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Method for removing fluorine ion from water by using zirconium oxide carried molecular screen

A technology of zirconium oxide and molecular sieve, which is applied to chemical instruments and methods, water pollutants, and other chemical processes, can solve the problems of low fluoride ion adsorption and low selectivity, and achieve improved adsorption effect, easy-to-obtain materials, The effect of the treatment effect is remarkable

Inactive Publication Date: 2008-07-09
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the problems of low fluoride ion adsorption and low selectivity of existing adsorbents, and to provide a zirconium oxide supported by molecular sieves in removing fluoride ions in water by utilizing the properties of metal oxides and molecular sieves. application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Example 1 Molecular sieve loaded with zirconium oxide

[0034] Soak the Y molecular sieve with a Si / Al molar ratio of 2.45 at 80°C with 1mol / L ammonium nitrate solution for 4 hours, accompanied by magnetic stirring during the actual process (the amount of molecular sieve and ammonium salt should be controlled at 1g:80ml); filter, heat distilled water Washing; repeat the above process twice; bake the sample at 80°C for 6-8h to constant weight; roast at 600°C for 5h to obtain acid-exchanged modified molecular sieves.

[0035] The modified molecular sieve solid and zirconium nitrate are mixed and ground for 20-30 minutes, and the mass ratio of molecular sieve and zirconium nitrate is 1:1; the ground product is roasted at 200° C. for 2 hours; the molecular sieve loaded with zirconium oxide is obtained.

Embodiment 2

[0036] Example 2 Molecular sieve loaded with zirconium oxide

[0037] Soak the Y molecular sieve with a Si / Al molar ratio of 2.45 at 80°C with 1mol / L ammonium nitrate solution for 3 hours, accompanied by magnetic stirring during the actual process (the amount of molecular sieve and ammonium salt should be controlled at 1g:80ml); filter, heat distilled water Washing; repeat the above process once; bake the sample at 80°C for 6-8h to constant weight; roast at 500°C for 4h to obtain the acid-exchanged modified molecular sieve.

[0038] The modified molecular sieve solid and zirconium nitrate are mixed and ground, and the mass ratio of molecular sieve and zirconium nitrate is 1:2; the ground product is roasted at 200° C. for 2 hours; thus the molecular sieve loaded with zirconium oxide is obtained.

Embodiment 3

[0040] The molecular sieve loaded with zirconium oxide in Example 1 was used as an adsorbent to adsorb fluoride ions in water. Adsorption was carried out in a closed container (volume 50 ml) at room temperature. The initial concentration of fluoride ion is 100mg / L, pH=6, the mass ratio of adsorbent to slightly polluted water is 1:500. The maximum adsorption capacity is 23.8mg / g under 298K for 12h.

[0041] In this example and the following comparative examples or examples, the adsorption amount refers to the mass of fluorine adsorbed per gram of adsorbent.

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Abstract

The invention discloses application of molecular sieve loading zirconium oxide for removing fluoride ions from water. The invention also discloses a method by employing the molecular sieve loading zirconium oxide to remove the fluoride ions from water, namely absorbing and removing the fluoride ions by modified molecular sieve loading zirconium oxide from polluted water at a temperature of 10-40DEG C under the acidic or alkaline condition. The invention shows remarkable adsorption capacity superior to than of conventional adsorption materials by the time when removing fluorine contaminants from the water by the adsorption method. In addition, the invention has the advantages of simple operation, easy obtaining of materials, low cost and obvious treatment effect, thereby the invention has perfect economic and social benefits for removing the fluoride ions from source water of slightly polluted water.

Description

technical field [0001] The invention belongs to the technical field of water body molecular sieves and oxides, and in particular relates to the application of molecular sieve-supported zirconium oxides in removing fluorine ions in water. Background technique [0002] With the development of modern industry, the production of fluorine and its compounds is increasing. The waste water produced by the mining and processing of fluorine-containing ore, metal smelting, aluminum electrolysis, coke, glass, electronics, electroplating, fertilizer, pesticide, chemical industry and other industries often contains high concentrations of fluoride, which causes environmental pollution after being discharged into water bodies, causing people of high attention. Fluorine is one of the essential trace elements for the human body, but when the daily intake of fluorine exceeds the normal needs for a long time, it will lead to endemic fluorosis. High fluoride content in drinking water is the mo...

Claims

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Application Information

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IPC IPC(8): C02F1/58C02F1/28B01J20/18C02F101/14C02F101/36
Inventor 许昭怡顾浩郑寿荣范杰刘凤玲李丽媛刘景亮穆容心邢涛王家宏赵瑞东
Owner NANJING UNIV
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