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A kind of air purification photocatalyst and preparation method thereof

A photocatalyst, air purification technology, applied in physical/chemical process catalysts, chemical instruments and methods, botanical equipment and methods, etc., to achieve the effects of high octahedral symmetry, excellent photocatalytic activity, and rich source of raw materials

Active Publication Date: 2017-07-21
LUOYANG INST OF SCI & TECH
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  • Summary
  • 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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  • A kind of air purification photocatalyst and preparation method thereof
  • A kind of air purification photocatalyst and preparation method thereof

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preparation example Construction

[0027] A preparation method of air purification photocatalyst includes the following steps:

[0028] Step 1: According to the molar ratio of titanium element, sulfur element and lanthanum element 1: (0.1~2): (0.001~0.015), respectively take the titanium source, sulfur source and lanthanum source, and add the obtained titanium source In water ethanol, then, 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, ready for use;

[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. The lanthanum source is any one of lanthanum sulfate or lanthanum nitrate; the dispersant is polyethylene glycol 200, polyethylene glycol 300, polyethylene glycol 400, Tween 20, Tween 80 or poly Any of oxyethyl...

Embodiment 1

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

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

[0039] ③ Put the prepared solution A in a 60 ℃ constant temperature water bath and magnetically stir for 10 min;

[0040] ④ Slowly add liquid B into liquid A under stirring. The completion time of titration is 30 minutes to obtain a transparent colloid.

[0041] ⑤The 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 with exothermic phenomenon. After reacting for a period of time, it was placed in a drying oven and dried for 16 hours.

[0042] ⑥ P...

Embodiment 2

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

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

[0051] ③ Put the prepared solution A in a 70℃ constant temperature water bath and magnetically stir for 10 min;

[0052] ④Slowly add liquid B into liquid A under stirring. The completion time of titration is 30 minutes to obtain a transparent colloid.

[0053] ⑤The 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 with exothermic phenomenon. After reacting for a period of time, it was placed in a drying oven and dried for 24 hour...

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Abstract

A photocatalyst for air purification, the catalyst is based on anatase titanium dioxide, with sulfur and lanthanum as doping components, wherein the molar ratio of sulfur, lanthanum and titanium dioxide is (0.1~2): (0.001~0.015): 1, and the catalyst exists in powder form. The preparation process of the catalyst includes feeding titanium source, sulfur source and lanthanum source according to a certain ratio, adding dispersant and inhibitor, hydrolyzing to form gel under the conditions of 10~80℃, PH=2~7, and drying in a constant temperature drying oven , into the muffle furnace burning and other steps. The anatase-type sulfur-lanthanum co-doped nano-titanium dioxide powder prepared by the invention has uniform particle size, controllable particle size and good dispersibility. It has a good catalytic degradation and purification effect on harmful gases such as formaldehyde in the air environment, and has good antibacterial properties.

Description

Technical field [0001] The invention relates to the technical field of air purification materials, in particular to an anatase-type lanthanum sulphur co-doped nano-titanium dioxide photocatalyst which is mainly used for the degradation and sterilization of formaldehyde 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 are paying more and more attention to home decoration. Because of the use of resin 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 them, formaldehyde has the greatest impact on human health. Solving indoor environmental pollution has become a hot spot that people are currently paying attention to. Photocatalysts are an ai...

Claims

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Application Information

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Patent Type & Authority Patents(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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