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A kind of preparation method of bi‑la‑mo‑SR mixed doping MCM‑41 mesoporous molecular sieve

A mesoporous molecular sieve, MCM-41 technology, applied in the field of preparation of Bi-La-Mo-Sr mixed doped MCM-41 mesoporous molecular sieve, can solve the problems of poor stability and poor crystallinity, and achieve simple production and low cost , to avoid the effect of secondary pollution

Active Publication Date: 2018-01-02
太湖县市场监督检验所(太湖县功能膜检测研究院)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because MCM-41 is in an amorphous state, its stability is relatively poor in the presence of water vapor and high temperature due to its poor crystallinity

Method used

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  • A kind of preparation method of bi‑la‑mo‑SR mixed doping MCM‑41 mesoporous molecular sieve
  • A kind of preparation method of bi‑la‑mo‑SR mixed doping MCM‑41 mesoporous molecular sieve
  • A kind of preparation method of bi‑la‑mo‑SR mixed doping MCM‑41 mesoporous molecular sieve

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Experimental program
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Effect test

Embodiment 1

[0039] 1. Preparation of MCM-41 mesoporous molecular sieve:

[0040] ① Use CTAB as a single template to prepare a uniform solution of cationic template

[0041] Weigh 2.2g of CTAB with an electronic balance, add it to the pre-measured beaker A containing 43ml of distilled water, and stir evenly with a magnetic stirrer;

[0042] ② Adjust the pH of the cationic template solution

[0043] Take 13.0ml of ammonia and 67.0ml of 95% ethanol in beaker B and stir evenly, pour the liquid in beaker B into beaker A, and adjust the pH to 7-8;

[0044] ③. Add inorganic silicon source to polycondensate with organic template

[0045] Slowly add 4.4ml of ethyl silicate (TEOS) dropwise to the pH-adjusted solution, and stir at room temperature for 2 hours to make the final mixture become colloidal. This process keeps stirring so that the template and silicon The source reaction is complete;

[0046] ④ Transfer and crystallize the completely reacted sol solution

[0047] Move the colloidal solution mixed sol...

Embodiment 2

[0053] Preparation of Bi-doped MCM-41 mesoporous molecular sieve:

[0054] Weigh 0.4g of MCM-41 mesoporous molecular sieve and disperse it in a beaker containing 35mL of 95% ethanol to form solution A, stir for 30min until the solution is completely mixed; then weigh 7.6g of bismuth chloride and disperse it in 15mL of 95% ethanol. % Ethanol, stir well and slowly add dropwise to solution A to mix the two solutions, and continue to stir for 1 hour. During this process, the heteroatoms are adsorbed on the surface of the molecular sieve; then dropwise add 5mL 0.5M dilute hydrochloric acid C solution composed of 10mL distilled water and stirring for 2h, then add 10mL distilled water dropwise, after the hydrolysis is complete, continue to stir for 2h, centrifuge, wash with deionized water, dry at 50℃, calcined at 800℃ for 4h, cool naturally, and obtain Bi after grinding Doped with MCM-41 mesoporous molecular sieve.

Embodiment 3

[0056] Preparation of La-doped MCM-41 mesoporous molecular sieve:

[0057] Weigh 0.4g of MCM-41 mesoporous molecular sieve and disperse it in a beaker containing 35mL of 95% ethanol to form solution A, stir for 30min until the solution is completely mixed; then weigh 5.2g of lanthanum chloride and disperse it in 15mL of 95% ethanol. % Ethanol, stir well and slowly add dropwise to solution A to mix the two solutions, and continue to stir for 1 hour. During this process, the heteroatoms are adsorbed on the surface of the molecular sieve; then dropwise add 5mL 0.5M dilute hydrochloric acid C solution composed of 10mL of distilled water and stirring for 2h, then add 10mL of distilled water dropwise, after the hydrolysis is complete, continue to stir for 2h, centrifuge, wash with deionized water, dry at 50℃, calcined at 800℃ for 4h, cool naturally, and obtain La after grinding. Doped with MCM-41 mesoporous molecular sieve.

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Abstract

The invention relates to the technical field of adsorption and degradation of organic pollutants and particularly relates to a preparation method of a MCM-41 mesoporous molecular sieve with mixed doping of Bi-La-Mo-Sr. The preparation method includes the steps of: dispersing MCM-41 mesoporous molecular sieve in ethanol to obtain a solution A and stirring the solution until the components are uniformly mixed; weighing lanthanum chloride, bismuth chloride, ammonium molybdate tetrahydrate, and strontium nitrate, dispersing the compounds in ethanol, and uniformly stirring the mixture and slowly dropwise adding the mixture to the solution A to mix the two solutions with continuous stirring; and dropwise adding dilute hydrochloric acid and distilled water, stirring the liquid again, dropwise adding distilled water and continuously stirring the mixture to ensure complete hydrolysis. In the invention, the MCM-41 is modified by means of metal ions, so that degradation characters of the metal ions is maintained and secondary pollution of metal ions to water is avoided, thus reducing cost of filtering and purifying secondary water greatly. The molecular sieve has better practicability.

Description

Technical field [0001] The invention relates to the technical field of adsorption and degradation of organic pollutants, in particular to a preparation method of Bi-La-Mo-Sr mixed doped MCM-41 mesoporous molecular sieve. Background technique [0002] In the field of chemical products today, MCM-41 molecular sieve mesoporous material is one of the more successful results of research, and it has extremely wide applications in many fields. Such as catalytic degradation, controlled drug release, degradation of organic matter and pollutants, biochemistry, etc., have significant influence and effect. In this article, for ordinary such as TiO 2 The degradation of organic pollutants by metal-like inorganic catalysts has the problem of secondary pollution. A simple and effective method was designed to modify MCM-41 with metal ions to achieve better stability. The catalyst is adsorbed in the pores of molecular sieve. The molecular sieve is tightly combined to avoid the difficulty of treat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/00C01B37/00B01J20/10
CPCB01J20/103C01B37/00C01B39/00C01P2002/72C01P2002/88C01P2004/03C01P2004/62C01P2006/17
Inventor 阳杰朱仁发肖新国王章彪熊晨梅俊杰汪国正王春王乐吴佳玲翟云海
Owner 太湖县市场监督检验所(太湖县功能膜检测研究院)
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