Biological palladium catalyst and preparation method and application thereof

A palladium catalyst and biological technology, which is applied in the field of environmental microbial materials and pollutant degradation, can solve the problems of uneven particle size, small specific surface area, and high requirements for instruments and equipment, and achieve good catalytic performance, good chemical stability, and preparation method simple effect

Inactive Publication Date: 2017-08-04
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional preparation methods of precious metal palladium nanoparticles include physical and chemical methods. The products obtained by physical methods are of high quality, but require high equipment and expensive production costs, and the ability to control the shape of precious metal palladium nanoparticles is limited.
Chemical methods are flexible and diverse, and can be used to prepare noble metal nanoparticles with various shapes, but most chemical methods require the introduction of more chemical reagents, which may cause certain environmental pollution problems
[0003] Because palladium has good chemical stability and catalytic ability, it has great advantages in catalytic environmental pollutants, but the existing palladium catalysts have uneven particle size, small specific surface area, and catalytic activity needs to be improved.

Method used

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  • Biological palladium catalyst and preparation method and application thereof
  • Biological palladium catalyst and preparation method and application thereof
  • Biological palladium catalyst and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] After culturing Enterococcus faecalis in LB medium for 2-3 days, collect them by centrifugation (at 20°C, at 8000 rpm for 5 min), wash them with deionized water for 3 times, and then use deionized water to make a bacterial suspension (1.2-3.6 g·L -1 ); take 10 mL of bacterial suspension into the volumetric flask, add sodium tetrachloropalladate solution, adjust the pH to 3, add electron donor sodium formate solution, and set the volume to 50 mL, so that the final concentration of sodium tetrachloropalladate is 50 mg L -1 ~250mg·L -1 , the electron donor concentration is 5~30mmol·L -1 ; Put it into a constant temperature oscillator at 20-60°C for 48 hours and then centrifuge (at 25°C, centrifuge at 8000rpm for 6min) to collect, and wash with deionized water for 2-4 times; after ultrasonic crushing for 30min, centrifuge (at 25°C, Centrifuge at 8000 rpm for 6 min), wash 3 times, and dry at 60° C. for 6 hours to obtain nano-palladium.

[0035] Investigate the relationshi...

Embodiment 2

[0044] Take 10mL of 1.2g·L -1 Enterococcus faecalis bacterial suspension is placed in the volumetric flask, adds sodium tetrachloropalladate solution, adjusts pH to be 3, adds electron donor sodium formate solution, is settled to 50mL, makes the concentration of final sodium tetrachloropalladate be 210mg. L -1 , the concentration of sodium formate is 25mmol L -1 ; put it in a constant temperature oscillator at 40°C for 48 hours, collect it by centrifugation, wash it with deionized water for 2-4 times, and ultrasonically break it for 30 minutes (add deionized water to 20-30mL of Palladium-containing Enterococcus faecalis after cleaning, and use ultrasonic power 120W, the ultrasonic working time is 5s, and the interval time is 5s), centrifuged and washed 3 to 5 times, and dried at 50°C for 10 hours to obtain nano-palladium. The TEM figure (transmission electron microscope) of the nano-palladium (nano-palladium prepared by biological method) prepared by the present embodiment i...

Embodiment 3

[0048] Select a 100mL centrifuge tube as the reaction vessel, weigh 0.1000g of the catalyst prepared in Example 2 (nano palladium prepared by a biological method, i.e. bio-palladium) and add it to 50mL of 5mg / L 2,3,4'-trichlorobiphenyl solution, adjust the pH to be neutral, put it into an ultrasonic scrubber (180W) and dissolve for 2min; add sodium formate (10-30mmol L -1 ) as an electron donor, and finally reacted at room temperature in a constant temperature oscillator. In the control group, no catalyst was added, and three parallel experiments were performed in each group. The samples were filtered through a 0.5 μm needle filter and then extracted by 5 mL for gas chromatography and ion chromatography. The curve graph of the concentration of 2,3,4'-trichlorobiphenyl in the reaction solution changing with the catalytic time is as follows Figure 7 As shown, it can be found that 2,3,4'-trichlorobiphenyl can be completely removed after 48h. The curve graph of the amount (conc...

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Abstract

The invention belongs to the technical field of environmental microorganism materials, and discloses a biological palladium catalyst, a preparation method and application thereof. The preparation method comprises the following steps: (1) cultivating enterococcus faecalis till being in stable stage, then filtering, collecting, cleaning and preparing a bacterium suspension; and (2) adding the bacterium suspension to a palladium precursor solution, adjusting pH, and adding an electron donor solution; and putting into a thermostatic oscillator for cultivation, carrying out ultrasonication, cleaning and drying to obtain the nanosized palladium. The preparation method has the beneficial effects that the preparation method is simple, other chemical reagents do not need to be introduced, and the catalyst prepared by the method has uniform particle size and a good catalytic performance and can be used for catalytic degradation of halogen-containing organic pollutants.

Description

technical field [0001] The invention belongs to the technical field of environmental microbial materials and pollutant degradation, and in particular relates to a biological palladium catalyst, a preparation method thereof and an application in the degradation of environmental pollutants. Background technique [0002] With the continuous combination of nanotechnology and precious metal deep processing technology, the application range of nanomaterials of precious metal palladium is constantly expanding, especially in the field of chemical catalysis, which plays an irreplaceable role. Traditional preparation methods of noble metal palladium nanoparticles include physical and chemical methods. The products obtained by physical methods are of high quality, but require high equipment and expensive production costs, and the ability to control the shape of noble metal palladium nanoparticles is limited. Chemical methods are flexible and can be used to prepare noble metal nanoparti...

Claims

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Application Information

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IPC IPC(8): B01J23/44
CPCB01J23/44A62D2101/22
Inventor 朱能武康乃馨石超宏吴平霄
Owner SOUTH CHINA UNIV OF TECH
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