High-efficiency photocatalyst formaldehyde scavenger and preparation method thereof

Abstract

The application belongs to the technical field of scavengers, and specifically discloses a high-efficiency photocatalyst formaldehyde scavenger and a preparation method thereof, the formaldehyde scavenger comprises the following raw materials: water, a photocatalyst, an additive, hydroxyethyl cellulose, PEG-40 hydrogenated castor oil, plant essential oil and isomeric tridecanol polyoxyethylene ether; the photocatalyst is double-loaded nano TiO2; and the additive is functional sepiolite. The photocatalyst formaldehyde scavenger prepared by the application has the characteristics of high-efficiency de-aldehyde and good durability, and has good bacteriostatic performance.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of scavengers, and particularly relates to a high-efficiency photocatalyst formaldehyde scavenger and a preparation method thereof. BACKGROUND

[0002] Formaldehyde is a common organic volatile compound that can be released from many household items such as furniture, decorative materials, building materials, and household appliances. Long-term exposure to high concentrations of formaldehyde can have negative effects on human health, such as irritating the respiratory tract, eyes, and skin, causing headaches, sore throat, coughing, and other discomfort symptoms. Formaldehyde scavengers are products used to reduce or eliminate indoor formaldehyde pollution, and the working principle is usually to convert formaldehyde into harmless substances through chemical reactions or to adsorb and fix it on the surface of materials, thereby reducing the indoor formaldehyde concentration. Chinese patent CN109529608A discloses an environmentally friendly high-efficiency photocatalyst formaldehyde scavenger with fragrance, which comprises the following raw materials: nano-titanium dioxide, a formaldehyde capture agent, nano-silver glue, levomint, Maya blue, polyoxyethylene sorbitan monooleate, benzalkonium chloride, sodium carbonate, hydrogen peroxide, and deionized water. The photocatalyst formaldehyde scavenger of the patent can improve indoor air odor, capture and decompose formaldehyde, and has disinfection and sterilization effects. However, the scavenger directly uses titanium dioxide as a photocatalyst, and the formaldehyde removal efficiency and durability still need to be improved. SUMMARY

[0003] In view of the deficiencies in the prior art, the present application provides a high-efficiency photocatalyst formaldehyde scavenger, which uses double-loaded nano-TiO2 as a photocatalyst and also adds functional sepiolite as an auxiliary agent to effectively improve the formaldehyde removal efficiency and durability of the scavenger. The present application also provides a preparation method for the high-efficiency photocatalyst formaldehyde scavenger.

[0004] The technical solution adopted by the present application is as follows:

[0005] A high-efficiency photocatalyst formaldehyde scavenger comprises the following raw materials in parts by weight: 150-250 parts by weight of water, 1-2 parts by weight of a photocatalyst, 2-4 parts by weight of functional sepiolite, 0.5-1.5 parts by weight of hydroxyethyl cellulose, 1-3 parts by weight of PEG-40 hydrogenated castor oil, 1-3 parts by weight of honeysuckle essential oil, and 0.1-0.6 parts by weight of isomeric tridecanol polyoxyethylene ether.

[0006] In order to enhance the absorption and degradation capacity of formaldehyde, the present application uses double-loaded nano-TiO2 as the photocatalyst.

[0007] Compared with directly using titanium dioxide, the TiO2 loaded with bismuth can change the electronic distribution state in the system, realize modification of the semiconductor, form a unique metal bismuth-semiconductor nano heterojunction, further separate photo-generated electrons and holes, and improve the photocatalytic activity, so that organic pollutants such as formaldehyde can be efficiently degraded in a short time, and the formaldehyde absorption capacity is enhanced.

[0008] The double-loaded nano TiO2 in the application is loaded with non-metallic nitrogen on the basis of once loading with metal bismuth, and the purpose is to replace part of oxygen atoms in the titanium dioxide lattice with non-metallic nitrogen, so as to reduce the band gap width of titanium dioxide, make the absorption spectrum wider, and achieve high catalytic effect in a wide visible light band.

[0009] The double-loaded nano TiO2 in the application is treated with (2,3-dihydroxypropyl) (2-hydroxydodecyl) dimethylammonium toluene-P-sulfonate, the chain alkyl on the alkyl benzene sulfonate can be adsorbed on the surface through hydrophobic interaction, and the sulfonate increases the charge amount on the surface, improves the electrostatic repulsion, and improves the dispersion stability of the photocatalyst in the system.

[0010] In addition, the double-loaded nano TiO2 treated with (2,3-dihydroxypropyl) (2-hydroxydodecyl) dimethylammonium toluene-P-sulfonate can also interact with the surface groups of functional sepiolite and be fixed on the functional sepiolite, effectively preventing the photocatalyst from peeling off after drying, forming a thin water layer with good durability, high formaldehyde removal efficiency and long action time.

[0011] The double-loaded nano TiO2 is prepared by the following method:

[0012] A1, bismuth nitrate is mixed with acetone, stirred at room temperature for 0.2-1h, then nano titanium dioxide is added, stirred at 30-40℃ for 5-8h, filtered, dried, then calcined at 400-500℃ for 1-3h, cooled to room temperature, to obtain a once-loaded product;

[0013] A2, the once-loaded product is calcined with urea at 300-400℃ for 1-3h, and cooled to room temperature to obtain a twice-loaded product;

[0014] A3, (2,3-dihydroxypropyl) (2-hydroxydodecyl) dimethylammonium toluene-P-sulfonate is mixed with an ethanol aqueous solution, stirred at room temperature for 0.2-1h, then the twice-loaded product is added, stirred at 70-80℃ for 10-15h, cooled to room temperature, filtered, dried, and ground to obtain the double-loaded nano TiO2.

[0015] In step A1, the weight ratio of bismuth nitrate to acetone is 5-10:100.

[0016] In step A1, the weight ratio of the bismuth nitrate to the nano-titanium dioxide is 1-3:50.

[0017] In step A2, the weight ratio of the primary loading product to the urea is 1:1-3.

[0018] In step A2, the urea is placed on the outer layer of the primary loading product, and the urea is not in direct contact with the primary loading product.

[0019] In step A3, the concentration of the aqueous ethanol solution is 60-80wt%.

[0020] In step A3, the weight ratio of the (2,3-dihydroxypropyl)(2-hydroxydodecyl)dimethylammonium toluene-p-sulfonate to the aqueous ethanol solution is 1-2:100.

[0021] In step A3, the weight ratio of the (2,3-dihydroxypropyl)(2-hydroxydodecyl)dimethylammonium toluene-p-sulfonate to the secondary loading product is 1-3:60.

[0022] In step A3, the weight ratio of the (2,3-dihydroxypropyl)(2-hydroxydodecyl)dimethylammonium toluene-p-sulfonate to the aqueous ethanol solution is 1-2:100.

[0023]

[0024] The crystal structure of the sepiolite has continuous silicon-oxygen tetrahedral layers, each silicon-oxygen tetrahedron is connected to three adjacent tetrahedrons through two corner vertices, and the special structure of the sepiolite determines that it has water channels, pores and a large surface area, and has strong adsorption capacity and can be used as an adsorption carrier; the functional sepiolite is used to capture formaldehyde in the application, the functional sepiolite is prepared by directly interacting 2,3-dihydroxypropyl-12-hydroxystearate with the surface of the pretreated sepiolite through van der Waals force, the hydrophilic group of the 2,3-dihydroxypropyl-12-hydroxystearate faces the water phase, and the hydrophilic group of the 2,3-dihydroxypropyl-12-hydroxystearate faces the water phase, which can improve the hydrophilicity and sedimentation stability of the functional sepiolite; the pore structure of the functional sepiolite adsorbs formaldehyde and other organic volatile substances, and after adsorbing formaldehyde and other organic volatile substances, the pore structure is blocked to form a closed protective film to block the release of formaldehyde and other organic volatile substances in the object into the air, thereby avoiding secondary pollution, and thus the absorption and degradation capacity of the double-loaded nano-TiO2 on formaldehyde is improved.

[0025] The functional sepiolite is prepared by the following method:

[0026] B1, mixing sepiolite and aqueous nitric acid solution, stirring at room temperature for 3-5h, filtering, washing with water until neutral, drying, and then calcining at 400-500 DEG C for 2-5h, cooling to room temperature to obtain pretreated sepiolite;

[0027] B2, the pre-processed sepiolite is mixed with acetone, stirred at room temperature for 0.2-1h, then 2,3-dihydroxypropyl-12-hydroxystearate is added, stirred at 50-55℃ for 3-5h, cooled to room temperature, filtered, dried, ground, to obtain functional sepiolite.

[0028] In step B1, the concentration of the aqueous nitric acid solution is 10-12wt%.

[0029] In step B1, the weight ratio of the sepiolite to the aqueous nitric acid solution is 1:5-10.

[0030] In step B2, the weight ratio of the pre-processed sepiolite to acetone is 1:5-10.

[0031] In step B2, the weight ratio of the 2,3-dihydroxypropyl-12-hydroxystearate to the pre-processed sepiolite is 1:15-20.

[0032] wherein the 2,3-dihydroxypropyl-12-hydroxystearate, CAS: 6284-43-1, has the following structural formula:

[0033]

[0034] The application also provides a preparation method of the above high-efficiency photocatalyst formaldehyde scavenger, comprising the following steps:

[0035] According to the raw material formula, the hydroxyethyl cellulose, PEG-40 hydrogenated castor oil and water are mixed and stirred uniformly; then the photocatalyst and the functional sepiolite are added and stirred uniformly; finally, the honeysuckle essential oil and isomeric tridecanol polyoxyethylene ether are added and stirred uniformly, to obtain the high-efficiency photocatalyst formaldehyde scavenger.

[0036] In the application, the PEG-40 hydrogenated castor oil serves as a solubilizing aid, and the hydroxyethyl cellulose serves as a dispersing aid, which can increase the dispersibility and compatibility of the components in the water system, and is conducive to forming a uniform and stable solution system; the isomeric tridecanol polyoxyethylene ether serves as a penetration aid, which can effectively penetrate the photocatalyst into the surface of an object, increase the attachment area, and be conducive to stable and long-lasting photocatalytic capacity.

[0037] The application has the following beneficial effects: the functional sepiolite in the application adsorbs pollutants such as formaldehyde in the air, and the double-loaded nanometer TiO2 serves as a photocatalyst to decompose the pollutants enriched in the functional sepiolite until the pollutants are converted into harmless substances, so as to achieve the purpose of scavenging formaldehyde and purifying air; the two components assist each other, so that the adsorption rate of the formaldehyde scavenger is faster, the photocatalytic efficiency is higher, and the formaldehyde scavenging efficiency and durability of the scavenger are effectively improved. DETAILED DESCRIPTION

[0038] The endpoints of the ranges and any values disclosed herein are not limited to the precise values recited as implicitly split by the language of the specification. The endpoints of the ranges and any values are to be construed as specifically included. Ranges produced by use of these language phrases are only intended to serve as metaphors to provide more clarity by identifying closely grouped values of endpoints. No attempt is made to convey to the person of ordinary skill in the art limitations which are not actually implied by the language and context found in the specification.

[0039] The raw materials used in the examples are introduced as follows:

[0040] PEG-40 hydrogenated castor oil, item number: CO-40, purchased from Guangzhou Naleng Chemical Co., Ltd.

[0041] Isomeric tridecanol polyoxyethylene ether, item number: E-1304, purchased from Sanda Chemical (Nantong) Co., Ltd.

[0042] Hydroxyethyl cellulose, item number: A15978, purchased from Beijing Wakai Biological Technology Co., Ltd.

[0043] Honeysuckle essential oil, CAS: 8023-93-6, item number: DVYPJB011, purchased from Shenzhen Dewei Jia Biological Technology Co., Ltd.

[0044] Sepiolite, item number: KX-HPS, 200 mesh, powder, purchased from Hebei Kexu Building Material Co., Ltd.

[0045] Nano titanium dioxide, 5-10 nm, anatase type, item number: TTP-A10, purchased from Jining Huakai Resin Co., Ltd.

[0046] Example 1

[0047] A high-efficiency photocatalyst formaldehyde scavenger, comprising the following raw materials in parts by weight: 200 parts by weight of water, 1.8 parts by weight of photocatalyst, 3.2 parts by weight of functional sepiolite, 1 part by weight of hydroxyethyl cellulose, 2 parts by weight of PEG-40 hydrogenated castor oil, 2 parts by weight of honeysuckle essential oil, and 0.5 parts by weight of isomeric tridecanol polyoxyethylene ether.

[0048] The photocatalyst is a double-loaded nano TiO2.

[0049] The double-loaded nano TiO2 is prepared by the following method:

[0050] A1, mix bismuth nitrate with acetone, stir at room temperature for 0.5 h, then add nano titanium dioxide, stir at 35°C for 6 h, filter, dry, then calcine at 450°C for 2 h, cool to room temperature to obtain a primary loaded product; the weight ratio of bismuth nitrate to acetone is 7:100; the weight ratio of bismuth nitrate to nano titanium dioxide is 2:50;

[0051] A2, the primary loaded product and urea are placed at 350℃ for calcination for 2h, and cooled to room temperature to obtain a secondary loaded product; the weight ratio of the primary loaded product to urea is 1:2; the urea is placed on the outer layer of the primary loaded product, and the urea is not in direct contact with the primary loaded product;

[0052] A3, (2,3-dihydroxypropyl)(2-hydroxydodecyl)dimethylammonium toluene-p-sulfonate is mixed with 70wt% aqueous ethanol solution, stirred at room temperature for 0.5h, then the secondary loaded product is added, stirred at 75℃ for 12h, cooled to room temperature, filtered, dried, and ground to obtain the double-loaded nano-TiO2. The weight ratio of (2,3-dihydroxypropyl)(2-hydroxydodecyl)dimethylammonium toluene-p-sulfonate to aqueous ethanol solution is 1.5:100; the weight ratio of (2,3-dihydroxypropyl)(2-hydroxydodecyl)dimethylammonium toluene-p-sulfonate to the secondary loaded product is 2:60.

[0053] The functional sepiolite is prepared by the following method:

[0054] B1, sepiolite is mixed with 11.5wt% aqueous nitric acid solution, stirred at room temperature for 4h, filtered, washed with water until neutral, dried, and then placed at 450℃ for calcination for 3h, and cooled to room temperature to obtain pretreated sepiolite; the weight ratio of sepiolite to aqueous nitric acid solution is 1:7;

[0055] B2, the pretreated sepiolite is mixed with acetone, stirred at room temperature for 0.5h, then 2,3-dihydroxypropyl-12-hydroxystearate is added, stirred at 53℃ for 4.5h, cooled to room temperature, filtered, dried, and ground to obtain functional sepiolite. The weight ratio of pretreated sepiolite to acetone is 1:7; the weight ratio of 2,3-dihydroxypropyl-12-hydroxystearate to pretreated sepiolite is 1:18.

[0056] A method for preparing a high-efficiency photocatalyst formaldehyde scavenger, comprising the following steps:

[0057] According to the raw material formula, hydroxyethyl cellulose, PEG-40 hydrogenated castor oil, and water are mixed and stirred uniformly; then photocatalyst and functional sepiolite are added and stirred uniformly; finally honeysuckle essential oil and isomeric tridecanol polyoxyethylene ether are added and stirred uniformly to obtain the high-efficiency photocatalyst formaldehyde scavenger.

[0058] Example 2

[0059] A high-efficiency photocatalyst formaldehyde scavenger comprises the following raw materials by weight: 200 parts by weight of water, 1.8 parts by weight of photocatalyst, 3.2 parts by weight of functional sepiolite, 1 part by weight of hydroxyethyl cellulose, 2 parts by weight of PEG-40 hydrogenated castor oil, 2 parts by weight of honeysuckle essential oil, and 0.5 parts by weight of isomeric tridecanol polyoxyethylene ether.

[0060] The photocatalyst is prepared by the following method:

[0061] A1, mixing bismuth nitrate and acetone, stirring at room temperature for 0.5 h, then adding nano titanium dioxide, stirring at 35℃ for 6 h, filtering, drying, and calcining at 450℃ for 2 h, cooling to room temperature to obtain a primary loading product; the weight ratio of bismuth nitrate to acetone is 7:100; the weight ratio of bismuth nitrate to nano titanium dioxide is 2:50;

[0062] A2, mixing (2,3-dihydroxypropyl)(2-hydroxydodecyl)dimethylammonium toluene-p-sulfonate and 70wt% ethanol aqueous solution, stirring at room temperature for 0.5 h, then adding the primary loading product, stirring at 75℃ for 12 h, cooling to room temperature, filtering, drying, and grinding to obtain the photocatalyst. The weight ratio of (2,3-dihydroxypropyl)(2-hydroxydodecyl)dimethylammonium toluene-p-sulfonate to ethanol aqueous solution is 1.5:100; the weight ratio of (2,3-dihydroxypropyl)(2-hydroxydodecyl)dimethylammonium toluene-p-sulfonate to the primary loading product is 2:60.

[0063] The functional sepiolite is prepared by the following method:

[0064] B1, mixing sepiolite and 11.5wt% nitric acid aqueous solution, stirring at room temperature for 4 h, filtering, washing with water until neutral, drying, and calcining at 450℃ for 3 h, cooling to room temperature to obtain pretreated sepiolite; the weight ratio of sepiolite to nitric acid aqueous solution is 1:7;

[0065] B2, mixing pretreated sepiolite and acetone, stirring at room temperature for 0.5 h, then adding 2,3-dihydroxypropyl-12-hydroxystearate, stirring at 53℃ for 4.5 h, cooling to room temperature, filtering, drying, and grinding to obtain functional sepiolite. The weight ratio of pretreated sepiolite to acetone is 1:7; the weight ratio of 2,3-dihydroxypropyl-12-hydroxystearate to pretreated sepiolite is 1:18.

[0066] A method for preparing a high-efficiency photocatalyst formaldehyde scavenger comprises the following steps:

[0067] According to the raw material formula, the hydroxyethyl cellulose, PEG-40 hydrogenated castor oil and water are mixed and stirred uniformly; then the photocatalyst and functional sepiolite are added and stirred uniformly; finally the honeysuckle essential oil and isomeric tridecanol polyoxyethylene ether are added and stirred uniformly to obtain the high-efficiency photocatalyst formaldehyde scavenger.

[0068] Example 3

[0069] A high-efficiency photocatalyst formaldehyde scavenger comprises the following raw materials by weight: 200 parts by weight of water, 1.8 parts by weight of photocatalyst, 3.2 parts by weight of functional sepiolite, 1 part by weight of hydroxyethyl cellulose, 2 parts by weight of PEG-40 hydrogenated castor oil, 2 parts by weight of honeysuckle essential oil, and 0.5 parts by weight of isomeric tridecanol polyoxyethylene ether.

[0070] The photocatalyst is prepared by the following method:

[0071] A1, bismuth nitrate and acetone are mixed and stirred at room temperature for 0.5 h, then nano-titanium dioxide is added and stirred at 35℃ for 6 h, filtered, dried, and then calcined at 450℃ for 2 h, cooled to room temperature to obtain a primary loading product; the weight ratio of bismuth nitrate to acetone is 7:100; the weight ratio of bismuth nitrate to nano-titanium dioxide is 2:50;

[0072] A2, the primary loading product and urea are calcined at 350℃ for 2 h, cooled to room temperature to obtain the photocatalyst. The weight ratio of the primary loading product to urea is 1:2; the urea is placed on the outer layer of the primary loading product, and the urea does not directly contact the primary loading product.

[0073] The functional sepiolite is prepared by the following method:

[0074] B1, sepiolite and 11.5wt% nitric acid aqueous solution are mixed and stirred at room temperature for 4 h, filtered, washed with water until neutral, dried, and then calcined at 450℃ for 3 h, cooled to room temperature to obtain a pretreated sepiolite; the weight ratio of sepiolite to nitric acid aqueous solution is 1:7;

[0075] B2, the pretreated sepiolite and acetone are mixed and stirred at room temperature for 0.5 h, then 2,3-dihydroxypropyl-12-hydroxystearate is added and stirred at 53℃ for 4.5 h, cooled to room temperature, filtered, dried, and ground to obtain the functional sepiolite. The weight ratio of the pretreated sepiolite to acetone is 1:7; the weight ratio of 2,3-dihydroxypropyl-12-hydroxystearate to the pretreated sepiolite is 1:18.

[0076] A method for preparing a high-efficiency photocatalyst formaldehyde scavenger comprises the following steps:

[0077] According to the raw material formula, hydroxyethyl cellulose, PEG-40 hydrogenated castor oil and water are mixed and stirred uniformly; then the photocatalyst and functional sepiolite are added and stirred uniformly; finally, honeysuckle essential oil and isomeric tridecanol polyoxyethylene ether are added and stirred uniformly to obtain the high-efficiency photocatalyst formaldehyde scavenger.

[0078] Example 4

[0079] A high-efficiency photocatalyst formaldehyde scavenger comprises the following raw materials by weight: 200 parts by weight of water, 1.8 parts by weight of photocatalyst, 3.2 parts by weight of functional sepiolite, 1 part by weight of hydroxyethyl cellulose, 2 parts by weight of PEG-40 hydrogenated castor oil, 2 parts by weight of honeysuckle essential oil, and 0.5 parts by weight of isomeric tridecanol polyoxyethylene ether.

[0080] The photocatalyst is prepared by the following method:

[0081] Bismuth nitrate and acetone are mixed and stirred at room temperature for 0.5 h, then nano-titanium dioxide is added and stirred at 35℃ for 6 h, filtered, dried, and calcined at 450℃ for 2 h, and then cooled to room temperature to obtain the photocatalyst. The weight ratio of bismuth nitrate to acetone is 7:100; the weight ratio of bismuth nitrate to nano-titanium dioxide is 2:50.

[0082] The functional sepiolite is prepared by the following method:

[0083] B1, sepiolite and 11.5wt% nitric acid aqueous solution are mixed and stirred at room temperature for 4 h, filtered, washed with water until neutral, dried, and then calcined at 450℃ for 3 h, and then cooled to room temperature to obtain the pretreated sepiolite; the weight ratio of sepiolite to nitric acid aqueous solution is 1:7;

[0084] B2, the pretreated sepiolite and acetone are mixed and stirred at room temperature for 0.5 h, then 2,3-dihydroxypropyl-12-hydroxystearate is added and stirred at 53℃ for 4.5 h, cooled to room temperature, filtered, dried, and ground to obtain the functional sepiolite. The weight ratio of pretreated sepiolite to acetone is 1:7; the weight ratio of 2,3-dihydroxypropyl-12-hydroxystearate to pretreated sepiolite is 1:18.

[0085] A preparation method of a high-efficiency photocatalyst formaldehyde scavenger comprises the following steps:

[0086] According to the raw material formula, hydroxyethyl cellulose, PEG-40 hydrogenated castor oil and water are mixed and stirred uniformly; then the photocatalyst and functional sepiolite are added and stirred uniformly; finally, honeysuckle essential oil and isomeric tridecanol polyoxyethylene ether are added and stirred uniformly to obtain the high-efficiency photocatalyst formaldehyde scavenger.

[0087] Example 5

[0088] A high-efficiency photocatalyst formaldehyde scavenger comprises the following raw material components by weight: 200 parts by weight of water, 1.8 parts by weight of photocatalyst, 3.2 parts by weight of functional sepiolite, 1 part by weight of hydroxyethyl cellulose, 2 parts by weight of PEG-40 hydrogenated castor oil, 2 parts by weight of honeysuckle essential oil, and 0.5 parts by weight of isomeric tridecanol polyoxyethylene ether.

[0089] The photocatalyst is nano TiO2.

[0090] The functional sepiolite is prepared by the following method:

[0091] B1, mixing sepiolite and 11.5wt% nitric acid aqueous solution, stirring at room temperature for 4h, filtering, washing with water until neutral, drying, and then calcining at 450℃ for 3h, cooling to room temperature to obtain pretreated sepiolite; the weight ratio of the sepiolite to the nitric acid aqueous solution is 1:7;

[0092] B2, mixing the pretreated sepiolite and acetone, stirring at room temperature for 0.5h, then adding 2,3-dihydroxypropyl-12-hydroxystearate, stirring at 53℃ for 4.5h, cooling to room temperature, filtering, drying, and grinding to obtain functional sepiolite; the weight ratio of the pretreated sepiolite to the acetone is 1:7; and the weight ratio of the 2,3-dihydroxypropyl-12-hydroxystearate to the pretreated sepiolite is 1:18.

[0093] A preparation method of a high-efficiency photocatalyst formaldehyde scavenger comprises the following steps:

[0094] According to the raw material formula, the hydroxyethyl cellulose, the PEG-40 hydrogenated castor oil, and the water are mixed and stirred uniformly; then the photocatalyst and the functional sepiolite are added and stirred uniformly; finally, the honeysuckle essential oil and the isomeric tridecanol polyoxyethylene ether are added and stirred uniformly to obtain the high-efficiency photocatalyst formaldehyde scavenger.

[0095] Example 6

[0096] A high-efficiency photocatalyst formaldehyde scavenger comprises the following raw material components by weight: 200 parts by weight of water, 1.8 parts by weight of photocatalyst, 3.2 parts by weight of pretreated sepiolite, 1 part by weight of hydroxyethyl cellulose, 2 parts by weight of PEG-40 hydrogenated castor oil, 2 parts by weight of honeysuckle essential oil, and 0.5 parts by weight of isomeric tridecanol polyoxyethylene ether.

[0097] The photocatalyst is double-loaded nano TiO2.

[0098] The double-loaded nano TiO2 is prepared by the following method:

[0099] A1, mixing bismuth nitrate with acetone, stirring at room temperature for 0.5 h, then adding nano titanium dioxide, stirring at 35℃ for 6 h, filtering, drying, then calcining at 450℃ for 2 h, cooling to room temperature to obtain a primary loaded product; the weight ratio of the bismuth nitrate to the acetone is 7:100; the weight ratio of the bismuth nitrate to the nano titanium dioxide is 2:50;

[0100] A2, calcining the primary loaded product with urea at 350℃ for 2 h, cooling to room temperature to obtain a secondary loaded product; the weight ratio of the primary loaded product to the urea is 1:2; the urea is placed on the outer layer of the primary loaded product, and the urea does not directly contact the primary loaded product;

[0101] A3, mixing (2,3-dihydroxypropyl)(2-hydroxydodecyl)dimethylammonium toluene-p-sulfonate with a 70wt% aqueous ethanol solution, stirring at room temperature for 0.5 h, then adding the secondary loaded product, stirring at 75℃ for 12 h, cooling to room temperature, filtering, drying, and grinding to obtain the double-loaded nano TiO2. The weight ratio of the (2,3-dihydroxypropyl)(2-hydroxydodecyl)dimethylammonium toluene-p-sulfonate to the aqueous ethanol solution is 1.5:100; the weight ratio of the (2,3-dihydroxypropyl)(2-hydroxydodecyl)dimethylammonium toluene-p-sulfonate to the secondary loaded product is 2:60.

[0102] The pre-treated sepiolite is prepared by the following method:

[0103] Mixing sepiolite with 11.5wt% aqueous nitric acid solution, stirring at room temperature for 4 h, filtering, washing with water until neutral, drying, then calcining at 450℃ for 3 h, cooling to room temperature to obtain the pre-treated sepiolite. The weight ratio of the sepiolite to the aqueous nitric acid solution is 1:7.

[0104] A preparation method of a high-efficiency photocatalyst formaldehyde scavenger, comprising the following steps:

[0105] According to the raw material formula, mixing hydroxyethyl cellulose, PEG-40 hydrogenated castor oil and water, stirring uniformly; then adding photocatalyst and pre-treated sepiolite, stirring uniformly; finally adding honeysuckle essential oil and isomeric tridecanol polyoxyethylene ether, stirring uniformly to obtain the high-efficiency photocatalyst formaldehyde scavenger.

[0106] Test Example 1

[0107] The bacteriostatic rate of the formaldehyde scavenger of Example 1 is determined according to the method of QB / T 2738-2012 standard. The test results show that the bacteriostatic rate of the formaldehyde scavenger of Example 1 on three typical bacteria (Escherichia coli, Staphylococcus aureus, Candida albicans) all reaches more than 99%, and has good bacteriostatic performance.

[0108] Test Example 2

[0109] The formaldehyde removal rate of the formaldehyde scavenger of each of the above examples was determined according to the method of QB / T 2761-2006 standard. Two air test chambers (A is a blank chamber, B is a sample test chamber) were used for testing. 100 mL of the sample of the example was sprayed on 1 m 2 The medical absorbent cotton gauze was wound on a glass rod with a diameter of 5 mm and a length of 30 cm, fixed with cotton thread and stood upright in a 500 mL reagent bottle, and 200 mL of pollutants (formaldehyde 0.2 wt%) was filled. The blank base paper was hung in the blank chamber A, and the base paper sprayed with the sample was hung in the sample test chamber B. The container with the prepared pollutant release source was placed in the blank chamber A and the sample test chamber B, respectively, and the chamber door was immediately closed. After 24 h, the concentration of air pollutants in the two chambers was sampled and analyzed.

[0110] The formaldehyde removal rate % = (X0-X1) / X0x100%, wherein X0 is the concentration of formaldehyde in the blank chamber after 24 h, and X1 is the concentration of formaldehyde in the sample test chamber after 24 h.

[0111] Table 1. Test results of formaldehyde removal rate

[0112] Formaldehyde removal rate, % Example 1 99.73 Example 2 94.61 Example 3 95.07 Example 4 88.95 Example 5 81.62 Example 6 96.34

[0113] The present application can absorb pollutants such as formaldehyde in air by using functional sepiolite as an auxiliary agent, and can decompose the pollutants enriched in the functional sepiolite by using double-loaded nano-TiO2 as a photocatalyst until the pollutants are converted into harmless substances, so as to achieve the purposes of removing formaldehyde and purifying air. The two can assist each other to make the adsorption rate of the formaldehyde remover faster and the photocatalytic efficiency higher. Compared with Example 5 directly using titanium dioxide, the TiO2 loaded with bismuth in Example 1 can change the electronic distribution state in the system, realize the modification of the semiconductor, form a unique metal bismuth-semiconductor nano-heterojunction, further separate the photo-generated electrons and holes, and improve the photocatalytic activity, so that the organic pollutants such as formaldehyde can be efficiently degraded in a short time, and the formaldehyde absorption capacity is enhanced. Compared with Examples 2-4, the double-loaded nano-TiO2 in Example 1 is loaded with non-metallic nitrogen on the basis of loading metal bismuth once, and the purpose is to use non-metallic nitrogen to replace part of oxygen atoms in the titanium dioxide lattice, so as to reduce the band gap width of titanium dioxide, make the absorption spectrum wider, and achieve high catalytic effect in a wide visible light band. Then, (2, 3-dihydroxypropyl) (2-hydroxydodecyl) dimethyl ammonium toluene-p-sulfonate is used to treat the double-loaded titanium dioxide, the chain alkyl on the alkyl benzene sulfonate can be adsorbed on the surface thereof through hydrophobic interaction, and the sulfonate increases the charge amount on the surface thereof, improves the electrostatic repulsion, and improves the dispersion stability of the photocatalyst in the system. Compared with Example 6, the double-loaded nano-TiO2 treated by (2, 3-dihydroxypropyl) (2-hydroxydodecyl) dimethyl ammonium toluene-p-sulfonate in Example 1 can also interact with the surface groups of the functional sepiolite and be fixed on the functional sepiolite, effectively preventing the photocatalyst from peeling off after drying, forming a thin water layer with good durability, high formaldehyde removal efficiency, long action time, and the pore structure of the functional sepiolite can adsorb organic volatile substances such as formaldehyde, and after adsorbing the organic volatile substances such as formaldehyde, the pore structure is blocked to form a closed protective film to block the release of the organic volatile substances such as formaldehyde in the object into the air, thereby avoiding secondary pollution and assisting to improve the absorption and degradation capacity of the double-loaded nano-TiO2 for formaldehyde.

[0114] The above describes preferred embodiments of the present application. It should be understood that the described embodiments are only part of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the present application.

Claims

1. A highly efficient photocatalytic formaldehyde remover, characterized in that, It comprises the following raw materials in parts by weight: 150-250 parts water, 1-2 parts dual-loaded nano-TiO2, 2-4 parts functional sepiolite, 0.5-1.5 parts hydroxyethyl cellulose, 1-3 parts PEG-40 hydrogenated castor oil, 1-3 parts plant essential oil, and 0.1-0.6 parts isomeric tridecyl alcohol polyoxyethylene ether. The dual-loaded nano-TiO2 was prepared by the following method: Bismuth nitrate was mixed with acetone and stirred at room temperature for 0.2-1 h. Then nano-titanium dioxide was added and stirred at 30-40 °C for 5-8 h. The mixture was filtered, dried, and then calcined at 400-500 °C for 1-3 h. After cooling to room temperature, a primary loading product was obtained. The weight ratio of bismuth nitrate to nano-titanium dioxide was 1-3:

50. The primary loading product and urea are calcined at 300-400℃ for 1-3 hours and cooled to room temperature to obtain the secondary loading product; the weight ratio of the primary loading product to urea is 1:1-3. (2,3-Dihydroxypropyl)(2-hydroxydodecyl)dimethylammonium toluene-P-sulfonate was mixed with an aqueous ethanol solution and stirred at room temperature for 0.2-1 h. Then, the secondary loading product was added, and the mixture was stirred at 70-80 °C for 10-15 h. After cooling to room temperature, the mixture was filtered, dried, and ground to obtain the dual-loaded nano-TiO2. The weight ratio of (2,3-dihydroxypropyl)(2-hydroxydodecyl)dimethylammonium toluene-P-sulfonate to the secondary loading product was 1-3:

60. The functional sepiolite is prepared by the following method: Sepiolite was mixed with nitric acid aqueous solution, stirred at room temperature for 3-5 hours, filtered, washed with water until neutral, dried, and then calcined at 400-500℃ for 2-5 hours. After cooling to room temperature, pretreated sepiolite was obtained. Pretreated sepiolite was mixed with acetone and stirred at room temperature for 0.2-1 h. Then 2,3-dihydroxypropyl-12-hydroxystearate was added and stirred at 50-55°C for 3-5 h. After cooling to room temperature, the mixture was filtered, dried, and ground to obtain functional sepiolite. The weight ratio of 2,3-dihydroxypropyl-12-hydroxystearate to pretreated sepiolite was 1:15-20.

2. The high-efficiency photocatalytic formaldehyde remover as described in claim 1, characterized in that, The concentration of the ethanol aqueous solution is 60-80 wt%; the weight ratio of (2,3-dihydroxypropyl)(2-hydroxydodecyl)dimethylammonium toluene-P-sulfonate to the ethanol aqueous solution is 1-2:

100.

3. The high-efficiency photocatalytic formaldehyde remover as described in claim 1, characterized in that, The concentration of the nitric acid aqueous solution is 10-12 wt%; the weight ratio of sepiolite to the nitric acid aqueous solution is 1:5-10.

4. The preparation method of the high-efficiency photocatalytic formaldehyde remover according to any one of claims 1-3, characterized in that, Includes the following steps: Hydroxyethyl cellulose, PEG-40 hydrogenated castor oil, and water were mixed and stirred until homogeneous. Then, dual-loaded nano-TiO2 and functional sepiolite were added and stirred until homogeneous. Finally, plant essential oil and isomeric tridecyl alcohol polyoxyethylene ether were added and stirred until homogeneous to obtain the highly efficient photocatalytic formaldehyde remover.

Images