A recyclable floating composite photocatalytic ball and its preparation method and application

A technology of composite photocatalysis and composite light, which is applied in the field of photocatalytic oxidation and degradation of pollutants, can solve the problems of effective degradation and floating of difficult pollutants, and achieve the effect of high degradation efficiency, low cost and good stability

Active Publication Date: 2019-12-24
ZHEJIANG GONGSHANG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, these photocatalysts are not only difficult to float in the seawater system without external force, but also difficult to achieve effective degradation of pollutants under the excitation of visible light.

Method used

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  • A recyclable floating composite photocatalytic ball and its preparation method and application
  • A recyclable floating composite photocatalytic ball and its preparation method and application
  • A recyclable floating composite photocatalytic ball and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] (1) Preparation of visible light-responsive nano-photocatalytic active components

[0064] Take 1.0gTiO 2 (P25), 200mL absolute ethanol and 1.5mL NaOH aqueous solution (concentration: 5g / L) were placed in a flask, stirred and adsorbed in a water bath at 30°C. After adsorption equilibrium (more than 12 hours), TiO 2 (P25) The surface forms a stable OH-rich - the adsorbed water layer.

[0065] Take another 50 mL of absolute ethanol dissolved with 0.02 g of silver nitrate, and drop it into the adsorption equilibrium system drop by drop using a constant pressure funnel. Silver nitrate will diffuse into the adsorbed water layer, and OH - The ions undergo a precipitation decomposition reaction, and the TiO 2 (P25) Ag nanoparticles formed in the surface adsorption layer. After the reaction was completed (5 hours), the temperature of the water bath was raised to 80°C, and the 2 The suspension system of (P25)-Ag composite particles was aged and heat-treated for 1 hour. A...

Embodiment 2

[0085] (1) Catalyst preparation

[0086] Take 1.0g TiO 2 (P25), 200mL absolute ethanol and 1.5mL NaOH aqueous solution (concentration: 10g / L) were placed in a flask, stirred and adsorbed in a 30°C water bath. After adsorption equilibrium (more than 12 hours), TiO 2 (P25) The surface forms a stable OH-rich - the adsorbed water layer.

[0087] Take another 50 mL of absolute ethanol dissolved with 0.04 g of silver nitrate, and drop it into the adsorption equilibrium system drop by drop using a constant pressure funnel. Silver nitrate will diffuse into the adsorbed water layer, and OH - The ions undergo a precipitation decomposition reaction, and the TiO 2 (P25) Ag nanoparticles formed in the surface adsorption layer. After the reaction was completed (5 hours), the temperature of the water bath was raised to 80°C, and the 2 The suspension system of (P25)-Ag composite particles was aged and heat-treated for 1 hour. After the reaction system is cooled to room temperature aft...

Embodiment 3

[0107] (1) Catalyst preparation

[0108] Take 1.0g TiO 2 (P25), 200mL absolute ethanol and 1.5mL NaOH aqueous solution (concentration: 15g / L) were placed in a flask, stirred and adsorbed in a 30°C water bath. After adsorption equilibrium (more than 12 hours), TiO 2 (P25) The surface forms a stable OH-rich - the adsorbed water layer.

[0109] Take another 50 mL of absolute ethanol dissolved with 0.06 g of silver nitrate, and drop it into the adsorption equilibrium system drop by drop using a constant pressure funnel. Silver nitrate will diffuse into the adsorbed water layer, and OH - The ions undergo a precipitation decomposition reaction, and the TiO 2 (P25) Ag nanoparticles formed in the surface adsorption layer. After the reaction was completed (5 hours), the temperature of the water bath was raised to 80°C, and the 2 The suspension system of (P25)-Ag composite particles was aged and heat-treated for 1 hour. After the reaction system is cooled to room temperature aft...

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Abstract

The invention discloses a recoverable floating type composite photocatalytic sphere as well as a preparation method and application thereof. The preparation method comprises the following steps: mixing TiO2 nanometer photocatalyst, absolute ethyl alcohol and a NaOH aqueous solution, and stirring in a water bath until a stable adsorption equilibrium system is formed; then dropwise adding an absolute ethyl alcohol solution dissolved with silver nitrate; raising the temperature of the water bath to 75 to 85 DEG C; cooling and separating reaction liquid, then washing and carrying out vacuum drying treatment; carrying out hydrothermal reaction on the reaction liquid with distilled water and a coupling agent, cooling and then dropwise adding a mixed solution on the surface of polymethylmethacrylate hemispheres; drying and then bonding the polymethylmethacrylate hemispheres, thus obtaining the recoverable floating type composite photocatalytic sphere. The preparation process disclosed by the invention is simple; the prepared composite photocatalytic sphere can float in seawater and can be recycled, and is applied to degradation of organic pollutants in the seawater by visible light excitation.

Description

technical field [0001] The invention relates to the preparation of a composite photocatalyst responding to visible light and the field of photocatalytic oxidation and degradation of pollutants in a saline wastewater system, in particular to a method for preparing a recyclable floating composite photocatalytic ball applied to visible light excitation to degrade organic pollutants in seawater . Background technique [0002] With the rapid development of global industry and economy, new environmental problems that need to be faced are emerging in an endless stream. Due to the continuous discharge of industrial and agricultural wastewater on land and the increasing demand for shipping, the problem of organic pollution in the marine system has gradually become an important factor restricting my country's economic development. The treatment of organic pollutants in the marine system needs to overcome the interference of salt ions first. The seawater system is a water system with ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/50B01J35/08C02F1/30C02F101/34C02F101/30
CPCB01J23/50B01J35/004B01J35/08C02F1/30C02F2101/30C02F2101/345C02F2305/10
Inventor 王挺李冰蕊吴礼光丁知非
Owner ZHEJIANG GONGSHANG UNIVERSITY
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