Preparation method of TiO2/MnS composite photocatalytic coating agent

A technology of composite photocatalysis and spraying agent, applied in the direction of physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problem that the product is difficult to form MnS high dispersion and two components are evenly distributed, and the formation speed is different Larger issues

Active Publication Date: 2015-12-30
浙江和谐光催化科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it can be seen from the two documents reported above that its photocatalyst is not compatible with TiO 2 Composite, and the photocatalyst is prepared by hydrothermal synthesis; due to TiO 2 The type of precursor and its formation speed of MnS are quite different. If the same process (including temperature, pressure, time and medium, etc.) It is formed successively, so it is difficult for the final product to form the desired MnS high dispersion and two-component uniform distribution state

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Using concentrated nitric acid (mass fraction of 65%) as the hydrolysis buffer, the concentrated nitric acid is gradually added dropwise to the titanium isopropoxide until the pH value of the mixed solution is equal to 2; then add 2-5 drops per minute to the above mixed solution Add water at a high speed to decompose the titanium salt; the volume ratio of water and the mixed solution is controlled at 1:15, and the hydrolysis temperature is controlled at 40°C. After the dripping is completed, continue to stir for 0.5 hours to obtain floccules; centrifuge the flocculent substances The machine is separated and washed more than three times, and the obtained reactant 1 is sealed for use. Another 15 g of manganese acetate was dissolved in 100 mL of purified water at 90°C, and TAA was slowly added while stirring after cooling until the molar ratio Mn:S=1:2. Most of the generated manganese sulfide becomes a reddish brown precipitate and sinks to the bottom of the vessel. The red...

Embodiment 2

[0025] Using concentrated nitric acid (mass fraction of 65%) as the hydrolysis buffer, the concentrated nitric acid is gradually added dropwise to the titanium butoxide until the pH value of the mixed solution is lower than 2; then add 2-5 drops per minute to the above mixed solution Add water at a high speed to hydrolyze the titanium salt; the volume ratio of water and the mixed solution is controlled at 1:15, and the hydrolysis temperature is controlled at 25°C. After the dripping is completed, continue to stir for 1.05 hours to obtain floccules; centrifuge the flocculent substances The machine is separated and washed more than three times, and the obtained reactant 1 is sealed for use. Another 12g of manganese nitrate was dissolved in 100ml of purified water at 30°C, and 50ml of acetic acid was added. Add TAA slowly while stirring until the molar ratio Mn:S=1:1.6. The product was filtered and washed with ethanol, ether and purified water in order to obtain reactant 2. Mix ...

Embodiment 3

[0027] Prepare TiO with the same steps and parameters as in Example 1 2 / MnS composite photocatalytic spraying agent, this spraying machine was coated on the enamel surface, and then tested its ability to degrade organic matter according to the method of Example 1 and its photo-hydrophilicity was tested according to the method of Example 2. The results showed that the enamel surface The photodegradation time was 25 minutes, and the water contact angle after light was 3°.

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PUM

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Abstract

A preparation method of a TiO2 / MnS composite photocatalytic coating agent comprises the steps that titanium containing salt, manganese containing salt and thioacetamide are selected as raw materials; concentrated nitric acid is adopted as a hydrolysis buffering agent and drop-added to a titanium salt precursor, namely, the titanium containing salt, until the pH value of the mixture solution is equal to or lower than 2; then water is drop-added so as to hydrolyze titanium salt; TiO2 floccule is obtained after water is drop-added and the mixture is stirred for 0.5-1.5 h; the manganese containing salt is mixed with water, the thioacetamide is taken as a sulfur source, the reaction temperature is controlled in the range from 50 DEG C to 70 DEG C, and MnS floccule is obtained after the mixture is stirred and reacted for 0.5-1.5 h; the TiO2 / MnS composite photocatalytic coating agent is obtained after the TiO2 floccule and the MnS floccule are centrifugalized, cleaned for three time, mixed and stirred for 2-28 hours. The preparation method of the TiO2 / MnS composite photocatalytic coating agent has the advantages that MnS and TiO2 are fully composited, and high dispersion and uniform distribution state are realized.

Description

Technical field [0001] The present invention relates to a TiO 2 The preparation method of / MnS composite photocatalytic spraying agent belongs to the technical field of photocatalytic material preparation. Background technique [0002] TiO 2 It has excellent physical and chemical properties such as cheap, non-toxic, and high stability, and has been widely used in the preparation of coatings with photocatalytic activity in recent years. But due to TiO 2 The light absorption range is narrow (only the ultraviolet light with a wavelength shorter than 360nm is absorbed) and the light quantum efficiency is low (generally less than 6%), so pure TiO 2 The paint is rare. Self-cleaning coating products are mostly designed as one or more semiconductors and TiO 2 In order to extend the light absorption range of the coating and improve the performance of the coating to degrade pollutants. In composite coatings, non-TiO 2 Some almost all use oxides (including compound oxides, such as In-Zn-O,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/04
Inventor 陈纳新刘平单兴刚
Owner 浙江和谐光催化科技有限公司
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