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Method for controllably synthesizing bismuth-based nano-material by directly electrolyzing metal bismuth

A technology of nano-materials and metals, which is applied in the field of controlled synthesis of bismuth-based nano-materials from metal bismuth by direct electrolysis, to achieve the effects of increasing bismuth content, cheap and easy-to-obtain raw materials, and simple operation

Active Publication Date: 2010-09-08
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are few reports on the controlled electrolytic synthesis of nano-bismuth compounds directly from metal bismuth.

Method used

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  • Method for controllably synthesizing bismuth-based nano-material by directly electrolyzing metal bismuth
  • Method for controllably synthesizing bismuth-based nano-material by directly electrolyzing metal bismuth
  • Method for controllably synthesizing bismuth-based nano-material by directly electrolyzing metal bismuth

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Take 0.05 mol of commercially available analytical pure NaCl and 0.02 mol of commercially available analytically pure EDTA in a beaker, add 100 ml of distilled water to stir and dissolve, and further adjust the pH to 8 with an aqueous NaOH solution prepared with commercially available analytically pure NaOH. Connect to a DC power supply, use metal bismuth as the anode to corrode the electrode, pass through the DC current, the voltage is 10V, and electrolyze for 2 hours, and the spongy metal bismuth is precipitated at the cathode. The black spongy metallic bismuth is taken out, add 20ml distilled water, stir strongly 20min, filter, dry, obtain 0.4472g black powder, this powder is passed through SEM (such as figure 2 shown), XRD (as image 3 Shown) analysis, this black powder is Bi nano sheet.

Embodiment 2

[0027] In the electrolyte of case 1, continue to add dropwise NaOH aqueous solution prepared with commercially available analytical pure NaOH to adjust PH=10, connect to a DC power supply, use metal bismuth as an anode to corrode the electrode, connect DC with a voltage of 10V, and electrolyze for 4 hours. A large amount of pale yellow precipitate appeared. This pale yellow precipitate was taken out and washed with 20ml distilled water, filtered, dried to obtain 0.8651g yellow powder, this powder was passed through SEM (as Figure 6 shown), XRD (as Figure 7 Shown) analysis, the yellow powder is Bi 24 o 31 Cl 10 Nano powder.

Embodiment 3

[0029] Continue to add dropwise 5mol / L NaOH aqueous solution prepared with commercially available analytical pure NaOH to the electrolyte of Case 2 to adjust the pH to 13, connect to a DC power supply, use metal bismuth as the anode to corrode the electrode, connect DC with a voltage of 10V, and electrolyze for 2 hours , a large amount of yellow precipitate appeared in the solution. This yellow precipitate was taken out and washed with 20ml distilled water, filtered, and dried to obtain 0.4211g yellow powder, which was passed through SEM (as Figure 8 shown), XRD (as Figure 9 Shown) analysis, the yellow powder is Bi 2 o 2.33 Nanosheets.

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Abstract

The invention discloses a method for controllably synthesizing a bismuth-based nano-material by directly electrolyzing metal bismuth. In the electrolysis process of the method, metal bismuth serves as a sacrificial anode, mixed aqueous solution of sodium chloride, disodium ethylene diamine tetraacetic acid and sodium hydroxide serves as electrolyte, direct current is electrified for electrolyzing, and the proportion of electrolyte components is adjusted so as to prepare the bismuth-base nano-material. The method has the advantages of cheap and ready available raw materials used in the preparing process, controllable batch production of nano-grade high-purity Bi, BiOCl, Bi24O31CL10 or Bi2O2.33, reusable electrolyte, high compatibility with the environment.

Description

technical field [0001] The invention relates to a method for synthesizing bismuth-based nanomaterials, in particular to a method for synthesizing bismuth-based nanomaterials through direct electrolysis and control of metal bismuth. Background technique [0002] The unique surface effect, small size effect, quantum effect, macroscopic quantum tunneling effect and dielectric confinement effect of nanomaterials make nanomaterials not only have macroscopic material properties, but also have excellent physical and chemical properties. attention. As an important doping material, bismuth has unique advantages in optics, magnetism, and electricity. Among them, hexagonal bismuth is a potential good thermoelectric material at room temperature. Theoretical studies have predicted that nanobismuth has more excellent thermoelectric properties; nanobismuth oxychloride exhibits excellent performance in catalytic oxidation, inorganic pigments, and photoluminescence. ; Bismuth oxide is curr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B1/00C25C5/02C01G29/00
Inventor 陈光房国丽王雄刘金强
Owner NANJING UNIV OF SCI & TECH
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