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Preparation method for diatomite adsorbent chemically modified by nano gamma-Al2O3 adopting ordered structure

A technology of ordered structure and chemical modification, applied in the field of materials, can solve the problems of reduced adsorption effect of heavy metal ions, low specific surface area, limited adsorption capacity, etc.

Inactive Publication Date: 2014-08-06
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when diatomite adsorbs heavy metal ions, its specific surface area is low, and its adsorption capacity is limited. In addition, in heavy metal wastewater with a low pH value, H+ in water samples will inhibit the dissociation of H+ on silicon hydroxyl groups, resulting in diatomite The effect of adsorbing heavy metal ions is reduced

Method used

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  • Preparation method for diatomite adsorbent chemically modified by nano gamma-Al2O3 adopting ordered structure
  • Preparation method for diatomite adsorbent chemically modified by nano gamma-Al2O3 adopting ordered structure
  • Preparation method for diatomite adsorbent chemically modified by nano gamma-Al2O3 adopting ordered structure

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] In the first step, 1.8 g of diatomite was weighed and dissolved in a beaker filled with 30 ml of deionized water, and the beaker was placed in a constant temperature water bath and stirred for 30 minutes to obtain a suspension of diatomite.

[0020] In the second step, accurately weigh 4.828g AlCl 3 ﹒ 6H 2 O was added to the suspension of diatomite, stirred with constant temperature magnetic force for 3h and fully immersed on the diatomite to prepare AlCl containing diatomite 3 suspension.

[0021] The third step is to prepare 2mol / L ammonia solution and add the above AlCl 3 In the suspension, adjust the pH to 4 and continue stirring for 30 min.

[0022] In the fourth step, weigh 0.107 g of sodium dodecylbenzene sulfonate and add it to the above solution, stir for 30 min, then add 2.67 g of urea, and stir for 1 h.

[0023] In the fifth step, the solution is transferred to a reaction kettle for 180°C hydrothermal reaction for 3 hours for aging, after cooling to room...

Embodiment 2

[0025] In the first step, 2.2 g of diatomite was weighed and dissolved in a beaker filled with 50 ml of deionized water, and the beaker was placed in a constant temperature water bath and stirred for 30 minutes to obtain a suspension of diatomite.

[0026] In the second step, accurately weigh 5.634g AlCl 3 ﹒ 6H 2 O was added to the suspension of diatomite, stirred with constant temperature magnetic force for 3h and fully immersed on the diatomite to prepare AlCl containing diatomite 3 suspension.

[0027] The third step is to prepare 3mol / L ammonia solution and add the above AlCl 3 In the suspension, adjust the pH to 4 and continue stirring for 30 min.

[0028] In the fourth step, weigh 0.191 g of sodium dodecylbenzenesulfonate and add it to the above solution, stir for 30 min, then add 4.06 g of urea, and stir for 1 h.

[0029] The fifth step is to transfer the solution to the reaction kettle for 3 hours of hydrothermal reaction at 180°C for aging, after cooling to room ...

Embodiment 3

[0031] In the first step, 1.0 g of diatomite was weighed and dissolved in a beaker filled with 30 ml of deionized water, and the beaker was placed in a constant temperature water bath and stirred for 30 minutes to obtain a suspension of diatomite.

[0032] In the second step, accurately weigh 2.272g AlCl 3 ﹒ 6H 2 O was added to the suspension of diatomite, stirred with constant temperature magnetic force for 3h and fully immersed on the diatomite to prepare AlCl containing diatomite 3 suspension.

[0033] The third step is to prepare 1mol / L ammonia solution and add the above AlCl 3 In the suspension, adjust the pH to 4 and continue stirring for 30 min.

[0034] Step 4: Weigh 0.036 g of sodium dodecylbenzenesulfonate and add it to the above solution, stir for 30 min, add 2.16 g of urea and 0.3704 g of ammonium fluoride, and stir for 1 h.

[0035] In the fifth step, the solution is transferred to a reaction kettle for 180°C hydrothermal reaction for 3 hours for aging, after...

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Abstract

The invention relates to the field of materials and particularly to a preparation method for a diatomite adsorbent chemically modified by nano gamma-Al2O3 adopting an ordered structure. The preparation method comprises the following steps: adding AlCl3.6H2O into the suspension liquid of diatomite; preparing AlCl3 suspension liquid containing diatomite; preparing an ammonia water solution; dropwise adding the ammonia water solution into the AlCl3 suspension liquid containing the diatomite; adjusting the pH to be 4 and stirring continuously; adding the surfactant cetyl trimethyl ammonium bromide or sodium dodecyl benzene sulfonate into the solution; stirring for 30 min, and then adding a certain amount of urea and ammonium fluoride; transferring the solution to a reaction kettle for performing hydrothermal reaction at the temperature of 180 DEG C for 3 h, aging, cooling to room temperature, performing suction filtration, washing, and drying; performing heat treatment and cooling finally, obtaining a final sample. According to the preparation method, by coating a diatomite basic core with the nano gamma-Al2O3 adopting the ordered structure and depositing the nano gamma-Al2O3 adopting the ordered structure on the diatomite basic core through a hydrothermal method, the compound microporous adsorbent which is good in heavy metal ion adsorption performance is prepared, and can be used for adsorbing low-concentration solutions containing lead, copper and zinc metal ions, and the removal rate can reach 93% above.

Description

technical field [0001] The invention relates to the field of materials, and is an ordered structure nanometer γ-Al 2 o 3 The preparation method of chemically modified diatomite adsorbent. Background technique [0002] In recent years, the pollution of chromium, cadmium, lead, zinc, manganese, copper and other heavy metals in natural waters has become more and more serious, seriously endangering human's physical and mental health, and its pollution control has always attracted attention at home and abroad. At present, there are more than a dozen methods for the treatment of heavy metal polluted wastewater, but only the oxidation method, flocculation sedimentation method, membrane separation method, and adsorption method can be applied on a large scale. Traditional adsorbents are limited in practical industrial applications due to their own difficulties. For example, the cost of activated carbon and lignin is too high, and natural mineral powders such as kaolin and montmoril...

Claims

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Application Information

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IPC IPC(8): B01J20/14B01J20/30
Inventor 杜玉成郑广伟孙广兵王金淑吴俊书王利平
Owner BEIJING UNIV OF TECH
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