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Preparation and application methods of polyaluminium chloride modified graphene oxide adsorbent

A polyaluminum chloride and oxide stone technology, applied in the field of fatty acids, can solve the problems of difficult solid-liquid separation of purified water, highly dispersed adsorbents, and large electrostatic repulsion, and achieve sustainable economic development, efficient removal, and improved adsorption. The effect of capacity

Active Publication Date: 2017-10-24
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Based on the deficiencies of the above prior art, the present invention aims at the graphene oxide adsorbent in the process of removing the anionic surfactant fatty acid, which has a large electrostatic repulsion between the graphene oxide adsorbent and sodium oleate, small adsorption capacity, and decontamination The adsorbent after the fatty acid is highly dispersed, and it is difficult to separate the solid-liquid from the purified water

Method used

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  • Preparation and application methods of polyaluminium chloride modified graphene oxide adsorbent
  • Preparation and application methods of polyaluminium chloride modified graphene oxide adsorbent
  • Preparation and application methods of polyaluminium chloride modified graphene oxide adsorbent

Examples

Experimental program
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Effect test

Embodiment example 1

[0046] This case illustrates the preparation method of polyaluminum chloride modified graphene oxide suspension.

[0047] 1) Weighing 1.0 g of aphanitic graphite to prepare graphite oxide, first acid-washing the prepared graphite oxide, then washing with water, and finally centrifuging with a centrifuge.

[0048] 2) drying the centrifuged graphite oxide with a vacuum freeze drying oven for 48 hours, and grinding the dried graphite oxide into powder.

[0049] 3) Use a FLUKO high-shear dispersing mixer to uniformly disperse 0.2 g of graphene oxide powder in 300 mL of water.

[0050] 4) Exfoliate the graphite oxide solution for 9 minutes with a Cole Parmer (750W, 20KHz) ultrasonic cell pulverizer, and control the amplitude at 30%.

[0051] 5) The stripped suspension was centrifuged at 4000r / min for 20 minutes, and the supernatant was the graphene oxide suspension with a concentration of 0.385g / L.

[0052] 6) Graphene oxide thickness detection, the atomic force micrograph of gra...

Embodiment example 2

[0058] This case illustrates the adsorption rate of polyaluminum chloride modified graphene oxide adsorbent on sodium oleate.

[0059] 1) Take the oleic acid wastewater with a concentration of 250mg / L as the object of treatment.

[0060] 2) Mix the polyaluminum chloride-modified graphene oxide suspension (10 mL) prepared in Case 1 with 250 mg / L oleic acid wastewater (40 mL) in a conical flask.

[0061] 3) Put the Erlenmeyer flask on the shaker, at the adsorption reaction temperature of 25°C and the shaking speed of 150rpm, the adsorption and removal times are 0.25h, 1.5h, 3h, 5h, 9h, 11h, 21h and 24h respectively.

[0062] 4) Take out the Erlenmeyer flask after the adsorption reaction is completed from the oscillator, and finally take out the solution in the Erlenmeyer flask and centrifuge it for 15 minutes at a speed of 12000r / min in a centrifuge to realize the solid-liquid separation of the graphene oxide after adsorption, and take out the centrifuge The final supernatant w...

Embodiment example 3

[0066] This case illustrates the effect of solution pH on the adsorption capacity of polyaluminum chloride modified graphene oxide adsorbent.

[0067] 1) Take 40 mL of sodium oleate waste water with a concentration of 250 mg / L and inject it into 7 Erlenmeyer flasks as the object of treatment.

[0068] 2) Mix the graphene oxide suspension (10 mL) prepared in Case 1 with 250 mg / L oleic acid wastewater (40 mL) in a conical flask. And adjust the pH value of the suspension in the Erlenmeyer flask to 4, 5, 6, 7, 8, 9, 10 respectively.

[0069] 3) Put the Erlenmeyer flask on the shaker, at the adsorption reaction temperature of 25° C. and the shaking speed of 150 rpm, the adsorption and removal time is 24 hours.

[0070] 4) Take out the Erlenmeyer flask after the adsorption reaction is completed from the oscillator, and finally take out the solution in the Erlenmeyer flask and centrifuge it for 15 minutes at a speed of 12000r / min in a centrifuge to realize the solid-liquid separatio...

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Abstract

The invention discloses a method for adsorbing and removing fatty acid in wastewater by utilizing polyaluminium chloride modified graphene oxide. The method comprises the following steps: preparing graphene oxide suspension liquid by using natural graphite as a raw material and using a Hummer method; adding a certain amount of polyaluminium chloride solution into the graphene oxide suspension liquid, and evenly mixing to obtain polyaluminium chloride modified graphene oxide suspension liquid; evenly mixing the polyaluminium chloride modified graphene oxide suspension liquid with the wastewater in a certain volume ratio, and oscillating to obtain the graphene oxide suspension liquid adsorbing the fatty acid; simultaneously converting graphene oxide into floccules; filtering to obtain purified water in which the fatty acid is removed and the graphene oxide after adsorption reaction. According to the method disclosed by the invention, the graphene oxide is modified by utilizing the polyaluminium chloride, so that negative charge of the surface of the graphene oxide is changed into positive charge; through electrostatic adsorption and chemical adsorption, the adsorption volume of the graphene oxide adsorbent on the fatty acid is improved; through a flocculation effect of the polyaluminium chloride, the solid-liquid separation efficiency of the graphene oxide adsorbent is greatly improved.

Description

technical field [0001] The invention relates to a method for adsorbing and removing fatty acids in waste water by using polyaluminum chloride modified graphene oxide. Background technique [0002] The use of surfactants is increasing year by year, and the scope of use is constantly expanding, and the harm to human health and the environment is becoming more and more serious. The harm of surfactants to human health is mainly reflected in its chronic toxicity, which can cause changes in the number of hemoglobin, red blood cells and white blood cells, and cause damage to human skin. The concentration of surfactant reaches 1mg·L -1 Surfactants can form a large amount of foam in the water body, which not only affects the landscape of the natural water body, but also forms an isolation layer on the water surface, thereby reducing the dissolution and transfer rate of oxygen, weakening the gas exchange between the water and the atmosphere, and causing water quality problems. deter...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/30C02F1/28C02F101/34
CPCB01J20/0288B01J20/20C02F1/281C02F2101/34
Inventor 李洪强陈鹏丁一刚翁孝卿彭伟军
Owner WUHAN INSTITUTE OF TECHNOLOGY
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