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Preparation of cyclodextrin metal organic framework carbon material and application of cyclodextrin metal organic framework carbon material to water treatment

A metal-organic framework and cyclodextrin technology, applied in the field of environmental pollution remediation, can solve problems such as cyclodextrin metal-organic framework water instability, and achieve the effect of fast adsorption rate and high adsorption capacity

Inactive Publication Date: 2018-10-19
CHINA AGRI UNIV
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Problems solved by technology

[0005] The purpose of the present invention is to propose a preparation and application method of a cyclodextrin metal organic framework carbon material, which can not only solve the problem of cyclodextrin metal organic framework water instability, but also inherit its porosity and surface rich in oxygen Features of functional groups

Method used

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  • Preparation of cyclodextrin metal organic framework carbon material and application of cyclodextrin metal organic framework carbon material to water treatment
  • Preparation of cyclodextrin metal organic framework carbon material and application of cyclodextrin metal organic framework carbon material to water treatment
  • Preparation of cyclodextrin metal organic framework carbon material and application of cyclodextrin metal organic framework carbon material to water treatment

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preparation example Construction

[0029] 2. Preparation of cyclodextrin metal-organic framework carbon materials

[0030] Dissolve 6.5g of γ-cyclodextrin and 2.25g of potassium hydroxide in 100mL of deionized water, sonicate for 10min, then place the solution in a closed container at room temperature, and place a container filled with liquid methanol in the closed container In an open container, with the volatilization of methanol, a methanol atmosphere is formed in a closed container. After being placed in this atmosphere for a week, the solution slowly crystallizes. After washing the obtained white crystals with methanol for 3 times, they are dried for 24 hours, which is the γ-ring Dextrin metal-organic frameworks.

[0031] Put the dried γ-cyclodextrin metal-organic framework in an atmosphere furnace and burn it at 600°C for 5 hours under the protection of nitrogen. The heating rate is 1°C / min. After cooling to room temperature, take it out. The method is carried out under the protection of nitrogen, and th...

Embodiment 1

[0036] Take 44 15mL glass centrifuge tubes and divide them into 11 groups. Each group has three parallel samples and one control sample. Cadmium(II) ion solution (the background solution is 10mM NaCl solution), and then 10mg of cyclodextrin metal organic framework carbon material was added to each group of three parallel samples. The reaction time is 1 h, the reaction temperature is 25° C., and the shaking rate is 150 rpm. After the reaction finishes, filter, get the supernatant, use graphite furnace atomic absorption spectrophotometer to detect the concentration of cadmium after diluting according to certain multiple, the result sees Figure 5 . The results show that the cyclodextrin metal-organic framework carbon material of the present invention has a specific adsorption effect on cadmium (II) ions in water, and can remove almost 100%.

Embodiment 2

[0038] Referring to the steps in Example 1, the initial concentration of cadmium was set to 50 mg / L, and a series of cyclodextrin metal organic framework carbon materials with different concentrations were added. The adsorption results are shown in Image 6 , the preferred addition amount of the cyclodextrin metal organic framework carbon material in water is 0.1-2 g / L. Further preferably, the cyclodextrin metal-organic framework carbon material has a concentration range of 0.5-1 g / L in water, so that the adsorption of cadmium is more thorough and economical.

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Abstract

The invention provides preparation of a cyclodextrin metal organic framework carbon material and application of the cyclodextrin metal organic framework carbon material to water treatment. The preparation method comprises the following steps: firstly, enabling gamma-cyclodextrin and potassium hydroxide to react, so as to obtain a gamma-cyclodextrin metal organic framework (gamma-CD MOF); then carrying out high-temperature firing on the gamma-cyclodextrin metal organic framework under the protection, so as to obtain the cyclodextrin metal organic framework carbon material. According to the material provided by the invention, firstly, the problem that the gamma-CD MOF is not stable in water can be solved; secondly, the material can inherit porous properties of the gamma-CD MOF and the surface has abundant oxygen-containing functional groups, so that the material can be used as a novel water body heavy metal ion repairing material.

Description

technical field [0001] The present invention generally relates to the field of environmental pollution remediation, and in particular to a preparation and application method of a cyclodextrin metal organic framework carbon material. Background technique [0002] Cadmium is a very common heavy metal in industry, mainly from mining, electroplating, smelting, batteries and coatings. Cadmium poses a great threat to human health. First, cadmium that enters the human body cannot be degraded. Second, cadmium exposure may cause cancer, kidney damage, bone damage, and hematuria. According to statistics, the cadmium pollution situation in my country's farmland is very serious, covering an area of ​​more than 13,000 hectares, involving 25 regions in 11 provinces and cities. According to my country's farmland irrigation water quality standard (GB5084-2005), the total cadmium content in irrigation water should not exceed 0.01mg / L. The average annual consumption of irrigation water in r...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/28B01J20/30C02F1/28C02F101/20
CPCB01J20/20B01J20/28054B01J20/3078C02F1/283C02F2101/20
Inventor 刘东晖刘畅王鹏周志强
Owner CHINA AGRI UNIV
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