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Modified TiO2 coating and preparation method thereof

A modification and coating technology, applied in the field of preparation of inorganic binder and precious metal modified titanium dioxide, can solve problems such as poor stability and weak bonding, achieve strong adhesion and thermal stability, low cost and economical , the effect of improving utilization

Active Publication Date: 2014-08-13
SHANGHAI MASTECK ENVIRONMENTAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to TiO 2 In view of the shortcomings of weak bonding and poor stability exposed by catalysts in practical applications, an inorganic binder and noble metal modified TiO 2 The preparation method, the TiO prepared after modification by this method 2 It can not only give full play to the photocatalytic activity, but also improve the bonding strength and thermal stability of the catalyst on the surface of the carrier, make up for the defects, and realize better recycling of the catalyst

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0028] Modified TiO of the present invention 2 The preparation method of catalyst comprises the following steps:

[0029] (1) Preparation of inorganic binder aluminum dihydrogen phosphate: using phosphoric acid-aluminum hydroxide liquid phase reaction method, the main reaction formula is Al(OH) 3 +3H 3 PO 4 →Al(H 2 PO 4 ) 3 +3H 2 O. The specific operation steps are: add the mixture of aluminum hydroxide and water into the reaction kettle, stir and heat to 90~100°C, then add stoichiometric phosphoric acid solution (to ensure that the molar ratio of phosphoric acid / aluminum hydroxide is 3.0:1), React for 1 hour to obtain a translucent thick material, put it in an electric furnace at 300°C while it is still hot, continue to heat and condense for 10 hours, then hydrate, dry at 120°C, and pulverize to obtain a white powdery product of aluminum dihydrogen phosphate.

[0030] Weigh 30g of aluminum dihydrogen phosphate and dissolve it in 100mL of deionized water, stir and mix ...

Embodiment 1

[0039] (1) Preparation of inorganic binder aluminum dihydrogen phosphate: adopt the phosphoric acid-aluminum hydroxide liquid phase reaction method, that is, add the mixture of aluminum hydroxide and water into the reaction kettle, stir and heat to 90~100°C, and then add stoichiometric Phosphoric acid solution (to ensure that the molar ratio of phosphoric acid / aluminum hydroxide is 3.0:1), react for 1 hour to obtain a translucent thick material, put it in a 300°C electric furnace while it is hot, continue to heat and condense for 10 hours, and then hydrate it. Dry at 120°C and pulverize to obtain a white powder product of aluminum dihydrogen phosphate. Weigh 30g of aluminum dihydrogen phosphate and dissolve it in 100mL of deionized water, mix well, transfer to a dry silicon tetrafluoride plastic bottle for storage, and set aside.

[0040] (2) Preparation of noble metal Pt-modified titanium dioxide solution: take 1 mL of 193.08 mmol / L chloroplatinic acid solution, 180 mL of abs...

Embodiment 2

[0044] In order to examine the effect of the addition of Pt on the inorganic binder and noble metal modified TiO 2 The impact of the catalytic activity of the catalyst, control the amount of chloroplatinic acid solution added so that the Pt content is respectively P25-TiO 2 Modified TiO was prepared at 0%, 0.5%, 1.0%, 1.5%, 2.0%, 2.5% of the dosage 2 sol, and prepared TiO by the immersion-pulling method 2 The coating film, except that the Pt content is different, other conditions are all the same as the experimental conditions of Example 1. The experimental results of photocatalytic oxidative decomposition of methylene blue show that: when P25-TiO 2 When the Pt content in the catalyst is 0% and 0.5%, respectively, the modified TiO 2 Compared with the unmodified one, the catalytic activity is almost not improved. When the addition of Pt is 0%, the modified TiO 2 The catalytic activity did not decrease, which indicated that the addition of the inorganic binder aluminum dihyd...

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Abstract

The invention discloses a modified TiO2 coating and a preparation method thereof. The modified TiO2 coating comprises the following components in parts by weight: 60 to 100 parts of deionized water, 5 to 30 parts of titanium dioxide and 10 to 20 parts of an inorganic binder, as well as a nanometer precious metal solution, wherein the nanometer precious metal solution contains 3 wt% to 5wt% of nanometer precious metal and accounts for 0.01% to 3% of the weight of titanium dioxide based on nanometer precious metal; the inorganic binder is selected from any one of alkali metal silicates, aluminosilicate, phosphate or silicon dioxide sol. According to the modified TiO2 coating and the preparation method thereof, TiO2 is modified through the inorganic binder and the precious metal, the modified TiO2 film coating can be firmly bound on the surface of a carrier, and thus high stability is ensured, the catalyzing activity of TiO2 is improved, and a TiO2 catalyst can be recycled well; in addition, the preparation process is simple, the cost is low, the yield can reach 100%, and industrial mass production can be carried out easily.

Description

technical field [0001] The invention relates to a preparation method of inorganic binder and noble metal modified titanium dioxide. TiO prepared by this method 2 thin film coating without affecting the TiO 2 Under the premise of high photocatalytic activity, it also has better thermal stability and recyclability, which can degrade various volatile organic compounds and help people efficiently treat various organic waste gases. Background technique [0002] In recent years, with the background of energy utilization and environmental protection, the research on photocatalytic degradation of organic pollutants is very active, which is called Advanced Oxidation Process (AOP) abroad. The use of semiconductor heterogeneous photocatalysis to control environmental pollution is a new technology that has been paid more and more attention in recent years. It has great potential in wastewater and waste gas purification treatment. Hoffmann and Mills et al. made a detailed review report...

Claims

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Application Information

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IPC IPC(8): B01J27/185B01J23/42
Inventor 何冰黄健翔李云玲
Owner SHANGHAI MASTECK ENVIRONMENTAL
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