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Iron-based composite absorbing agent and preparation method thereof

A composite adsorption, iron-based technology, applied in chemical instruments and methods, other chemical processes, etc., can solve the problem of small adsorption capacity and achieve the effect of high fluorine adsorption capacity

Inactive Publication Date: 2012-12-19
TSINGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0013] Aiming at the common defect of small adsorption capacity of existing adsorbents, the technical problem to be solved by the present invention is to improve the adsorption capacity of the adsorbent, especially the adsorption capacity for fluorine ions

Method used

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  • Iron-based composite absorbing agent and preparation method thereof
  • Iron-based composite absorbing agent and preparation method thereof
  • Iron-based composite absorbing agent and preparation method thereof

Examples

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preparation example Construction

[0040] The present invention also provides a method for preparing the above iron-based composite adsorbent. In a preferred embodiment, the method includes the following steps:

[0041] (1) Prepare an aqueous solution of polyvinyl alcohol;

[0042] (2) Add iron salt or iron salt solution to the aqueous solution obtained in step (1) at room temperature, dissolve and stir evenly, to obtain an iron salt polyvinyl alcohol aqueous solution;

[0043] (3) Under the condition of stirring, add an alkali solution to the iron salt polyvinyl alcohol aqueous solution obtained in step (2) until the pH of the solution is about 6.5 to about 11.0, and then stir for a period of time;

[0044] (4) While stirring, continue to add other metal salt solutions, and then add alkali solution until the pH of the solution is about 5.0 to about 8.0, and then stir for a period of time, wherein the other metals are selected from lanthanide rare earth metals and zirconium (Zr ) At least one of;

[0045] (5) The precip...

Embodiment 1

[0068] Example 1 Preparation of adsorbent

[0069] Weigh 50 grams of PVA-1750, add 600 milliliters of deionized water to swell for 6 hours, and then heat under mechanical stirring and maintain a constant temperature of 90°C. After 3 hours, all PVA is dissolved. The PVA solution was cooled and the volume was adjusted to 1000 ml to obtain a 5% PVA-1750 stock solution. Mix 64ml of 1M ferric chloride solution with 32ml of 1M ferrous sulfate solution at room temperature, add 4ml of PVA stock solution and stir evenly to prepare 100ml of 0.96M iron salt mixed solution containing 0.2% (wt / v) PVA-1750; In this case, add 5M sodium hydroxide solution to the solution, and measure the pH value of the solution in real time with a digital display pH meter. As the amount of sodium hydroxide added increases, precipitation begins to occur. Continue to add sodium hydroxide solution and the pH rises until the mixed solution is precipitated When the pH is 9.0, stop adding sodium hydroxide solution a...

Embodiment 2

[0070] Example 2 Preparation of adsorbent

[0071] Similar to Example 1, mix 64ml of 1M ferric sulfate solution with 32ml of 1M ferrous sulfate solution at room temperature, add 4ml of PVA-1750 stock solution and stir evenly to prepare 0.96M iron salt containing 0.2% (wt / v) PVA Mixed solution 100ml; add 5M sodium hydroxide solution to the solution under stirring, and measure the pH value of the solution in real time with a digital display pH meter. As the amount of sodium hydroxide added increases, precipitation begins to occur, continue to add sodium hydroxide solution, pH Rise until the pH of the precipitation mixture is 9.0, stop adding sodium hydroxide solution, continue to stir the suspension for 10 minutes; then add 50ml of 0.5M cerium sulfate solution to the suspension, and add a small amount of sodium hydroxide under stirring Solution, adjust the pH value of the suspension to 5.9, continue to stir the suspension for 30 minutes; centrifuge the above suspension at 4000 rpm ...

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Abstract

The invention discloses an iron-based composite absorbing agent and a preparation method thereof. The iron-based composite absorbing agent comprises iron hydrated oxide, hydrated oxides of other metal and polyving akohol, wherein the other metals are at least one of lanthanide series rare earth metals and zirconium (Zr). The absorbing agent has high absorption capacity on fluorine and can effectively remove fluorinion in water especially in drinking water.

Description

Technical field [0001] The invention relates to a novel adsorbent material and a preparation method thereof, in particular to an iron-based composite adsorbent capable of effectively removing fluoride ions in water and a preparation method thereof. Background technique [0002] Drinking water is the main way the human body takes in fluoride. Excessive fluorine content in drinking water can lead to various diseases such as dental fluorosis and bone fluorosis. In severe cases, it can lead to paralysis. Therefore, both the World Health Organization (WHO) and Chinese health authorities have strict regulations on the fluorine content of drinking water. The WHO standard for fluorine content in drinking water is 0.6-1.5mg / L, and the highest fluorine content in China’s drinking water sanitation standards is 1 mg / L. [0003] The problem of excessive fluorine content in drinking water is widespread in many countries in the world, and the problem has a serious impact on China. Except for S...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/26
Inventor 桑木康之黄霞丁文明
Owner TSINGHUA UNIV
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