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Compound modified bentonite

A technology of composite modification and bentonite, applied in water/sludge/sewage treatment, adsorption water/sewage treatment, other chemical processes, etc., can solve the problem of limited selective adsorption capacity, unsatisfactory adsorption effect, and unsatisfactory adsorption capacity of pollutants. Improvement and other issues, to achieve good adsorption effect, simple modification method

Inactive Publication Date: 2015-03-25
SHENYANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although bentonite has good pollutant adsorption performance, its adsorption capacity for pollutants needs to be improved under some special environmental conditions.
For example, bentonite has no selective adsorption capacity. When alkali metals or alkaline earth metals and other harmless metal ions coexist, its selective adsorption capacity for heavy metals in water is limited; in addition, when the concentration of heavy metals in water is low, its adsorption effect is not ideal.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A composite modified bentonite, comprising sulfonated thiacalix[4]arene, cetyltrimethylammonium bromide and calcium-based bentonite, the content of which is: 4.23 grams of sulfonated thiacalix[4]arene, deca 1.69 grams of hexaalkyltrimethylammonium bromide and 94.08 grams of calcium bentonite. Its preparation method is:

[0017] 1. Weigh 94.08 grams of calcium-based bentonite, dry at 50°C for 4 hours, pass through a 100-200 mesh sieve and set aside.

[0018] 2. Weigh 1.69 g of cetyltrimethylammonium bromide, dissolve it in 200 ml of deionized water, and vibrate ultrasonically for 1 hour to obtain an aqueous solution of cetyltrimethylammonium bromide.

[0019] 3. Add the above dried and sieved bentonite to the aqueous solution of cetyltrimethylammonium bromide, and stir at 25°C for 24 hours.

[0020] 4. Then add 4.23 g of sulfonated thiacalix[4]arene, stir at 25°C for 24 hours, finally filter and separate, rinse with water three times, and dry at 50°C for 4 hours to obt...

Embodiment 2

[0023] A composite modified bentonite comprising sulfonated thiacalix[4]arene, cetyltrimethylammonium bromide and calcium-based bentonite, the content of which is: 10.4 grams of sulfonated thiacalix[4]arene, decaps 10.35 grams of hexaalkyltrimethylammonium bromide and 79.25 grams of calcium bentonite. Its preparation method is:

[0024] 1. Weigh 79.25 grams of calcium-based bentonite, dry at 50°C for 4 hours, pass through a 100-200 mesh sieve and set aside.

[0025] 2. Weigh 10.35 g of cetyltrimethylammonium bromide, dissolve it in 200 ml of deionized water, and oscillate ultrasonically for 1 hour to obtain an aqueous solution of cetyltrimethylammonium bromide.

[0026] 3. Add the above dried and sieved bentonite to the aqueous solution of cetyltrimethylammonium bromide, and stir at 25°C for 24 hours.

[0027] 4. Then add 10.4 g of sulfonated thiacalix[4]arene, stir at 25°C for 24 hours, and finally filter and separate, rinse with water three times, and dry at 50°C for 4 hou...

Embodiment 3

[0029] A composite modified bentonite, comprising sulfonated thiacalix[4]arene, cetyltrimethylammonium bromide and calcium-based bentonite, the content of which is: 7 grams of sulfonated thiacalix[4]arene, ten 5 grams of hexaalkyltrimethylammonium bromide and 88 grams of calcium bentonite. Its preparation method is:

[0030] 1. Weigh 88 grams of calcium-based bentonite, dry at 50°C for 4 hours, pass through a 100-200 mesh sieve and set aside.

[0031] 2. Weigh 5 grams of cetyltrimethylammonium bromide, dissolve it in 200 ml of deionized water, and oscillate ultrasonically for 1 hour to obtain an aqueous solution of cetyltrimethylammonium bromide.

[0032] 3. Add the above dried and sieved bentonite to the aqueous solution of cetyltrimethylammonium bromide, and stir at 25°C for 24 hours.

[0033] 4. Then add 7 grams of sulfonated thiacalix[4]arene, stir at 25°C for 24 hours, and finally filter and separate, rinse with water three times, and dry at 50°C for 4 hours to obtain a...

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Abstract

The invention relates to compound modified bentonite. The compound modified bentonite comprises the following components by weight percent: 4.23wt%-10.4wt% of sulfonated thiacalix[4]arene, 1.69wt%-10.35wt% of hexadecyl trimethyl ammonium bromide and 79.25wt%-94.08wt% of calcium bentonite. A preparation method of the compound modified bentonite comprises the following steps: (1) weighing calcium bentonite, drying for 4 hours, and sieving by virtue of a mesh sieve for later use; (2) weighing hexadecyl trimethyl ammonium bromide, dissolving hexadecyl trimethyl ammonium bromide in deionized water, and carrying out ultrasonic oscillation so as to obtain a hexadecyl trimethyl ammonium bromide water solution; (3) adding the dried and sieved bentonite into hexadecyl trimethyl ammonium bromide water solution, and stirring; and (4) adding sulfonated thiacalix[4]arene, stirring, filtering, separating, washing by virtue of clean water, and drying to obtain the compound modified bentonite. According to the compound modified bentonite, heavy metals in water can be selectively removed in the presence of alkali metals and alkaline-earth metals; the compound modified bentonite has relatively good adsorbing effect to low-concentration heavy metals in water.

Description

technical field [0001] The invention relates to a composite modified bentonite. Background technique [0002] With the rapid development of industry and agriculture, a large number of industrial chemicals are discharged into rivers, lakes, seas and other water bodies, causing serious pollution to the water body environment and increasingly endangering the health of the people. At present, the problem of water pollution control has become one of the important problems that our government urgently needs to solve. [0003] The existing common methods of sewage treatment include physical chemical method, chemical method and biochemical method, but these methods are complicated in process, high in cost and low in efficiency. Studies have shown that the use of adsorption materials (such as activated carbon, bentonite and molecular sieves, etc.) to adsorb pollutants in sewage is an efficient and convenient treatment method to solve water environmental pollution. Bentonite is a la...

Claims

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Application Information

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IPC IPC(8): B01J20/22B01J20/30C02F1/28C02F1/62
CPCB01J20/12B01J20/22C02F1/288
Inventor 胡晓钧何苗苗宋雪英李玉双
Owner SHENYANG UNIV
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