Preparation and application of attapulgite/Fe3O4/carbon composite material
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A carbon composite material, attapulgite technology, applied in water/sludge/sewage treatment, alkali metal compounds, water/sewage treatment and other directions, can solve the problems of few preparation steps, inability to generate, difficult to control reaction, etc., to achieve the purpose Wide, easy-to-control, strong adsorption effect
Inactive Publication Date: 2017-10-20
ANHUI UNIVERSITY OF TECHNOLOGY
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The advantage of this method is that preparation steps are few, but formula (2) reaction is difficult to control, and this is because ferrous hydroxide is easily oxidized into ferric hydroxide precipitation by air, can not generate Fe in hydrothermal reactor. 3 o 4 particles
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Embodiment 1
[0040] 1) Add 1.0 g of ferric chloride hexahydrate and 0.5 g of attapulgite to 70 mL of ethylene glycol, add 0.3 g of chitosan powder after vigorous stirring, and ultrasonically disperse for 30 minutes to obtain a light yellow viscous liquid;
[0041] 2) Add 3.0 g of anhydrous sodium acetate powder to the viscous liquid obtained in step 1), and stir continuously for 30 minutes;
[0042] 3) Transfer the suspension solution obtained in step 2) to a 100mL polytetrafluoroethylene reactor (filling degree ≤80%), and react under hydrothermal conditions at 180°C for 24h;
[0043] 4) Magnetic separation after natural cooling, washing with absolute ethanol and distilled water for 3 to 4 times, the resulting black product is dried in an electric blast drying oven at 60°C, ground and sieved to obtain attapulgite / Fe 3 O 4 / C Nanocomposite materials;
[0044] 5) Weigh out 0.05g of the magnetic nanocomposite material prepared in Example 1, and add it to 40mLK 2 Cr 2 O 7 In the solution (pH=2,300mg / L)...
Embodiment 2
[0046] 1) Same as Example 1, except that the chitosan added during the preparation of the magnetic nanocomposite is 1.5g;
[0047] 2) Weigh 0.05g of the adsorbent prepared in step 1) and add it to 40mLK 2 Cr 2 O 7 In the solution (pH=2,300mg / L), oscillate to adsorption equilibrium at 298K. After magnetic separation, the Cr(VI) concentration in the supernatant is measured, and the Cr(VI) removal rate is calculated to be 82.9%.
Embodiment 3
[0049] 1) Same as Example 1, except that the amount of chitosan added during the preparation of the magnetic nanocomposite is 3.0g;
[0050] 2) Weigh out 0.05g of the adsorbent prepared in step 1) and add to 40mLK 2 Cr 2 O 7 In the solution (pH=2,300mg / L), oscillate to adsorption equilibrium at 298K. After magnetic separation, the concentration of Cr(VI) in the supernatant is measured, and the Cr(VI) removal rate is calculated to be 93.4%.
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Abstract
The invention discloses preparation and application of an attapulgite/Fe3O4/carbon composite material and belongs to the technical field of heavy metal wastewater treatment. A one-step hydrothermal method is adopted, attapulgite, a ferric salt and chitosan are used as raw materials, in a hydrothermal reactor, a part of ferric iron is reduced into ferrous iron by a reduction solvent, i.e. ethylene glycol, magnetic Fe3O4 generated under an alkali condition nucleates and grows on the surface of the attapulgite, the chitosan is carbonized into amorphous carbon to be loaded on the surface of the attapulgite, and finally the magnetic nanometer composite material is formed. The surface of the magnetic nanometer composite material is rich in active groups, such as hydroxyl, carboxyl and amino, the magnetic nanometer composite material can be used for absorbing Cr (VI) in a water body, and the highest adsorbing capacity of the magnetic nanometer composite material to hexavalent chromium in water under the conditions that pH is equal to 2 and the temperature is 298K is 250mg/g; and the composite material has certain magnetism and can be quickly separated under the condition of an external magnetic field, and the problem that the attapulgite/carbon nanometer composite material is difficultly separated is solved.
Description
Technical field [0001] The invention belongs to the technical field of heavy metal wastewater treatment, and specifically relates to an attapulgite / Fe 3 O 4 / Carbon nanocomposite material, the present invention also relates to the attapulgite / Fe 3 O 4 / Carbon nanocomposite material adsorption and removal of Cr (Ⅵ) from water. Background technique [0002] The heavy metal chromium is one of the priority pollutants in my country, mainly from the three wastes discharged by electroplating, metallurgy, tanning, printing and dyeing and chemical industries. Chromium mainly exists in the water body as Cr(Ⅲ) and two forms. Cr(Ⅵ) is an acute carcinogen with much higher mobility and toxicity than Cr(Ⅲ), and it is easier to be absorbed by the body and accumulate in the body. At present, the main treatment methods of chromium-containing wastewater include chemical precipitation, solvent extraction, reverse osmosis, reduction, and adsorption. Because the adsorption method has the advantages ...
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