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Attapulgite composite adsorption material and preparation method
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A composite material and attapulgite technology, applied in the field of water treatment, can solve the problems of low removal rate, long reaction time, insufficient utilization of attapulgite adsorption performance, etc.
Active Publication Date: 2018-06-29
GUANGDONG UNIV OF TECH
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[0004] In the existing attapulgite modification technology, the adsorption performance of attapulgite is not fully utilized. When treating organic wastewater, there are problems such as low removal rate, long reaction time, and small applicable pH range.
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[0040] The present invention also provides a kind of preparation method of attapulgite composite material, comprising the following steps:
[0041] A) mixing attapulgite with hydrochloric acid solution, centrifuging and drying the suspension to obtain acidified attapulgite;
[0042] B) adding the acidified attapulgite into the chitosan solution, modifying the unevenness, and then centrifuging and drying to obtain the chitosan / attapulgite material;
[0044] In the invention, the natural attapulgite is added into the hydrochloric acid solution, configured into a suspension, vibrated at a constant temperature, centrifuged, washed, dried, ground and sieved to obtain the acidified attapulgite.
[0045] The concentration of the h...
Embodiment 1～3
[0054] Add natural attapulgite to 3mol / L hydrochloric acid to prepare a suspension containing attapulgite 250g / L, shake at a constant temperature at 25°C for 3h, centrifuge and wash it, put it in a drying oven at 60°C for 12h, and then grind it for 200 Mesh sieve to obtain acidified attapulgite.
[0055] Weigh 0.08g, 0.16g and 0.32g of chitosan with a degree of deacetylation of 90% and dissolve it in 100mL of glacial acetic acid with a volume fraction of 2%. The sugar is completely dissolved, slowly add 16g of acidified attapulgite, stir for 3 hours, put it into a 60°C drying oven for 12 hours after centrifugal washing, and pass through a 200-mesh sieve after grinding to obtain chitosan with a loading ratio of 0.5% CTS / ATP , 1.0% CTS / ATP and 2.0% CTS / ATP.
[0056] In a water bath at 60°C, measure 10mL of tetrabutyl peptidate and slowly drop it into 30mL of absolute ethanol, add 2mL of glacial acetic acid to control the hydrolysis rate, stir with a magnetic stirrer for 15 minu...
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Abstract
The invention provides an attapulgite composite adsorption material, which is prepared from acidized attapulgite, chitosan and titanium dioxide, wherein the chitosan and the titanium dioxide are loaded on the acidized attapulgite, and a mass ratio of the chitosan to the acidized attapulgite is 1 : (50 to 200). According to the attapulgite composite adsorption material disclosed by the invention, the TiO2 and CTS are loaded to the attapulgite carrier with a high specific surface area; the attapulgite is utilized as the carrier, so that the agglomeration phenomenon of the TiO2 is effectively avoided; furthermore, chitosan loading can provide more attachement sites for the TiO2, and particles can be more dispersive and evener. A modified appatulgite structure is converted into a porous shapefrom a lamellar shape, so that the specific surface area is enlarged, the amounts of amino and hydroxyl on the surface are increased, and adsorption performance of the appatulgite is enhanced. Experiment results show that the attapulgite composite adsorption material disclosed by the invention has an effect on common pollutants of humic acid, congo red and Cr(VI) in water treatment, and a removalrate is 90% stably. The invention further provides a preparation method of the attapulgite composite material.
Description
technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to an attapulgite composite adsorption material and a preparation method thereof. Background technique [0002] Attapulgite (ATP for short) is a crystalline hydrated magnesiumaluminum silicate mineral with strong hydrophilicity. When attapulgite is used in wastewater treatment, its adsorption capacity is limited mainly in the following two points: First, when water and organic pollutants compete for adsorption on the surface of attapulgite, water molecules are preferentially adsorbed and occupy the pores of attapulgite. The active adsorption sites on the surface reduce the removal rate of organic pollutants; second, the high surface energy of attapulgite makes it easy to aggregate into clusters and the specific surface area decreases. Therefore, naturally produced attapulgites usually cannot meet the requirements of water treatment to remove organic matter. ...
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