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Method for treating phosphate radicals in water body by utilizing Bi-MOF-polymer compound

A technology of polymers and composites, applied in water/sewage treatment, water treatment parameter control, chemical instruments and methods, etc., can solve the problems of low phosphate adsorption capacity and difficult recovery, and achieve broad industrial application prospects and economic efficiency Good, simple operation process

Active Publication Date: 2020-10-02
DONGGUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to solve the problems of low phosphate adsorption capacity and difficult recovery of conventional adsorbents, the present invention proposes a method for treating phosphate in water with Bi-MOF materials and polymer composites. High efficiency and good economy

Method used

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  • Method for treating phosphate radicals in water body by utilizing Bi-MOF-polymer compound

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 3mmol trimesic acid (H 3 BTC) was dissolved in 30ml methanol (MeOH) solution, while 1mmol bismuth nitrate pentahydrate (Bi(NO 3 ) 3 ·5H 2 O) Dissolve in 30ml N after grinding, in N-dimethylformamide (DMF), after fully dissolving respectively, mix the two evenly to obtain Bi 3+ -H 3 BTC mixed solution.

[0024] The mixed solution was transferred to a 100ml reaction kettle, placed in a constant temperature oven and heated to 125°C, and the reaction time was 24h to obtain product A;

[0025] The above product A was repeatedly filtered and washed with anhydrous methanol and N,N-dimethylformamide, and dried at 65°C to obtain the final product Bi-MOF;

[0026] Put 1 g of Bi-MOF in 10% polyacrylonitrile (PAN) solution (1 g polyacrylonitrile, 9 g N, N-dimethylformamide), stir for 1 h to make it uniform, and then freeze-dry for 24 h to obtain Bi- MOF / PAN composite;

[0027] The above-mentioned adsorbent Bi-MOF / PAN composite was used in the phosphate adsorption experiment,...

Embodiment 2

[0029] 3 mmol of 2,6-pyridinedicarboxylic acid and 1 mmol of bismuth nitrate pentahydrate (Bi(NO 3 ) 3 ·5H 2 O) be dissolved in 30ml methanol (MeOH) solution respectively, accelerate its homogeneous dispersion by supersonic treatment respectively for 20 minutes, then both are mixed homogeneously, obtain Bi 3+ -H 3 BTC mixed solution.

[0030] The mixed solution was transferred to a 100ml reaction kettle, placed in a constant temperature oven and heated to 125°C, and the reaction time was 24h to obtain product A;

[0031] The above product A was repeatedly filtered and washed with anhydrous methanol, and dried at 65°C to obtain the final product Bi-MOF;

[0032]Bi-MOF1g was placed in 20% polyvinylidene fluoride (PVDF) solution (2g polyacrylonitrile, 8g N, N-dimethylacetamide), stirred for 1h to make it uniform, and then vacuum dried for 24h to obtain Bi- MOF / PVDF composite;

[0033] The above-mentioned adsorbent Bi-MOF / PVDF composite was used in the phosphate adsorption e...

Embodiment 3

[0035] Put the Bi-MOF / PAN composite in Example 1 into the natural water body polluted by phosphate, wherein the test water body found that the chloride ion content was 96mg / L, the sulfate content was 25mg / L, and the phosphate content was 21mg / L, the total organic carbon content is 27mg / L; by putting 20g Bi-MOF / PAN composite into 100mL of the natural water body, after stirring and adsorption, the separation test found that the adsorption amount of phosphate was 39mg / g.

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Abstract

The invention relates to a method for treating phosphate radicals in a water body by utilizing a Bi-MOF-polymer compound, and belongs to the technical field of water treatment and the technical fieldof secondary resource recycling. The method is characterized in that the Bi-MOF-polymer compound is brought into contact with the water body containing phosphate radicals; the Bi-MOF-polymer compoundis prepared by forming a porous Bi-MOF material from a bismuth source and an organic ligand under a solvothermal condition, compounding the obtained porous Bi-MOF material with at least one polymer, and carrying out coagulation and solidification treatment to obtain the Bi-MOF-polymer compound. The Bi-MOF prepared by the method disclosed by the invention has a very high specific surface area and rich adsorption sites, conventional phosphate radical adsorption can be carried out by utilizing pore channels and the adsorption sites of the Bi-MOF, and most importantly, phosphate in a water body isenriched and separated by utilizing a principle that Bi and phosphate are complexed into bismuth phosphate.

Description

technical field [0001] The invention relates to a method for treating phosphate radicals in water by using a Bi-MOF-polymer compound, and belongs to the technical field of water treatment and the technical field of secondary resource recovery and utilization. Background technique [0002] Excess phosphate is one of the main causes of eutrophication of water bodies, especially in lakes and slow-flowing rivers, eutrophication and the overgrowth of cyanobacteria (commonly known as red tide) are also due to excess phosphate pollution. Detergents, paint formulations, water treatment, the electronics industry, mineral processing, and the excessive use of agricultural fertilizers are major sources of phosphate. Phosphate pollution will seriously threaten human and ecological health. The concentration of 0.03mgP / L is the standard for algae growth in lakes and other closed water bodies. Therefore, the phosphorus-containing wastewater discharge standard must meet the concentration li...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/28B01J20/22B01J20/30
CPCC02F1/285B01J20/226C02F2101/105C02F2209/18
Inventor 李长平王刚路冰董双石
Owner DONGGUAN UNIV OF TECH
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