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Nano grade titanium silicon molecular sieve and its synthesis technology

A titanium-silicon molecular sieve, nano-scale technology, used in the field of environmental protection and applied chemistry, can solve the problems of low ion exchange capacity, poor thermal stability and radiation resistance, and achieve high exchange capacity, thermal stability and radiation resistance Good lighting performance and reduced synthesis cost

Inactive Publication Date: 2003-07-02
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] It should be less than 0.2 μm, but the particle size of titanium-silicon molecular sieves currently synthesized is mostly above 1 μm
[0013] (3) Low ion exchange capacity, poor thermal stability and radiation resistance

Method used

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  • Nano grade titanium silicon molecular sieve and its synthesis technology
  • Nano grade titanium silicon molecular sieve and its synthesis technology
  • Nano grade titanium silicon molecular sieve and its synthesis technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Add 6% sodium hydroxide to 76% water, under continuous stirring, first add 8% tetraisopropyl titanate dropwise to the aqueous solution of sodium hydroxide, then add 10% tetraethyl orthosilicate in 0.06ml / s speed dropwise into the mixture to obtain a white colloid. Then the colloid was transferred to a simple high-pressure reactor, and the hydrothermal reaction was carried out at a temperature of 190° C. for 4 days. The obtained solid product was washed with acetone and deionized water respectively, centrifuged and dried in an oven to obtain the desired sample.

[0033] Atomic absorption spectrometry (AAS) was used to determine the concentration of the sample in 0.1M HNO 3 , In an aqueous solution of 100ppm cesium, the distribution coefficient of cesium can be as high as 36500ml / g; in an aqueous solution of 0.1M NaOH and 100ppm strontium, the distribution coefficient of strontium can be as high as 9000ml / g; in an aqueous solution of 0.1M NaOH and 100ppm lithium , the ...

Embodiment 2

[0035] Add 2% sodium hydroxide to 80% water, under continuous stirring, first add 5% tetraisopropyl titanate dropwise to the aqueous solution of sodium hydroxide, then add 13% tetraethyl orthosilicate in 0.02ml / s speed dropwise into the mixture to obtain a white colloid. Then the colloid was transferred to a simple reactor, and the hydrothermal reaction was carried out at a temperature of 140° C. for 10 days. The obtained solid product was washed with acetone and deionized water respectively, centrifuged and dried in an oven to obtain the desired sample.

[0036] Atomic absorption spectrometry (AAS) was used to determine the concentration of the sample in 0.1M HNO 3, In an aqueous solution of 100ppm cesium, the distribution coefficient of cesium can be as high as 10000ml / g. In the aqueous solution of 0.1M NaOH and 100ppm strontium, the distribution coefficient of strontium can be as high as 15000ml / g. In an aqueous solution of 0.1M NaOH and 100ppm lithium, the distribution...

Embodiment 3

[0038] Add 10% sodium hydroxide to 70% water, under continuous stirring, first add 15% tetraisopropyl titanate dropwise to the aqueous solution of sodium hydroxide, then add 5% tetraethyl orthosilicate in 0.09ml / s speed dropwise into the mixture to obtain a white colloid. Then the colloid was transferred to a simple reactor, and the hydrothermal reaction was carried out at 250° C. for 4 days. The obtained solid product was washed with acetone and deionized water respectively, centrifuged and dried in an oven to obtain the desired sample.

[0039] Atomic absorption spectrometry (AAS) was used to determine the concentration of the sample in 0.1M HNO 3 , In an aqueous solution of 100ppm cesium, the distribution coefficient of cesium can be as high as 11000ml / g. In the aqueous solution of 0.1M NaOH and 100ppm strontium, the distribution coefficient of strontium can be as high as 8000ml / g. In an aqueous solution of 0.1M NaOH and 100ppm lithium, the distribution coefficient for ...

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Abstract

A nanometre-class TiSi molecular sieve for removing pollutants of heavy metals and radioactive substance from environment and purifying nuclein has a mole formular Na1+ / -xTi1.5+ / -ySi1+ / -zO5, where x=0.01-0.2, y=0.1-0.5 and z=0.1-0.2. It is prepared from tetrabutyl titanate or tetraisopropyl titanate, ethyl n-silicate, sodium hydroxide and water jointly by the sol-gel method and the hydrothermal synthesis method. Its advantages are fine crystal grain, high reaction activity, low cost, high exchange capacity with radioactive elements and heavy metals, and high thermal stability and radioactive resistance.

Description

technical field [0001] The invention relates to a titanium-silicon molecular sieve and a synthesis process thereof. The molecular sieve is mainly used for removing radioactive pollutants and heavy metal pollutants in the environment or performing nuclide purification, and belongs to the technical fields of environmental protection and applied chemistry. Background technique [0002] Molecular sieves have a wide range of industrial applications in the separation of gas and liquid molecules, ion exchange, and catalytic reactions due to their uniform microporous structure and the ability to select appropriate molecules to enter their framework. With the continuous increase of industrial demand, people are designing and synthesizing the skeleton structure of molecular sieves and the size and shape of pores. The research on titanium-silicon molecular sieves has developed rapidly in recent years. In the early 1980s, Taramasso (TaramassoM, PeregoG, NotariB, US4410501, 1983) of Enic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/18B01J29/89C01B37/06
Inventor 于波陈靖宋崇立
Owner TSINGHUA UNIV
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