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A compound modification method of zeolite and its application in removing phosphate in water

A composite modification and zeolite technology, applied in the field of water treatment, can solve the problems of low exchange capacity and difficult to remove anionic pollutants, and achieve the effect of reducing production cost and improving application value.

Active Publication Date: 2019-12-27
LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the presence of water molecules and other impurities in the molecular pores of natural zeolite, the exchange capacity is too low; and the silicon-aluminum structure itself is negatively charged, so it is difficult for natural zeolite to remove anionic pollutants in water

Method used

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  • A compound modification method of zeolite and its application in removing phosphate in water
  • A compound modification method of zeolite and its application in removing phosphate in water
  • A compound modification method of zeolite and its application in removing phosphate in water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Preparation of zeolite: 10g of fly ash and 8g of anhydrous sodium carbonate were accurately weighed with an electronic balance, mixed and ground in a mortar for 30 minutes, then placed in a crucible, and calcined in a muffle furnace at 550°C for 2 hours. Add the mixture to 2mol / L sodium hydroxide solution and heat it in a water bath at 80°C for 10h. The product is washed with water until neutral, shaken with 0.01mol / L dilute hydrochloric acid solution for 6h, and then washed repeatedly with deionized water of pH 6.0, then 60°C at low temperature Dry for 24 hours to obtain a synthetic zeolite sample.

[0021] Take the above 2g of zeolite and add it to 50ml of 0.002mol / L β-cyclodextrin solution, shake it in an air bath for 24 hours, wash it with water, centrifuge, place it in a watch glass, and dry it in a constant temperature drying oven at 50°C for 20 hours to prepare β-cyclodextrin. Cyclodextrin organically modified zeolite; then take 2g of β-cyclodextrin organically m...

Embodiment 2

[0024] Preparation of zeolite: Accurately weigh 10g of fly ash and 8g of anhydrous sodium carbonate with an electronic balance, mix them, grind them in a mortar for 30 minutes, place them in a crucible, and calcinate them in a muffle furnace at 600°C for 2 hours. Add the mixture to 2mol / L sodium hydroxide solution and heat it in a water bath at 80°C for 10h. The product is washed with water to neutrality, shaken with 0.01mol / L dilute hydrochloric acid solution for 6h, and then washed repeatedly with deionized water with pH 6.5. Dry for 24 hours to obtain a synthetic zeolite sample.

[0025] Take the above 2g of zeolite and add it to 50ml of 0.01mol / L β-cyclodextrin solution, shake it in an air bath for 24 hours, wash it with water, centrifuge, put it in a watch glass, and dry it in a constant temperature drying oven at 50°C for 20 hours to prepare β-cyclodextrin. Cyclodextrin organically modified zeolite; then take 2g of β-cyclodextrin organically modified zeolite in 50ml of 0...

Embodiment 3

[0028] Preparation of zeolite: 10g of fly ash and 8g of anhydrous sodium carbonate were accurately weighed with an electronic balance, mixed and ground in a mortar for 30 minutes, then placed in a crucible, and calcined in a muffle furnace at 550°C for 2 hours. Add the mixture to 2mol / L sodium hydroxide solution and heat it in a water bath at 85°C for 12h. The product is washed with water to neutrality, shaken with 0.01mol / L dilute hydrochloric acid solution for 6h, and then repeatedly washed with deionized water with pH 6.0. Dry for 28 hours to obtain a synthetic zeolite sample.

[0029] Take the above 2g of zeolite and add it to 50ml of 0.015mol / L β-cyclodextrin solution, shake it in an air bath for 24 hours, wash it with water, centrifuge, put it in a watch glass, and dry it in a constant temperature drying oven at 45°C for 22 hours to prepare β-cyclodextrin. Cyclodextrin organically modified zeolite; then take 2g of β-cyclodextrin organically modified zeolite in 50ml of 0....

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Abstract

The invention relates to a compound modification method for zeolite and application of the modified zeolite to removal of phosphate radicals in water. The compound modification method comprises the following steps: grinding fly ash for a certain period of time and then preparing synthetic zeolite by using a high-temperature alkali fusion process and a hydrothermal process, adding a proper amount of the synthetic zeolite into a beta-cyclodextrin solution with a certain concentration, carrying out shaking for a certain period of time, and then successively carrying out washing with distilled water, filtering, centrifugation and low-temperature drying so as to obtain beta-cyclodextrin modified zeolite; and adding a proper amount of the beta-cyclodextrin modified zeolite into a zirconium sulfate solution with a certain concentration, carrying out shaking for a certain period of time, and then successively carrying out washing with distilled water, filtering, centrifugation and low-temperature drying so as to obtain zeolite having undergone compound modification by an inorganic metal salt and organic matters. Beta-cyclodextrin increases the number of hydroxyl groups on the surface of the zeolite, and a metal zircon salt increases positive charges on the surface of the zeolite; and the obtained modified zeolite has good removal effect on phosphate radicals in water.

Description

technical field [0001] The invention belongs to the field of water treatment, and in particular relates to a compound modification method of zeolite and an application for removing phosphate radicals in water. Background technique [0002] Zeolite is a kind of hydrous alkali metal or alkaline earth metal aluminosilicate mineral. The synthesis speed of natural zeolite is slow, and the mining is limited by zeolite content and beneficiation method, which makes the synthesis of artificial zeolite very urgent. Due to the existence of water molecules and some other impurities in the molecular pores of natural zeolite, the exchange capacity is too low; and the silicon-aluminum structure itself is negatively charged, so it is difficult for natural zeolite to remove anion pollutants in water. Therefore, it is necessary to modify the zeolite to achieve the purpose of increasing the specific surface area of ​​the zeolite and improving the adsorption performance. Surface modification i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/24C01B39/02C02F1/28B01J20/30C02F101/10
CPCB01J20/0211B01J20/0281B01J20/186B01J20/24B01J2220/46C01B39/026C01P2004/03C02F1/288C02F2101/105
Inventor 邓慧刘云刘永民候翰然曹芸
Owner LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY
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