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Biological regulation preparation method of lead sulfide nanomaterial

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, simple operation and low cost

Active Publication Date: 2016-01-20
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 propose a method for biologically preparing lead sulfide nanomaterials with sulfate-reducing bacteria (SRB, Clostridiaceaesp.)

Method used

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  • Biological regulation preparation method of lead sulfide nanomaterial
  • Biological regulation preparation method of lead sulfide nanomaterial
  • Biological regulation preparation method of lead sulfide nanomaterial

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Step 1. Screening and cultivation of SRB

[0037] 1. The composition of the rich medium of SRB is: 0.1mol / L lactic acid, 8.0g / LNa 2 SO 4 ,1.0g / LNH 4 Cl,0.5g / LKH 2 PO 4 ,0.5g / LMgSO 4 ,0.1g / LCaCl 2 ,0.5g / L yeast extract powder, pH5.0;

[0038] 2. Collect sludge from a sewage treatment plant in Beijing. The sludge samples were placed in SRB enriched medium and placed in anaerobic culture at 32°C. Transplant once every 20 days according to the volume ratio of 20% (seed solution / medium).

[0039] Step 2, the preparation of EDTA-Pb chelate solution

[0040] Preparation of 0.1mol / LEDTA-Pb chelate solution is to contain 0.05mol of Pb 2+ of wastewater and 0.1mol of EDTA-Na 4 Mix and stand at room temperature for 6h before use.

[0041] Step 3, the preparation of lead sulfide nanomaterial

[0042] The composition of the working medium for preparing lead sulfide is: 5.0g / L glucose, 8.0g / LNa 2 SO 4 ,1.0g / LNH 4 Cl,0.5g / LKH 2 PO 4 ,0.5g / LMgSO 4 ,0.1g / LCaCl 2 , 0.5g / ...

Embodiment 2

[0045] Step 1. Screening and cultivation of SRB

[0046] 1. The composition of the rich medium of SRB is: 0.1mol / L lactic acid, 8.0g / LNa 2 SO 4 ,1.0g / LNH 4 Cl,0.5g / LKH 2 PO 4 ,0.5g / LMgSO 4 ,0.1g / LCaCl 2 ,0.5g / L yeast extract powder, pH5.0;

[0047] 2. Collect sludge from a sewage treatment plant in Beijing. The sludge samples were placed in SRB enriched medium and placed in anaerobic culture at 32°C. Transplant once every 20 days according to the volume ratio of 20% (seed solution / medium).

[0048] Step 2, the preparation of EDTA-Pb chelate solution

[0049] Preparation of 0.1mol / LEDTA-Pb chelate solution is to contain 0.05mol of Pb 2+ of wastewater and 0.1mol of EDTA-Na 4 Mix and stand at room temperature for 6h before use.

[0050] Step 3, the preparation of lead sulfide nanomaterial

[0051] The composition of the working medium for preparing lead sulfide is: 5.0g / L glucose, 8.0g / LNa 2 SO 4 ,1.0g / LNH 4 Cl,0.5g / LKH 2 PO 4 ,0.5g / LMgSO 4 ,0.1g / LCaCl 2 , 0.5...

Embodiment 3

[0054] Step 1. Screening and cultivation of SRB

[0055] 1. The composition of the rich medium of SRB is: 0.1mol / L lactic acid, 8.0g / LNa 2 SO 4 ,1.0g / LNH 4 Cl,0.5g / LKH 2 PO 4 ,0.5g / LMgSO 4 ,0.1g / LCaCl 2 ,0.5g / L yeast extract powder, pH5.0;

[0056] 2. Collect sludge from a sewage treatment plant in Beijing. The sludge samples were placed in SRB enriched medium and placed in anaerobic culture at 32°C. Transplant once every 20 days according to the volume ratio of 20% (seed solution / medium).

[0057] Step 2, the preparation of EDTA-Pb chelate solution

[0058] Preparation of 0.1mol / LEDTA-Pb chelate solution is to contain 0.05mol of Pb 2+ of wastewater and 0.1mol of EDTA-Na 4 Mix and stand at room temperature for 6h before use.

[0059] Step 3, the preparation of lead sulfide nanomaterial

[0060] The composition of the working medium for preparing lead sulfide is: 5.0g / L glucose, 8.0g / LNa 2 SO 4 ,1.0g / LNH 4 Cl,0.5g / LKH 2 PO 4 ,0.5g / LMgSO 4 ,0.1g / LCaCl 2 , 0.5...

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Abstract

The invention relates to a method for preparing a lead sulfide nanomaterial by utilizing SRB (sulfate reducing bacteria) Clostridiaceae sp.. Three cubic crystal system lead sulfide nanomaterials with different morphologies are prepared by adjusting the quantity of dispersants PEG 2000 (polyethylene glycol 2000) in a solution. A lead source adopts high-concentration lead containing wastewater; when 1-4 mM of PEG 2000 is added, a product is PbS nanorods, and the size of crystal grains is 50*50*100 nm; when 9-12 mM of PEG 2000 is added, a product is PbS nanosheets, and the thickness of the crystal sheets is about 10 nm; when 17-20 mM of PEG 2000 is added, a product is PbS nanoparticles, and the diameters of the particles are about 60 nm. The problems of high cost, high energy consumption, poor environment friendliness and the like of an existing lead sulfide material preparation method are solved, a new regulation method is proposed, that is, non-toxic polymeric dispersants are added to a single-phase system to control the morphology of the nanoparticles. The lead source is the high-concentration lead-containing wastewater, and meanwhile, a green thought is provided for resource utilization of the wastewater.

Description

technical field [0001] The invention relates to a method for preparing three kinds of lead sulfide nanomaterials with different shapes by using sulfate-reducing bacteria, which belongs to the field of green technology. Background technique [0002] Lead sulfide is an important IV-VI semiconductor material, which has a particularly small band gap (0.41eV) and a large excitonic Bohr radius (18nm) at room temperature, and has special optical and electrical properties. Some high-tech fields such as linear optical materials and photoelectric conversion materials have shown potential application prospects. In addition, lead sulfide nanomaterials have good photosensitivity in the near-infrared band (1-3 μm), and are often used to make near-infrared photoconductive detectors. Therefore, the preparation and research of lead sulfide nanomaterials with different morphologies have always been a subject of concern. Traditional methods for preparing lead sulfide nanomaterials are mainly...

Claims

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Application Information

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IPC IPC(8): C01G21/21B82Y40/00
CPCC01G21/21C01P2002/72C01P2002/85C01P2004/03C01P2004/64
Inventor 辛宝平王佳岳蕾张永涛祁诗月
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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