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Composite metal oxide de-fluoridation adsorbent and preparation method therefor

A composite metal and adsorbent technology, applied in chemical instruments and methods, adsorbed water/sewage treatment, other chemical processes, etc., can solve the problems affecting the defluorination efficiency of adsorbents, high cost of rare earth metals, and reduced adsorption capacity, etc. Low production cost, high fluorine removal efficiency, and the effect of promoting adsorption

Inactive Publication Date: 2010-03-17
BEIJING FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these composite metal oxide fluorine removal adsorbents are multi-component composite adsorbents, which have a large load during the preparation process; aluminum-containing system adsorbents are prone to aluminum dissolution during the regeneration stage of the adsorbent, which affects the defluorination efficiency of the adsorbent; There are also many problems in the process, resulting in low adsorbent strength, reduced adsorption capacity, and poor fluoride removal efficiency; the fluoride removal adsorbent containing rare earth elements is not conducive to widespread promotion and use because of the high cost of rare earth metals and high production costs. It is more difficult to apply in remote and backward areas

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] 1. Add ferrous chloride and zirconium nitrate into water, stir and mix with a magnetic stirrer at room temperature to make a mixed solution, wherein the molar concentration of ferrous ions in the mixed solution is 0.3mol / L, and the molar concentration of zirconium ions The molar concentration is 0.3mol / L; the molar ratio of ferrous ions and zirconium ions in the mixed solution is 1:1;

[0039] 2. Add dropwise a sodium hydroxide solution with a molar concentration of 1 mol / L to the mixed solution while stirring, and carry out a co-precipitation reaction until the pH of the reaction mixed solution is 7.5;

[0040] 3. After the reacted solution was left to stand for 12 hours, filter, and wash the precipitate with deionized water until the pH value of the washed effluent was 7.5 to obtain the precipitate;

[0041] 4. Put the precipitate in a centrifuge for centrifugation, the centrifugation speed is 3000rpm, the centrifugation time is 15 minutes, and then take out the upper...

Embodiment 2

[0047] 1. Add ferrous sulfate and zirconium sulfate into water, stir and mix with a magnetic stirrer at room temperature to make a mixed solution, wherein the molar concentration of ferrous ions in the mixed solution is 0.1mol / L, and the molar concentration of zirconium ions The concentration is 0.2mol / L; the molar ratio of ferrous ions to zirconium ions in the mixed solution is 1:2;

[0048] 2. Under stirring, add dropwise a potassium hydroxide solution with a molar concentration of 1 mol / L to the mixed solution to carry out a co-precipitation reaction until the pH of the mixed solution is 7.0;

[0049] 3. After the reacted solution was left to stand for 15 hours, filter, and wash the precipitate with deionized water until the pH value of the washed effluent was 7, and the precipitate was obtained;

[0050] 4. Put the precipitate in a centrifuge for centrifugation, the centrifugation speed is 3000rpm, the centrifugation time is 15 minutes, and then take out the upper layer of...

Embodiment 3

[0056] 1. Add ferrous sulfate and zirconium chloride into water, stir and mix with a magnetic stirrer at room temperature to make a mixed solution, wherein the molar concentration of ferrous ions in the mixed solution is 0.1mol / L, and the molar concentration of zirconium ions The molar concentration is 0.3mol / L; the molar ratio of ferrous ions to zirconium ions in the mixed solution is 1:3;

[0057] 2. Under stirring, add dropwise a sodium hydroxide solution with a molar concentration of 4 mol / L to the mixed solution to carry out a co-precipitation reaction until the pH of the reaction mixed solution is 7.0;

[0058] 3. After the reacted solution was left to stand for 10 hours, it was filtered and washed with deionized water until the pH of the washed effluent was 7.0 to obtain a precipitate;

[0059] 4. Centrifuge the sediment in a centrifuge, the centrifugal speed is 3500rpm, the centrifugation time is 10 minutes, and then take out the supernatant;

[0060] 5. Place the cen...

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Abstract

The invention relates to a composite metal oxide de-fluoridation adsorbent and a preparation method therefor. The composite metal oxide de-fluoridation adsorbent contains Zr and Fe. The preparation method for the composite metal oxide de-fluoridation adsorbent comprises the following steps: carrying out coprecipitation reaction on Fe-containing compound and Zr-containing compound, and then formingthe composite metal oxide de-fluoridation adsorbent by the drying. The composite metal oxide de-fluoridation adsorbent is suitable for being used under the neutral condition, the stability is good, and the adsorption capacity for fluorine is high. Under the neutral condition, the adsorption capacity for fluorine in water can reach 54.5-78.38mg / g under the near-neutral condition, and the de-fluoridation efficiency is higher than the normally-used de-fluoridation adsorption material.

Description

technical field [0001] The invention relates to a solid adsorbent composition and a preparation method thereof, in particular to a composite metal oxide adsorbent and a preparation method thereof. Background technique [0002] Fluorine is one of the essential trace elements for human life. Appropriate amount of fluorine can strengthen bones and teeth and reduce the incidence of dental caries. The appropriate concentration of fluorine in drinking water is 0.5-1 mg / L. When the fluorine content in drinking water is insufficient, it is easy to suffer from dental caries; but if drinking water with a fluorine concentration higher than 1mg / L for a long time, it will cause dental fluorosis; long-term drinking water with a fluorine concentration of 3-6mg / L Can cause skeletal fluorosis. When fluorine accumulates in the human body for a long time, it can penetrate deep into the bones to generate CaF 2 , resulting in brittle bones, tooth stains, calcification of ligaments, joint sti...

Claims

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Application Information

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IPC IPC(8): B01J20/06B01J20/30C02F1/28C02F1/58
Inventor 豆小敏梁文艳陈苗王毅力杨硕
Owner BEIJING FORESTRY UNIVERSITY