A pt-tio 2 -sio 2 Photocatalytic self-cleaning composite material and preparation method thereof

A pt-tio2-sio2, composite material technology, applied in metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problem of narrow photoresponsivity range and complex operation , inapplicability and other problems, to achieve the effects of strong hydrophobicity and self-cleaning ability, wide light response range and simple preparation method

Active Publication Date: 2020-12-04
NANXIONG MATERIAL PRODION BASE OF CHINESE ACADEMY OF SCI GUANGZHOU CHEM +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main component of the coating is only titanium dioxide. The performance of the coating material is single and unstable, and it is extremely vulnerable to external corrosion, which is not conducive to the long-term use of the coating. Moreover, its photoresponsive range is narrow and the utilization rate of visible light is low. Therefore, the catalytic self-cleaning efficiency Low
In addition, the coating requires thermal spraying pretreatment, which is complicated to operate and is not suitable for existing building surfaces

Method used

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  • A pt-tio <sub>2</sub> -sio <sub>2</sub> Photocatalytic self-cleaning composite material and preparation method thereof
  • A pt-tio <sub>2</sub> -sio <sub>2</sub> Photocatalytic self-cleaning composite material and preparation method thereof
  • A pt-tio <sub>2</sub> -sio <sub>2</sub> Photocatalytic self-cleaning composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] This embodiment provides a Pt-TiO 2 -SiO 2 Photocatalytic self-cleaning composite material and preparation method thereof.

[0033] At room temperature, add 0.414g oxalic acid, 7.2g deionized water, 4g absolute ethanol and 2.2g PDMS to a 100mL single-necked flask, and magnetically stir for 90min to obtain a two-phase solution; take 16g absolute ethanol, 0.48g TTIP and 1.37mg of chloroplatinic acid solution (concentration: 10g / L) was magnetically stirred and mixed in a 50mL beaker to obtain solution A; -1 Slowly add solution A dropwise to the biphasic solution within 2 hours at a rate of 2 hours, stir and react for 24 hours. -2 ) under light for 20 minutes; after the reaction, add 20.83g TEOS, continue to stir and react for 2 hours, and obtain a transparent and uniform sol, which is the Pt-TiO 2 -SiO 2 Photocatalytic self-cleaning composite material, label PTS-1 (P: Pt; T: TiO 2 ; S: SiO 2 ).

[0034] The physical figure of the product obtained in this embodiment ...

Embodiment 2

[0038] At room temperature, add 0.43g oxalic acid, 7.2g deionized water, 4g absolute ethanol and 2.2g PDMS to a 100mL single-necked flask, and magnetically stir for 110min to obtain a two-phase solution; take 16g absolute ethanol, 0.49g TTIP and 8.8mg of chloroplatinic acid solution was magnetically stirred and mixed in a 50mL beaker to obtain solution A, and then used a flow-type peristaltic pump at 150μL·min -1 Slowly add solution A dropwise to the biphasic solution within 140min at a rate of 140min, stir and react for 22h. -2) under light for 25min; after the reaction, add 21.0g TEOS, continue to stir and react for 1.5h, and obtain a transparent and uniform sol, which is the Pt-TiO 2 -SiO 2 Photocatalytic self-cleaning composite material, marked PTS-2.

[0039] The product obtained in this embodiment is used for visible light catalytic degradation of methyl orange, and the results are as follows Figure 4 As shown, after 52h of visible light (8W×4, 15cm), methyl orange (...

Embodiment 3

[0041] At room temperature, add 0.5g oxalic acid, 8.0g deionized water, 4g absolute ethanol and 2.5g PDMS to a 100mL single-necked flask, and magnetically stir for 120min to obtain a two-phase solution; take 16g absolute ethanol, 0.5g TTIP and 88mg of chloroplatinic acid solution was magnetically stirred and mixed in a 50mL beaker to obtain solution A, and then used a flow type peristaltic pump at 200μL·min -1 Slowly add solution A dropwise to the two-phase solution within 130min at a rate of 130min, stir and react for 23h, during -2 ) under light for 15 minutes; after the reaction, add 25g TEOS, continue to stir and react for 2 hours, and obtain a transparent and uniform sol, which is the Pt-TiO 2 -SiO 2 Photocatalytic self-cleaning composite material, marked PTS-3.

[0042] The product obtained in this embodiment is used for visible light catalytic degradation of methyl orange, and the results are as follows Figure 5 As shown, after 52h of visible light (8W×4, 15cm), met...

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Abstract

The invention belongs to the technical field of photocatalytic self-cleaning materials, and specifically relates to a Pt-TiO2-SiO2 photocatalytic self-cleaning composite material and a preparation method thereof. The preparation method comprises the following steps: subjecting a mixed solution of oxalic acid, water, absolute ethyl alcohol and hydroxyl-terminated polydimethylsiloxane and a mixed solution of isopropyl titanate, a chloroplatinic acid solution and absolute ethyl alcohol to mixing with tetraethyl silicate, and carrying out a one-step reaction under the irradiation of ultraviolet light so as to obtain a photocatalytic self-cleaning composite material. According to the invention, with the oxalic acid as a catalyst and a chelating agent, high-activity anatase phase titanium dioxide can be prepared without the need of calcination, and a uniform sol is obtained; with the hydroxy-terminated polydimethylsiloxane as an organic additive, an organic / inorganic composite system material with stable structure and strong hydrophobicity and self-cleaning ability is obtained; and by adoption of a photoreduction method, platinum ions can be reduced and loaded onto the surface of titanium dioxide. The preparation method provided by the invention is simple; and the composite material obtained by using the preparation method provided by the invention has the advantages of strong adhesion force, transparency, wide photoresponse range and high catalytic activity.

Description

technical field [0001] The invention belongs to the technical field of photocatalytic self-cleaning materials, in particular to a Pt-TiO 2 -SiO 2 Photocatalytic self-cleaning composite material and preparation method thereof. Background technique [0002] Photocatalytic self-cleaning materials refer to materials that have the functions of antifouling, antibacterial, etc. to keep themselves clean under the action of light. TiO 2 Due to its low price and high catalytic activity, it has important applications in the fields of high-end ceramics and building materials. Among them, in terms of building materials, TiO 2 The photocatalytic coating covers the exterior surface of the building, which makes the building itself self-cleaning. Specifically, TiO is obtained by hydrolysis and calcination 2 powder, then TiO 2 The powder is dispersed in water, or blended with acrylic polymer, or blended with titanium isopropoxide sol and applied to the surface of building materials. I...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D1/00C09D5/16B01J23/42
CPCB01J23/42B01J35/004C09D1/00C09D5/1618C09D5/1662
Inventor 王斌程菲黄月文文富彬刘海俊徐兵兵
Owner NANXIONG MATERIAL PRODION BASE OF CHINESE ACADEMY OF SCI GUANGZHOU CHEM
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