A Ti/MCM-22/MCM-41 composite material as well as preparing method and application

A technology of MCM-41 and MCM-22, applied in the field of Ti/MCM-22/MCM-41 composite material and its preparation and application, can solve the problems of low success rate, long synthesis time, unsatisfactory hydrothermal stability, etc. , to achieve the effect of high synthesis efficiency, high success rate and simple process

Inactive Publication Date: 2008-04-09
UNIV OF SHANGHAI FOR SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In addition, the synthesis of micro / mesoporous composite molecular sieves generally adopts traditional hydrothermal synthesis technology, and the hydrothermal treatment time often takes 48-72 hours. The synthesis material requires a long time, low success rate, and unsatisfactory hydrothermal stability, which greatly affects the commercialization of such materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Preparation of MCM-22 precursor: First, add 1.5g NaOH to 200mL distilled water, stir until the solution is clear, then add 2.073g NaAlO2, continue stirring until clear, then add 12.267g hexamethylenetetramine (HMI), at room temperature Magnetically stirred for 1 hour, finally added 15g of silica gel, and continued to magnetically stir for 1 hour at room temperature. The obtained colloid was transferred to a 500W microwave hydrothermal oven and reacted at 120°C for 30 minutes. The product was washed and suction filtered, and dried overnight at 105°C to obtain MCM -22 precursor;

[0019] Preparation of MCM-41 reaction mother liquor: add 4.624g NaOH to 100mL distilled water, stir and clarify to obtain NaOH solution, add 11.845g cetyltrimethylammonium bromide (CTAB) to 100mL distilled water, stir and clarify to obtain CTAB solution, Dissolve 12g of silica gel in NaOH solution, stir magnetically for 30min at room temperature, then add CTAB solution, and continue stirring for...

Embodiment 2

[0023]Preparation of MCM-22 precursor: First, add 1.5g NaOH to 200mL distilled water, stir until the solution is clear, then add 2.073g NaAlO2, continue stirring until clear, then add 12.267g hexamethylenetetramine (HMI), at room temperature Magnetically stirred for 1 hour, finally added 15g of silica gel, and continued to magnetically stir for 1 hour at room temperature. The obtained colloid was transferred to a 500W microwave hydrothermal oven and reacted at 120°C for 30 minutes. The product was washed and suction filtered, and dried overnight at 105°C to obtain MCM -22 precursor;

[0024] Preparation of MCM-41 reaction mother liquor: add 4.624g NaOH to 100mL distilled water, stir and clarify to obtain NaOH solution, add 11.845g cetyltrimethylammonium bromide (CTAB) to 100mL distilled water, stir and clarify to obtain CTAB solution, Dissolve 12g of silica gel in NaOH solution, stir magnetically for 30min at room temperature, then add CTAB solution, and continue stirring for ...

Embodiment 3

[0028] Preparation of MCM-22 precursor: First, add 1.5g NaOH to 200mL distilled water, stir until the solution is clear, then add 2.073g NaAlO2, continue stirring until clear, then add 12.267g hexamethylenetetramine (HMI), at room temperature Magnetically stirred for 1 hour, finally added 15g of silica gel, and continued to magnetically stir for 1 hour at room temperature. The obtained colloid was transferred to a 500W microwave hydrothermal oven and reacted at 120°C for 30 minutes. The product was washed and suction filtered, and dried overnight at 105°C to obtain MCM -22 precursor;

[0029] Preparation of MCM-41 reaction mother liquor: add 4.624g NaOH to 100mL distilled water, stir and clarify to obtain NaOH solution, add 11.845g cetyltrimethylammonium bromide (CTAB) to 100mL distilled water, stir and clarify to obtain CTAB solution, Dissolve 12g of silica gel in NaOH solution, stir magnetically for 30min at room temperature, then add CTAB solution, and continue stirring for...

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Abstract

The invention relates to composite material taking micro / mesoporous composite molecular sieves as carriers and loading semiconductor elements, a preparation method and an application of composite material taken as photocatalyst. In order to overcome the respective limitation of a microporous molecular sieve and a mesoporous molecular sieve, simultaneously through the integration of the adsorption of molecular sieves and the photocatalysis of a semiconductor, the invention provides Ti / MCM-22 / MCM-41 composite material taking the microporous-mesoporous composite molecular sieves as the carriers and loading TiO2, and the invention synthesizes the composite material by adopting the synthesis technology of a microwave-hydrothermal method. The Ti / MCM-22 / MCM-41 composite material can be taken as photocatalyst of the effluent purification. Organic pollutant bisphenol A being difficult to be degraded is removed by adopting 0.1 g / l dosage of the composite material, in order that bisphenol A solution of 1000 ppb degrades to 1 ppb for five hours under the general illumination condition, and can degrade to 1 ppb for one hour under the sun illumination condition.

Description

technical field [0001] The invention relates to a composite material which takes micro / mesoporous composite molecular sieve as carrier and supports semiconductor elements, its preparation method and its application as photocatalyst. Background technique [0002] The photocatalytic technology developed with the help of nanomaterial technology provides new opportunities for the thorough purification of refractory organic pollutants. where TiO 2 It is favored by people for its high activity, good thermal stability, long duration, low price, and harmless to human body, and has become the most valued photocatalyst. But nano TiO 2 The particles are so small that it is easy to cause waste with water loss in the process of wastewater treatment, and it is difficult to recycle. Therefore, using molecular sieves as carriers and loading TiO 2 The catalyst gradually takes its place. [0003] In semiconductor-molecular sieve photocatalysts, molecular sieves used as carriers are gener...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/80B01J29/70B01J21/06
Inventor 郝思秋陶红王璐周仕林王瑞濮
Owner UNIV OF SHANGHAI FOR SCI & TECH
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