Air purifying photocatalyst and preparation method thereof

A photocatalyst and air purification technology, applied in the direction of physical/chemical process catalysts, chemical instruments and methods, botanical equipment and methods, etc., to achieve the effect of rich raw material sources, small particle size, and controllable particle size

Active Publication Date: 2015-05-20
LUOYANG INST OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The above reports are all on nano-TiO 2 The photocatalytic activity of formaldehyde was studied, but nano-TiO was co-doped with rare earth elements and transition metals 2 , there is no report on the degradation performance of formaldehyde and the research on air sterilization

Method used

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  • Air purifying photocatalyst and preparation method thereof
  • Air purifying photocatalyst and preparation method thereof

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preparation example Construction

[0027] A method for preparing an air-purifying photocatalyst, comprising the following steps:

[0028] Step 1: Take titanium source, sulfur source and lanthanum source respectively according to the molar ratio of titanium element, sulfur element and lanthanum element in the ratio of 1: (0.1~2): (0.001~0.015), and add the obtained titanium source to the In water ethanol, after that, add dispersant and inhibitor to the obtained mixed solution, wherein, the volume ratio of titanium source, dispersant and inhibitor to absolute ethanol is (17-20): (2.5-3): ( 4-5): 40, after fully mixing, get mixed solution A, set aside;

[0029] The titanium source is any one of tetrabutyl titanate or isopropyl titanate. The sulfur source is any one of thiourea, sodium thiosulfate, ammonium sulfide or thioacetamide. Described lanthanum source is any one in lanthanum sulfate or lanthanum nitrate; Described dispersion agent is Polyethylene Glycol 200, Polyethylene Glycol 300, Polyethylene Glycol 40...

Embodiment 1

[0037] ①Measure 20mL of tetrabutyl titanate, 40mL of absolute ethanol, 3ml of inhibitor triethylamine, and 4ml of dispersant polyethylene glycol 400, and mix them uniformly to prepare solution A;

[0038] ②Measure 40mL of absolute ethanol, 10mL of distilled water (containing 0.2g of lanthanum nitrate as a dopant), and 5ml of glacial acetic acid and mix evenly under stirring to prepare solution B;

[0039] ③Place the prepared solution A in a constant temperature water bath at 60°C for 10 minutes with magnetic stirring;

[0040] ④ Slowly add liquid B dropwise into liquid A under stirring, and the titration time is 30 minutes to obtain a transparent colloid.

[0041] ⑤ The TiO obtained above 2 The sol was poured into a 250 mL beaker, and 4.56 g of thiourea was added under magnetic stirring. At this time, the clear and transparent sol turned into a yellow gel, and at the same time, there was an exothermic phenomenon. After a period of reaction, it was put into a drying oven to d...

Embodiment 2

[0049] ①Measure 17mL of isopropyl titanate, 40mL of absolute ethanol, 2.5ml of inhibitor triethanolamine, and 5ml of dispersant polyethylene glycol 200, and mix uniformly to prepare solution A;

[0050] ②Measure 40mL of absolute ethanol, 10mL of distilled water (including 0.034g of lanthanum sulfate as a dopant), and 10ml of glacial acetic acid and mix them uniformly to prepare solution B;

[0051] ③Place the prepared solution A in a constant temperature water bath at 70°C for 10 minutes with magnetic stirring;

[0052] ④ Slowly add liquid B dropwise into liquid A under stirring, and the titration time is 30 minutes to obtain a transparent colloid.

[0053] ⑤ The TiO obtained above 2 The sol was poured into a 250 mL beaker, and 4.74 g of sodium thiosulfate was added under magnetic stirring. At this time, the clear and transparent sol turned into a yellow gel, and at the same time, there was an exothermic phenomenon. After a period of reaction, it was put into a drying oven t...

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Abstract

The invention discloses an air purifying photocatalyst. Anatase type titanium dioxide acts as a base body of the catalyst, and sulfur and lanthanum act as doped components, wherein the mole ratio of sulfur to lanthanum to titanium dioxide is (0.1-2) to (0.001-0.015) to 1, and the catalyst exists in a form of powder. The preparation process of the catalyst comprises the following steps of feeding the titanium source, the sulfur source and the lanthanum source according to a certain ratio, adding a dispersing agent and an inhibitor, hydrolyzing at the temperature of 10-80 DEG C with the pH of 2-7 so as to generate gel, drying at constant temperature in a drying oven, putting into a muffle furnace, firing and the like. The prepared anatase type sulfur and lanthanum codoped nano titanium dioxide powder is uniform in particle size, is controllable in particle size, is good in dispersibility, has a good catalytic degradation and purification effect on harmful gases, such as formaldehyde in an air environment, and meanwhile has a good antibacterial property.

Description

technical field [0001] The invention relates to the technical field of air purification materials, in particular to an anatase-type sulfur-lanthanum co-doped nano-titanium dioxide photocatalyst mainly used for formaldehyde degradation and sterilization in the air and a preparation method thereof. Background technique [0002] With the development of my country's economy and society, people's living standards continue to improve, and people pay more and more attention to home environment decoration. However, due to the use of resins and adhesives in various indoor decoration materials and furniture, harmful substances contained in them are released. It will cause indoor air pollution. Pollutants in the air mainly include organic volatiles such as formaldehyde, toluene and xylene, among which formaldehyde has the greatest impact on human health. Solving indoor environmental pollution has become a hot spot that people pay attention to at present, and photocatalyst is a kind of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/02A01N59/16A01P1/00A01P3/00B01D53/72B01D53/86
Inventor 张拦武亦文李秀倜王晓娜
Owner LUOYANG INST OF SCI & TECH
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