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Graded porous metal hydroxide-sio2 composite formaldehyde adsorbent and preparation method thereof

A formaldehyde adsorption, hydroxide technology, applied in the field of nanomaterials and indoor air purification

Active Publication Date: 2014-10-01
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, currently graded porous Ni(OH) 2 -SiO 2 The synthesis of composite materials and their use as adsorbents for the removal of formaldehyde gas are rarely reported.

Method used

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  • Graded porous metal hydroxide-sio2 composite formaldehyde adsorbent and preparation method thereof
  • Graded porous metal hydroxide-sio2 composite formaldehyde adsorbent and preparation method thereof
  • Graded porous metal hydroxide-sio2 composite formaldehyde adsorbent and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0026] The preparation of embodiment 1 formaldehyde adsorbent

[0027] (1) Disperse PEG400 in cyclohexane under the action of stirring, and stir at 50°C to make it fully dispersed;

[0028] (2) Add nickel nitrate aqueous solution and ammonia water (27wt%) in sequence in step (1), wherein the molar ratio of nickel and ammonia water added is 1:3, and continue to stir for 3 hours;

[0029] (3) Add ethyl orthosilicate to the mixed emulsion in step (2), wherein the molar ratio of silicon and ammonia water added is 1:3, and continue to stir for 4 hours;

[0030] (4) The nickel hydroxide obtained in step (3) and SiO 2 The composites were centrifuged, then vacuum-dried at 65 °C for 12 h, cooled and ground to obtain hierarchical porous nickel hydroxide and SiO 2 Composite formaldehyde adsorbent.

[0031] XRD, SEM, TEM, isotherm adsorption line and pore size distribution figure of the product prepared in embodiment 1 are respectively as follows figure 1 , figure 2 , image 3 and ...

Embodiment 2

[0033] Preparation of formaldehyde adsorbent

[0034] (1) Disperse PEG400 in cyclohexane under the action of stirring, and stir at 50°C to make it fully dispersed;

[0035] (2) Add Ni(NO 3 ) 2 Aqueous solution and ammoniacal liquor (27wt%), wherein the molar ratio of nickel and ammoniacal liquor added is 1:3, continue stirring for 3 hours;

[0036] (3) Add ethyl orthosilicate to the mixed emulsion in step (2), wherein the molar ratio of silicon and ammonia water added is 1:3, and continue to stir for 2 hours;

[0037] (4) The nickel hydroxide obtained in step (3) and SiO 2 The composites were centrifuged, then vacuum-dried at 65 °C for 12 h, cooled and ground to obtain hierarchical porous nickel hydroxide and SiO 2 Composite formaldehyde adsorbent. The specific surface area of ​​the composite adsorbent is 274m 2 / g. The mass content of nickel hydroxide is 61wt%.

Embodiment 3

[0038] Embodiment 3 preparation of formaldehyde adsorbent

[0039] (1) Disperse PEG400 in cyclohexane under the action of stirring, and stir at 50°C to make it fully dispersed;

[0040] (2) Add Ni(NO 3 ) 2 Aqueous solution and ammoniacal liquor (27wt%), wherein the molar ratio of nickel and ammoniacal liquor added is 1:3, continue stirring for 3 hours;

[0041] (3) Add ethyl orthosilicate to the mixed emulsion in step (2), wherein the molar ratio of silicon and ammonia water added is 1:3, and continue to stir for 6 hours;

[0042] (4) The nickel hydroxide obtained in step (3) and SiO 2 The composites were centrifuged, then vacuum-dried at 65 °C for 12 h, cooled and ground to obtain hierarchical porous nickel hydroxide and SiO 2 Composite formaldehyde adsorbent. The specific surface area of ​​the composite adsorbent is 133m 2 / g. The mass content of nickel hydroxide is 37wt%.

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Abstract

Provided are a graded porous metal hydroxide-SiO2 compound formaldehyde adsorbent and a preparing method thereof. The preparing method is characterized in that water-soluble metal salts, soluble alkaline substances and silicon-containing precursors serve as raw materials and are continuously stirred in oil pocket water type emulsion, and after hydrolyzation-codeposition and drying, the product is obtained. The oil pocket water type emulsion is adopted, and the highly dispersed graded porous metal hydroxide-SiO2 compound formaldehyde adsorbent can be obtained through synthesizing at temperature of 20-70 DEG C. The mass content of metal hydroxide is 90-20wt%, and is 80-40wt% preferentially. At room temperature, the prepared metal hydroxide-SiO2 compound formaldehyde adsorbent has very large adsorption capacity and fast adsorption rate for formaldehyde in the air, and activity of the metal hydroxide-SiO2 compound formaldehyde adsorbent basically keeps unchanged in multiple regeneration use. The preparing method is simple and easy to operate, and the prepared metal hydroxide-SiO2 compound formaldehyde adsorbent is fast in formaldehyde adsorption rate and large in formaldehyde adsorption capacity at room temperature.

Description

technical field [0001] The invention relates to a graded porous formaldehyde adsorbent and a preparation method thereof, specifically a graded porous metal hydroxide-SiO 2 Composite formaldehyde adsorbent and preparation method thereof. The invention belongs to the field of nanometer material and indoor air purification. Background technique [0002] Formaldehyde is a typical indoor pollutant, which mainly comes from building materials and interior decoration materials. Due to the use of a large amount of urea-formaldehyde glue and phenol-formaldehyde glue in various wood-based panels used indoors, they will continue to decompose for a long time, thereby causing indoor air pollution. At lower concentrations, the impact of formaldehyde on human health is mainly manifested in irritating eyes and respiratory tract, causing chest tightness and skin itching, that is, sick house syndrome (sick house syndrome). When the concentration is greater than 15ppm, formaldehyde can cause...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/10B01J20/28B01J20/30B01D53/02
Inventor 余家国徐志花程蓓
Owner WUHAN UNIV OF TECH