Preparation of linear amino modified graphene oxide adsorption material

An adsorption material, graphene technology, applied in adsorption water/sewage treatment, other chemical processes, chemical instruments and methods, etc., can solve the problems of low removal rate, high cost, secondary pollution, etc., to improve regeneration capacity, increase The effect of adsorption capacity and simple preparation process

Inactive Publication Date: 2014-06-18
JISHOU UNIVERSITY
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Problems solved by technology

Traditional heavy metal wastewater treatment methods mainly include chemical precipitation, ion exchange, reverse osmosis, membrane technology, distillation, electrochemical treatm

Method used

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  • Preparation of linear amino modified graphene oxide adsorption material
  • Preparation of linear amino modified graphene oxide adsorption material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] First, dissolve graphene oxide in ethanol at room temperature, sonicate it for 1 hour to make it uniform, add it to a 500ml three-necked flask, and add a certain amount of ethanol-soluble ethylenediamine. The mass ratio of the reactants is graphene oxide : Ethylenediamine: Ethanol=1:1~10:10~120. During the process of adding ethylenediamine, it can be found that the two react violently, indicating that it is reacting and the ethylenediamine is quickly dissolved. The whole reaction was continuously stirred mechanically in a water bath at 80°C. After the reaction was carried out for 24 hours, the material obtained from the reaction was filtered under reduced pressure and washed with ethanol three times. After being dried at 80°C for 12 hours, a carboxyl and amino group was obtained. Graphene oxide-ethylenediamine adsorption material. In order to ensure the completion of the reaction and improve the ability of the adsorbent to adsorb heavy metal ions, the ethylenediamine was...

experiment example 2

[0021] Weigh 0.1g of the adsorbent prepared in Experimental Example 1 and place them in a 250ml dry round-bottomed flask, and add 100ml of the initial concentration of pH=4.5, concentration C 0 =0.5,1,1.5,2.0,2.5,3.0,3.5,4,4.5 and 5mmol / L Pb(NO 3 ) 2 The solution was oscillated ultrasonically for 1 hour to make the adsorbent dispersed well in the solution, then placed in a constant temperature water bath at 25°C, sealed a round bottom flask, stirred at constant temperature, after 3 hours, take the adsorbed solution and filter it with a funnel, and use atomic absorption spectroscopy The photometer measures the concentration of lead ions remaining in the filtrate, and then calculates the adsorption capacity of the adsorbent according to (1).

[0022] The experimental results show that the adsorbent prepared in Experimental Example 1 has an adsorption capacity of 379.62 mg / g for lead ions under the conditions of a temperature of 25°C and a pH of 4.5.

experiment example 3

[0024] Weigh 0.1g of the adsorbent prepared in Experimental Example 1 and place them in a 250ml dry round-bottomed flask. Add 100ml with an initial concentration of 2mmol / L and pH=2.0,2.5,3.0,3.5,4.0,4.5 and 5.0. Cd(NO 3 ) 2 The solution was oscillated ultrasonically for 1 hour to disperse the adsorbent in the solution well, and then placed in a constant temperature water bath at 25°C. The round bottom flask was sealed and stirred at constant temperature. After 3 hours, the adsorbed solution was taken out and filtered with a funnel, and then filtered by atomic absorption spectroscopy. The photometer measures the concentration of residual cadmium ions in the filtrate, and then calculates the adsorption capacity of the adsorbent according to (1).

[0025] The experimental results show that the adsorption capacity of cadmium ions at pH=2.0,2.5,3.0,3.5,4.0,4.5 and 5.0 is 14.56~113.6mg / g under the temperature condition of 25℃. Among them, under the condition of pH=5.0, experimental exa...

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Abstract

The invention provides a preparation method of an adsorbent for removal of lead ions, cadmium ions, manganese ions, copper ions and other heavy metal ions in wastewater. The method is as follows: first using graphite powder as a raw material to prepare graphene oxide by concentrated sulfuric acid, potassium permanganate and hydrogen peroxide oxidation, dissolving the graphene oxide in ethanol to disperse the graphene oxide in the ethanol by means of ultrasonic, then adding a certain amount of an ammonia-functional-group-containing linear molecule, reacting in water bath at 50-80 DEG C for 12-24 hours, performing vacuum suction filtration of an obtained product, then washing with the ethanol, and then drying at 50-100 DEG C to obtain the heavy metal adsorption material. SEM (scanning electron microscope) pictures show that the adsorbent has a loose surface, and the adsorbent has a good application prospect in adsorption field. Adsorption experiments show that, under the condition of normal temperature, the adsorbent has a good adsorption capacity to the lead ions, cadmium ions, manganese ions and copper ions, and especially has a strong adsorption capacity to the lead ions, and the maximum adsorption amount can reach 370mg/g above.

Description

Technical field [0001] The invention relates to the technical field of remediation of heavy metal polluted environments, in particular to a preparation method and application of a type of heavy metal ion adsorbent. Background technique [0002] With the rapid development of modern industrial technology, the pollution of heavy metals to water bodies has become increasingly serious. Heavy metal ions are mainly released into the natural environment through industrial wastewater such as smelting and electroplating, and urban domestic wastewater, and enter the animal and plant bodies through the enrichment of the food chain, thereby threatening human health. Traditional heavy metal wastewater treatment methods mainly include chemical precipitation, ion exchange, reverse osmosis, membrane technology, distillation, electrochemical treatment, and electrodialysis. These methods have good results to a certain extent, but generally have high costs and removal rates. Low, easy to produce se...

Claims

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Application Information

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IPC IPC(8): B01J20/22B01J20/30C02F1/28C02F1/62
Inventor 张帆王波黄福
Owner JISHOU UNIVERSITY
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