Ferrite/graphene composite adsorbent and preparation and using methods thereof

A graphene composite, ferrite technology, applied in chemical instruments and methods, adsorption water/sewage treatment, other chemical processes, etc., can solve the decline of heavy metal ion adsorption capacity, the limitation of graphene preparation and application, and the easy occurrence of agglomeration, etc. The problem is to reduce the surface energy, the method is simple, and the energy consumption is reduced.

Inactive Publication Date: 2013-07-10
BEIJING UNIV OF CHEM TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Traditional methods often use direct or indirect calcination in the preparation of ferrite composite metal oxides, so the specific surface area of ​​ferrite composite metal oxides prepared by traditional methods is usually small, and due to the ferrite composite in the nanoscale The magnetism and high surface energy of metal oxides themselves are prone to agglomeration during the preparation and application process, which reduces their adsorption capacity for heavy metal ions. Therefore, how to avoid the use of high-temperature roasting methods to prepare iron oxides with high specific surface area

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  • Ferrite/graphene composite adsorbent and preparation and using methods thereof
  • Ferrite/graphene composite adsorbent and preparation and using methods thereof
  • Ferrite/graphene composite adsorbent and preparation and using methods thereof

Examples

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Embodiment 1

[0022] Accurate weighing of MnCl according to stoichiometric ratio 2 4H 2 O and Fe(NO 3 ) 3 9H 2 O, dissolved in 2.0 g / L graphite oxide solution, Mn in the solution2+ The concentration of metal ions is 0.1 M, Fe 3+ The concentration of metal ions is 0.2 M; another hexamethylenetetramine solution is prepared, [C 6 h 12 N 4 ]=1.0M. The graphite oxide solution containing the metal salt and the hexamethylenetetramine solution were transferred into a polytetrafluoroethylene liner, and the hydrothermal crystallization reaction was carried out at 120 °C for 10 hours. After naturally cooling to room temperature, centrifuge and wash to obtain MnFe 2 o 4 / graphene adsorbent. Among them, the mass percentage of ferrite is 34%, the size distribution of ferrite nanoparticles is 9nm, and the specific surface area of ​​the composite adsorbent is 269 m 2 / g;

[0023] The above 0.05g ferrite / graphene composite adsorbent was dispersed in the Cr-containing 6+ , Pb 2+ , Cu 2+ , Cd ...

Embodiment 2

[0025] Accurately weigh Ni(NO 3 ) 2 ·6H 2 O and Fe(NO 3 ) 3 9H 2 O, dissolved in 1.5g / L graphite oxide solution, Ni in the solution 2+ The concentration of metal ions is 0.2 M, Fe 3+ The concentration of metal ions is 0.4 M; another hexamethylenetetramine solution is prepared, [C 6 h 12 N 4 ]=2.0M. The graphite oxide solution containing the metal salt and the hexamethylenetetramine solution were transferred into a polytetrafluoroethylene liner, and the hydrothermal crystallization reaction was carried out at 150 °C for 12 hours. After naturally cooling to room temperature, centrifuge and wash to obtain NiFe 2 o 4 / graphene adsorbent. Among them, the mass percentage of ferrite is 45%, the size distribution of ferrite nanoparticles is 18nm, and the specific surface area of ​​the composite adsorbent is 251 m 2 / g;

[0026] The above 0.05g ferrite / graphene composite adsorbent was dispersed in the Cr-containing 6+ , Pb 2+ , Cu 2+ , Cd 2+ , Hg 2+ The solution was...

Embodiment 3

[0028] Accurately weigh Co(NO 3 ) 2 ·6H 2 O and Fe(NO 3 ) 3 9H 2 O, dissolved in 1.0 g / L graphite oxide solution, Co in the solution 2+ The concentration of metal ions is 0.3M, Fe 3+ The concentration of metal ions is 0.6 M; another hexamethylenetetramine solution is prepared, [C 6 h 12 N 4 ]=3.0M. The graphite oxide solution containing the metal salt and the hexamethylenetetramine solution were transferred into a polytetrafluoroethylene liner, and the hydrothermal crystallization reaction was carried out at 180 °C for 16 hours. After naturally cooling to room temperature, centrifuge and wash to obtain CoFe 2 o 4 / graphene adsorbent. Among them, the mass percentage of ferrite is 56%, the size distribution of ferrite nanoparticles is 20nm, and the specific surface area of ​​the adsorbent is 203 m 2 / g;

[0029] The above 0.05g ferrite / graphene composite adsorbent was dispersed in the Cr-containing 6+ , Pb 2+ , Cu 2+ , Cd 2+ , Hg 2+ The solution was adsorbed ...

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Abstract

The invention discloses a ferrite/graphene composite adsorbent and preparation and using methods thereof, and belongs to the technical field of adsorbents. The ferrite MFe2O4/graphene composite adsorbent is prepared by taking hexamethylenetetramine as a precipitator and a reducing agent and decomposing the hexamethylenetetramine under a hydrothermal condition to generate alkaline and reducing substances by one step. M is Mn, Ni, Co and Zn; the mass percentage of the ferrite is 40-70 percent; ferrite nano particles are dispersed on the sheet type graphene surface; the particle sizes of the ferrite nano particles are 5-30 nanometers; and the specific surface area of the ferrite/graphene composite adsorbent is 60-300 m<2>/g. The ferrite/graphene composite adsorbent has the advantages that the shortcomings of high reaction temperature, non-uniform reactants and low product structure and composition uniformity of the conventional ferrite composite metal oxide prepared by solid phase reaction are overcome; an effect of adsorbing heavy metal ions Cr<6+>, Pb<2+>, Cu<2+>, Cd<2+> and Hg<2+> in water is achieved; and a wide application prospect is realized.

Description

technical field [0001] The invention belongs to the technical field of adsorbents, in particular to a ferrite / graphene composite adsorbent and a preparation method thereof. The adsorbent is used for the adsorption of heavy metal ions. Background technique [0002] In nature, heavy metals mostly exist in the form of simple substances or compounds, so they pose little threat to ecology and humans. However, in order to meet the requirements of rapid industrial development, in recent years due to mining, industrial waste discharge, sewage irrigation and the use of metal Human factors such as human factors make the heavy metals in the environment such as lead, mercury, cadmium, etc. exceed the normal range, resulting in serious environmental pollution. At present, more than 40% of my country's land area is polluted by heavy metal ions, and it is increasing at a rate of 30%. Eventually, it will cause great harm to the human body. Among the heavy metal pollution, water pollution i...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/30C02F1/28C02F1/62
Inventor 李峰刘虹丽范国利
Owner BEIJING UNIV OF CHEM TECH
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