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Integral type CG-ZIF-8 metal organic framework foam material as well as preparation method and application thereof

A CG-ZIF-8, metal organic framework technology, used in chemical instruments and methods, water/sludge/sewage treatment, adsorbed water/sewage treatment, etc., can solve the problem that MOFs materials do not have thermoplastic, acid-base solution resistance It can improve the resistance of acid solution, realize environmental friendliness, and improve the resistance of acid solution.

Active Publication Date: 2021-05-25
CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the crystallization products of MOFs are powdery solids, and MOFs materials do not have defects such as thermoplasticity and poor tolerance to acid-base solutions, which greatly limit the application of MOFs materials in the field of sample pretreatment.

Method used

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  • Integral type CG-ZIF-8 metal organic framework foam material as well as preparation method and application thereof
  • Integral type CG-ZIF-8 metal organic framework foam material as well as preparation method and application thereof
  • Integral type CG-ZIF-8 metal organic framework foam material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The preparation of embodiment 1, CG-ZIF-8 foam material

[0033] according to figure 1 The shown procedure prepares CG-ZIF-8 foam.

[0034] Prepare 50 mL of 19.5% carboxymethyl cellulose and 0.5% dextran hydrosol, and stir evenly. Dissolve (6.568g) 2-methylimidazole in the prepared hydrosol, then add 2.975g zinc nitrate hexahydrate, and use a high-speed paddle machine to continuously stir the system for 12 hours. After the reaction is completed, the sol is obtained after centrifugal purification - Gel-like carboxymethylcellulose / dextran-ZIF-8 material (CG-ZIF-8). Carboxymethylcellulose / dextran-ZIF-8 sol-gel was subjected to vacuum degassing for 30 min, then rapidly frozen and cooled to -80°C for pre-freezing (1.0 h). Then, the carboxymethylcellulose / dextran-ZIF-8 sol-gel that was initially freeze-solidified was vacuum freeze-dried for 72 hours to obtain monolithic (cylindrical) white foamy carboxymethylcellulose / Dextran-ZIF-8 material (CG-ZIF-8).

[0035] The mass...

Embodiment 2

[0038] Example 2. Application of CG-ZIF-8 foam material for adsorption and purification of five environmental endocrine disruptors (bisphenol A, bisphenol B, bisphenol S, bisphenol AF and nonylphenol) in drinking water

[0039] Using tap water and bottled purified water as the sample matrix, prepare 5 kinds of environmental endocrine disruptors (bisphenol A, bisphenol B, bisphenol S, bisphenol AF) with a concentration of 0.50mg / L-100. and nonylphenol) to be tested.

[0040] Such as image 3 As indicated, 1.0 g of the CG-ZIF-8 material prepared in Example 1 was weighed and added to 1.0 L of the test solutions of five environmental endocrine disruptors at different concentrations, and stirred for 2.0 h. After the adsorption is completed, the CG-ZIF-8 foam water purification material is taken out, and the concentration of the remaining environmental endocrine disruptors in the sample is determined. The residual concentration test results were fitted by nonlinear regression usin...

Embodiment 3

[0044] Example 3, CG-ZIF-8 foam adsorption material as repeated regeneration application of water purification material

[0045] Using tap water and bottled water as test water samples, take out the CG-ZIF-8 material prepared in Example 1, which has completed the adsorption of five environmental endocrine disruptors in the water sample for the first time, and use a NaOH solution with a concentration of 1M to regenerate the material, and then Use 15mL of methanol and 15mL of acetonitrile to soak the material for 10 minutes respectively, then take out the material, dry it at 45°C under normal pressure, and then recycle it for the next time. Repeat the cycle for a total of 5 times, and test the water sample to be tested after each adsorption is completed. The remaining concentration of environmental endocrine disruptors in the environment and calculate the recovery efficiency.

[0046] Such as Figure 4 As shown in (a), the adsorption rate (AR%) of ZIF-8 to five environmental en...

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Abstract

The invention discloses an integral type CG-ZIF-8 metal organic framework foam material as well as a preparation method and application thereof. The preparation method of the foam material comprises the following steps: taking a mixed solution of carboxymethyl cellulose and glucan as a self-assembly medium of ZIF-8, performing in-situ synthesis on ZIF-8 to obtain sol-gel type ZIF-8, and performing vacuum freeze drying to obtain the foam material. The CG-ZIF-8 material has good mechanical stability and chemical stability while the traditional advantages of large specific surface area, high porosity and the like of the ZIF type material are ensured, and overcomes the defect of acid sensitivity of the traditional ZIF-8 type material. The CG-ZIF-8 material has good selective adsorbability to environmental endocrine disruptors (hormones) (the maximum adsorption capacities are as follows: BPA is equal to 29.98 mg / g, BPB is equal to 29.12 mg / g, BPS is equal to 36.35 mg / g, BPAF is equal to 28.83 mg / g, and NP is equal to 23.41 mg / g). In addition, the integral type CG-ZIF-8 material has the advantages of simplicity in operation, easiness in regeneration (the recovery rates of the adsorption material to the five environmental endocrine disruptors after five times of recycling are all greater than 80%) and convenience in recovery. The CG-ZIF-8 material has a good prospect when being correspondingly used for adsorbing and removing various endocrine disruptors in environmental water.

Description

technical field [0001] The invention relates to an integral CG-ZIF-8 metal-organic framework foam material and its preparation method and application, belonging to the technical field of new nanometer materials. Background technique [0002] The issue of water resource safety has become a public health issue of worldwide concern. In recent years, the problem of various environmental endocrine disruptors represented by bisphenol A as harmful pollutants in water has gradually intensified. These endocrine disruptors, as a class of environmental hormones, It is widely sourced from various drinking water and food plastic packaging, and can enter the human body through multiple channels such as drinking water and food intake, causing endocrine dysfunction in the body, leading to metabolic diseases and even cancer, and seriously endangering human health. There are many kinds of compounds such as environmental endocrine disruptors with small molecular weight, and they exist in trace...

Claims

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Application Information

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IPC IPC(8): C08G83/00C08J9/28C02F1/28C08L87/00
CPCC08G83/008C08J9/28C02F1/285C08J2387/00C08J2201/0484
Inventor 江海洋王嗣涵沈建忠夏曦王战辉李建成郑丕苗王梓乐张亮熊进城
Owner CHINA AGRI UNIV
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