Modified zeolite of nano silicon dioxide mesoporous covering structure and preparation and application of modified zeolite

A technology of nano-silica and modified zeolite, which is applied in the field of zeolite, can solve the problems of complex operation and high cost of synthetic zeolite, achieve fast reaction rate, high removal rate, increase the number of micropores and the effect of specific surface area

Active Publication Date: 2018-05-15
NAT RESERACH CENT OF GEOANALYSIS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The cost of synthetic zeolite is high and the operation is complicated, which requires a process for synthesis

Method used

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  • Modified zeolite of nano silicon dioxide mesoporous covering structure and preparation and application of modified zeolite
  • Modified zeolite of nano silicon dioxide mesoporous covering structure and preparation and application of modified zeolite
  • Modified zeolite of nano silicon dioxide mesoporous covering structure and preparation and application of modified zeolite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] Example 1 Preparation of modified zeolite with silica mesoporous coating structure:

[0064] (1) Take 200g of ordinary zeolite and pass through a 180-mesh sieve to obtain 180-mesh powdered zeolite; weigh 10g of it and wash it with deionized water, then use a centrifuge to centrifuge to obtain a relatively pure zeolite, the centrifuge speed is 3000r / min, and the time is 15min; repeat Wash three times, then dry in an oven, and grind to powder to obtain pure zeolite powder.

[0065] (2) Weigh 2.0 g of the pure zeolite powder obtained in step (1) and disperse it in 50 ml of ethanol solution, add dropwise 1.415 g of tetraethyl orthosilicate solution, adjust the pH value to 10 with ammonia water, and stir magnetically in a closed state for 5 h at normal temperature, After the reaction is complete, it is centrifuged, washed with water, dried, and ground to a powder to obtain a modified zeolite powder with a silica mesoporous coating structure.

[0066] According to the BET sp...

Embodiment 2

[0068] (1) Take 200g of ordinary zeolite and pass through a 300-mesh sieve to obtain a 300-mesh powdered zeolite; weigh 10g of it and wash it with deionized water, and then use a centrifuge to centrifuge to obtain a relatively pure zeolite. The centrifuge speed is 4000r / min and the time is 10min; repeat After washing 4 times, drying in an oven, grinding to powder to obtain pure zeolite powder.

[0069] (2) Weigh 2.0 g of the pure zeolite powder obtained in step (1) and disperse it in 40 ml of ethanol solution, add dropwise 0.8 g of tetraethyl orthosilicate solution, and adjust the pH value to 10 with ammonia water. At room temperature, stir magnetically for 2 hours in a closed state. After the reaction is complete, centrifuge, wash with water, dry, and grind to powder to obtain a modified zeolite powder with a silica mesoporous coating structure.

Embodiment 3

[0071] (1) Take 200g of ordinary zeolite and pass it through a 100-mesh sieve to obtain a 100-mesh powdered zeolite; weigh 10g of it and wash it with deionized water, and then use a centrifuge to centrifuge to obtain a relatively pure zeolite. The centrifuge speed is 3000r / min and the time is 20min; repeat Wash twice, dry in an oven, and grind to powder to obtain pure zeolite powder.

[0072] (2) Weigh 2.0 g of the pure zeolite powder obtained in step (1) and disperse it in 60 ml of ethanol solution, add dropwise 1.6 g of tetraethyl orthosilicate solution, adjust the pH value to 12 with ammonia water, and stir magnetically in a closed state for 7 h at normal temperature, After the reaction is complete, it is centrifuged, washed with water, dried, and ground to a powder to obtain a modified zeolite powder with a silica mesoporous coating structure.

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Abstract

The invention discloses modified zeolite of a nano silicon dioxide mesoporous covering structure and the preparation and the application of the modified zeolite. The modified zeolite is capable of increasing the number of micropores and the specific surface area of raw zeolite, and is of a multi-stage pore structure of a new nano silicon dioxide mesoporous structure with raw zeolite micropores covered with a raw zeolite surface. According to the modified zeolite, raw pores of the raw zeolite self are not increased to produce a pore expansion effect, BET (Brunauer, Emmett and Teller) specific surface area tests show that the aperture of the modified zeolite is 1.3-10nm, and the particle size of the modified zeolite is 0.05-10mu m.

Description

technical field [0001] The invention relates to the field of zeolite, in particular to a modified zeolite with a nano-silica mesoporous coating structure and a preparation method and application thereof. Background technique [0002] Natural zeolite is a kind of porous hydrous aluminosilicate mineral, which has a frame structure, has abundant pores, large specific surface area, strong adsorption and ion exchange capacity, and has remarkable effect and stability as an adsorbent. It is cheap, green and environmentally friendly without secondary pollution, and has a wide range of applications in the field of heavy metal wastewater treatment. Natural zeolite crystals have obvious characteristics, irregular edges and corners on the surface, porous and pore structure, and are easy to adsorb heavy metal ions. However, due to the small pore size and narrow channels of the natural zeolite crystal structure, it is not easy to quickly "catch" heavy metal ions, and the narrow channels ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/02B01J20/18B01J20/28B01J20/30C02F1/28C02F101/20
CPCB01J20/103B01J20/186B01J20/28004B01J20/28083C01B39/026C01P2004/04C01P2004/61C01P2004/62C01P2004/64C01P2006/16C02F1/281C02F2101/20
Inventor 谭科艳王喆梁明会朱晓华袁欣
Owner NAT RESERACH CENT OF GEOANALYSIS
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