Method for preparing nano silver and titanium dioxide thin films on surfaces of hollow glass beads

A technology of hollow glass microspheres and nano-titanium dioxide, applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, chemical/physical processes, etc., can solve problems such as industrial production difficulties and complex production processes

Active Publication Date: 2013-04-03
JIAXING HENENG TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing modification methods for hollow glass microspheres mainly include the use of sol-gel and precipitation methods to coat a layer of anatase nano-titanium dioxide particles on the surface of hollow glass microspheres, b

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Take 5 g of hollow glass microspheres, add them to 1 L of degreasing liquid, react at a temperature of 80 ° C for 40 min, filter and wash with water. The degreased hollow glass microspheres were immersed in 1 L of hydrofluoric acid solution with a mass concentration of 2%, reacted at 40 °C for 1 h, filtered, washed with water, and dried at 80 °C for 1 h. Prepare silver ammonia solution according to silver nitrate 2g / L, sodium hydroxide 2g / L, tartaric acid 1g / L and potassium hydroxide 2g / L, and prepare according to glucose 4g / L, potassium sodium tartrate 2g / L and absolute ethanol 50ml / L reducing solution. Add the roughened hollow glass microspheres to the silver-ammonia solution, stir mechanically for 10 minutes, then slowly add the silver-ammonia solution to the reducing solution, stir while adding, and carry out ultrasonic oscillation plating under the condition of frequency 28KHz and power 300W Reaction, after the plating is completed, filter out the hollow glass mic...

Embodiment 2

[0027] Take 10 g of hollow glass microspheres, add them to 1 L of degreasing liquid, react at a temperature of 100 ° C for 60 min, filter and wash with water. Immerse the degreased hollow glass microspheres in 1 L of hydrofluoric acid solution with a mass concentration of 4%, react at 60°C for 2h, filter, wash with water, and dry at 80°C for 2h. Prepare silver ammonia solution according to silver nitrate 8g / L, sodium hydroxide 4g / L, tartaric acid 2g / L and potassium hydroxide 6g / L, and prepare according to glucose 10g / L, potassium sodium tartrate 6g / L and absolute ethanol 100ml / L reducing solution. Add the roughened hollow glass microspheres to the silver-ammonia solution, stir mechanically for 30 minutes, then slowly add the silver-ammonia solution to the reducing solution, stir while adding, and carry out ultrasonic oscillation plating under the condition of frequency 28KHz and power 300W Reaction, after the plating is completed, the hollow glass microspheres are filtered ou...

Embodiment 3

[0029]Take 8 g of hollow glass microspheres, add them to 1 L of degreasing liquid, react at a temperature of 90° C. for 50 min, then filter and wash with water. The deoiled hollow glass microspheres were immersed in 1 L of hydrofluoric acid solution with a mass concentration of 3%, reacted at 50°C for 1.5h, filtered, washed with water, and dried at 80°C for 1.5h. Prepare silver ammonia solution according to silver nitrate 6g / L, sodium hydroxide 3g / L, tartaric acid 1.5g / L and potassium hydroxide 4g / L, according to glucose 7g / L, potassium sodium tartrate 4g / L and absolute ethanol 60ml / L Prepare a reducing solution. Add the roughened hollow glass microspheres to the silver-ammonia solution, mechanically stir for 40 minutes, then slowly add the silver-ammonia solution to the reducing solution, stir while adding, and carry out ultrasonic oscillation plating under the condition of frequency 28KHz and power 300W Reaction, after the plating is completed, filter out the hollow glass m...

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Abstract

The invention discloses a method for preparing nano silver and titanium dioxide thin films on the surfaces of hollow glass beads, which comprises the following steps of: I, firstly coating a nano silver thin film on the surface of a hollow glass bead by using a chemical plating method; and II, then directly coating a layer of nano titanium dioxide thin film on the surface of the hollow glass bead coated with the nano silver thin film by using a hydrothermal method. The method disclosed by the invention has the advantages of raw material saving, simplicity and convenience in operation, good binding strength, higher photocatalytic activity and the like, and endows hollow glass beads with a photocatalytic degradation property for dyes and organic pollutants.

Description

technical field [0001] The invention belongs to the technical field of functional inorganic non-metallic materials, and relates to a method for modifying hollow glass microspheres, specifically a method of firstly coating the surface of hollow glass microspheres with a nano-silver layer by using an electroless plating method, and then using A modification method for coating anatase nano-titanium dioxide film by hydrothermal method. Background technique [0002] Nano-titanium dioxide has antibacterial, anti-ultraviolet, photocatalytic and self-cleaning effects, and is widely used in solar cells, cosmetics, functional fibers, coatings and fine ceramics. Compared with rutile-type titanium dioxide, anatase nano-titanium dioxide has higher reflectivity in the short-wavelength part of visible light, with a bluish tint, relatively lower absorption capacity for ultraviolet rays, and higher photocatalytic activity. At present, the preparation methods of nano titanium dioxide mainly ...

Claims

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Application Information

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IPC IPC(8): B01J23/50A62D3/176A62D101/28
Inventor 詹建朝张辉
Owner JIAXING HENENG TECH CO LTD
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