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A biological method for preparing p-ferrite-modified n-hematite heterostructures

A technology of heterostructure, hematite, applied in the field of inorganic materials

Inactive Publication Date: 2017-07-04
XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] It is difficult to avoid the surface defects caused by high temperature annealing by traditional physical or chemical methods, therefore, new research focuses on the preparation and biosynthesis of the nanomaterials

Method used

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  • A biological method for preparing p-ferrite-modified n-hematite heterostructures
  • A biological method for preparing p-ferrite-modified n-hematite heterostructures
  • A biological method for preparing p-ferrite-modified n-hematite heterostructures

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] a. The massage ratio is Mg 2+ : Zn 2+ : Fe 3+ =0.5:0.5:2 Weigh the raw material MgCl 2 , ZnCl 2 And FeCl 3 ·6H 2 O, add an aqueous solution of nitric acid with a pH of 2, and reflux for 2 hours at a temperature of 85°C. The reactants will undergo peptization and reflux reaction, and the solution will change from colorless and transparent to an earthy yellow suspension. The reaction is over in 2 hours. After standing still Solid-liquid stratification to obtain a yellowish powder product. After washing the powder with water to remove the by-product ammonium chloride, it is dried at a vacuum temperature of 50°C for 20 hours to obtain Mg 2+ And Zn 2+ Modified FeOOH powder;

[0017] b. 30g·L -1 Shewanella putrefaciens MR-1 was cultured in liquid tryptone soy broth medium to obtain a cell concentration of 2.3×10 8 Cell·ml -1 , The Shewanella putrefaction MR-1 strain was centrifuged under the freezing condition at a temperature of 5℃, and the Shewanella putrefaction MR-1 strain was...

Embodiment 2

[0020] a. The massage ratio is Mn 2+ : Zn 2+ : Fe 3+ =0.5:0.5:2 Weigh the raw material MnCl 2 , ZnCl 2 And FeCl 3 ·6H 2 O, added to nitric acid aqueous solution with pH 2, peptized and refluxed for 2 hours at a temperature of 85°C, the solution changed from colorless and transparent to light yellow suspension, the reaction was completed in 2 hours, solid-liquid separation after standing, vacuum Dry for 20 hours at 50℃ to obtain brownish yellow Mn 2+ -Zn 2+ Modified FeOOH powder;

[0021] b. 30g·L -1 Shewanella putrefaciens MR-1 was cultured in liquid tryptone soy broth medium to obtain a cell concentration of 2.3×10 8 Cell·ml -1 , The Shewanella putrefaction MR-1 strain was centrifuged under the freezing condition at a temperature of 5℃, and the Shewanella putrefaction MR-1 strain was added to the mineralization medium as (NH 4 ) 2 SO 4 9.0mM, K 2 HPO 4 5.7mM, KH 2 PO 4 3.3mM, NaHCO 3 2.0mM, MgSO 4 ·7H 2 O 1.01mM,CaCl 2 ·2H 2 O0.485mM, sodium ferric ethylenediaminetetraacetate ...

Embodiment 3

[0024] a. The massage ratio is Ni 2+ : Zn 2+ : Fe 3+ =0.5:0.5:2 Weigh the raw material NiCl 2 , ZnCl 2 And FeCl 3 ·6H 2 O, added to nitric acid aqueous solution with pH 2, refluxed for 2 hours at a temperature of 85°C, the solution changed from colorless and transparent to light yellow-green suspension. After standing, the solid-liquid layer was separated and dried at 50°C under vacuum for 20 hours to obtain Light yellow Ni 2+ -Zn 2+ Modified FeOOH powder;

[0025] 30g·L -1 Shewanella putrefaciens MR-1 was cultured in liquid tryptone soy broth medium to obtain a cell concentration of 2.3×10 8 Cell·ml -1 , The Shewanella putrefaction MR-1 strain was centrifuged under the freezing condition at a temperature of 5℃, and the Shewanella putrefaction MR-1 strain was added to the mineralization medium as (NH 4 ) 2 SO 4 9.0mM, K 2 HPO 4 5.7mM, KH 2 PO 4 3.3mM, NaHCO 3 2.0mM, MgSO 4 ·7H 2 O 1.01mM,CaCl 2 ·2H 2 O0.485mM, sodium ferric ethylenediaminetetraacetate 67.2μM, H 3 BO 3 56.6μM, N...

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Abstract

The invention relates to a biological method of preparing a p-ferrite-modified n-hematite heterostructure by virtue of shewanella putrefaciens MR-1. According to the method, a p type ferrite-n type hematite heterostructure of a p-n junction and an ohmic layer is developed through a biosynthesis technology, and the method is carried out in two steps, step 1, preparing A-Zn (A is Mg, Mn or Ni)-modified goethite (FeOOH) powder with a particle size of about 50nm by virtue of a peptize reflux technology; and step 2, curing shewanella putrefaciens MR-1 under a room-temperature anaerobic condition and reducing a part of ferric iron to obtain a (A-Zn)Fe2O4-Fe2O3 heterojunction. Compared with the prior art, the method has the advantages of being simple in process, less in pollution, low in energy consumption, easy to enlarge, high in recovery rate and the like; the (A-Zn)Fe2O4-Fe2O3 heterojunction obtained through the method is low in surface defects, low in agglomeration, uniform in particle size, and good in optical, thermal and magnetic characteristics.

Description

Technical field [0001] The invention relates to a biological method for preparing p-ferrite to modify the heterostructure of n-hematite by using Shewanella putrefaction MR-1, and belongs to the field of inorganic materials. Background technique [0002] n-type semiconductor hematite (Fe 2 O 3 ; Band gap: 2eV) is an important semiconductor material in the field of catalysts, which has been applied to photoelectric materials, photocatalysis and magnetic storage media. However, the carrier mobility is poor (0.2cm 2 ·V -1 ·S -1 ) And the ultra-fast recombination of photogenerated carriers (~10ps) and other defects restrict its large-scale promotion. Currently researching surface design and preparation of controllable Fe 2 O 3 The base heterostructure can significantly improve the efficiency of photo-generated electrons and holes, and new properties that the physical mixing of the original components do not have appear. For example, using Fe 2 O 3 With p-type spinel ferrite (band gap...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C12P3/00C12R1/185
Inventor 边亮徐金宝董海良董发勤宋绵新侯文平李海龙王磊常爱民
Owner XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI