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Preparation of graphene oxide adsorption material modified by dendritic polymer

An adsorption material and dendritic technology, which is applied in the field of adsorbent preparation, can solve the problem of reducing the possibility of renewable circulation, and achieve the effect of strong adsorption capacity and large application space.

Inactive Publication Date: 2014-06-18
JISHOU UNIVERSITY
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

Madadrang et al. used EDTA to modify graphene oxide to prepare adsorption materials with strong chelating ability [C.J. Madadrang, H. Y. Kim, G. Gao, et.al. Adsorption Behavior of EDTA-Graphene Oxide for Pb (II) Removal. ACS Appl. Mater. Interfaces, 2012, 4, 1186-1193], the maximum adsorption capacity of this adsorbent to divalent lead is 480mg / g, but the possibility of renewable cycle is relatively reduced due to the strong chelating ability of this adsorbent

Method used

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  • Preparation of graphene oxide adsorption material modified by dendritic polymer
  • Preparation of graphene oxide adsorption material modified by dendritic polymer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] First, dissolve graphene oxide in ethanol at room temperature, mix it evenly by ultrasonication for 1 hour, add it to a 500ml three-necked flask, and then add a certain amount of ethanol-dissolved dendrimer. The mass ratio of the reactant is graphene oxide : dendrimer: ethanol = 1:3:120, in the process of adding dendrimer, it can be found that the two react violently, indicating that the reaction is in progress, and the 2.0 generation polyamidoamine dissolves quickly. The whole reaction was continuously mechanically stirred in a water bath at 80°C. After the reaction was carried out for 24 hours, the resulting substance was filtered under reduced pressure and washed with ethanol three times. After drying at 80°C for 12 hours, the compound having both carboxyl and amino groups was obtained. Dendritic polymer modified graphene oxide adsorption material. In order to ensure the completeness of the reaction and improve the ability of the adsorbent to adsorb heavy metal ions,...

experiment example 2

[0021] Weigh 0.1g of the adsorbent prepared in Experimental Example 1 and place it in a 250ml dry round-bottomed flask, add 100ml of the initial concentration to be 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 of Pb(NO 3 ) 2 solution, ultrasonically oscillate for 1 hour to make the adsorbent well dispersed in the solution, then place it in a constant temperature water bath at 25°C, seal the round bottom flask, and stir at a constant temperature. After 3 hours, take the adsorbed solution and filter it with a funnel. A photometer measures the concentration of lead ions remaining in the filtrate, and then calculates the adsorption capacity of the adsorbent according to equation (1).

[0022] The experimental results show that: at a temperature of 25°C and a pH of 4.5, the adsorbent prepared in Experimental Example 1 has an adsorption capacity of 306.09 mg / g of lead ions.

experiment example 3

[0024] Weigh 0.1g of the adsorbent prepared in Experimental Example 1 and place it in a 250ml dry round-bottomed flask, add 100ml of the Cd(NO 3 ) 2 solution, ultrasonically oscillate for 1 hour to make the adsorbent well dispersed in the solution, then place it in a constant temperature water bath at 25°C, seal the round bottom flask, and stir at a constant temperature. After 3 hours, take the adsorbed solution and filter it with a funnel. The photometer measures the concentration of cadmium ions remaining in the filtrate, and then calculates the adsorption amount of the adsorbent according to (1).

[0025]The experimental results show that: at 25°C, the adsorption capacity of cadmium ions at pH=2.0, 2.5, 3.0, 3.5, 4.0, 4.5 and 5.0 is 2.3~42.24mg / g. The adsorbent prepared in the paper has the largest adsorption capacity of cadmium ion, which is 42.24mg / g.

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Abstract

The invention provides a preparation method of a new adsorbent, the method uses a dendritic polymer to modify a graphene oxide adsorption material, and the graphene oxide adsorption material modified by the dendritic polymer can effectively adsorb 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 multilayer graphene oxide by concentrated sulfuric acid, potassium permanganate and hydrogen peroxide oxidation, fully dissolving the graphene oxide in ethanol with the aid of ultrasonic, then adding a certain amount of the dendritic polymer for water bath reaction at 30-80 DEG C for 6 to 48 hours, performing vacuum suction filtration of an obtained product, then washing with the ethanol, and then drying at 50-100 DEG C to obtain a heavy metal adsorption material. SEM (scanning electron microscope) pictures show that the adsorbent has a loose structure, and the adsorbent has a good application prospect in heavy metal 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 300mg / g above.

Description

technical field [0001] The invention relates to the preparation of an adsorbent for adsorbing heavy metal ions in waste water, in particular to a preparation method of a heavy metal adsorption material. Background technique [0002] The increasingly serious water pollution has affected more than 80% of China's rivers, threatening the drinking water sources of many cities. In addition, with the development of industry, heavy metal wastewater is more and more harmful to the human body and the environment, and these heavy metals and their compounds only undergo morphological changes during the process of water migration and transformation, and will not disappear. Toxic effect. [0003] At present, the methods for treating industrial wastewater containing metal ions mainly include chemical precipitation method, ion exchange method, membrane separation method, biochemical method and adsorption method. The chemical precipitation method requires a large amount of precipitant duri...

Claims

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Application Information

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IPC IPC(8): B01J20/22B01J20/30C02F1/28C02F1/62C02F1/64
Inventor 张帆王波印风军
Owner JISHOU UNIVERSITY
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