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Zinc oxide/zinc sulfide composite film photoelectrode and solar photodeposition precious metal recovery device

A technology of zinc oxide thin film and composite thin film, applied in the direction of zinc oxide/zinc hydroxide, zinc sulfide, electrodes, etc., can solve the problem of no precious metals being found, achieve environmental friendliness, promote separation and migration, excellent photocatalytic activity and stability sexual effect

Pending Publication Date: 2021-10-08
LIAONING UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Moreover, in the recently reported research, there are photodeposited Pt, Au and their loading on TiO 2 Nanoparticle surfaces for enhancing their photoelectrochemical performance, meanwhile, no reports have been found on the use of photodeposition to collect precious metals

Method used

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  • Zinc oxide/zinc sulfide composite film photoelectrode and solar photodeposition precious metal recovery device
  • Zinc oxide/zinc sulfide composite film photoelectrode and solar photodeposition precious metal recovery device
  • Zinc oxide/zinc sulfide composite film photoelectrode and solar photodeposition precious metal recovery device

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Experimental program
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Embodiment 1

[0037] Embodiment 1 A kind of zinc oxide / zinc sulfide composite film photoelectrode

[0038] (1) preparation method comprises the steps:

[0039] 1) Preparation of zinc oxide thin film seed layer: including the following steps: dissolving zinc nitrate hexahydrate in ethanol and ultrasonically dissolving it fully to obtain a zinc nitrate ethanol solution with a concentration of 0.005M. Add 0.8mL of the prepared ethanol solution of zinc nitrate dropwise on the surface of the blank FTO, and dry it in a vacuum oven at 70°C. This process is repeated three times, and then transferred to a muffle furnace for sintering at a high temperature of 450°C for 15 minutes, and naturally cooled to room temperature to obtain ZnO seed layer. Dissolve 0.1M zinc nitrate hexahydrate and 0.2M hexamethylenetetramine in 50mL of deionized water, and ultrasonically dissolve them fully. Finally, transfer the mixed solution and the FTO containing the ZnO seed layer to a polytetrafluoroethylene-lined rea...

Embodiment 2

[0044] Embodiment 2 A recovery device utilizing solar photoinduced deposition of precious metals

[0045] Such as Figure 4 As shown, the structure of a recovery device for an H-type electrolytic cell that directly utilizes solar photoinduced deposition of precious metals is as follows: a zinc oxide / zinc sulfide composite film electrode based on FTO conductive glass is used as a photoelectrode, a blank FTO conductive glass is used as a counter electrode, and the electrolyte They are respectively 0.02% chloroplatinic acid, 0.02% chloroauric acid, and 0.02% silver nitrate solution with a mass fraction of 0.02%, and simulated sunlight (500W xenon lamp as light source, AM 1.5 type filter, incident light intensity is 100mW) / cm 2 ) under. Figure 4 On the right is a picture of Au, Ag, Pt thin films photo-deposited on the surface of FTO.

[0046] 1) Scanning electron microscope test and XRD test of photodeposited Au film

[0047] Such as Figure 5 As shown, the gold based on so...

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Abstract

The invention relates to the technical field of photodeposition and photocatalysis, in particular to a zinc oxide / zinc sulfide composite film photoelectrode and a solar photodeposition precious metal recovery device. A preparation method of the zinc oxide / zinc sulfide composite film photoelectrode comprises the following steps of ultrasonically cleaning conductive glass by acetone, ethanol and water in sequence, and drying to remove redundant water on the surface; preparing a zinc oxide film through a hydrothermal reaction; after secondary hydrothermal treatment, generating a ZnO / ZIF-8 precursor in situ; and vulcanizing the ZnO / ZIF-8 precursor into ZnO / ZnS, and obtaining the zinc oxide / zinc sulfide composite film photoelectrode. The ZnO / ZnS composite film photoelectrode and blank conductive glass are assembled by utilizing an H-shaped electrolytic bath to obtain the solar photodeposition precious metal recovery device. The deposition device can deposit Au, Ag and Pt noble metals from a solution by directly utilizing solar energy.

Description

technical field [0001] The invention relates to the technical field of photodeposition and photocatalysis, in particular to a zinc oxide / zinc sulfide composite film photoelectrode and a recovery device for solar photodeposition precious metals. Background technique [0002] With the excessive consumption of resources, environmental problems have become increasingly prominent, especially the sustainable recovery and utilization of precious metal resources has become an urgent problem to be solved. Precious metal resources are scarce, and mineral resources are non-renewable resources, especially gold and silver industrial reserves are relatively small. At present, the recycling process of most rare and precious metals in my country is complicated, the recycling cost is high, and a virtuous cycle system for recycling has not yet been established. Effective recycling of rare and precious metals in the above-mentioned wastes can not only reduce the consumption of metal resources...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C7/02C25C1/20C25C7/00C01G9/02C01G9/08
CPCC25C7/02C25C1/20C25C7/00C01G9/02C01G9/08Y02P10/20
Inventor 张宇卜德刚马天翼李硕宋溪明
Owner LIAONING UNIVERSITY
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