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Method for preparing nano-metallic film on surface of liquid phase and application of method in recovery of metal in wastewater

A technology of nano metal film and nano metal particles, applied in the field of nano materials, can solve the problems of high resin price and large dosage, and achieve the effects of convenient method, simple operation and avoidance of sintering

Inactive Publication Date: 2014-09-17
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the resin is expensive, and the amount of medicine used for regeneration is large

Method used

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  • Method for preparing nano-metallic film on surface of liquid phase and application of method in recovery of metal in wastewater
  • Method for preparing nano-metallic film on surface of liquid phase and application of method in recovery of metal in wastewater
  • Method for preparing nano-metallic film on surface of liquid phase and application of method in recovery of metal in wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Chlorauric acid (HAuCl 4 ) solution and PVP solution are mixed in the reaction vessel with chloroauric acid: PVP=1:100mol / g, place between two electrode plates of the plasma, airtight, the vacuum chamber is evacuated, then filled with argon for discharge The gas is maintained at a pressure of 200Pa, an AC voltage of 500V is applied to the electrode, and the plasma is reduced by glow discharge, the plasma temperature is 50°C, and the reduction time is 30s. The sample forms a layer of nano gold film on the surface of the liquid phase. The film takes on different colors when the incident light hits it from different angles. It is confirmed by transmission electron microscopy that the particle size is 10-30nm, and the nano-gold thin film can be used in the fields of optics and catalysis.

[0038] The prepared nano-gold film is analyzed by X-ray diffraction and scanning electron microscope, and the following analysis results can be obtained:

[0039] Such as figure 1 As ...

Embodiment 2

[0042] silver nitrate (AgNO 3 ) solution and the PVP solution are mixed in the reaction vessel with silver nitrate: PVP=1:667mol / g, then placed between the two electrode plates of the plasma discharger, airtight, the vacuum chamber is evacuated, and then filled with argon As discharge gas, maintain a pressure of 200Pa, apply an AC voltage of 500V on the electrode, and use glow discharge plasma to reduce silver nitrate (AgNO 3 ), the temperature of the plasma is 40° C., the reduction time is 3 min, and a nano-silver thin film floating on the surface of the liquid phase is prepared. When the incident light shines from different angles, it will show different colors. It is confirmed by transmission electron microscopy that the particle size is 3-20nm, and the nano-silver thin film can be applied to the fields of optics and catalysis.

[0043] Such as image 3 The actual photos of the experimental results are shown. From the figure, it can be clearly seen that there is a thin fil...

Embodiment 3

[0047] Chlorauric acid (HAuCl 4 ) and the same concentration of copper sulfate (CuSO 4 ) mixed solution and PVP solution are mixed with chloroauric acid: PVP=1:500mol / g in reaction container, then place between two electrode plates of plasma, airtight, vacuum chamber is evacuated, then fills with argon As a discharge gas, maintain a pressure of 200Pa, apply an AC voltage of 500V to the electrodes, and use glow discharge plasma for reduction. The plasma temperature is 50°C and the reduction time is 6 minutes. It is confirmed by X-ray diffraction that the thin film obtained by reduction is a thin film of gold, and copper ions are not reduced. The remaining liquid was tested by ICP. After one glow process, the remaining gold ion concentration was 0.00111mol / L, and the copper ion concentration was 0.001473mol / L. Part of the copper element adheres to the film in the form of ions, and can be eluted with water and returned to the mother liquor. After multiple glow processes, gold ...

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Abstract

The invention relates to a method for preparing a nano-metallic film on the surface of a liquid phase and application of the method in recovery of metal in wastewater. According to the method and the application thereof, the rapid preparation of the nano-metallic film on the surface of the liquid phase is realized by using a cold plasma technology; the time for a plasma preparation process does not exceed 10 minutes, and other chemical reagents are not added except for a surfactant; the aims of preparation and separation are achieved by the simple and environmental-friendly plasma technology; nano-metallic particles are embedded in the surfactant, so as to form the nano-metallic film, and the particle size of the nano-metallic particles and agglomerates thereof is 2-100nm; metal ions, of which the standard electrode potential is higher than zero, in wastewater easily obtain electrons and then are easily reduced, and metal ions, of which the standard electrode potential is negative, in the wastewater continuously stay in the wastewater in an ionic form, so that the separation and recovery of related metals are realized very easily. The method has the advantages of simple employed devices, low energy consumption and environmental friendliness, and is convenient to operate.

Description

technical field [0001] The invention relates to the technical field of nanometer materials, in particular to a method for rapidly preparing a nanometer metal film material on a liquid phase surface and its application in metal recovery from waste water. Background technique [0002] Nanomaterials refer to materials with at least one dimension in the nanoscale range (1-1000nm) or composed of them as basic units in three-dimensional space, which is approximately equivalent to the scale of 10-100 atoms closely arranged together. Nanoparticles and nanoparticle aggregates are typical mesoscopic systems, which have surface effects, small size effects, and macroscopic quantum tunneling effects. When people subdivide macroscopic objects into ultrafine particles (nanoscale), it will show many strange properties, that is, its optical, thermal, electrical, magnetic, mechanical and chemical properties are compared with those of macroscopic solids. will be significantly different. Ther...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C18/31B82Y30/00B82Y40/00C22B7/00C02F1/30C02F1/70C02F101/20
CPCY02P10/20
Inventor 刘昌俊李敏悦郭秋婷孙启迪王宗元
Owner TIANJIN UNIV
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