Environment-friendly efficient photocatalyst formaldehyde scavenger

Abstract

The invention relates to the technical field of air purification, in particular to an environment-friendly efficient photocatalyst formaldehyde scavenger. The photocatalyst comprises the following raw materials in percentage by weight: 10-30% of a titanium dioxide photocatalyst, 5-20% of activated carbon, 5-15% of nano-scale silicon dioxide, 2-5% of nano-scale zinc oxide, 1-2% of an auxiliary agent and the balance of water. According to the environment-friendly efficient photocatalyst formaldehyde scavenger and the preparation method thereof, the scavenger decomposes formaldehyde into harmless carbon dioxide and water under the illumination condition by utilizing the photocatalysis effect of a photocatalyst, and therefore the purpose of effectively removing indoor formaldehyde for a long time is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of air purification, and in particular to an environmentally friendly and efficient photocatalyst formaldehyde scavenger. Background Art

[0002] Since formaldehyde is widely used in adhesives, coatings, panels and other materials in interior decoration and furniture, it has become one of the main components of indoor air pollution. Long-term exposure to formaldehyde-contaminated environments can have serious effects on human health, such as causing respiratory diseases, skin allergies, and even cancer.

[0003] Although there are many types of formaldehyde removal products on the market, they generally have problems such as low removal efficiency, short duration, and secondary pollution to the environment. Traditional physical adsorption methods, such as activated carbon adsorption, can temporarily reduce indoor formaldehyde concentrations, but they need to be replaced after adsorption saturation, and cannot completely decompose formaldehyde. Although chemical reaction methods can convert formaldehyde into harmless substances, they often require the addition of catalysts, and the reaction conditions are harsh, making them difficult to use in home environments. Summary of the invention

[0004] The invention provides an environmentally friendly and efficient photocatalyst formaldehyde scavenger and a preparation method thereof. The scavenger utilizes the photocatalytic effect of the photocatalyst to decompose formaldehyde into harmless carbon dioxide and water under light conditions, thereby achieving the purpose of effectively removing indoor formaldehyde for a long time.

[0005] The technical solution adopted by the present invention is: an environmentally friendly and efficient photocatalyst formaldehyde scavenger, wherein the raw materials thereof include the following components by weight percentage: 10-30% of titanium dioxide photocatalyst, 5%-20% of activated carbon, 5%-15% of nano-scale silicon dioxide, 2%-5% of nano-scale zinc oxide, 1%-2% of auxiliary agent, and the balance is water.

[0006] As a further improvement of the present invention, the titanium dioxide photocatalyst is anatase titanium dioxide.

[0007] As a further improvement of the present invention, the activated carbon is in granular or powdery form.

[0008] As a further improvement of the present invention, the particle size of the nano-scale silicon dioxide is 5-50 nanometers; the particle size of the nano-scale zinc oxide is 10-80 nanometers.

[0009] As a further improvement of the present invention, the auxiliary agent at least includes a preservative, a stabilizer, a dispersant, and a pH regulator.

[0010] As a further improvement of the present invention, the preservative is one or more of sodium benzoate and potassium sorbate; the stabilizer is one or more of polyethylene glycol, sodium polyacrylate, and calcium stearate; the dispersant is one or more of polyvinyl pyrrolidone and sodium dodecylbenzene sulfonate; and the pH adjuster is sodium hydroxide and citric acid.

[0011] The preparation method of an environmentally friendly and efficient photocatalyst formaldehyde scavenger comprises the following steps:

[0012] Step 1: uniformly mix titanium dioxide photocatalyst, activated carbon, nano-silicon dioxide, and nano-zinc oxide with water according to a certain proportion to obtain a mixed solution;

[0013] Step 2: Then add the auxiliary agent into the mixed solution, and mix and stir evenly with a stirrer to form a uniform photocatalyst formaldehyde scavenger solution;

[0014] Step 3: Filter the prepared photocatalyst formaldehyde scavenger solution to remove incompletely dissolved particles to obtain a finished scavenger product.

[0015] As a further improvement of the present invention, the rotation speed of the stirrer is controlled at 300-600 rpm.

[0016] As a further improvement of the present invention, the filtering step uses a microporous filtration membrane with a pore size of 0.22 microns.

[0017] The beneficial effects of the present invention are as follows: (1) Highly efficient formaldehyde removal: The environmentally friendly and highly efficient photocatalyst formaldehyde remover utilizes the photocatalytic effect of photocatalysts to quickly and effectively decompose indoor formaldehyde into harmless carbon dioxide and water under light conditions, significantly reducing indoor formaldehyde concentration and protecting the health of residents.

[0018] (2) Long-term effectiveness, no need for frequent replacement: Compared with the traditional physical adsorption method, the scavenger of the present invention does not need to worry about replacement after adsorption saturation. Its photocatalytic effect can continue under light conditions, ensuring long-term and effective formaldehyde removal effect.

[0019] (3) Environmentally friendly and without secondary pollution: The scavenger of the present invention adopts environmentally friendly materials, and no harmful chemicals are added during the preparation process. After use, it only produces harmless carbon dioxide and water under light, avoiding the secondary pollution problem that may be caused by traditional methods, and conforming to the concept of green living. DETAILED DESCRIPTION

[0020] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the embodiments. It should be understood that the embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0021] The invention provides an environmentally friendly and efficient photocatalyst formaldehyde scavenger. The raw materials thereof include the following components by weight percentage: 10-30% of titanium dioxide photocatalyst, 5%-20% of activated carbon, 5%-15% of nano-grade silicon dioxide, 2%-5% of nano-grade zinc oxide, 1%-2% of auxiliary agent, and the balance of water.

[0022] The titanium dioxide photocatalyst in the present invention is anatase titanium dioxide; the activated carbon is in granular or powdery form; the particle size of nano-scale silicon dioxide is 5-50 nanometers; and the particle size of nano-scale zinc oxide is 10-80 nanometers.

[0023] The auxiliary agent in the present invention at least includes a preservative, a stabilizer, a dispersant, and a pH adjuster. The preservative is one or more of sodium benzoate and potassium sorbate; the stabilizer is one or more of polyethylene glycol, sodium polyacrylate, and calcium stearate; the dispersant is one or more of polyvinyl pyrrolidone and sodium dodecylbenzene sulfonate; and the pH adjuster is sodium hydroxide and citric acid.

[0024] The preparation method of an environmentally friendly and efficient photocatalyst formaldehyde scavenger comprises the following steps:

[0025] Step 1: uniformly mix titanium dioxide photocatalyst, activated carbon, nano-silicon dioxide, and nano-zinc oxide with water according to a certain proportion to obtain a mixed solution;

[0026] Step 2: then add the auxiliary agent to the mixed solution, and use a stirrer to mix and stir evenly to form a uniform photocatalyst formaldehyde scavenger solution, wherein the speed of the stirrer is controlled at 300-600 rpm;

[0027] Step 3: Filter the prepared photocatalyst formaldehyde scavenger solution to remove incompletely dissolved particles to obtain a scavenger product, wherein the filtration step uses a microporous filter membrane with a pore size of 0.22 microns.

[0028] Embodiment 1:

[0029] This embodiment provides an environmentally friendly and efficient photocatalyst formaldehyde scavenger and a preparation method thereof, and the specific steps are as follows.

[0030] (I) First, prepare titanium dioxide photocatalyst, activated carbon, nano-silicon dioxide, nano-zinc oxide, and additives. According to weight percentage, titanium dioxide photocatalyst accounts for 20%, activated carbon accounts for 10%, nano-silicon dioxide accounts for 10%, nano-zinc oxide accounts for 3%, additives account for 1.5%, and the balance is water.

[0031] (ii) Mix the raw materials according to the above proportions, add an appropriate amount of water, stir evenly, and obtain a mixed solution.

[0032] (iii) Then, add the preservative sodium benzoate, the stabilizer polyethylene glycol, and the dispersant polyvinyl pyrrolidone into the mixed solution, and add sodium hydroxide and citric acid to adjust the pH value, and continue stirring until completely dissolved.

[0033] (iv) Finally, the mixture was mixed evenly using a stirrer at a rotation speed of 450 rpm, and then filtered through a microporous filter membrane with a pore size of 0.22 μm. The resulting scavenger product was a transparent liquid without obvious particulate matter.

[0034] (V) The finished product can be put into a spray bottle and used to remove indoor formaldehyde pollution.

[0035] Experimental verification has shown that the scavenger has a significant formaldehyde removal efficiency under light conditions, a long service life, no secondary pollution to the environment, and meets environmental protection requirements.

[0036] Embodiment 2:

[0037] This embodiment provides an environmentally friendly and efficient photocatalyst formaldehyde scavenger and a preparation method thereof, and the specific steps are as follows.

[0038] (I) First, prepare titanium dioxide photocatalyst, activated carbon, nano-silicon dioxide, nano-zinc oxide, and additives. According to weight percentage, titanium dioxide photocatalyst accounts for 25%, activated carbon accounts for 15%, nano-silicon dioxide accounts for 8%, nano-zinc oxide accounts for 4%, additives account for 1.8%, and the balance is water.

[0039] (ii) Mix the raw materials according to the above proportions, add an appropriate amount of water, stir evenly, and obtain a mixed solution.

[0040] (III) Then, potassium sorbate (preservative), sodium polyacrylate (stabilizer), and sodium dodecylbenzene sulfonate (dispersant) are added to the mixed solution, and sodium hydroxide and citric acid are added to adjust the pH value, and stirring is continued until the mixture is completely dissolved.

[0041] (iv) Then, the mixture was mixed evenly using a stirrer with a rotation speed of 550 rpm, and then filtered through a microporous filter membrane with a pore size of 0.22 μm. The resulting scavenger product was a light yellow transparent liquid without obvious particulate matter.

[0042] (V) The finished product can be put into a spray bottle and used to remove indoor formaldehyde pollution.

[0043] Experimental verification shows that the scavenger also has a highly efficient ability to remove formaldehyde under light conditions, has a long service life, and causes no secondary pollution to the environment, which further proves the practicality and environmental friendliness of the environmentally friendly and efficient photocatalyst formaldehyde scavenger of the present invention.

[0044] Embodiment 3:

[0045] This embodiment provides an environmentally friendly and efficient photocatalyst formaldehyde scavenger and a preparation method thereof, and the specific steps are as follows.

[0046] (I) First, prepare titanium dioxide photocatalyst, activated carbon, nano-silicon dioxide, nano-zinc oxide, and additives. According to weight percentage, titanium dioxide photocatalyst accounts for 22%, activated carbon accounts for 12%, nano-silicon dioxide accounts for 12%, nano-zinc oxide accounts for 2%, additives account for 1.7%, and the balance is water.

[0047] (ii) Mix the raw materials according to the above proportions, add an appropriate amount of water, stir evenly, and obtain a mixed solution.

[0048] (iii) Then, add the preservative sodium benzoate, the stabilizer calcium stearate, and the dispersant polyvinyl pyrrolidone into the mixed solution, and add sodium hydroxide and citric acid to adjust the pH value, and continue stirring until completely dissolved.

[0049] (iv) Then, the mixture was mixed evenly using a stirrer at a rotation speed of 500 rpm, and then filtered through a microporous filter membrane with a pore size of 0.22 μm. The resulting scavenger product was a milky white transparent liquid without obvious particulate matter.

[0050] (V) The finished product can be put into a spray bottle and used to remove indoor formaldehyde pollution.

[0051] Experimental verification shows that the scavenger has a significant formaldehyde removal efficiency under light conditions, a long service life, and no secondary pollution to the environment, which further proves the practicality and environmental friendliness of the environmentally friendly and efficient photocatalyst formaldehyde scavenger of the present invention.

[0052] Embodiment 4:

[0053] This embodiment provides an environmentally friendly and efficient photocatalyst formaldehyde scavenger and a preparation method thereof, and the specific steps are as follows.

[0054] (I) First, prepare titanium dioxide photocatalyst, activated carbon, nano-silicon dioxide, nano-zinc oxide, and additives. According to weight percentage, titanium dioxide photocatalyst accounts for 24%, activated carbon accounts for 14%, nano-silicon dioxide accounts for 11%, nano-zinc oxide accounts for 4%, additives account for 1.6%, and the balance is water.

[0055] (ii) Mix the raw materials according to the above proportions, add an appropriate amount of water, stir evenly, and obtain a mixed solution.

[0056] (III) Then, potassium sorbate as a preservative, polyethylene glycol as a stabilizer, and sodium dodecylbenzene sulfonate as a dispersant are added to the mixed solution, and sodium hydroxide and citric acid are added to adjust the pH value thereof, and stirring is continued until the mixture is completely dissolved.

[0057] (iv) Then, the mixture was mixed evenly using a stirrer at a rotation speed of 400 rpm, and then filtered through a microporous filter membrane with a pore size of 0.22 μm. The resulting scavenger product was a light yellow transparent liquid without obvious particulate matter.

[0058] (V) The finished product can be put into a spray bottle and used to remove indoor formaldehyde pollution.

[0059] Experimental verification shows that the scavenger has a significant formaldehyde removal efficiency under light conditions, a long service life, and no secondary pollution to the environment, which further proves the practicality and environmental friendliness of the environmentally friendly and efficient photocatalyst formaldehyde scavenger of the present invention.

[0060] Embodiment 5:

[0061] This embodiment provides an environmentally friendly and efficient photocatalyst formaldehyde scavenger and a preparation method thereof, and the specific steps are as follows.

[0062] (I) First, prepare titanium dioxide photocatalyst, activated carbon, nano-silicon dioxide, nano-zinc oxide, and additives. According to weight percentage, titanium dioxide photocatalyst accounts for 23%, activated carbon accounts for 13%, nano-silicon dioxide accounts for 10%, nano-zinc oxide accounts for 3%, additives account for 1.5%, and the balance is water.

[0063] (ii) Mix the raw materials according to the above proportions, add an appropriate amount of water, stir evenly, and obtain a mixed solution.

[0064] (iii) Then, add the preservative sodium benzoate, the stabilizer polyethylene glycol, and the dispersant polyvinyl pyrrolidone into the mixed solution, and add sodium hydroxide and citric acid to adjust the pH value, and continue stirring until completely dissolved.

[0065] (iv) Then, the mixture was mixed evenly using a stirrer at a rotation speed of 450 rpm, and then filtered through a microporous filter membrane with a pore size of 0.22 μm. The resulting scavenger product was a transparent liquid without obvious particulate matter.

[0066] (V) The finished product can be put into a spray bottle and used to remove indoor formaldehyde pollution.

[0067] Experimental verification shows that the scavenger has a significant formaldehyde removal efficiency under light conditions, a long service life, and no secondary pollution to the environment, which further proves the practicality and environmental friendliness of the environmentally friendly and efficient photocatalyst formaldehyde scavenger of the present invention.

[0068] Performance Testing

[0069] The scavengers obtained in Example 1, Example 2, Example 3, Example 4, and Example 5 were tested for performance, and the test results showed that the scavengers prepared in all examples performed well in formaldehyde removal efficiency. The specific test method is as follows:

[0070] (i) In sealed containers of the same volume, add equal amounts of formaldehyde solution and spray equal amounts of remover.

[0071] (2) Place the container under simulated indoor lighting conditions and use a formaldehyde detector to measure the formaldehyde concentration in the container at regular intervals.

[0072] (III) Record and compare the changes in formaldehyde concentration before and after the removal of the scavenger in each embodiment, and calculate the removal rate.

[0073] (IV) The test results show that the scavengers of all embodiments can effectively reduce the formaldehyde concentration under light conditions, and the removal rates are all over 80%, among which the removal rates of Embodiment 2 and Embodiment 4 even reach over 90%.

[0074] (V) In addition, after testing the containers of the scavenger after use, no new harmful substances were found, proving that the scavenger has no secondary pollution to the environment.

[0075] In summary, the environmentally friendly and efficient photocatalyst formaldehyde scavenger of the present invention not only has efficient formaldehyde scavenging ability, but is also safe to use, environmentally friendly, and has good market application prospects.

[0076] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features thereof may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. Environmentally friendly and efficient photocatalyst formaldehyde scavenger, characterized in that: The raw materials include the following components by weight percentage: 10-30% of titanium dioxide photocatalyst, 5%-20% of activated carbon, 5%-15% of nano-silicon dioxide, 2%-5% of nano-zinc oxide, 1%-2% of auxiliary agent, and the balance is water.

2. The environmentally friendly and efficient photocatalyst formaldehyde scavenger according to claim 1, characterized in that: The titanium dioxide photocatalyst is anatase titanium dioxide.

3. The environmentally friendly and efficient photocatalyst formaldehyde scavenger according to claim 1, characterized in that: The activated carbon is in granular or powdery form.

4. The environmentally friendly and efficient photocatalyst formaldehyde scavenger according to claim 1, characterized in that: The particle size of the nano-scale silicon dioxide is 5-50 nanometers; the particle size of the nano-scale zinc oxide is 10-80 nanometers.

5. The environmentally friendly and efficient photocatalyst formaldehyde scavenger according to claim 1, characterized in that: The auxiliary agent at least includes a preservative, a stabilizer, a dispersant, and a pH adjuster.

6. The environmentally friendly and efficient photocatalyst formaldehyde scavenger according to claim 5, characterized in that: The preservative is one or more of sodium benzoate and potassium sorbate; the stabilizer is one or more of polyethylene glycol, sodium polyacrylate, and calcium stearate; the dispersant is one or more of polyvinyl pyrrolidone and sodium dodecylbenzene sulfonate; and the pH adjuster is sodium hydroxide and citric acid.

7. A method for preparing an environmentally friendly and efficient photocatalyst formaldehyde scavenger, characterized in that: The following steps are involved: Step 1: uniformly mix titanium dioxide photocatalyst, activated carbon, nano-silicon dioxide, and nano-zinc oxide with water according to a certain proportion to obtain a mixed solution; Step 2: Then add the auxiliary agent into the mixed solution, and mix and stir evenly with a stirrer to form a uniform photocatalyst formaldehyde scavenger solution; Step 3: Filter the prepared photocatalyst formaldehyde scavenger solution to remove incompletely dissolved particles to obtain a finished scavenger product.

8. The method for preparing the environmentally friendly and efficient photocatalyst formaldehyde scavenger according to claim 7, characterized in that: The rotating speed of the mixer is controlled at 300-600 rpm.

9. The method for preparing the environmentally friendly and efficient photocatalyst formaldehyde scavenger according to claim 7, characterized in that: The filtration step uses a microporous filtration membrane with a pore size of 0.22 microns.