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tio 2 Preparation method of /mns composite photocatalytic spraying agent

A technology of composite photocatalysis and spraying agent, which is 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 the two components are uniformly distributed, and the formation speed is different Larger issues

Active Publication Date: 2017-12-15
浙江和谐光催化科技有限公司
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  • 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] Adopt concentrated nitric acid (mass fraction is 65%) as hydrolysis buffering agent, concentrated nitric acid is added dropwise in the titanium isopropoxide until the pH value of mixed solution is equal to 2; Add water dropwise 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 40°C. After the water addition is completed, continue to stir for 0.5 hours to obtain flocs; the flocs are centrifuged Machine separation and washing more than three times, and the obtained reactant 1 was sealed for future use. Another 15g of manganese acetate was dissolved in 100mL of purified water at 90°C, and after cooling, TAA was slowly added while stirring until the molar ratio Mn:S=1:2. Most of the generated manganese sulfide became a reddish-brown precipitate and settled at the bottom of the vessel. The red product was filtered out and washed with ethanol, ether and purifi...

Embodiment 2

[0025] Adopt concentrated nitric acid (mass fraction is 65%) as hydrolysis buffering agent, concentrated nitric acid is added dropwise in titanium butoxide until the pH value of mixed solution is lower than 2; Add water dropwise 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 addition of water is completed, continue to stir for 1.05 hours to obtain flocs; the flocs are centrifuged Machine separation and washing more than three times, and the obtained reactant 1 was sealed for future use. Another 12g of manganese nitrate was dissolved in 100mL of purified water at 30°C, and 50ml of acetic acid was added. Slowly add TAA while stirring until the molar ratio Mn:S=1:1.6. The product was filtered off and washed sequentially with ethanol, diethyl ether and purified water to obtain reactant 2. Mix reactant 1 and reactant 2 at a ratio of 30:1 (molar ...

Embodiment 3

[0027] Identical to embodiment 1 step and parameter preparation TiO 2 / MnS composite photocatalytic spraying agent, this spraying machine is coated on the enamel surface, then test its degrading organic matter ability by the method of embodiment 1 and test its photo-induced hydrophilicity by the method of embodiment 2, the result shows that on the enamel surface The photodegradation time is 25 minutes, and the water contact angle after light is 3°.

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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 kind of TiO 2 The invention relates to a preparation method of a / MnS composite photocatalytic spraying agent, which 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 photocatalytic active coatings in recent years. But due to TiO 2 Narrow light absorption range (only absorbs ultraviolet rays with a wavelength shorter than 360nm) and low photon quantum efficiency (generally less than 6%), so pure TiO 2 Coatings are rare. Self-cleaning coating products are mostly designed as one or more semiconductors and TiO 2 In order to expand the light absorption range of the paint and improve the pollutant degradation performance of the paint. Composite coatings, non-TiO 2 Some almost all use oxides (including compound oxides, su...

Claims

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Application Information

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Patent Type & Authority Patents(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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