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Nano-dephosphorizer, preparation method and application of same

A phosphorus removal agent, nano technology, applied in the direction of nano technology, nano technology, chemical instruments and methods, etc., to achieve the effect of fast adsorption rate, good selectivity and remarkable effect

Inactive Publication Date: 2018-04-06
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation of La(OH) 3 and La 2 (CO 3 ) 3 Co-precipitation method is always used, and only micron-sized products can be obtained

Method used

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  • Nano-dephosphorizer, preparation method and application of same
  • Nano-dephosphorizer, preparation method and application of same
  • Nano-dephosphorizer, preparation method and application of same

Examples

Experimental program
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Effect test

Embodiment 1

[0038] At 200mM La(NO 3 ) 3Add 10 g of 1-butyl-3-methylimidazolium tetrafluoroborate (bmimBF 4 ) ionic liquid, keep the system temperature at 20°C, add 100mL of 0.5mol / L NaHCO dropwise to the solution under rapid stirring 3 solution, adjust the pH of the reaction to 8, react continuously for 2 hours, and then stand at room temperature for 12 hours. Separated by filtration under reduced pressure, washed with distilled water and ethanol for 3 times, dried at 60°C, and ground to obtain the nano-phosphorus removal agent lanthanum carbonate hydrate, and its scanning electron microscope (SEM) is as follows: figure 1 As shown, it can be seen from the SEM spectrum that the prepared lanthanum carbonate sample has an irregular sheet-like structure, and the particle size ranges from tens to hundreds of nanometers.

Embodiment 2

[0040] in 50mM LaCl 3 ·7H 2 Add 5g bmimBF to 800mL aqueous solution of O 4 , keep the system temperature at 30°C, add 200mL of 1mol / L Na 2 CO 3 solution, adjust the pH of the reaction to 10, react continuously for 2 hours, and then stand at room temperature for 12 hours. Separated by filtration under reduced pressure, washed with distilled water and ethanol for 3 times, dried at 60°C, and ground to obtain the nano-phosphorus removal agent lanthanum carbonate hydrate, and its transmission electron microscope (TEM) is as follows: figure 2 As shown, it can be seen from the TEM spectrum that the average particle size of lanthanum carbonate hydrate is less than 10 nanometers, and the shape is a mixed particle of rod type + sheet type.

Embodiment 3

[0042] at 50mM La 2 (AC) 3 Add 2g bmimBF to 100mL aqueous solution 4 , keep the system temperature at 40°C, add 100mL of 0.1mol / L NaHCO dropwise to the solution under rapid stirring 3 solution, adjust the pH of the reaction to 7, continue to react for 1 h, and then stand at room temperature for 2 h. Separated by filtration under reduced pressure, washed with distilled water and ethanol for 3 times, dried at 35°C, and ground to obtain the nano-phosphorus removal agent lanthanum carbonate hydrate. Its thermogravimetric analysis (TGA) is as follows: image 3 As shown, from the TGA spectrum, it can be seen that the prepared lanthanum carbonate sample has three stages of weight loss on heating, which is consistent with La 2 (CO 3 ) 3 ·8H 2 O thermal decomposition process, so the nano phosphorus removal agent lanthanum carbonate hydrate prepared in this embodiment should be La 2 (CO 3 ) 3 ·8H 2 O.

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Abstract

The invention provides a nano-dephosphorizer lanthanum carbonate hydrate, La2(CO3)3.nH2O, 1 <= n <= 8. The invention also provides a preparation method of the nano-dephosphorizer lanthanum carbonate hydrate. The method includes steps of: 1) adding an ionic liquid to a metal lanthanum ion solution with stirring to form a mixed solution; 2) adding a precipitant to the mixed solution to perform a precipitation reaction, and performing after-treatment to a reaction product to obtain the nano-dephosphorizer lanthanum carbonate hydrate, which is more than 100 mg / L in maximum saturation adsorption capacity and has strong removal capability on low-content phosphorus components in ecologic water domains, living or industrial wastewater, etc. After treatment, content of phosphates in the water sample can reach national first-level emission standard of phosphates. The nano-dephosphorizer has important significance for alleviating the gaining pressure of phosphorus environment pollution and a problem of daily production and domestic water.

Description

technical field [0001] The invention belongs to the field of environmental wastewater treatment, and in particular relates to a nano-scale dephosphorization agent, a preparation method thereof and the application of phosphorus removal in low-phosphorus wastewater. Background technique [0002] Environmental hotspot issues of global concern Water eutrophication refers to the phenomenon of water pollution caused by excessive nutrient salts such as N and P in water. Eutrophication of the water body will cause algae and other plankton to multiply rapidly, forming algal blooms or red tides, resulting in reduced water transparency, supersaturation of dissolved oxygen, and reduction of dissolved oxygen in the water, resulting in mass death of aquatic animals, deterioration of water quality, and pollution of water resources. Seriously affect human life and social and economic development. [0003] Phosphorus is recognized as the limiting factor that determines the productivity of w...

Claims

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Application Information

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IPC IPC(8): B01J20/02B01J20/28B01J20/30C02F1/28C02F1/58C02F101/10
CPCC02F1/281C02F2101/105C01F17/247C01F17/10B82Y40/00B82Y30/00C02F1/5245C01P2004/16C01P2004/24C01P2004/64Y02W10/10
Inventor 黄梅路一帆夏炎吴华威
Owner ZHEJIANG UNIV
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