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Adsorption film mixing three metallic oxides and preparation method thereof and method for measuring fluorinion based on gradient diffusion thin film technology

An adsorption film and oxide technology, applied in the direction of alkali metal oxides/hydroxides, alkali metal compounds, chemical instruments and methods, etc., can solve the problems of limitation of fluoride ion detection means and difficulty in achieving accurate measurement, etc., and reach the scope of use The effect of wide, good adsorption characteristics

Active Publication Date: 2016-03-09
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to solve the problem that the existing fluoride ion detection means are limited by many factors and difficult to achieve accurate measurement

Method used

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  • Adsorption film mixing three metallic oxides and preparation method thereof and method for measuring fluorinion based on gradient diffusion thin film technology
  • Adsorption film mixing three metallic oxides and preparation method thereof and method for measuring fluorinion based on gradient diffusion thin film technology
  • Adsorption film mixing three metallic oxides and preparation method thereof and method for measuring fluorinion based on gradient diffusion thin film technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] First, particles of mixed oxides of three metals (iron, aluminum and cerium) are prepared:

[0057] (1) Dissolve 2.78g of ferrous sulfate, 4.86g of aluminum sulfate, 4.04g of cerium sulfate in 100mL of pure water to prepare a mixed solution, wherein the mixed solution contains 0.1mol / L iron ion, 0.2mol / L aluminum ion and 0.1mol / L cerium ion.

[0058] (2) Regulate the pH value of the mixed solution of step (1) with saturated sodium hydroxide solution and keep stirring, until the pH value reaches 8, collect a large amount of yellowish-brown precipitate that occurs, and repeatedly wash the yellow precipitate with pure water, and remove it in 3577g Centrifuge for 10 min under the condition, measure the pH value of the supernatant, skim off the supernatant, repeat the above operation until the pH value of the supernatant drops to 6.5.

[0059] (3) Dry the cleaned brownish-yellow precipitate in an oven at 65°C for 24 hours, then calcinate it in a muffle furnace at 300°C for...

Embodiment 2

[0079] A kind of preparation method of the adsorption film that mixes three kinds of metal oxides in the present embodiment is basically the same as embodiment one, the difference is: the solution that prepares mixed three kinds of metal oxide particles is by dissolving 5.56g ferrous sulfate, 9.72g sulfuric acid Aluminum, prepared by adding 8.08g of cerium sulfate particles to 100mL of pure water, wherein the solution contains 0.2mol / L iron ion, 0.4mol / L aluminum ion and 0.2mol / L cerium ion. A method for measuring fluoride ions in a water environment based on gradient diffusion film technology is basically the same as in Example 1, except that this example is simulated wastewater with different pH values ​​prepared in the laboratory (the pH range is 3.15 to 9.12). The total volume is 2L, the fluoride ion content is 1mg / L, and the nitrate ion content is 0.01mol / L. The implementation steps are: place the prepared DGT device in the prepared simulated wastewater for 4 hours, then ...

Embodiment 3

[0083] The preparation method of a kind of adsorption film that mixes three kinds of metal oxides in the present embodiment is basically the same as embodiment one, the difference is: the solution that prepares mixed three kinds of metal oxide particles is by dissolving 1.91g ferrous chloride, 4.01g Aluminum chloride, prepared by adding 4.23g of cerium chloride particles to 100mL of pure water, wherein the solution contains 0.15mol / L iron ion, 0.3mol / L aluminum ion and 0.15mol / L cerium ion. A method for measuring fluoride ions in a water environment based on gradient diffusion film technology is basically the same as in Example 1, the difference is that this example is a laboratory preparation of different ionic strengths (0~200mmol / LNO 3 - ) simulated wastewater, the total volume of wastewater is 2L, the fluoride ion content is 1mg / L, and the pH value is 6. The determination steps are basically the same as in Example 2, except that the amount of sodium hydroxide eluent is 5 ...

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Abstract

The invention discloses an adsorption film mixing three metallic oxides and a preparation method thereof and a method for measuring fluorinion based on a gradient diffusion thin film technology. The adsorption film takes three oxides, namely iron, aluminum and cerium as adsorption materials, and the three oxides are uniformly dispersed into a polyacrylamide solution to form a gel and the gel is heated to form an adsorption film. The adsorption film, a diffusion film and a filter membrane are overlapped to assemble a DGT device, and the DGT device is placed into water body and sediments to realize in situ testing of fluorinion and the subcentimetre high resolution detection of fluorinion distributed in the water body and sediments. The adsorption film prepared by adopting the preparation method disclosed by the invention is large in adsorption capacity, long in retention time and easily available in materials; compared with the traditional fluorinion selective electrode method, the fluorinion in situ test method based on the gradient diffusion thin film technology is wide in application range and the result has more representativeness.

Description

Technical field: [0001] The invention relates to the field of analysis and evaluation of gradient diffusion film technology in water and sediment media, specifically, an adsorption film mixed with three metal oxides and its preparation method and the determination of water body and sediment based on gradient diffusion film technology The method of fluoride ion in the substance. Background technique: [0002] Fluorine is widely distributed in the natural environment, is an essential element for animal growth, and is an important part of human bones and teeth (Meenakshi, et al., J. Hazard. Mater., 2006, 137, 456-463.). When the human body's intake is lower than 0.5mg / L, it will cause dental caries, enamel loss and even affect the growth of bones; when the intake is higher than 1mg / L, it will cause many health problems, such as skeletal fluorosis, Dental fluorosis, bone and joint stiffness, and even lead to paralysis or nerve damage when the intake is higher than 4mg / L (AminiM...

Claims

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Application Information

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IPC IPC(8): B01J20/08B01J20/28B01J20/30C02F1/28C02F1/58G01N27/26C02F101/14
CPCB01J20/0207B01J20/0229B01J20/08G01N27/26C02F1/288C02F1/58B01J20/28033B01J2220/4806B01J2220/42C02F2101/14
Inventor 罗军周春羊管冬兴
Owner NANJING UNIV
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