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Mesoporous composite material for degrading formaldehyde and preparation method thereof

A composite material and mesoporous technology, applied in the field of formaldehyde-degrading mesoporous composite materials and their preparation, can solve the problems of ineffective degradation of high-concentration formaldehyde, activity limitation, etc., and achieve high-efficiency adsorption and degradation capacity, large adsorption capacity, high active effect

Active Publication Date: 2019-01-18
青岛天恺工贸有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, nano-TiO 2 The photodegradation of formaldehyde is a contact reaction, due to the nano-TiO 2 It does not have a large specific surface area and high adsorption activity, so the removal rate of formaldehyde is limited by the adsorption to nano-TiO 2 The amount of formaldehyde on the particle surface; in addition, nano-TiO 2 It has high activity against low-concentration formaldehyde, but it cannot effectively degrade high-concentration formaldehyde. At the same time, single nano-TiO 2 The activity in the photocatalytic reaction process is also greatly limited

Method used

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preparation example Construction

[0028] The embodiment of the present invention discloses a method for preparing a mesoporous composite material for degrading formaldehyde, comprising the following steps: dissolving the platinum source compound in deionized water, and stirring to obtain the first solution; 2 / Al-MCM-41 is ultrasonically dispersed in the first solution, stirred, and then continued to stir in a water bath at 80°C to obtain a paste solid; dry and grind the paste solid, Calcined to get Pt-TiO 2 / Al-MCM-41 composite material. As a preferred solution, the platinum source compound is platinum dichlorotetraammine. Get Pt-TiO 2 In the step of / Al-MCM-41 composite material, the drying temperature of the paste solid is preferably 90-130°C, more preferably 100-120°C, more preferably 110°C; the drying time is preferably 3-10h, more preferably It is preferably 4-8h, more preferably 5h; the calcination temperature is preferably 310-340°C, more preferably 320°C; the calcination time is preferably 1-5h, m...

Embodiment 1

[0045] (1) Preparation of matrix mesoporous material Al-MCM-41. First weigh 2g of cetyltrimethylammonium bromide and 1g of polyethylene glycol 4000 and dissolve them in 100mL of deionized water, stir and dissolve them evenly in a water bath at 50°C, then weigh 2.08g of orthosilicic acid Ethyl ester and 0.102g of aluminum isopropoxide were added to the above solution, and the pH value of the above solution was adjusted to 10.0 to obtain a milky white sol. The obtained sol was transferred to a reaction kettle for hydrothermal reaction at 110°C. After 24 hours of reaction, suction filtration, The solid product was obtained by washing and drying, and the solid product was calcined at 550 °C for 6 h at a temperature program rate of 1 °C / min to obtain Al-MCM-41 mesoporous material. The Si / Al molar ratio in the material was 20, and the obtained matrix Al- The pore diameter of MCM-41 mesoporous material is concentrated at 3.2nm, and the pore volume is 0.9cm 3 / g, the specific surface...

Embodiment 2

[0049] (1) Preparation of matrix mesoporous material Al-MCM-41. First weigh 2g of cetyltrimethylammonium bromide and 1g of polyethylene glycol 4000 and dissolve them in 100mL of deionized water, stir and dissolve them evenly in a water bath at 50°C, then weigh 2.08g of orthosilicic acid Ethyl ester and 0.051g of aluminum isopropoxide were added to the above solution, and the pH value of the above solution was adjusted to 11.0 to obtain a milky white sol. The obtained sol was transferred to a reaction kettle for hydrothermal reaction at 120°C. After 32 hours of reaction, suction filtration, The solid product was obtained by washing and drying, and the solid product was calcined at 550 °C for 6 h at a temperature program rate of 1 °C / min to obtain Al-MCM-41 mesoporous material. The Si / Al molar ratio in the material was 40, and the obtained matrix Al- The pore diameter of MCM-41 mesoporous material is concentrated at 3.8nm, and the pore volume is 1.1cm 3 / g, the specific surface...

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Abstract

The invention provides a mesoporous composite material for degrading formaldehyde and a preparation method thereof; with a mesoporous Al-MCM-41 as a matrix material, the matrix mesoporous material has relatively high activity and relatively large specific surface area through Al doping, and the specific surface area of the Pt-TiO2 / Al-MCM-41 composite material is high, so the relatively high adsorption ability of the composite material is ensured. In addition, the size increase of nanoparticles is effectively prevented by using a pore passage confinement effect of the mesoporous material, and high reaction activity is ensured; and at the same time, nano TiO2 is subjected to surface modification by using a noble metal Pt, and the photocatalyst reaction activity is further improved. Therefore, the prepared mesoporous composite material has high-efficiency adsorption and degradation abilities to high-concentration formaldehyde.

Description

technical field [0001] The invention relates to the technical field of inorganic catalytic materials, in particular to a mesoporous composite material for degrading formaldehyde and a preparation method thereof. Background technique [0002] According to a report issued by the World Health Organization, indoor air pollution is the number one killer that endangers the health of modern families. Eliminating indoor air pollution is the key to promoting the health of modern homes. Scientists from all over the world have taken overcoming indoor air pollution as a research topic. [0003] The traditional removal methods of indoor harmful gases such as formaldehyde and benzene series are generally removed through ventilation, placing green plants, and using activated carbon. The removal method is mainly physical adsorption. The use of solid activated carbon to remove indoor harmful gases is based on the porous characteristics of activated carbon, which can have a strong adsorptio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/24B01J31/00B01J29/03C01B39/04B01D53/85B01D53/72B01J20/30
CPCB01D53/72B01D53/85B01D2251/95B01D2257/708B01J20/0203B01J20/06B01J20/18B01J20/24B01J29/0325B01J31/003B01J35/004B01J2220/42B01J2229/18C01B39/04Y02A50/20
Inventor 魏亮
Owner 青岛天恺工贸有限责任公司
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