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.
CN103962094AInactive Publication Date: 2014-08-06BEIJING UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
BEIJING UNIV OF TECH
Publication Date
2014-08-06
Estimated Expiration
Not applicable · inactive patent

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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.
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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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