Biological regulation preparation method of copper selenide nano-material

A nanomaterial and biological preparation technology, applied in the field of green technology, can solve the problems of high energy consumption, high cost, environmental pollution, etc., and achieve the effects of low energy consumption, good dispersion and low cost

Inactive Publication Date: 2015-09-16
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the invention is to solve the problems of high cost, high energy consumption and serious environmental pollution in the existing copper selenide material preparation method, and propose a method for biologically preparing copper selenide nanomaterials with selenite reducing bacteria (Pantoea agglomerans) method

Method used

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  • Biological regulation preparation method of copper selenide nano-material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Step 1. Screening and cultivation of selenite-reducing bacteria

[0036] 1. The composition of the enrichment medium for selenite-reducing bacteria is: 0.1mol / L lactic acid, 0.1mol / L Na 2 SeO 3 ,1.0g / L NH 4 Cl,0.5g / L KH 2 PO 4 ,0.5g / L MgSO 4 ,0.1g / L CaCl 2 ,0.5g / L yeast extract powder, pH 5.0;

[0037]2. The soil around Beijing was collected and air-dried and ground. The treated soil samples were put into the enrichment medium of selenite reducing bacteria and placed in anaerobic culture at 30°C. Transplant once every 20 days according to the volume ratio of 20% (seed solution / medium).

[0038] Step 2, the preparation of EDTA-Cu chelate solution

[0039] To prepare 0.1mol / L EDTA-Cu chelate solution, 0.05mol of CuSO 4 ·5H 2 O and 0.05mol of EDTA-Na 4 Dissolve in 500mL of distilled water, stand at room temperature for 4h before use.

[0040] Step 3, preparation of copper selenide nanomaterial

[0041] The composition of working medium for preparing copper se...

Embodiment 2

[0044] Step 1. Screening and cultivation of selenite-reducing bacteria

[0045] 1. The composition of the enrichment medium for selenite-reducing bacteria is: 0.1mol / L lactic acid, 0.1mol / L Na 2 SeO 3 ,1.0g / L NH 4 Cl,0.5g / L KH 2 PO 4 ,0.5g / L MgSO 4 ,0.1g / L CaCl 2 ,0.5g / L yeast extract powder, pH 5.0;

[0046] 2. The soil around Beijing was collected and air-dried and ground. The treated soil samples were put into the enrichment medium of selenite reducing bacteria and placed in anaerobic culture at 30°C. Transplant once every 20 days according to the volume ratio of 20% (seed solution / medium).

[0047] Step 2, the preparation of EDTA-Cu chelate solution

[0048] To prepare 0.1mol / L EDTA-Cu chelate solution, 0.05mol of CuSO 4 ·5H 2 O and 0.05mol of EDTA-Na 4 Dissolve in 500mL of distilled water, stand at room temperature for 4h before use.

[0049] Step 3, preparation of copper selenide nanomaterial

[0050] The composition of working medium for preparing copper s...

Embodiment 3

[0053] Step 1. Screening and cultivation of selenite-reducing bacteria

[0054] 1. The composition of the enrichment medium for selenite-reducing bacteria is: 0.1mol / L lactic acid, 0.1mol / L Na 2 SeO 3 ,1.0g / L NH 4 Cl,0.5g / L KH 2 PO 4 ,0.5g / L MgSO 4 ,0.1g / L CaCl 2 ,0.5g / L yeast extract powder, pH 5.0;

[0055] 2. The soil around Beijing was collected and air-dried and ground. The treated soil samples were put into the enrichment medium of selenite reducing bacteria and placed in anaerobic culture at 30°C. Transplant once every 20 days according to the volume ratio of 20% (seed solution / medium).

[0056] Step 2, the preparation of EDTA-Cu chelate solution

[0057] To prepare 0.1mol / L EDTA-Cu chelate solution, 0.05mol of CuSO 4 ·5H 2 O and 0.05mol of EDTA-Na 4 Dissolve in 500mL of distilled water, stand at room temperature for 4h before use.

[0058] Step 3, preparation of copper selenide nanomaterial

[0059] The composition of working medium for preparing copper s...

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Abstract

The invention relates to a method for preparing a copper selenide nano-material by using Pantoea agglomerans. The copper selenide nano-material with three different stoichiometric ratios is prepared by adjusting the amount of a chemical reducing agent NaBH4 in a solution. When a ratio of n(EDTA-Cu):n(NaBH4) in a working medium solution is not greater than 4-8:1, the product is a Cu2Se nanosphere, and belongs to a tetragonal system, the primary sediment size is 20nm, and the secondary sediment size is 50-100nm; when the ratio of n(EDTA-Cu):n(NaBH4) in a working medium solution is greater than 4-8:1, the product is a CuSe nanosphere, and belongs to a hexagonal system, and the particle size is 100-200nm; and when the solution does not contain NaBH4, the product is a Cu2-xSe nanosphere, and belongs to a cubic system, and the particle size is uniform and is about 80nm. The problems of high cost, large energy consumption and environmental pollution existing in present copper selenide preparation methods are solved in the invention.

Description

technical field [0001] The invention relates to a method for preparing copper selenide nanometer materials with three different stoichiometric ratios by utilizing selenite-reducing bacteria, which belongs to the field of green technology. Background technique [0002] Copper selenide is a semiconductor material with special photoelectric properties, which can be widely used in solar cells, superionic conductors, photoelectric converters, optical filters and other fields. Copper selenide has a variety of stoichiometric compositions (such as CuSe, Cu 2 Se, CuSe 2 、Cu 3 Se 2 、Cu 5 Se 4 、Cu 7 Se 4 etc.) and non-stoichiometric composition (Cu 2-x Se), mainly exists in various forms such as monoclinic, cubic, tetragonal, and hexagonal. The traditional methods for preparing copper selenide nanomaterials are mainly physical and chemical methods, including hydrothermal method, solvothermal method, thermal decomposition method, chemical bath deposition method, sprayin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P3/00C12R1/01
Inventor 辛宝平岳蕾王佳张永涛祁诗月
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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