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Preparation method and use of lanthanum coordinated diamino-functionalized mesoporous silica film

A silicon dioxide membrane and diamino technology, which is used in the preparation of lanthanum-coordinated diamino functionalized mesoporous silica membranes and the field of adsorption and separation of phosphate ions in water, can solve the problems of cumbersome preparation process, poor selectivity, mechanical Poor performance and other problems, to achieve the effect of simple preparation process, low manufacturing cost and high crystallinity

Inactive Publication Date: 2019-01-15
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are few reports related to membrane materials at present, and there are common problems such as cumbersome preparation process, poor selectivity, and poor mechanical properties.

Method used

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  • Preparation method and use of lanthanum coordinated diamino-functionalized mesoporous silica film
  • Preparation method and use of lanthanum coordinated diamino-functionalized mesoporous silica film
  • Preparation method and use of lanthanum coordinated diamino-functionalized mesoporous silica film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] (1) Dissolve 10 g of medical absorbent cotton in 40 wt % sulfuric acid, and stir at 35° C. for 3 h. Afterwards, the hydrolysis process was terminated by diluting with 1500 ml of cold deionized water and allowed to stand overnight. The supernatant was discarded and the cellulose was centrifuged. Subsequently, the remaining white suspension was washed 3 times to remove soluble cellulosic material and placed in a dialysis bag (MWCO 11000-15000) for 2-5 days (up to pH = 2.4). The final solid product was diluted in water and dispersed by sonication for 10 minutes before use.

[0051] (2) 10 mL of the CNCs suspension (pH=2.4) obtained in step 1 was sonicated for 10 min. 100 mg of anhydrous glucose was added to the CNCs and stirred at 20 °C for 0.5 h, after which 400 μL of tetramethoxysilane (TMOS) was added to the mixture suspension. The mixture suspension was stirred at 25 °C for 2 h. Afterwards, the homogeneous mixture was poured into polystyrene Petri dishes (d=90mm) a...

Embodiment 2

[0069] (1) Dissolve 10 g of medical absorbent cotton in 50 wt % sulfuric acid, and stir at 45° C. for 2 h. Afterwards, the hydrolysis process was terminated by diluting with 1500 ml of cold deionized water and allowed to stand overnight. The supernatant was discarded and the cellulose was centrifuged. Subsequently, the remaining white suspension was washed 3 times to remove soluble cellulosic material, and then placed in a dialysis bag (molecular weight cut-off 11000-15000) for 2-5 days (until pH = 2.4). The final solid product was diluted in water and dispersed by sonication for 10 minutes before use.

[0070] (2) 15 mL of the CNCs suspension (pH=2.4) obtained in step 1 was sonicated for 20 min. 150 mg of anhydrous glucose was added to the CNCs and stirred at 25 °C for 1 h, after which 600 μL of tetramethoxysilane (TMOS) was added to the mixture suspension. The mixture suspension was stirred at 25 °C for 2.5 h. Afterwards, the homogeneous mixture was poured into polystyre...

Embodiment 3

[0088] (1) Dissolve 10 g of medical absorbent cotton in 60 wt % sulfuric acid, and stir at 55° C. for 1 h. Afterwards, the hydrolysis process was terminated by diluting with 1500 ml of cold deionized water and allowed to stand overnight. The supernatant was discarded and the cellulose was centrifuged. Subsequently, the remaining white suspension was washed 3 times to remove soluble cellulosic material, and then placed in a dialysis bag (molecular weight cut-off 11000-15000) for 2-5 days (until pH = 2.4). The final solid product was diluted in water and dispersed by sonication for 30 minutes before use.

[0089] (2) 20 mL of the CNCs suspension (pH=2.4) obtained in step 1 was sonicated for 10 min. 200 mg of anhydrous glucose was added to the CNCs and stirred at 30 °C for 1 h, after which 1000 μL of tetramethoxysilane (TMOS) was added to the mixture suspension. The mixture suspension was stirred at 30 °C for 3 h. Afterwards, the homogeneous mixture was poured into polystyren...

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Abstract

The invention belongs to the field of material preparation technology and separation technology, and relates to a preparation method and use of a lanthanum-coordinated diamino functionalized mesoporous silica film in phosphorus adsorption in a water body. The lanthanum-coordinated diamino-functionalized mesoporous silica film is prepared by first preparing a CNCs / silicon film from cellulose nanocrystals (CNCs) as a template and tetramethoxysilane (TMOS) as a silicon source by solvent evaporation self-assembly method and then removing CNCs by calcinations. The amino-functionalized mesoporous silica film is prepared by a post-synthesis grafting method and finally a lanthanum coordination method. The adsorption of phosphoric acid in the water body is carried out by an oscillating method, andthe lanthanum-coordinated diamino functionalized mesoporous silica film has excellent adsorption properties. The lanthanum-coordinated diamino functionalized mesoporous silica film has the advantagesthat the lanthanum-coordinated diamino functionalized mesoporous silica film is obtained by a simple preparation method, and has large adsorption capacity, and the membrane material can be recovered without causing secondary pollution.

Description

technical field [0001] The invention belongs to the technical field of material preparation and separation, and relates to a preparation method of a lanthanum-coordinated diamino-functionalized mesoporous silicon dioxide film and its application to the adsorption and separation of phosphate ions in water bodies. Background technique [0002] Today, human activities frequently cause water eutrophication. For biological cells, phosphorus is an important component of molecules in cells, and constitutes the skeleton of phospholipids, nucleotides, nucleic acids, and coenzymes, so the decisive factor causing eutrophication is also the content of phosphorus in water bodies. Due to the rapid development of industry and agriculture, if the industrial wastewater is discharged into lakes, estuaries, bays and other slow-flowing water bodies without treatment, the phosphorus element required by organisms will cause algae and plankton to multiply rapidly. The growth cycle of algae and pl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/10B01J20/28C02F1/28C02F101/10
CPCB01J20/103B01J20/28033B01J20/28083C02F1/281C02F2101/105
Inventor 景旋汪云云程汝佳王吉祥闫永胜
Owner JIANGSU UNIV
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