Polyamine-modified UiO-66 composite adsorbent capable of efficiently purifying trace phosphorus and arsenic in water, and preparation method for adsorbent

A composite adsorption, uio-66 technology, applied in chemical instruments and methods, adsorption water/sewage treatment, other chemical processes, etc., to achieve high cycle stability, low rate of decline in adsorption efficiency, and improve the effect of advanced treatment capacity

Active Publication Date: 2015-07-22
NANJING UNIV OF INFORMATION SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can exist stably in the gas phase environment, but its stability in the solvent is not ideal

Method used

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  • Polyamine-modified UiO-66 composite adsorbent capable of efficiently purifying trace phosphorus and arsenic in water, and preparation method for adsorbent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (1) Dissolve 0.05 g of polyethyleneimine (PEI) in 1 mL of methanol and stir evenly for 10 min to fully dissolve to obtain a mixed solution. Slowly add 0.2 g of UiO-66 to the above mixed solution while stirring to make It dissolves and reacts. After the reaction is complete, it is dried at room temperature for 2 h under nitrogen protection, and then the temperature is raised to 110 ° C under vacuum program, and dried for 24 h.

[0037] (2) The above-mentioned dried composite material was washed with deionized water, centrifuged at 3000 r / min for 30 min, and repeated 4 times until the supernatant was clear and colorless, and then vacuum-dried at 60 °C for 24 h.

[0038] The PEI modified UiO-66 composite adsorbent prepared by this embodiment has a PEI immobilization capacity of 10%. Experiments show that the composite adsorbent prepared above has obvious removal effect on arsenate in water. When the content of arsenate in the water body is 5mg / L, the competing ion NO 3 ...

example 2

[0040] (1) Dissolve 0.075 g of polyethyleneimine (PEI) in 2.5 mL of ethanol, stir evenly for 5 min to fully dissolve to obtain a mixed solution, and slowly add 0.2 g UiO-66 to the above mixed solution while stirring to make It dissolves and reacts, and after the reaction is complete, it is dried at room temperature under nitrogen protection for 12 h, and then heated to 150 °C in a vacuum program, and dried for 16 h.

[0041] (2) The above-mentioned dried composite material was washed with deionized water, centrifuged at 8000r / min for 15min, repeated 5 times until the supernatant was clear and colorless, and then vacuum-dried at 80°C for 16h.

[0042] The PEI-modified UiO-66 composite adsorbent prepared by this embodiment has a PEI immobilization capacity of 20%. Experiments show that the composite adsorbent prepared above has obvious removal effect on arsenate in water. When the content of arsenate in the water body is 8 mg / L, the competing ion NO 3 ? / Cl ? / SO 4 2? Conc...

example 3

[0044] (1) Dissolve 0.1 g of polyethyleneimine (PEI) in 5 mL of isopropanol, stir evenly for 40 min to fully dissolve to obtain a mixed solution, slowly add 0.2 g of UiO-66 to the above mixed solution while stirring , to make it dissolve and react. After the reaction was complete, it was dried at room temperature under nitrogen protection for 8 h, and then the temperature was raised to 60°C under vacuum, and dried for 12 h.

[0045] (2) The above-mentioned dried composite material was washed with deionized water, centrifuged at 3000 r / min for 60 min, and repeated 4 times until the supernatant was clear and colorless, and then vacuum-dried at 60 °C for 48 h.

[0046] The PEI-modified UiO-66 composite adsorbent prepared by this embodiment has a PEI immobilization capacity of 35%. Experiments show that the composite adsorbent prepared above has obvious removal effect on phosphate in water. When the phosphate content in the water body is 10 mg / L, the competing ion NO 3 ? / Cl ?...

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Abstract

The invention relates to a polyamine-modified UiO-66 composite adsorbent capable of efficiently purifying trace phosphorus and arsenic in water, and a preparation method for the adsorbent. The preparation method comprises the following steps: dissolving a polyamine compound in a solvent, uniformly stirring to enable the compound to be fully dissolved to obtain a mixed solution, slowly adding organometallic framework UiO-66 into the mixed solution while stirring to enable the organometallic framework UiO-66 to be dissolved and reacted, drying at room temperature under nitrogen protection after the completion of the reaction, and performing heat drying under vacuum to remove the solvent to obtain a composite material; washing the composite material with deionized water, carrying out centrifugation till a supernatant becomes clear and colorless, and performing heat drying under vacuum to obtain the polyamine-modified UiO-66 composite adsorbent. The polyamine-modified UiO-66 composite adsorbent provided by the invention can efficiently purify trace phosphorus and arsenic in water, and greatly improves the adsorption property and the adsorption capacity as compared with those of an ordinary UiO-66 adsorbent.

Description

technical field [0001] The invention belongs to the field of preparation of ionic pollutant adsorbents in water, and in particular relates to a polyamine compound-modified metal-organic framework composite material capable of efficiently purifying trace amounts of phosphorus and arsenic in water and a preparation method thereof. Background technique: [0002] Arsenic is an important industrial raw material and a highly toxic pollutant, which has teratogenic, carcinogenic and mutagenic effects on the human body and other organisms. The chemical industry, non-ferrous metal mining and smelting, and electronic industry production have caused more and more arsenic elements to enter the soil and water bodies in the form of acid radical anions, seriously threatening the growth of animals and plants that are healthy for humans. Phosphorus is one of the most important factors that limit the growth of crops, but too high a concentration of phosphorus will cause eutrophication of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/22B01J20/30C02F1/28C02F1/58
Inventor 邱慧刘乐乐许正文徐敬生陈旭斌赵云霞于江华梁晨刘刚
Owner NANJING UNIV OF INFORMATION SCI & TECH
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