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A kind of preparation method of modified montmorillonite adsorbent and application of removing micro and trace amount of iodine

A technology of montmorillonite and adsorbent, which is applied in the field of preparation of modified montmorillonite adsorbent, can solve problems such as no effect, achieve good removal and enrichment effect, fast adsorption speed, and high adsorption capacity

Inactive Publication Date: 2011-12-21
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has a certain adsorption effect on high-concentration iodide ions, which can be reduced from 2000ppm to 500ppm, but has no obvious effect on low-concentration iodide ions.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0022] A kind of preparation method of the modified montmorillonite that removes micro, trace amount of iodine, is made by following method:

[0023] (1) Calcining Na-montmorillonite at 30° C. for 1 h, then adding the calcined Na-montmorillonite to an aqueous solution of nitric acid at a pH of 1 at a mass ratio of 1:40, soaking for 8 h to form a suspension.

[0024] (2) Add cetyltrimethylammonium bromide in a mass ratio of 1:10 to deionized water, stir at 20° C. for 10 minutes, and filter to obtain a transparent filtrate.

[0025] (3) Add the filtrate in step (2) to the suspension in step (1) under the conditions of keeping the stirring speed at 60r / min and the temperature at 20°C, and add it dropwise for 1h, then continue to stir 1h, a mixture was obtained.

[0026] (4) Put the mixed solution in step (3) in a water bath at 60° C. at a rotating speed of 70 r / min, stir for 4 hours, then filter the mixed solution and wash once to obtain a filter cake. The filter cake was added...

example 2

[0034] A kind of preparation method of the modified montmorillonite that removes micro, trace amount of iodine, is made by following method:

[0035] (1) Calcium-based montmorillonite was calcined at 120° C. for 3 hours, and then the calcined sodium-based montmorillonite was added to an aqueous nitric acid solution with a pH of 4 at a mass ratio of 1:50, and soaked for 16 hours to form a suspension.

[0036] (2) Add hexadecyltrimethylammonium bromide in a mass ratio of 1:30 to deionized water, stir at 35° C. for 30 minutes, and filter to obtain a transparent filtrate.

[0037] (3) Add the filtrate in step (2) to the suspension in step (1) under the conditions of keeping the stirring speed at 90r / min and the temperature at 40°C, the time of adding drops is 3h, and then continue to stir After 1.5h, a mixed solution was obtained.

[0038](4) Put the mixed solution in step (3) in a water bath at 80° C. at a rotation speed of 100 r / min, stir for 7 hours, then filter the mixed solu...

example 3

[0047] A kind of preparation method of the modified montmorillonite that removes micro, trace amount of iodine, is made by following method:

[0048] (1) Calcining sodium-calcium-based montmorillonite at 200°C for 3 hours, then adding the calcined sodium-calcium-based montmorillonite to an aqueous nitric acid solution with a pH of 6 at a mass ratio of 1:60, soaking for 24 hours to become suspension.

[0049] (2) Add hexadecyltrimethylammonium bromide at a mass ratio of 1:60 to deionized water, stir at 50° C. for 60 min, and filter to obtain a transparent filtrate.

[0050] (3) With the stirring speed at 120r / min and the temperature at 60°C, add the filtrate in step (2) to the suspension in step (1) for 5 hours, then continue to stir 2h, a mixed solution was obtained.

[0051] (4) Put the mixed solution in step (3) in a water bath at 90° C., keep the rotating speed at 120 r / min, stir for 10 h, then filter the mixed solution and wash it 10 times to obtain a filter cake. The f...

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Abstract

The invention relates to a preparation method for a modified montmorillonite adsorbent and application thereof to removing micro or trace iodine. The preparation method is characterized in that: a soluble silver salt is used as a main modification source, copper and zinc cations are used as assistants, and hexadecyl trimethyl ammonium bromide is combined, so that the requirements of processing hydrophilic and hydrophobic iodine are met. The iodine removing adsorbent is a substance with high mechanical strength and uniform grains and has a high removal rate which reaches 99 percent for the micro or trace iodine in a water system and has the characteristics of high adsorption speed and high adsorption capacity. The method is suitable for removing the micro or trace iodine existing in the water system, trace iodide in an acetic acid, propionic acid and / or acetic anhydride product and iodide impurity C1-C6 alkyl iodine such as methyl iodine existing in organic liquid.

Description

technical field [0001] The invention relates to a preparation method of an adsorbent capable of removing traces and trace iodine ions in a water system and treating iodine in a non-aqueous system, belonging to the field of new materials. In particular, a preparation method of a modified montmorillonite adsorbent and its application for removing micro and trace amounts of iodine. Background technique [0002] There are currently 12 provinces and cities in my country with high iodine areas, including Beijing, Tianjin, Hebei, Henan, Shandong, Shanxi, Inner Mongolia, Xinjiang, Jiangsu, Anhui, Fujian, and Shaanxi. The existence of high iodine water has very serious harm to people, for example, iodine causes goiter. At the same time, the effect is exacerbated by the presence of radioactive iodine, an isotope of iodine. Radioactive iodine is one of the main components in the early mixed fission products. In nuclear explosions and reactor accidents, it is the main nuclide that pol...

Claims

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Application Information

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IPC IPC(8): B01J20/22B01J20/30C02F1/28C02F1/58
Inventor 那平翟瑞国李元郭敬维蔡晓娇王学思
Owner TIANJIN UNIV
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