Preparation method of silver nano prism for improving capability of titanium dioxide in photocatalytic degradation of organic pollutants in wastewater

A technology of organic pollutants and titanium dioxide, applied in water pollutants, catalyst activation/preparation, oxidized water/sewage treatment, etc., can solve problems such as low photocatalytic efficiency

Inactive Publication Date: 2020-06-16
TIANJIN UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a method for modifying titanium dioxide by using silver nanoprisms for the low photocatalytic efficiency of existing titanium dioxide. In order to solve the above problems, the technical scheme of the present invention is as follows:

Method used

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  • Preparation method of silver nano prism for improving capability of titanium dioxide in photocatalytic degradation of organic pollutants in wastewater
  • Preparation method of silver nano prism for improving capability of titanium dioxide in photocatalytic degradation of organic pollutants in wastewater
  • Preparation method of silver nano prism for improving capability of titanium dioxide in photocatalytic degradation of organic pollutants in wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] (1) prepare the methylene blue solution of mass fraction 0.001%, the titanium dioxide solution of mass fraction 0.2%,

[0011] (2) Take 1mL of the silver nanoprism solution with a clean disposable plastic dropper, put it in a small transparent glass bottle, then add 1mL of titanium dioxide solution, oscillate and shake well, cover the bottle cap, and seal it with a parafilm , put them into a beaker filled with distilled water, put the beaker into an ultrasonic cleaner, and take it out after ultrasonic mixing for 30 minutes.

[0012] (3) Set No. bottle "1" of the blank control group without catalyst, add 4mL methylene blue solution, 2mL ultrapure water in the bottle; set No. "2" bottle of the control group without silver solution, add 4mL methylene blue solution, 1mL titanium dioxide in the bottle solution and 1mL of ultrapure water, the "3" bottle of the experimental group was taken out in (2), and then added 4mL of methylene blue solution, and stood in the dark for 1h ...

Embodiment 2

[0022] Other reaction parameters are consistent with the operation steps. Change the initial concentration of the methylene blue solution, expand the mass fraction by ten times, prepare a methylene blue solution with a mass fraction of 0.01%, or reduce it by ten times, prepare a methylene blue solution with a mass fraction of 0.0001%, and compare the initial concentration of the methylene blue solution. The influence of different concentrations on the photocatalytic efficiency of titanium dioxide modified with silver nanoprisms. In actual production, the concentration of organic matter in wastewater is either high or low. Photocatalysts have different photocatalytic effects on wastewater with different concentrations of organic matter. degradation effect.

Embodiment 3

[0024] Other reaction parameters are consistent with the operating steps, changing the mass fraction of titanium dioxide, the nano-titanium dioxide used in the photocatalytic experiment is commercial Degussa P25 titanium dioxide, which is a mixed phase of anatase crystal and rutile crystal with an average particle size of 25 nanometers Titanium dioxide is a nano-scale white powder, and the hydroxyl groups on the surface make it hydrophilic.

[0025] Double the mass fraction to prepare a titanium dioxide solution with a mass fraction of 0.4%, or double the size to prepare a titanium dioxide solution with a mass fraction of 0.1%. Compared with the different mass fractions of titanium dioxide, the impact on the photocatalytic efficiency of titanium dioxide modified by silver nanoprisms In actual production, different dosages of photocatalysts have different photodegradation effects on organic matter in wastewater.

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Abstract

The invention provides a chemical reduction synthesis method for preparing a silver nano prism. The prepared silver nano prism solution is ultrasonically mixed with a titanium dioxide solution to obtain a modified photocatalyst, namely a silver nano prism and titanium dioxide nano complex, the modified photocatalyst is used for degrading methylene blue in water, and compared with titanium dioxidephotocatalysis, the degradation efficiency is greatly improved.

Description

technical field [0001] The invention relates to a silver nanoprism capable of improving the ability of titanium dioxide to photocatalytically degrade organic pollutants in waste water, and belongs to the field of chemical synthesis. Background technique [0002] The current application of silver nanoprisms is mainly reflected in the fields of biology and medical engineering. This is because of the sharp triangular tip shape and tunable plasmon bands. Silver nanoprisms have strong antibacterial effects on many kinds of microorganisms and can Significantly reduce bacterial infection, so it can inhibit or even kill a variety of viruses, bacteria and fungi. Silver nanoprism is a silver nanoparticle with a tip structure. Because of the local surface plasmon resonance effect (LSPR), it has a unique optical properties. The principle of titanium dioxide photocatalysis is that after receiving a certain energy of light, the electrons on the valence band are excited and transition to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/50B01J21/06B01J37/16C02F1/72C02F1/30C02F101/38
CPCB01J21/063B01J23/50B01J35/004B01J37/16C02F1/725C02F2101/308C02F2101/38C02F2305/10
Inventor 韦会鸽夏一杰崔大鹏
Owner TIANJIN UNIV OF SCI & TECH
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