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Iron/cobalt duplex-metal organic framework material as well as preparation method and application thereof

An organic framework and bimetallic technology, applied in the field of iron/cobalt bimetallic organic framework materials and their preparation, can solve the problems of poor dispersion performance and diffusivity, insufficient active center sites, incomplete degradation of pollutants, etc., and achieve easy recycling Utilization, short reaction time, easy-to-achieve effects

Active Publication Date: 2018-12-21
HANGZHOU DIANZI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the applicant's research found that in the process of zero-valent iron catalytic activation of PS, the surface will form Fe 3 o 4 , α-FeOOH, α-Fe 2 o 3 Corrosion layers such as FeO and FeO inhibit the activation of PS and the further degradation of pollutants
while using Fe 3 o 4 , Fe 2 o 3 As a catalyst, it has the disadvantages of poor dispersion performance and diffusivity. In the process of activating PS, there are problems such as insufficient active center sites, low catalytic activity, and long reaction cycle, which lead to incomplete degradation of pollutants.

Method used

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  • Iron/cobalt duplex-metal organic framework material as well as preparation method and application thereof
  • Iron/cobalt duplex-metal organic framework material as well as preparation method and application thereof
  • Iron/cobalt duplex-metal organic framework material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Preparation of Fe / Co Bimetallic Organic Frameworks (Fe / Co Bimetallic MOFs)

[0045] (1) Preparation of precursor solution: 1.746g (6mM) Co(NO 3 ) 2 ·6H 2 O, 1.194g FeCl 2 4H 2 O (6mM) and 1.994g (12mM) terephthalic acid (BDC) were dissolved in 60mL of N,N-dimethylformamide (DMF), and then 2.4mL of hydrofluoric acid (HF) was added, and the above mixture The solution was stirred until completely dissolved to obtain a precursor solution;

[0046] (2) Preparation of iron / cobalt bimetallic MOFs: Transfer the precursor solution prepared in step (1) to a 100mL polytetrafluoroethylene-lined autoclave, put the autoclave into a programmed oven, and heat the solvent at 150 °C Thermal reaction for 24 hours; cooling, naturally cooling down to room temperature, vacuum pump filtration, repeated washing with absolute ethanol, N, N-dimethylformamide (DMF) and deionized water to obtain a reddish-brown precipitate; put the precipitate at 100°C Dry in a vacuum oven for 12 hours to ob...

Embodiment 2

[0049] Preparation of Fe / Co Bimetallic Organic Frameworks (Fe / Co Bimetallic MOFs)

[0050] (1) Preparation of precursor solution: 2.095g (7.2mM) Co(NO 3 ) 2 ·6H 2 O, 0.954g (4.8mM) FeCl 2 4H 2 O and 1.994g (12mM) terephthalic acid (BDC) were dissolved in 60mL of N,N-dimethylformamide (DMF), then 2.4mL of hydrofluoric acid (HF) was added, and the above mixture was stirred until Completely dissolve to obtain a precursor solution;

[0051] (2) Preparation of iron / cobalt bimetallic MOFs: Transfer the precursor solution prepared in step (1) to a 100 mL polytetrafluoroethylene-lined autoclave, put the autoclave into a programmed oven, Thermal reaction for 24 hours; cooling, naturally cooling down to room temperature, vacuum pump filtration, repeated washing with absolute ethanol, N, N-dimethylformamide (DMF) and deionized water to obtain a reddish-brown precipitate; put the precipitate at 100°C Dry in a vacuum oven for 12 hours to obtain a reddish-brown solid powder, which is ...

Embodiment 3

[0054] Preparation of Fe / Co Bimetallic Organic Frameworks (Fe / Co Bimetallic MOFs)

[0055] (1) Preparation of precursor solution: 1.946g (6mM) Co(NO 3 ) 2 ·6H 2 O, 1.194g FeCl 2 4H 2 O (6mM) and 1.329g (8mM) terephthalic acid (BDC) were dissolved in 60mL of N,N-dimethylformamide (DMF), and then 2.4mL of hydrofluoric acid (HF) was added, and the above mixture The solution was stirred until completely dissolved to obtain a precursor solution;

[0056] (2) Preparation of iron / cobalt bimetallic MOFs: Transfer the precursor solution prepared in step (1) to a 100 mL polytetrafluoroethylene-lined autoclave, put the autoclave into a programmed oven, Thermal reaction for 24 hours; cooling, naturally cooling down to room temperature, vacuum pump filtration, repeated washing with absolute ethanol, N, N-dimethylformamide (DMF) and deionized water to obtain a reddish-brown precipitate; put the precipitate at 100°C Dry in a vacuum oven for 12 hours to obtain a reddish-brown solid powd...

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PUM

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Abstract

The invention relates to an iron / cobalt duplex-metal organic framework material as well as a preparation method and application thereof. The preparation method comprises the steps: dissolving cobalt nitrate hexahydrate, iron dichloride tetrahydrate and terephthalic acid into N,N dimethyl formamide to obtain a precursor solution; performing hydrothermal reaction on the precursor solution for 14 to27 h under the temperature of 110 to 170 DEG C; cooling, washing and drying to obtain the iron / cobalt duplex-metal organic framework material. Duplex transition metal coordination sites which are highly dispersed in the prepared iron / cobalt duplex-metal organic framework material disclosed by the invention can enhance effective contact between the iron / cobalt duplex-metal organic framework material and persulfate and can efficiently catalyze the persulfate to generate sulfate radicals; thus, persistent organic pollutants in wastewater can be removed. The iron / cobalt duplex-metal organic framework material is suitable for treating varieties of organic wastewater and has the advantages of high activity, small use amount, wide application pH range, good durability, convenience in operation and environmental friendliness and wide prospect in treating toxic and harmful organic wastewater which is difficult to biodegrade.

Description

technical field [0001] The invention belongs to the technical field of water pollution control, and in particular relates to an iron / cobalt bimetallic organic framework material and its preparation method and application. Background technique [0002] Entering the 21st century, my country's social economy has developed rapidly and people's living standards have been continuously improved, but the water environment has continued to deteriorate. Water pollution not only causes huge economic losses, but also directly endangers people's lives. With the increasing types and quantities of pollutants discharged into the environment, it is difficult to meet the increasingly stringent emission requirements using traditional biochemical treatment methods. Based on the sulfate radical (SO 4 －· ) advanced oxidation technology (SR-AOPs) is a new type of water treatment technology that has attracted much attention in recent years. This technology activates persulfate PS (including per...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G83/00B01J31/16B01J31/22
CPCB01J31/1691B01J31/223B01J2531/842B01J2531/845C08G83/008
Inventor 李欢旋杜佳
Owner HANGZHOU DIANZI UNIV
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