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Photoinduced degradation of anionic dyes by nano-gold-lithium niobate composites

A technology of anionic dyes and composite materials, applied in the field of light-induced direct oxidation degradation of anionic dye wastewater

Active Publication Date: 2022-04-22
CHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The existing methods for treating dye wastewater mainly include: physical adsorption method, chemical methods such as coagulation, oxidation, electrolysis, and biological method; however, there are relatively few studies on the direct oxidation and degradation of dye wastewater induced by light

Method used

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  • Photoinduced degradation of anionic dyes by nano-gold-lithium niobate composites
  • Photoinduced degradation of anionic dyes by nano-gold-lithium niobate composites
  • Photoinduced degradation of anionic dyes by nano-gold-lithium niobate composites

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Experimental program
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Effect test

Embodiment 1

[0027] A method for photo-induced degradation of anionic dyes by nano-gold-lithium niobate composite material is carried out in the following steps:

[0028] Step 1, preparing nano gold-lithium niobate composite material;

[0029] The lithium niobate substrate includes three layers, which are sequentially from top to bottom: a lithium niobate single crystal film layer with a thickness of 800nm ​​(+Z facing upward), an ITO layer with a thickness of 100nm, and a niobate layer with a thickness of 0.3mm. Lithium substrate. The above lithium niobate single crystal thin film layer and lithium niobate substrate are both 5mm*5mm lithium niobate ferroelectric single crystal slices cut perpendicular to the c-axis crystal axis, and the uppermost 800nm ​​thick lithium niobate single crystal thin film layer (+Z Face up) is a sample layer for depositing nano-gold, the surface flatness of its +Z surface is optical level, and its ferroelectric domain is a single domain structure parallel to ...

Embodiment 2

[0034] Take the composite material prepared in Step 1 of Example 1 as the experimental sample, at a place 15mm above the +Z surface of the composite material, with a wavelength of 1000-1700nm and a light intensity of 50mW / cm 2 The near-infrared light continuously irradiates the composite material at a vertical angle, and selects a certain gold nanosheet as a fixed detection object. The surface potential of the +Z surface of the composite material, the result is as image 3 shown.

[0035] from image 3 It can be seen that before near-infrared light irradiation (0 min), the surface potentials of the +Z surface of the nano-gold and lithium niobate substrates are basically the same, and as the near-infrared light irradiation time increases, the surface potential of the nano-gold gradually increases (higher than The surface potential of lithium niobate+Z surface), indicating that the positive charges on the surface of gold nanoparticles are significantly aggregated.

[0036] Th...

Embodiment 3

[0038] Cut 2 pieces of lithium niobate substrates of the same specification. The size of the lithium niobate substrate is 10mm*10mm*0.3mm. The lithium niobate substrate has a single domain structure parallel to the c-axis crystal axis.

[0039] Control group: a lithium niobate substrate was used to directly degrade the methyl orange solution;

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Abstract

The present invention disclosed a method of lithium nanometer lithium tadpate composite material light -induced degradation and degradation of yin -lying dyes. First of all, prepare nano -golden lithium cricket composite materials;The single -domain structure parallel to the C -axis shaft, attached to the+Z surface of the lithium cricket base with nano -gold; and then attached the nano -gold lithium cricket composite material with nano gold.In the solution, the nano -gold lithium cricket composite material is applied to the infrared light, and the anion dye adsorbed on the surface of the nanometer is oxidized and degraded.The significant effect of using the present invention is to radiate near -infrared light from the infrared light of nanometer lithium crickets, so that nanometer to produce surface plasma resonance effects, and electrons move from nano -gold to lithium lithium alcohol base.The charge can fully adsorb the yin -type dye such as methyl orange and achieve a new method of degrading organic matter dyes.

Description

technical field [0001] The invention relates to a photocatalytic treatment method for organic dye wastewater, in particular to a light-induced direct oxidation degradation method for anionic dye wastewater. Background technique [0002] Noble metal nanoparticles (such as Au, Ag, Cu) have attracted great attention and been widely used in the fields of surface-enhanced spectroscopy, optoelectronic devices, biological / chemical sensors, and catalysis because of their unique surface plasmon resonance (SPR) properties. Lithium niobate crystal is a representative ferroelectric material. Due to its good ferroelectric polarization and photoelectric performance, it has been widely used as a functional substrate material in the synthesis and self-assembly of nanomaterials. Using lithium niobate as the substrate, the size and density distribution of nanomaterials synthesized on the surface of the lithium niobate substrate can be controlled by controlling the concentration of the solutio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/30B01J23/68C02F103/38
CPCC02F1/30B01J35/004B01J23/682C02F2103/38
Inventor 刘晓燕司东辉贾碧张均范保艳邢安
Owner CHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY