Preparation method of iron-titanium oxide defluorination adsorbent

A technology of iron oxides and oxides, applied in chemical instruments and methods, adsorption of water/sewage treatment, water pollutants, etc., can solve the problems of acidic pH range, harmful ion dissolution, high cost of adsorbents, etc. Mild conditions, simple and easy-to-control preparation method, and high fluoride removal efficiency

Pending Publication Date: 2016-12-14
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The present invention aims to solve the common problems of activated alumina, activated carbon, iron oxide and other fluorine removal adsorbents widely used at present, such as small adsorption capacity, serious dissolution of harmful ions, acidic pH range of application, etc., and the latest research of titanium and rare earth metals The preparation process of the oxides is complicated, the conditions are harsh, and the cost of the adsorbent is high, so a kind of iron-titanium oxide is provided

Method used

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  • Preparation method of iron-titanium oxide defluorination adsorbent
  • Preparation method of iron-titanium oxide defluorination adsorbent

Examples

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Effect test

Embodiment 1

[0026] Example 1, preparation of iron-titanium oxide fluorine removal adsorbent

[0027] Prepare 200mL of ferrous sulfate and titanium sulfate mixed solution, wherein the iron ion concentration is 0.2mol / L, the titanium ion concentration is 0.2mol / L, under stirring state, add 12.5(wt)% ammonia water, when the pH value end point reaches Stop joining at 5 o'clock. After standing still for 48 hours, the precipitate generated by the reaction was washed with deionized water until the pH value of the effluent was 7, filtered, and dried at 80° C. to constant weight. The dried product was ground to obtain a fluorine-removing adsorbent. When the pH of the aqueous solution is 7, the saturated adsorption capacity of the adsorbent for fluorine in water reaches 60.0 mg / g.

Embodiment 2

[0028] Example 2, preparation of iron-titanium oxide defluorination adsorbent

[0029] Prepare 200 mL of mixed solution of ferrous nitrate and titanyl sulfate, in which the concentration of iron ions is 0.02 mol / L, and the concentration of titanium ions is 0.2 mol / L. Under stirring, add sodium bicarbonate solution with a concentration of sodium ions of 4 mol / L , the addition was stopped when the pH endpoint reached 3. After standing still for 0 h, the precipitate generated by the reaction was washed with deionized water until the pH of the effluent was 6, filtered, and dried at 200°C to constant weight, and the dried product was ground to obtain a fluorine-removing adsorbent. When the pH of the aqueous solution is 7, the saturated adsorption capacity of the adsorbent for fluorine in water reaches 52.6 mg / g.

Embodiment 3

[0030] Example 3, preparation of iron-titanium oxide defluorination adsorbent

[0031] Prepare 200mL of ferric chloride and titanium isopropoxide mixed solution, wherein the concentration of iron ion is 0.35mol / L, the concentration of titanium ion is 0.15mol / L, under stirring state, add sodium carbonate solution with a concentration of sodium ion of 6mol / L , the addition was stopped when the pH end point reached 6.5. After standing still for 80 hours, the precipitate generated by the reaction was washed with deionized water until the pH of the effluent was 7, filtered, and dried at 300° C. to constant weight. The dried product was ground to obtain a fluorine-removing adsorbent. When the pH of the aqueous solution is 4, the saturated adsorption capacity of the adsorbent for fluorine in water reaches 55.2 mg / g.

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Abstract

The invention discloses an iron-titanium oxide for defluorination in solutions. The iron-titanium oxide is characterized by comprising iron and titanium, and the molar ratio of iron to titanium is 0.1 to 10; the difference between the saturated adsorption capacity of the iron-titanium oxide to fluorine in the solution with the pH value of 3 to 6 and the saturated adsorption capacity of the iron-titanium oxide to fluorine in the solution with the pH value of 7 ranges from -12.5 mg / g to 15.1 mg / g. The invention further discloses a preparation method and application of the iron-titanium oxide. The iron-titanium oxide has the advantages of being high in adsorption capacity, free of dissolution of harmful ions, high in adsorption defluorination efficiency and the like in the solution with the pH value of 3 to 6.

Description

[0001] The present invention is a divisional case of a patent application with an application date of September 13, 2012, an application number of 201210338666.9, and a title of a preparation method of an iron-titanium oxide defluorination adsorbent. technical field [0002] The invention relates to a preparation method of an iron-titanium oxide defluorination adsorbent. Background technique [0003] Fluoride disease caused by drinking high-fluoride water is one of the most widely distributed endemic diseases in the world. Drinking high-fluoride water for a long time is harmful to bone tissue. In mild cases, dental fluorosis will occur, and in severe cases, it will cause skeletal fluorosis and even lose work. ability, resulting in disability. In areas where endemic drinking-water fluorosis occurs, the incidence of bone growth and development disorders in adolescents ranges from 30% to 46%, which is significantly higher than in non-endemic areas. As of 2008 statistics, there...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/06B01J20/30C02F1/28C02F101/14
CPCB01J20/06C02F1/281C02F2101/14
Inventor 王亭杰陈林何博阳何帅粟超丽张畅
Owner TSINGHUA UNIV
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