine content is 32mg L -1 . The treatment time is 2 hours, and the fluoride ion content is measured every half hour. The result is as figure 1 As shown, the best fluorine effect is that the content of lanthanum oxide is 7%, and the foam glass without lanthanum oxide has no effect on the removal of fluoride ions. Depend on Figure 5 It can be seen from the scanning electron microscope pictures of the ...

Embodiment 2

[0035] Example 2: Porous Composite Material Circulating Treatment of Highly Fluorinated Water

[0036] Raw material: Foam glass 10~20mm

[0037] Lanthanum nitrate hexahydrate, ammonia water

[0038] Instrument: Fluoride ion selective electrode

[0039] Lanthanum oxide load rate of table 2 cellular glass

[0040]

[0041] The sintering temperature of the foam glass loaded with lanthanum is 580°C and the holding time is 60 minutes. The 3% and 7% porous composite materials are respectively treated with 600mL high fluoride water for 2 hours, and the fluoride ion content is measured every half hour. The foam glass is washed with distilled water and then baked. After drying, treat 600mL high fluoride water respectively for 2 hours, and measure the fluoride ion content in half an hour. The result is as figure 2 Shown: The fluoride removal efficiency is greatly reduced within 2 hours, but the fluoride ion content is 18mg / L and 5mg / L after being placed for one day.

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Abstract

The invention relates to a material for removal of fluorine ions from drinking water, or deep defluorination of fluorine-containing wastewater. The material is prepared by coating the surface of porous foam glass with a layer of rare earth element lanthanum's oxide. The material can be used as the filler of a water treatment tower and can effectively reduce the concentration of fluorine ions in water. By using a tower type fluidized bed, the fluorine ion concentration can be reduced to 0.1ppm. The treatment can be used for regeneration and recycling.

Description

technical field [0001] The invention relates to advanced treatment of drinking water and fluorine-containing waste water. In particular, it refers to a highly efficient fluorine ion adsorption material in water prepared by using waste inorganic glass foamed with calcium carbonate as a carrier, and a high-efficiency fluoride ion adsorption material in water, as well as a regeneration method for the material. Background technique [0002] Fluorine is one of the essential trace elements for the human body. Deficiency of fluorine can cause dental caries, and excess fluoride can cause fluorosis, skeletal fluorosis, dental fluorosis, thyroid damage, kidney damage and other diseases. WHO (World Health Organization) regards the mass concentration of fluoride in drinking water as 0.5-1.5mg / L as the optimal concentration range beneficial to the human body. my country's drinking water hygiene standard (GB5749-2006) stipulates that the mass concentration limit of fluoride is 1mg / L. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/10B01J20/28B01J20/30C02F1/28C02F101/14
Inventor 李坤胡东李政孙富兴陈俊律
Owner CHANGZHOU UNIV
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