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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 recyclable floating composite photocatalytic ball and its preparation method and application. 2 Mix nano photocatalyst, absolute ethanol and NaOH aqueous solution, stir in a water bath until a stable adsorption equilibrium system is formed; then add dropwise the absolute ethanol solution with silver nitrate dissolved; then raise the water bath temperature to 75~85°C; cool the reaction solution Separate, then wash and vacuum dry; then perform a hydrothermal reaction with distilled water and a coupling agent, cool and add dropwise to the surface of the plexiglass hemisphere; after drying, the plexiglass hemisphere is bonded to obtain the recyclable floating composite Photocatalytic sphere. The preparation process of the invention is simple, and the prepared composite photocatalytic spheres can float in seawater and are recyclable, and can be used for visible light excitation to degrade organic pollutants in seawater.

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
CPCC02F1/30B01J23/50C02F2305/10C02F2101/345C02F2101/30B01J35/39B01J35/51
Inventor 王挺李冰蕊吴礼光丁知非
Owner ZHEJIANG GONGSHANG UNIVERSITY
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