Glass fiber filter element for visible light photocatalysis and air purification and preparation method thereof

Patent metadata

Field	Value
Publication number	US-11944957-B2
Application number	US-202117529014-A
Country	US
Kind code	B2
Filing date	Nov 17, 2021
Priority date	Nov 17, 2020
Publication date	Apr 2, 2024
Grant date	Apr 2, 2024

Abstract

A glass fiber filter element for visible light photocatalysis and air purification and a method for preparing the same. The glass fiber filter element includes 4 to 7 wt % of nanoparticles including at least one selected from zinc oxide, graphene oxide, titanium oxide, and reduced graphene oxide, 2 to 7 wt % of silver nanowires, 3 to 12 wt % of an adhesive system, and 78 to 91 wt % of a glass fiber mat, based on the total weight of the glass fiber filter element. The glass fiber mat is made of at least two glass fibers with different diameters, and the diameters are in a range of 0.15 to 3.5 μm. The nanoparticles have a particle size from 1 to 200 nm, and the silver nanowires have a diameter of 15 to 50 nm.

First claim

What is claimed is:

1. A glass fiber filter element for visible light photocatalysis and air purification, comprising:
4 to 7 wt % of nanoparticles comprising at least one selected from zinc oxide, graphene oxide, titanium oxide, and reduced graphene oxide,
2 to 7 wt % of silver nanowires,
3 to 12 wt % of an adhesive system, and
78 to 91 wt % of a glass fiber mat,
based on a total weight of the glass fiber filter element,
wherein the glass fiber mat is made of at least two glass fibers with different diameters, and the diameters are in a range of 0.15 to 3.5 μm, the nanoparticles have a particle size from 1 to 200 nm, and the silver nanowires have a diameter of 15 to 50 nm, and
wherein the glass fiber mat has a three-dimensional network porous structure, and the glass fibers with different diameters are mutually interlaced.

2. The glass fiber filter element according to claim 1 , wherein the glass fiber mat comprises: 2.5 to 7.5 wt % of Al 2 O 3 , 4.5 to 8.5 wt % of MgO, 1.5 to 4.5 wt % of CaO, 3 to 6.5 wt % of B 2 O 3 , 4.5 to 7.5 wt % of a mixture of Fe 2 O, ZnO and BaO, 8 to 10.5 wt % of an alkali metal oxide R 2 O where R 2 O is selected from Na 2 O, K 2 O and a combination thereof, 56.5 to 66.5 wt % of SiO 2 , based on the total weight of the glass fiber mat.

3. The glass fiber filter element according to claim 1 , wherein the glass fiber mat is a matrix, and the nanoparticles and the silver nanowires are introduced by formation of a seed layer and in-situ growth.

4. The glass fiber filter element according to claim 1 , wherein the adhesive system comprises an adhesive and a modifier.

5. The glass fiber filter element according to claim 4 , wherein the adhesive is at least one selected from a pure acrylic emulsion, a silicone acrylic emulsion, a styrene acrylic emulsion, a vinegar acrylic emulsion and a modified phenolic resin, and
wherein an amount of the adhesive is in a range of 2 to 5 wt % of the total weight of the glass fiber filter element.

6. The glass fiber filter element according to claim 5 , wherein the modified phenolic resin is selected from a urea-modified phenolic resin, a polyurethane-modified phenolic resin and a melamine-modified phenolic resin.

7. The glass fiber filter element according to claim 4 , wherein the modifier is a silane coupling agent, and an amount of the modifier is in a range of 1 to 3 wt % of the total weight of the glass fiber filter element.

8. The glass fiber filter element according to claim 1 , wherein a zinc source for providing zinc oxide of the nanoparticles is at least one selected from zinc nitrate hexahydrate, zinc acetate, zinc sulfate, and zinc carbonate.

9. The glass fiber filter element according to claim 1 , wherein a titanium source for providing titanium oxide of the nanoparticles is at least one selected from tetrabutyl titanate, titanium tetrachloride, and titanium alkoxide.

10. The glass fiber filter element according to claim 1 , wherein the nanoparticles have a particle size from 1 to 10 nm.

11. A method for preparing the glass fiber filter element for visible light photocatalysis and air purification according to claim 1 , comprising:
(1) selecting two or more glass fiber mats with different glass fiber diameters, putting the glass fiber mats into a mixed liquid containing nanoparticles and silver nanowires, and using a fiber dissociator for stirring the mixed liquid to obtain a slurry;
(2) transporting the slurry to a paper machine for wet forming to obtain a wet paper with a seed layer of the nanoparticles, immersing the wet paper in an adhesive system, and drying the wet paper to obtain a glass fiber paper;
(3) immersing the glass fiber paper in a solution comprising the nanoparticles or precursors thereof, and drying the glass fiber paper;
(4) performing an annealing process on the glass fiber paper to obtain a filter paper; and
(5) folding the filter paper in a zigzag shape to obtain the glass fiber filter element.

12. The method according to claim 11 , wherein the glass fiber mat has glass fibers with a diameter of 0.15 to 3.5 μm.

13. The method according to claim 11 , wherein two glass fiber mats are used, and one of the glass fiber mats has a glass fiber diameter of 3.0 μm and the other one of the glass fiber mats has a glass fiber diameter of 1.0 μm.

14. The method according to claim 11 , wherein in step (1), the fiber dissociator has a revolving speed of 5000 to 12000 rpm, and the slurry has a concentration of 5 to 10 wt % and a pH value of 3.0 to 5.0.

15. The method according to claim 11 , wherein the drying in step (2) is baking on a drying plate at a temperature of 100 to 115° C. for 5±1 min.

16. The method according to claim 11 , wherein the solution in step (3) comprises a zinc oxide precursor solution, and the zinc oxide precursor solution is prepared by:
dissolving zinc acetate in deionized water, adding ammonia to obtain a precipitate, filtering the precipitate and drying the precipitate, and preparing the zinc oxide precursor solution having a molar concentration of 0.5 to 3.0 mol/L with the precipitate, ammonia and deionized water.

17. The method according to claim 11 , wherein the solution in step (3) comprises a graphene oxide solution, and the graphene oxide solution is prepared by:
dissolving glucose in deionized water to obtain an aqueous solution, heating the aqueous solution in a water bath at a temperature of 40 to 60° C. for 6 to 8 h, putting the aqueous solution in a Teflon reaction kettle, and placing the reaction kettle in a constant temperature blast drying oven at a temperature of 160 to 200° C. for 10 to 12 h, followed by standing for settlement and taking a supernatant as the graphene oxide solution.

18. The method according to claim 11 , wherein during the immersing in the step (2), the wet paper is lifted up at a lifting speed in a range of 0.5 to 5 cm/min.

19. The method according to claim 11 , wherein the annealing process in the step (4) is performed in an H 2 atmosphere at a temperature of 100° C. to 400° C. for 1 to 4 h.

Assignees

• Chongqing Institute Of East China Normal Univ
• Roi Optoelectronics Tech Co Ltd
• Univ East China Normal

Inventors

• Zeng Heping
• Hu Mengyun
• Feng Guang

Classifications

• B01J35/393

  Metal or metal oxide crystallite size · CPC title

• B01J2235/30

  Scanning electron microscopy; Transmission electron microscopy · CPC title

• B01J35/40

  characterised by dimensions, e.g. grain size (in a colloidal state B01J35/23; crystallite size B01J35/77) · CPC title

• B01J35/45

  Nanoparticles · CPC title

• B01J35/55

  Cylinders or rings · CPC title