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Preparation method of MCM-41 mesoporous molecular sieve with mixed doping of Bi-La-Mo-Sr

A technology of mesoporous molecular sieve and MCM-41 is applied in the field of preparation of Bi-La-Mo-Sr mixed-doped MCM-41 mesoporous molecular sieve, which can solve the problems of poor crystallinity and poor stability, and achieves low cost and simple production. , the effect of high sensitivity

Active Publication Date: 2016-12-21
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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  • Preparation method of MCM-41 mesoporous molecular sieve with mixed doping of Bi-La-Mo-Sr
  • Preparation method of MCM-41 mesoporous molecular sieve with mixed doping of Bi-La-Mo-Sr
  • Preparation method of MCM-41 mesoporous molecular sieve with mixed doping of Bi-La-Mo-Sr

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Experimental program
Comparison scheme
Effect test

Embodiment 1

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

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

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

[0042] ②, adjust the pH of the cationic template solution

[0043] Take 13.0ml of ammonia water 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 make it 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 mixed solution in a colloidal state. This process has been kept in a stirring state, so that the templating agent and silicon The source reacts completely;

[0046] ④. Transfer and crystallize...

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 filled with 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, stirred evenly and slowly added dropwise to solution A, so that the two solutions were mixed, and continued to stir for 1h. During this process, heteroatoms were adsorbed on the surface of molecular sieves; then 5mL of 0.5M dilute hydrochloric acid was added dropwise Mix C solution with 10mL of distilled water, stir for 2h, then add 10mL of distilled water dropwise, continue stirring for 2h to ensure complete hydrolysis, centrifuge, wash with deionized water, dry at 50°C, calcined at 800°C for 4h, cool naturally, and grind Finally, Bi-doped MCM-41 mesoporous molecular sieves were obtained.

Embodiment 3

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

[0057] Weigh 0.4g of MCM-41 mesoporous molecular sieve and disperse it in a beaker filled with 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, stirred evenly and slowly added dropwise to solution A, so that the two solutions were mixed, and continued to stir for 1h. During this process, heteroatoms were adsorbed on the surface of molecular sieves; then 5mL of 0.5M dilute hydrochloric acid was added dropwise Mix C solution with 10mL of distilled water, stir for 2h, then add 10mL of distilled water dropwise, continue stirring for 2h to ensure complete hydrolysis, centrifuge, wash with deionized water, dry at 50°C, calcined at 800°C for 4h, cool naturally, and grind Finally, La doped MCM-41 mesoporous molecular sieves were obtained.

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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 sieves. Background technique [0002] In the field of today's chemical products, MCM-41 molecular sieve mesoporous material is one of the more successful research results, and it has a very wide range of applications in many fields. Such as catalytic degradation, drug controlled release, degradation of organic matter and pollutants, biochemistry and other aspects have a significant impact and role. In this paper, for ordinary TiO 2 There is a problem of secondary pollution in the degradation of organic pollutants by metalloid inorganic catalysts. A simple and effective method is designed to modify MCM-41 with metal ions to obtain better stability and adsorb in the micropores of molecular sieves. The catalyst and Molecular sieves are closely combined, which avoids...

Claims

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Application Information

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Patent Type & Authority Applications(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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