Preparation method of photocatalyst nano-aldehyde-removing carbon package with formaldehyde removal function
By preparing photocatalytic nano-formaldehyde removal charcoal packs, combining physical adsorption and photocatalysis, the problem of existing charcoal packs being unable to completely degrade formaldehyde has been solved, achieving a highly efficient and safe formaldehyde removal effect.
Patent Information
- Application Number
- CN202512036499.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-31
- Publication Date
- 2026-11-06
AI Technical Summary
Existing formaldehyde removal products such as charcoal bags mainly rely on physical adsorption and cannot completely degrade formaldehyde, thus failing to effectively reduce the harm caused by formaldehyde.
The raw materials, including titanium dioxide, sepiolite, diatomaceous earth, bentonite, attapulgite, activated carbon, and manganese oxide, are pulverized to the nanoscale using a ball mill. After mixing, they are pressed into sheets, dried at low temperature, activated at high temperature, and treated with steam to form porous nano-formaldehyde-removing carbon particles. Nano-titanium dioxide colloid is then added to form a photocatalyst, and the product is packaged in a non-woven fabric bag.
The photocatalytic nano-carbon packs achieve efficient formaldehyde degradation through the synergistic effect of physical adsorption and photocatalysis. The uniformity of raw material mixing and the optimization of pore structure enhance adsorption capacity, and the product is safe, environmentally friendly, and has no toxic side effects.
Abstract
Description
Technical Field
[0001] This invention relates to a method for preparing a photocatalytic nano-formaldehyde-removing charcoal pack with formaldehyde removal function. The charcoal pack prepared by this method has an extremely high formaldehyde removal effect and is widely applicable to various scenarios, such as homes, offices, hospitals, schools, hotels, etc. The product can remove formaldehyde, benzene, TVOC and other harmful gases. Technical Background
[0002] Formaldehyde is a colorless gas with a strong, pungent odor, slightly heavier than air. Formaldehyde readily polymerizes into paraformaldehyde, which readily depolymerizes upon heating, slowly releasing monomeric formaldehyde when the temperature reaches 19 degrees Celsius. The release period of formaldehyde from indoor renovations can be as long as 15 years; if not treated promptly, it can cause continuous and long-term harm to humans. Formaldehyde is not only present in newly renovated rooms or newly purchased furniture; as an inexpensive basic chemical raw material, formaldehyde has a very deep and widespread presence in our daily lives. It comes into contact with cars, food, clothing, stationery, children's toys, and many other aspects of our lives, including our living environment, housing, and entertainment.
[0003] Formaldehyde poses numerous health risks, the most common being irritation from skin and mucous membrane contact. For example, contact with airborne formaldehyde can damage the conjunctiva, potentially leading to corneal and conjunctival ulcers. Skin and mucous membrane irritation, especially after contact, can cause itching, dryness, and even ulceration. It also irritates the nasal and pharyngeal mucosa, causing local dryness, pain, and ulcers. Furthermore, it can damage the trachea, bronchi, and lung tissues, causing congestion, edema, and ulceration, with symptoms including cough, phlegm, chest tightness, wheezing, and difficulty breathing; in severe cases, respiratory failure may occur. Additionally, it can affect liver and kidney function, potentially leading to liver and kidney failure. Therefore, it is crucial to address formaldehyde issues proactively. Currently reported formaldehyde removal products using activated carbon bags primarily rely on physical adsorption and cannot completely degrade formaldehyde and other harmful substances. Therefore, there is an urgent need to develop activated carbon bag products that can degrade formaldehyde to reduce its harmful effects. Summary of the Invention
[0004] In view of the above-mentioned technical problems, the present invention provides a method for preparing a photocatalytic nano-formaldehyde-removing charcoal bag with formaldehyde removal function, so as to reduce the harm of formaldehyde by producing a formaldehyde-removing charcoal bag product that can degrade formaldehyde.
[0005] To achieve the above objectives, this invention provides a method for preparing a photocatalytic nano-formaldehyde-removing activated carbon pack with formaldehyde removal function, comprising: (1) Prepare raw materials: titanium dioxide, sepiolite, diatomaceous earth, bentonite, attapulgite, activated carbon, and manganese dioxide. Use a ball mill to pulverize each raw material to the nanoscale and set aside. (2) Mix the raw materials with the adhesive in proportion and press the mixture into tablets using a tablet press. (3) Place the pressed sheet-like solid in a low-temperature drying oven to dry; (4) The dried tablets are placed in a high-temperature furnace and activated by steam to obtain porous nano-carbon particles for aldehyde removal. (5) Add nano-titanium dioxide to deionized water to form titanium dioxide colloid, add organic acid, add hydrogen peroxide solution, mix and stir to form peroxytitanic acid aqueous solution; (6) The porous nano-carbon particles for removing aldehydes were immersed in a peroxytitanic acid solution. After the particles were removed, they were microwave-heated to obtain nano-carbon particles for removing aldehydes with nano-titanium dioxide photocatalysts grown on the surface in situ. (7) A certain amount of in-situ grown nano titanium dioxide photocatalyst nano-formaldehyde removal carbon particles are packaged in a non-woven fabric packaging bag using a packaging machine to obtain a photocatalyst nano-formaldehyde removal carbon bag with formaldehyde removal function.
[0006] As one aspect of the present invention, the ratio of the photocatalyst, sepiolite, diatomaceous earth, bentonite, attapulgite, activated carbon, and manganese oxide is 1:50-60:8-10:10-12:10-15:10-15:1-3.
[0007] As one aspect of the present invention, each of the raw materials needs to be pulverized to below 100 nm.
[0008] As one aspect of the invention, the adhesive is a mixture of polyethylene glycol 8000 and β-cyclodextrin in a 5:1 ratio.
[0009] As one aspect of the present invention, the temperature for low-temperature drying of the sheet-like solid is 100-200°C, and the drying time is 12-24 hours.
[0010] As one aspect of the present invention, the dried tablets are calcined and activated in a high-temperature furnace at a temperature of 600-700°C for 1-2 hours, and the proportion of water vapor introduced into the air is 20%-40%.
[0011] As one aspect of the present invention, the nano-titanium dioxide has a particle size of 3-5 nm, preferably JWN-TO-A01 from Ningbo Jiwei Nano New Materials Technology Co., Ltd.
[0012] As one aspect of the present invention, the organic acid is one of acetic acid, citric acid, and malic acid.
[0013] As one aspect of the present invention, the temperature of the microwave heating is 140 degrees Celsius to 160 degrees Celsius; and the heat treatment time is 6 hours to 12 hours.
[0014] This application provides a method for preparing a photocatalytic nano-carbon pack with formaldehyde removal function, which has the following advantages: (1) The photocatalytic nano-carbon pack can efficiently adsorb and degrade formaldehyde through the synergistic effect of physical adsorption and photocatalysis; (2) The raw materials are crushed to more than 10,000 mesh, which can make the raw materials more uniform and the tablet performance stable; (3) The tablets can be made more porous and porous by water vapor activation, increasing the specific surface area of the material and strengthening the ability to adsorb formaldehyde; (4) The raw materials are widely available, have large output, low price, and are safe, environmentally friendly and non-toxic. Specific Implementation
[0015] Example 1
[0016] (1) Take 10g of titanium dioxide, 550g of sepiolite, 100g of diatomaceous earth, 100g of bentonite, 120g of attapulgite, 120g of activated carbon, and 20g of manganese oxide, and grind each raw material to 100nm using a ball mill. (2) Mix all the raw materials together and mix thoroughly with 2g of adhesive. Press the mixture into tablets using a tablet press. (3) Place the pressed sheet-like solid in a low-temperature drying oven to dry at a temperature of 150°C for 14 hours; (4) The dried tablets were placed in a high-temperature furnace for calcination and activation. Air containing 30% water vapor was introduced, the calcination temperature was 650℃, and the calcination time was 1.5h to obtain porous nano-formaldehyde removal carbon particles. (5) Take 1g of nano titanium dioxide and add it to 100ml of water. Add 1mol / L acetic acid slowly with stirring until the pH of the solution is 3. Add 50ml of 30% hydrogen peroxide and stir at room temperature for 1 hour to obtain a light yellow transparent peroxytitanic acid aqueous solution. (6) Take 200g of nano-formaldehyde removal carbon particles and add them to the above light yellow transparent peroxytitanic acid aqueous solution to make the particles and solution come into uniform and full contact; then take out the particles and place them in an oven to dry. (7) The above particles were placed in a reaction vessel and sealed. The mixture was microwave heated at 150°C for 6 hours to obtain nano-formaldehyde removal carbon particles with nano-titanium dioxide photocatalyst grown on the surface. (8) Use a packaging machine to pack 50g of in-situ grown nano titanium dioxide photocatalyst nano formaldehyde removal carbon particles into a non-woven fabric packaging bag to obtain a photocatalyst nano formaldehyde removal carbon bag with formaldehyde removal function.
[0017] Example 2
[0018] (1) Take 10g of photocatalyst, 500g of sepiolite, 100g of diatomaceous earth, 120g of bentonite, 100g of attapulgite, 120g of activated carbon and 25g of manganese oxide, and grind each raw material to 10,000 mesh using a ball mill. (2) Mix all the raw materials together and mix thoroughly with 1.5g of adhesive. Press the mixture into tablets using a tablet press. (3) Place the pressed sheet-like solid in a low-temperature drying oven to dry at a temperature of 140°C for 16 hours; (4) The dried tablets were placed in a high-temperature furnace for calcination and activation. Air containing 35% water vapor was introduced, the calcination temperature was 660℃, and the calcination time was 2h to obtain porous photocatalytic nano-carbon particles for removing aldehydes. (5) Take 1g of nano titanium dioxide and add it to 100ml of water. Add 1mol / L citric acid slowly while stirring until the pH of the solution is 3. Add 50ml of 30% hydrogen peroxide and stir at room temperature for 1 hour to obtain a light yellow transparent peroxytitanic acid aqueous solution. (6) Take 200g of nano-formaldehyde removal carbon particles and add them to the above light yellow transparent peroxytitanic acid aqueous solution to make the particles and solution come into uniform and full contact; then take out the particles and place them in an oven to dry. (7) The above particles were placed in a reaction vessel and sealed. The vessel was then microwave-heated at 160°C for 6.5 h to obtain nano-formaldehyde removal carbon particles with nano-titanium dioxide photocatalyst grown on the surface. (8) Use a packaging machine to pack 50g of in-situ grown nano titanium dioxide photocatalyst nano formaldehyde removal carbon particles into a non-woven fabric packaging bag to obtain a photocatalyst nano formaldehyde removal carbon bag with formaldehyde removal function.
[0019] Example 3
[0020] (1) Take 10g of photocatalyst, 560g of sepiolite, 110g of diatomaceous earth, 120g of bentonite, 150g of attapulgite, 120g of activated carbon, and 15g of manganese oxide, and grind each raw material to 10,000 mesh using a ball mill. (2) Mix all the raw materials together and mix thoroughly with 2g of adhesive. Press the mixture into tablets using a tablet press. (3) Place the pressed sheet-like solid in a low-temperature drying oven to dry at a temperature of 140°C for 24 hours; (4) The dried tablets were placed in a high-temperature furnace for calcination and activation. Air containing 25% water vapor was introduced, the calcination temperature was 700℃, and the calcination time was 2h to obtain porous photocatalytic nano-carbon particles for removing formaldehyde. (5) Take 1g of nano titanium dioxide and add it to 100ml of water. Add 1mol / L malic acid slowly under stirring until the pH of the solution is 3. Add 50ml of 30% hydrogen peroxide and stir at room temperature for 1 hour to obtain a light yellow transparent peroxytitanic acid aqueous solution. (6) Take 200g of nano-formaldehyde removal carbon particles and add them to the above light yellow transparent peroxytitanic acid aqueous solution to make the particles and solution come into uniform and full contact; then take out the particles and place them in an oven to dry. (7) The above particles were placed in a reaction vessel and sealed. The mixture was microwave heated at 170°C for 7 hours to obtain nano-formaldehyde removal carbon particles with nano-titanium dioxide photocatalyst grown on the surface. (8) Use a packaging machine to pack 50g of in-situ grown nano titanium dioxide photocatalyst nano formaldehyde removal carbon particles into a non-woven fabric packaging bag to obtain a photocatalyst nano formaldehyde removal carbon bag with formaldehyde removal function.
[0021] Comparative Example 1 (1) Take 10g photocatalyst, 550g sepiolite, 100g diatomaceous earth, 100g bentonite, 120g attapulgite, 120g activated carbon, and 20g manganese oxide; (2) Mix all the raw materials together and mix thoroughly with 2g of adhesive. Press the mixture into tablets using a tablet press. (3) Place the pressed sheet-like solid in a low-temperature drying oven to dry at a temperature of 150°C for 14 hours; (4) The dried tablets were placed in a high-temperature furnace for calcination and activation. Air containing 30% water vapor was introduced, the calcination temperature was 650℃, and the calcination time was 1.5h to obtain porous photocatalytic nano-carbon particles for removing formaldehyde. (5) Take 1g of nano titanium dioxide and add it to 100ml of water. Add 1mol / L acetic acid slowly with stirring until the pH of the solution is 3. Add 50ml of 30% hydrogen peroxide and stir at room temperature for 1 hour to obtain a light yellow transparent peroxytitanic acid aqueous solution. (6) Take 200g of nano-formaldehyde removal carbon particles and add them to the above light yellow transparent peroxytitanic acid aqueous solution to make the particles and solution come into uniform and full contact; then take out the particles and place them in an oven to dry. (7) The above particles were placed in a reaction vessel and sealed. The mixture was microwave heated at 150°C for 6 hours to obtain nano-formaldehyde removal carbon particles with nano-titanium dioxide photocatalyst grown on the surface. (8) Use a packaging machine to pack 50g of in-situ grown nano titanium dioxide photocatalyst nano formaldehyde removal carbon particles into a non-woven fabric packaging bag to obtain a photocatalyst nano formaldehyde removal carbon bag with formaldehyde removal function.
[0022] The only difference between this comparative example and Example 1 is that the raw materials were not pulverized to 10,000 mesh.
[0023] Comparative Example 2 (1) Take 10g of photocatalyst, 550g of sepiolite, 100g of diatomaceous earth, 100g of bentonite, 120g of attapulgite, 120g of activated carbon, and 20g of manganese oxide, and grind each raw material to 10,000 mesh using a ball mill. (2) Mix all the raw materials and press the mixture into tablets using a tablet press; (3) Place the pressed sheet-like solid in a low-temperature drying oven to dry at a temperature of 150°C for 14 hours; (4) The dried tablets were placed in a high-temperature furnace for calcination and activation. Air containing 30% water vapor was introduced, the calcination temperature was 650℃, and the calcination time was 1.5h to obtain porous photocatalytic nano-carbon particles for removing formaldehyde. (5) Take 1g of nano titanium dioxide and add it to 100ml of water. Add 1mol / L acetic acid slowly with stirring until the pH of the solution is 3. Add 50ml of 30% hydrogen peroxide and stir at room temperature for 1 hour to obtain a light yellow transparent peroxytitanic acid aqueous solution. (6) Take 200g of nano-formaldehyde removal carbon particles and add them to the above light yellow transparent peroxytitanic acid aqueous solution to make the particles and solution come into uniform and full contact; then take out the particles and place them in an oven to dry. (7) The above particles were placed in a reaction vessel and sealed. The mixture was microwave heated at 150°C for 6 hours to obtain nano-formaldehyde removal carbon particles with nano-titanium dioxide photocatalyst grown on the surface. (8) Use a packaging machine to pack 50g of in-situ grown nano titanium dioxide photocatalyst nano formaldehyde removal carbon particles into a non-woven fabric packaging bag to obtain a photocatalyst nano formaldehyde removal carbon bag with formaldehyde removal function.
[0024] The only difference between this comparative example and Example 1 is that no adhesive was added when the raw materials were mixed.
[0025] Comparative Example 3 (1) Take 10g of photocatalyst, 550g of sepiolite, 100g of diatomaceous earth, 100g of bentonite, 120g of attapulgite, 120g of activated carbon, and 20g of manganese oxide, and grind each raw material to 10,000 mesh using a ball mill. (2) Mix all the raw materials together and mix thoroughly with 2g of adhesive. Press the mixture into tablets using a tablet press. (3) Place the pressed sheet-like solid in a low-temperature drying oven to dry at a temperature of 150°C for 14 hours; (4) The dried tablets were placed in a high-temperature furnace for calcination and activation. The calcination temperature was 650℃ and the calcination time was 1.5h to obtain photocatalytic nano-formaldehyde removal carbon particles. (5) Take 1g of nano titanium dioxide and add it to 100ml of water. Add 1mol / L acetic acid slowly with stirring until the pH of the solution is 3. Add 50ml of 30% hydrogen peroxide and stir at room temperature for 1 hour to obtain a light yellow transparent peroxytitanic acid aqueous solution. (6) Take 200g of nano-formaldehyde removal carbon particles and add them to the above light yellow transparent peroxytitanic acid aqueous solution to make the particles and solution come into uniform and full contact; then take out the particles and place them in an oven to dry. (7) The above particles were placed in a reaction vessel and sealed. The mixture was microwave heated at 150°C for 6 hours to obtain nano-formaldehyde removal carbon particles with nano-titanium dioxide photocatalyst grown on the surface. (8) Use a packaging machine to pack 50g of in-situ grown nano titanium dioxide photocatalyst nano formaldehyde removal carbon particles into a non-woven fabric packaging bag to obtain a photocatalyst nano formaldehyde removal carbon bag with formaldehyde removal function.
[0026] The only difference between this comparative example and Example 1 is that no water vapor was introduced during the high-temperature activation and calcination.
[0027] Experimental Example In 1m 3 In the experimental chamber, formaldehyde solution was added dropwise to make the formaldehyde concentration 2.5 mg / m³. 3 The formaldehyde-removing granular activated carbon packets obtained in Examples 1-3 and Comparative Examples 1-3, each weighing 50g, were placed in the experimental chamber, and ultraviolet light was turned on. After 24 hours of use, the formaldehyde concentration in the experimental chamber was retested under the same conditions, as shown in Table 1 below. Formaldehyde removal rate = (initial formaldehyde concentration - 24-hour formaldehyde concentration) / initial formaldehyde concentration × 100%.
[0028] The photocatalytic nano-formaldehyde removal carbon packs prepared by the methods in Examples 1-3 of this invention exhibit good formaldehyde removal rates, all approaching 100%. This is attributed to the synergistic effect of physical adsorption and photocatalytic degradation of each component, which effectively catalyzes the continuous decomposition of harmful gases such as formaldehyde. A comparison between Example 1 and Comparative Example 1 demonstrates that raw material crushing improves the formaldehyde removal effect of the material, as it enhances the uniformity of the particle components and optimizes the pore structure of the material. A comparison between Example 1 and Comparative Example 2 demonstrates that adding an adhesive improves the stability of the particles, thereby affecting the formaldehyde removal performance of the material. A comparison between Example 1 and Comparative Example 3 demonstrates that introducing water vapor during activation improves the adsorption performance of the particles, thus enhancing the formaldehyde removal performance of the material.
Claims
1. A method for preparing a photocatalyst nano-aldehyde-removing carbon package with formaldehyde removal function, characterized in that, include: (1) Prepare raw materials: titanium dioxide, sepiolite, diatomaceous earth, bentonite, attapulgite, activated carbon, and manganese dioxide. Use a ball mill to pulverize each raw material to the nanoscale and set aside. (2) Mix the raw materials with the adhesive in proportion and press the mixture into tablets using a tablet press. (3) Place the pressed sheet-like solid in a low-temperature drying oven to dry; (4) The dried tablets are placed in a high-temperature furnace and activated by steam to obtain porous nano-carbon particles for aldehyde removal. (5) Add nano-titanium dioxide to deionized water to form titanium dioxide colloid, add organic acid, add hydrogen peroxide solution, mix and stir to form peroxytitanic acid aqueous solution; (6) The porous nano-carbon particles for removing aldehydes were immersed in a peroxytitanic acid solution. After the particles were removed, they were microwave-heated to obtain nano-carbon particles for removing aldehydes with nano-titanium dioxide photocatalysts grown on the surface in situ. (7) A certain amount of in-situ grown nano titanium dioxide photocatalyst nano-formaldehyde removal carbon particles are packaged in a non-woven fabric packaging bag using a packaging machine to obtain a photocatalyst nano-formaldehyde removal carbon bag with formaldehyde removal function.
2. The preparation method of a photocatalytic nano-formaldehyde removal carbon pack with formaldehyde removal function as described in claim 1, characterized in that: The ratio of photocatalyst, sepiolite, diatomaceous earth, bentonite, attapulgite, activated carbon, and manganese oxide is 1:50-60:8-10:10-12:10-15:10-15:1-3.
3. The preparation method of a photocatalytic nano-formaldehyde removal carbon pack with formaldehyde removal function as described in claim 1, characterized in that: Each of the raw materials needs to be pulverized to below 100nm.
4. The preparation method of a photocatalytic nano-formaldehyde removal carbon pack with formaldehyde removal function as described in claim 1, characterized in that: The adhesive is a mixture of polyethylene glycol 8000 and β-cyclodextrin in a 5:1 ratio.
5. The preparation method of a photocatalytic nano-formaldehyde removal carbon pack with formaldehyde removal function as described in claim 1, characterized in that: The temperature for low-temperature drying of the sheet-like solid is 100-200℃, and the drying time is 12-24h.
6. The preparation method of a photocatalytic nano-formaldehyde removal carbon pack with formaldehyde removal function as described in claim 1, characterized in that: The dried tablets are activated by calcination in a high-temperature furnace at a temperature of 600-700℃ for 1-2 hours, and the proportion of water vapor introduced into the air is 20%-40%.
7. The preparation method of a photocatalytic nano-formaldehyde removal carbon pack with formaldehyde removal function as described in claim 1, characterized in that: The nano-titanium dioxide has a particle size of 3-5 nm, preferably JWN-TO-A01 from Ningbo Jiwei Nano New Materials Technology Co., Ltd.
8. The preparation method of a photocatalytic nano-formaldehyde removal carbon pack with formaldehyde removal function as described in claim 1, characterized in that: The organic acid is one of acetic acid, citric acid, and malic acid.
9. The preparation method of a photocatalytic nano-formaldehyde removal carbon pack with formaldehyde removal function as described in claim 1, characterized in that: The microwave heating temperature is 140 degrees Celsius to 160 degrees Celsius; the heat treatment time is 6 hours to 12 hours.