Preparation method of atom-level active site composite nanocatalytic fiber used for degrading indoor VOCs

Abstract

The invention discloses a preparation method of an atom-level active site composite nanocatalytic fiber used for degrading indoor VOCs. At first, noble metal base active site catalysts are prepared byimpregnation method, and then doped into the polymer fiber by electrospinning technology, the composite nanocatalytic fiber is synthesized, while the high catalytic activity of the atom-level activesite catalyst is maintained, so as to realize the combination of the atom-level active site catalyst into an excellent macrostructure capable of maintaining its own high catalytic activity, and strengthen the application of the atom-level active site catalyst. As that method is simple in operation and low in cost, the composite nanofibers can be used to synthesize clothing, air-conditioning filterscreen, wallpaper and so on, so that clothing, air-conditioning and wallpaper can not only realize their original value, but also be used as a novel air purification equipment to realize the effective control of indoor VOCs such as formaldehyde and benzene series by catalytic oxidation technology at room temperature, thus improving indoor air quality.

Description

technical field

[0001] The invention belongs to the technical field of catalysts and the field of VOCs pollution control, and relates to a preparation method and application of a composite nano-catalytic fiber with atomic-level active sites, in particular to a preparation method of a precious metal-based atomic-level active site composite nano-catalytic fiber And its application in catalytic degradation of indoor VOCs at room temperature. Background technique

[0002] With the development of the economy and the improvement of people's living standards, people's requirements for interior decoration have also increased. A large number of building materials and coatings that can generate volatile organic compounds (VOCs) have also entered the room with interior decoration, causing indoor air pollution. decline in quality. According to the definition of GB 50325-2010 "Code for Indoor Environmental Pollution Control of Civil Construction Engineering", indoor air VOCs include ben...

Examples

preparation example Construction

[0040] As shown in the accompanying drawings, a method for preparing an atomic-level active site composite nano-catalytic fiber for degrading indoor VOCs of the present invention comprises the following steps:

[0041] 1) Preparation of noble metal-based atomic-level active site catalysts:

[0042] Disperse the rare earth metal oxide powder used as a catalyst carrier in distilled water, add a salt or acid solution containing the active component of the noble metal, and mix to form the first dispersion; then, ultrasonically adjust the pH with sodium carbonate solution, stir and heat until All the water is evaporated to dryness, and the active atoms of the noble metal in the obtained precipitate are evenly loaded on the rare earth metal oxide carrier; the obtained precipitate is washed with distilled water and absolute ethanol in sequence, dried in an oven, and finally calcined in a horse boiling furnace. Obtain atomic-level active site catalysts;

[0043] 2) Preparation of ele...

Embodiment 1

[0060] Pt / TiO 2 Preparation of Atomic Scale Active Site Composite Nanocatalytic Fibers

[0061] 1) Preparation of Pt / TiO 2 Atomic level active site catalysts:

[0062] TiO will be used as catalyst support 2 The powder was dispersed in distilled water, adding H 2 PtCl 6 Solution, mixed to form the first dispersion; then, ultrasonic 20min, adjust the pH to 6 with sodium carbonate solution, stir and heat at 50°C for 6h, until all the water is evaporated to dryness, at this time the Pt atoms in the obtained precipitate are evenly loaded on the TiO 2 on the carrier; the obtained precipitate is washed with distilled water and absolute ethanol in sequence, dried in an oven, and finally calcined in a horse boiling furnace to obtain an atomic-level active site catalyst.

[0063] In the step 1), in the first dispersion liquid, TiO 2 The mass concentration is 0.04kg·L -1 , Pt and TiO 2 The mass ratio is 1:200;

[0064] The precipitate in step 1) was washed three times with disti...

Embodiment 2

[0076] Pd / CeO 2 Preparation of Atomic Scale Active Site Composite Nanocatalytic Fibers

[0077] 1) Preparation of Pd / CeO 2 Atomic level active site catalysts:

[0078] CeO to be used as catalyst support 2 The powder was dispersed in distilled water and PdSO was added 4 solution, mixed to form the first dispersion; then, ultrasonicated for 50 min, adjusted to pH 9 with sodium carbonate solution, stirred and heated at 100°C for 2 h, until all the water was evaporated to dryness, at this time the Pd atoms in the obtained precipitate were evenly loaded on the CeO 2 on the carrier; the resulting precipitate is washed with distilled water and absolute ethanol in sequence, dried in an oven, and finally calcined in a horse boiling furnace to obtain an atomic-level active site catalyst.

[0079] In the step 1), in the first dispersion liquid, CeO 2 The mass concentration is 0.4kg·L -1 , Pd and CeO 2 The mass ratio is 1:20;

[0080] The precipitate in step 1) was washed 4 times ...

technical field

[0001] The invention belongs to the technical field of catalysts and the field of VOCs pollution control, and relates to a preparation method and application of a composite nano-catalytic fiber with atomic-level active sites, in particular to a preparation method of a precious metal-based atomic-level active site composite nano-catalytic fiber And its application in catalytic degradation of indoor VOCs at room temperature. Background technique

[0002] With the development of the economy and the improvement of people's living standards, people's requirements for interior decoration have also increased. A large number of building materials and coatings that can generate volatile organic compounds (VOCs) have also entered the room with interior decoration, causing indoor air pollution. decline in quality. According to the definition of GB 50325-2010 "Code for Indoor Environmental Pollution Control of Civil Construction Engineering", indoor air VOCs include ben...

Examples

preparation example Construction

[0040] As shown in the accompanying drawings, a method for preparing an atomic-level active site composite nano-catalytic fiber for degrading indoor VOCs of the present invention comprises the following steps:

[0041] 1) Preparation of noble metal-based atomic-level active site catalysts:

[0042] Disperse the rare earth metal oxide powder used as a catalyst carrier in distilled water, add a salt or acid solution containing the active component of the noble metal, and mix to form the first dispersion; then, ultrasonically adjust the pH with sodium carbonate solution, stir and heat until All the water is evaporated to dryness, and the active atoms of the noble metal in the obtained precipitate are evenly loaded on the rare earth metal oxide carrier; the obtained precipitate is washed with distilled water and absolute ethanol in sequence, dried in an oven, and finally calcined in a horse boiling furnace. Obtain atomic-level active site catalysts;

[0043] 2) Preparation of ele...

Embodiment 1

[0060] Pt / TiO 2 Preparation of Atomic Scale Active Site Composite Nanocatalytic Fibers

[0061] 1) Preparation of Pt / TiO 2 Atomic level active site catalysts:

[0062] TiO will be used as catalyst support 2 The powder was dispersed in distilled water, adding H 2 PtCl 6 Solution, mixed to form the first dispersion; then, ultrasonic 20min, adjust the pH to 6 with sodium carbonate solution, stir and heat at 50°C for 6h, until all the water is evaporated to dryness, at this time the Pt atoms in the obtained precipitate are evenly loaded on the TiO 2 on the carrier; the obtained precipitate is washed with distilled water and absolute ethanol in sequence, dried in an oven, and finally calcined in a horse boiling furnace to obtain an atomic-level active site catalyst.

[0063] In the step 1), in the first dispersion liquid, TiO 2 The mass concentration is 0.04kg·L -1 , Pt and TiO 2 The mass ratio is 1:200;

[0064] The precipitate in step 1) was washed three times with disti...

Embodiment 2

[0076] Pd / CeO 2 Preparation of Atomic Scale Active Site Composite Nanocatalytic Fibers

[0077] 1) Preparation of Pd / CeO 2 Atomic level active site catalysts:

[0078] CeO to be used as catalyst support 2 The powder was dispersed in distilled water and PdSO was added 4 solution, mixed to form the first dispersion; then, ultrasonicated for 50 min, adjusted to pH 9 with sodium carbonate solution, stirred and heated at 100°C for 2 h, until all the water was evaporated to dryness, at this time the Pd atoms in the obtained precipitate were evenly loaded on the CeO 2 on the carrier; the resulting precipitate is washed with distilled water and absolute ethanol in sequence, dried in an oven, and finally calcined in a horse boiling furnace to obtain an atomic-level active site catalyst.

[0079] In the step 1), in the first dispersion liquid, CeO 2 The mass concentration is 0.4kg·L -1 , Pd and CeO 2 The mass ratio is 1:20;

[0080] The precipitate in step 1) was washed 4 times ...

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