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Nitrogen-doped biochar-loaded palladium catalyst as well as preparation method and application thereof

A technology of palladium catalyst and biological carbon, which is applied in the field of biotechnology to prepare nanomaterials to achieve excellent biocompatibility and improve application effect.

Inactive Publication Date: 2021-12-07
ZHENJIANG COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Unfortunately, there are still no relevant reports on the simultaneous enhancement of microbial adsorption and reduction processes and the application of high-value products.

Method used

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  • Nitrogen-doped biochar-loaded palladium catalyst as well as preparation method and application thereof
  • Nitrogen-doped biochar-loaded palladium catalyst as well as preparation method and application thereof
  • Nitrogen-doped biochar-loaded palladium catalyst as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Cultivation of Shewanella.oneidensis MR-1 (Shewanella): This method uses Shewanella.oneidensis MR-1 as a microbial strain for synthesizing nitrogen-doped bio-carbon-supported palladium catalysts. The strain uses Luria-Bertani Medium, the formulation of the medium: sodium chloride 10g / L, tryptone 10g / L, yeast extract 5g / L, and finally adjust the pH value to neutral with sodium hydroxide. Before using the culture medium, sterilize it in an autoclave at 121°C for 20 minutes; take the Shewanella. In Taichung, 400 L of bacterial liquid was inoculated into 100 mL of fresh Luria-Bertani culture medium, and the culture medium inoculated with the strain was placed in a shaker at 28 °C and 180 r / min for 15 hours to obtain the optimal growth state of the bacterial liquid.

[0034] (2) The preparation method of Shewanella.oneidensis MR-1@PDA: Add dopamine powder to 20mL Tris-HCl buffer solution after high temperature sterilization, control the final concentration of dopamine to...

Embodiment 2

[0041] (1) The cultivation of Shewanella.oneidensis MR-1: the method is to adopt Shewanella.oneidensisMR-1 as a microbial strain for synthesizing nitrogen-doped bio-carbon-supported palladium catalyst, which adopts Luria-Bertani medium, and the medium The formula: sodium chloride 10g / L, tryptone 10g / L, yeast extract 5g / L, and finally adjust the pH value to neutral with sodium hydroxide. Before using the culture medium, use an autoclave to sterilize it at 121°C for 20 minutes; take the Shewanella.oneidensis MR-1 preserved with glycerol out of the -75°C refrigerator, and inoculate with 400L of bacterial liquid in a clean bench Into 100mL of fresh Luria-Bertani culture medium, place the culture medium inoculated with the strain at 28°C and 180r / min shaker for 15 hours to obtain the optimum growth condition of the culture medium.

[0042] (2) The preparation method of Shewanella.oneidensis MR-1@PDA: add dopamine powder to 20mL Tris-HCl buffer solution after high temperature steril...

Embodiment 3

[0050] Application of the doped bio-carbon supported palladium catalyst prepared in Example 2: at room temperature, add 4-nitrophenol (2.5mL, 0.1mM) and freshly prepared sodium borohydride (250L, 0.1M) in a quartz cuvette Solution, nitrogen-doped bio-carbon-supported palladium catalyst 3mg, every 2 minutes, use ultraviolet light to detect the change of the absorption peak of the solution. The maximum absorption wavelength of 4-nitrophenol is at 317nm. However, when sodium borohydride is added, 4-nitrophenol will exist in the aqueous solution in the form of ions, which makes its maximum wavelength shift to 400nm. As the reaction proceeds, the absorption peak at 400 nm disappears, the reactants are converted completely, and the solution changes from yellow to colorless and transparent. However, a new absorption peak appeared at 300 nm, indicating the formation of 4-aminophenol.

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Abstract

The invention discloses a nitrogen-doped biochar-loaded palladium catalyst as well as a preparation method and application thereof, and the method comprises the following steps: modifying amino on the surface of shewanella through PDA and adsorbing Pd (II), and carbonizing to obtain the nitrogen-doped biochar-loaded palladium catalyst. Compared with the prior art, the catalyst has the following advantages: (1) the surface of shewanella is modified by in-situ polymerization of PDA, the PDA has excellent biocompatibility, and the structure contains a large amount of phenolic hydroxyl groups and nitrogen-containing groups which have strong adsorbability to Pd (II); in addition, PDA has weak reducibility, and part of Pd (II) can be reduced into nano particles; What's more important is that shewanella is living cells, and the metabolic activity of shewanella can effectively reduce Pd (II), so that synchronous reinforcement of an adsorption process and a reduction process is realized; and (2) the biologically recovered Shewanella.oneidensis MR-1 (at) PDA (at) Pd is calcined, and PDA contains rich amino groups, so that the nitrogen element is doped in the carbon material in the calcining process, and the application effect is further improved.

Description

technical field [0001] The invention belongs to the technical field of preparing nanomaterials by biotechnology, and relates to a functional nanomaterial catalyst, specifically a nitrogen-doped biological carbon-supported palladium catalyst and a preparation method and application thereof. Background technique [0002] The microbial recovery of secondary resources of precious metals is mainly to use bacteria, fungi, algae and other bioleaching or biosorption of precious metals to realize the recovery of secondary resources of precious metals. Due to the mild conditions and no need for high temperature and high pressure or the introduction of highly toxic and highly polluting chemical reagents, it has attracted more and more attention. In recent years, breakthroughs have been made in the research on the recovery of Pd metal based on microorganisms: the recovery process includes two steps of biosorption and bioreduction, which comprehensively determine the recovery efficiency ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24C07C213/02C07C215/76
CPCB01J27/24C07C213/02C07C215/76
Inventor 刘想郭东雪马嘉艳
Owner ZHENJIANG COLLEGE