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Phosphorous-removing double-metal organic framework material and preparation method and application thereof

An organic framework and bimetallic technology, applied in the field of pollution control, can solve the problems of low efficiency of phosphorus removal by adsorption, low reusability, difficulty in meeting emission standards, etc., achieve excellent phosphorus removal effect, great practical application value, excellent The effect of reusability

Active Publication Date: 2019-10-08
SOUTHWEST UNIVERSITY
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0003] Existing phosphorus removal technologies in sewage treatment plants mainly include biological phosphorus removal, chemical precipitation phosphorus removal and adsorption phosphorus removal. Among them, biological phosphorus removal and chemical precipitation phosphorus removal are costly and difficult to meet discharge standards
Adsorption phosphorus removal is simple, efficient and low-cost, and has become a widely used phosphorus removal method. Common adsorbents include steel slag, surface-modified zeolite, ferrihydrite, red mud, metal oxides, etc. These adsorbents Although it is convenient, easy to obtain, and economical, its adsorption and phosphorus removal efficiency is not high and its reusability is low. Therefore, it is necessary to design efficient and simple phosphorus removal adsorbents. Metal-organic frameworks (MOFs) are a class of porous materials. Coordination polymers self-assembled from organic ligands and inorganic metal ions or metal ion clusters have the characteristics of high porosity, low density and large specific surface area, and can directly adsorb pollutants in water

Method used

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  • Phosphorous-removing double-metal organic framework material and preparation method and application thereof
  • Phosphorous-removing double-metal organic framework material and preparation method and application thereof
  • Phosphorous-removing double-metal organic framework material and preparation method and application thereof

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Embodiment 1

[0029] The synthesis of embodiment 1 bimetallic organic framework material

[0030] 1 mmol ferric chloride hexahydrate FeCl 3 ·6H 2 O (0.271g), 1mmol zirconium chloride ZrCl 4 (0.233g) and 2mmol (0.362g) 2-aminoterephthalic acid NH 2 Dissolve BDC in 40mL N,N'-dimethylformamide DMF, then add 0.2g PVP (K 30), stir until it is completely dissolved, and after ultrasonication for 30min, transfer the mixed solution to the reaction kettle and heat to 150 After reacting at ℃ for 24 hours, take it out and cool it down to room temperature, wash it alternately with DMF and ethanol for 3 times, and dry it in an oven at 90℃ for 12 hours to obtain a bimetallic framework material, which is denoted as MOF(Fe 1 -Zr 1 ). By changing the ratio of iron element content to zirconium element content to 2:1 and 1:2 respectively, and the total content of iron and zirconium to 2 mmol, the bimetallic frame material MOF (Fe 2 -Zr 1 ) and MOF (Fe 1 -Zr 2 ).

[0031] NH 2 - Synthesis of Fe-MOF: ...

Embodiment 2

[0038] Example 2 Study on Phosphorus Adsorption Properties of Bimetallic Organic Framework Materials

[0039] 1. MOF (Fe 1 -Zr 1 ), MOF(Fe 1 -Zr 2 ) and MOF (Fe 2 -Zr 1 ) Phosphorus adsorption efficiency

[0040] In addition to the above three materials, in order to further reflect the beneficial effects of bimetallic frame materials, we also set NH 2 -Fe-MOF, NH 2 -Zr-MOF two comparison groups, under the same conditions (pH=7, temperature 25°C, phosphate concentration 50mg / L, material dosage 2mg), oscillate at 180rpm for 24h in a shaker, the solution is subjected to 0.22 After filtering with a μm filter membrane, measure the phosphorus concentration and calculate the adsorption capacity. The results are as follows: Figure 4 shown. MOF(Fe 1 -Zr 1 ), MOF(Fe 2 -Zr 1 ), MOF(Fe 1 -Zr 2 ), NH 2 -Fe-MOF and NH 2 The adsorption capacities of the five materials of -Zr-MOF from high to low are 222.4mg / g, 199.9mg / g, 109.7mg / g, 107.1mg / g, 91.2mg / g.

[0041] For further...

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Abstract

The invention belongs to the field of pollution treatment and particularly relates to a phosphorous-removing double-metal organic framework material and a preparation method and application thereof. The double-metal organic framework material is prepared by using iron salt, zirconium salt and 2-aminoterephthalic acid as the raw materials and PVP as the auxiliary through a solvothermal method. Thedouble-metal organic framework material is excellent in phosphorous removing effect due to fact that Fe and Zr in the material and phosphate form Fe-O-P / Zr-O-P through ligand exchange, the amino in the material has a static adsorption effect on phosphate and surface or active sites have a chelating effect. The prepared double-metal organic framework material can still have an adsorption removing rate of 80% or above after being reused for 10 times and is excellent in regenerability and reusability and huge in practical application value.

Description

technical field [0001] The invention belongs to the field of pollution control, and in particular relates to a phosphorus-removing bimetallic organic framework material and a preparation method and application thereof. Background technique [0002] Phosphorus is one of the widely used nutrient elements. However, excessive consumption of phosphorus-containing products will inevitably cause water pollution, and phosphorus is often regarded as one of the main controlling factors for water eutrophication. Improper use of phosphorus products may cause serious eutrophication of water bodies. Therefore, it is of great significance to study simple and efficient methods for phosphorus removal. [0003] Existing phosphorus removal technologies in sewage treatment plants mainly include biological phosphorus removal, chemical precipitation phosphorus removal and adsorption phosphorus removal. Among them, biological phosphorus removal and chemical precipitation phosphorus removal are co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/22B01J20/30C02F1/28C02F101/10
CPCB01J20/226C02F1/285C02F2101/105
Inventor 黄玉明陈红成奉萍
Owner SOUTHWEST UNIVERSITY
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