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A kind of mof-derived clustered cerium-based phosphorus removal adsorbent and preparation method thereof

A phosphorus adsorbent and adsorbent technology, applied in the field of water pollution treatment, can solve the problems of low removal efficiency and removal rate, low phosphate sensitivity, uncertain acidity and alkalinity, and achieve good selectivity and sensitivity, excellent Acid-base tolerance, effect of improving removal rate

Active Publication Date: 2022-04-12
CHANGAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, metal salt adsorption materials have become a research hotspot in the field of phosphorus removal due to their high selectivity, simple preparation, convenient acquisition, and low cost. Most of the adsorbents are used in acidic environment, and have low sensitivity to phosphate, and the removal efficiency and removal rate are low.
In actual polluted water bodies, the situation is complicated, and its acidity and alkalinity are uncertain. Therefore, it is necessary to develop an adsorbent with a high phosphate removal rate in a wide range of acidity and alkalinity, especially for alkaline water such as seawater. High-efficiency phosphorus adsorbents in the environment have important research significance

Method used

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  • A kind of mof-derived clustered cerium-based phosphorus removal adsorbent and preparation method thereof
  • A kind of mof-derived clustered cerium-based phosphorus removal adsorbent and preparation method thereof
  • A kind of mof-derived clustered cerium-based phosphorus removal adsorbent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Step 1, press trimesic acid and Ce(NO 3 ) 3 ·6H 2 The molar ratio of O was 1:1 for the experiment. Prepare a solution of trimesic acid with a concentration of 1mol / L and a solution of cerium nitrate with a concentration of 1mol / L; mix the two solutions at a volume ratio of 1:1 to obtain a mixed solution, and place the mixed solution on a shaking table for a shaking reaction for 1.5 hours Afterwards, settle naturally for 0.5h, wash 3 times with deionized water, and then wash 2 times with absolute ethanol, the time of each washing is 5min, the rotation speed of each washing is 5000r / min, and vacuum-dry at 50°C for 7h. Get the adsorbent precursor;

[0031] Step 2: Calcining the adsorbent precursor in a nitrogen atmosphere, the heating rate of the calcination is 10°C / min, the temperature of the calcination is 500°C, and the time is 3h, to obtain the MOF-derived clustered cerium-based phosphorus removal adsorbent.

[0032] In this embodiment, in step 1, the trimesic acid...

Embodiment 2

[0034] Step 1, press trimesic acid and Ce(NO 3 ) 3 ·6H 2 The molar ratio of O was 2:1 for the experiment. Prepare a solution of trimesic acid with a concentration of 1mol / L and a solution of cerium nitrate with a concentration of 1mol / L; mix the two solutions at a volume ratio of 2:1 to obtain a mixed solution, and place the mixed solution on a shaking table for a shaking reaction for 2.5 hours Afterwards, settle naturally for 0.7h, wash 3 times with deionized water, and then wash 2 times with absolute ethanol, the time of each washing is 5min, the rotation speed of each washing is 5000r / min, and vacuum-dry at 50°C for 7h. Get the adsorbent precursor;

[0035] Step 2: Calcining the adsorbent precursor in a nitrogen atmosphere, the heating rate of the calcination is 10°C / min, the calcination temperature is 600°C, and the calcination time is 2.5h to obtain the MOF-derived clustered cerium-based phosphorus removal adsorbent.

[0036] In this embodiment, in step 1, the trimesi...

Embodiment 3

[0038] Step 1, press trimesic acid and Ce(NO 3 ) 3 ·6H 2 The molar ratio of O was 3:1 for the experiment. Prepare a 1mol / L trimesic acid solution and a 1mol / L cerium nitrate solution respectively; mix the two solutions at a volume ratio of 3:1 to obtain a mixed solution, place the mixed solution on a shaker for 3 hours after shaking , naturally settled for 0.9h, washed 3 times with deionized water, and then washed 2 times with absolute ethanol, the time of each washing was 5min, the rotation speed of each washing was 5000r / min, and vacuum-dried at 50°C for 7h to obtain Adsorbent precursors;

[0039]Step 2: Calcining the adsorbent precursor in a nitrogen atmosphere, the heating rate of the calcination is 10°C / min, the temperature of the calcination is 500°C, and the time is 3h, to obtain the MOF-derived clustered cerium-based phosphorus removal adsorbent.

[0040] In this embodiment, in step 1, the trimesic acid solution is obtained by stirring and dissolving trimesic acid ...

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Abstract

The invention discloses a MOF-derived clustered cerium-based phosphorus-removing adsorbent and a preparation method thereof, mainly comprising the following steps: preparing a trimesic acid solution and a cerium nitrate solution in molar ratios; mixing the two solutions to obtain a mixed solution , the mixed solution was placed on a shaking table for shaking reaction, then naturally settled, centrifugally cleaned, and vacuum-dried to obtain the adsorbent precursor; the adsorbent precursor was calcined in an inert atmosphere to obtain the MOF-derived clustered cerium-based dephosphorization Adsorbent. The product obtained in the present invention has a uniform MOF structure, provides a large number of effective cerium adsorption sites for the adsorption of phosphorus, can combine more phosphate, and CePO 4 It has good stability, avoids the problem of secondary release, and can prepare a stable three-dimensional cluster structure with good integrity. It can be applied to the water environment of pH 2‑12, and has excellent adsorption performance especially in alkaline environment.

Description

technical field [0001] The invention relates to the technical field of water pollution treatment, in particular to a MOF-derived clustered cerium-based phosphorus-removing adsorbent and a preparation method thereof. Background technique [0002] When a large amount of nutrients such as nitrogen and phosphorus are discharged into the water body, and the phosphate concentration in the surface water is greater than 0.01mgP / L, the water body will become eutrophic. The eutrophication of the water body can easily lead to the mass reproduction of algae and other aquatic organisms, the sharp drop of dissolved oxygen in the water body, the accumulation of organic matter, the imbalance of the ecological environment of the water body, and the release of toxic and harmful substances in the water body, which seriously endangers aquatic organisms and human health. In recent years, water eutrophication has frequently occurred in my country and even around the world and has become increasin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/22C02F1/28B01J20/30C02F101/10
CPCB01J20/226C02F1/285C02F2101/105
Inventor 何皎洁杨利伟徐雨虹胡博高晓梅李晓玲
Owner CHANGAN UNIV
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