Nano-copper array cathode for reductive degradation of organic pollutants as well as preparation and application thereof

A technology of organic pollutants and nano-copper, applied in water pollutants, water/sewage treatment, water/sludge/sewage treatment, etc. Problems such as being too scattered, achieving the effect of being suitable for large-scale production, compact arrangement, and reducing production costs

Inactive Publication Date: 2017-10-13

TSINGHUA UNIV

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AI-Extracted Technical Summary

Problems solved by technology

Patent CN101250725A discloses a method for preparing copper octahedral nanoparticles uniformly distributed in a large area. The surface of nano-copper prepared by this method is evenly distributed and has good dispersion; The problem of increased strength and reduced plasticity, but both technologies are based on two-dimensional flat substrate materials, and the loaded nano-copper particles are too dispersed or too dense, resulting in low utilizatio...

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Method used

By embodiment 1, embodiment 2, embodiment 3 and comparative example 1 result as can be known, the degradation efficiency of the prepared nano-copper array negative electrode of embodiment 1 to trichlorethylene has improved 22.4% than the degradation efficiency in comparative example 1 %, while the degradation efficiency of the nano-copper array cathodes prepared in Example 2 and Example 3 only increased by...

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Abstract

The invention provides a nano-copper array cathode for reductive degradation of organic pollutants as well as preparation and application thereof. Under a condition of lower cathode constant electric potential, through one-step electrodeposition, nano-copper arrays are loaded on surfaces of substrate materials such as three-dimensional foam copper, the obtained nano-copper sheet arrays are uniformly distributed, tightly arranged and difficult to fall off; the dimension length of the nano-copper sheet is less than 500nm, the width is less than 100nm and the thickness is less than 10nm; the prepared nano-copper array cathode is applied to organic pollution water treatment, precious metal palladium with high price is replaced, so that the manufacturing cost of an electrode is greatly reduced while the degradation efficiency of the organic pollutants is improved at the same time. According to the nano-copper array cathode disclosed by the invention, the process is simple, raw materials are low in cost and easy to obtain, and the possibility is provided for magnification scale production.

Application Domain

Water contaminantsWater/sewage treatment

Technology Topic

ChemistryPrecious metal +11

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Examples

Experimental program(3)
Comparison scheme(1)

Example Embodiment

[0037] Example 1:

[0038] (1) Take 6×2.5cm 2 Foam copper, ultrasonically immersed in acetone for 15 minutes, cleaned in ultrapure water, then immersed in 1% sulfuric acid ultrasonically for 15 minutes, cleaned in ultrapure water, and dried;

[0039] (2) Take 250 mL of electrolyte in a 260 mL electrolytic cell, use step (1) foamed copper as the working electrode, mixed oxide (MMO) electrode as the counter electrode, and Ag/AgCl saturated KCl as the reference electrode to form a three-electrode system; The electrolyte composition is: 0.03mol/L copper sulfate (CuSO 4 ·5H 2 O), 0.0025mol/L nickel sulfate (NiSO 4 ·6H 2 O), 0.24mol/L sodium dihydrogen phosphate (NaH 2 PO 4 ·H 2 O), 0.05mol/L sodium citrate (Na 3 C 6 H 5 O 7 ·2H 2 O), 0.50mol/L boric acid (H 3 BO 3 );

[0040] (3) Set the cathode potential to -0.92V, carry out constant potential deposition under room temperature conditions, the deposition time is 10 minutes, wash with ultrapure water and dry for later use.

[0041] Figure 1 ~ Figure 2 Shown is the morphology of the nano-copper array cathode prepared in Example 1. It can be seen from the figure that densely arranged nano-copper sheets are uniformly grown on the surface of the foamed copper. The characteristic size of the nano-copper sheets is less than 500nm in length and less than in width. 100nm, the thickness is less than 10nm; the nano copper sheets are staggered on the surface of the foamed copper, which is firmly attached and not easy to fall off.

[0042] Using the nano-copper array prepared in this embodiment as the cathode and mixed oxide (MMO) as the anode, the organic polluted wastewater is treated. The experimental process is as follows:

[0043] Select trichloroethylene as the characteristic organic pollutant, 50mmol/L sodium sulfate as the electrolyte, prepare 250mL trichloroethylene with an initial concentration of 30mg/L, and electrolyze it in a 260mL closed electrolytic cell at a constant current of 50mA for 150 minutes. The concentration of vinyl chloride changes over time ( Figure 5 ), to investigate the degradation effect of nano-copper array cathode on trichloroethylene, and the content of trichloroethylene in the solution was determined by GC-ECD.

Example Embodiment

[0044] Example 2:

[0045] (1) Take 6×2.5cm 2 Foam copper, ultrasonically immersed in acetone for 15 minutes, cleaned in ultrapure water, then immersed in 1% sulfuric acid ultrasonically for 15 minutes, cleaned in ultrapure water, and dried;

[0046] (2) Take 250 mL of electrolyte in a 260 mL electrolytic cell, use step (1) foamed copper as the working electrode, mixed oxide (MMO) electrode as the counter electrode, and Ag/AgCl saturated KCl as the reference electrode to form a three-electrode system; The electrolyte composition is: 0.03mol/L copper sulfate (CuSO 4 ·5H 2 O), 0.0025mol/L nickel sulfate (NiSO 4 ·6H 2 O), 0.24mol/L sodium dihydrogen phosphate (NaH 2 PO 4 ·H 2 O), 0.05mol/L sodium citrate (Na 3 C 6 H 5 O 7 ·2H 2 O), 0.50mol/L boric acid (H 3 BO 3 );

[0047] (3) Set the cathode potential to -0.92V, carry out constant potential deposition under room temperature conditions, the deposition time is 15 minutes, wash with ultrapure water and dry for later use.

[0048] The morphology of the nano-copper array cathode prepared in Example 2 is as follows: image 3 , Figure 4 As shown, due to the longer deposition time than in Example 1, the load increased, and the size of the copper nanosheets increased, with a length of 500 nm, a width of 100 nm, and a thickness of 10 nm; the copper nanosheets were staggered on the surface of the foamed copper, which adhered firmly and was not easy to fall off.

[0049] Using the nano-copper array prepared in this embodiment as the cathode and mixed oxide (MMO) as the anode, the organic polluted wastewater is treated. The experimental process is as follows:

[0050] Select trichloroethylene as the characteristic organic pollutant, 50mmol/L sodium sulfate as the electrolyte, prepare 250mL trichloroethylene with an initial concentration of 30mg/L, and electrolyze it in a 260mL closed electrolytic cell at a constant current of 50mA for 150 minutes. The concentration of vinyl chloride changes over time ( Figure 5 ), to investigate the degradation effect of nano-copper array cathode on trichloroethylene, and the content of trichloroethylene in the solution was determined by GC-ECD.

Example Embodiment

[0051] Example 3:

[0052] (1) Take 6×2.5cm 2 Foam copper, ultrasonically immersed in acetone for 15 minutes, cleaned in ultrapure water, then immersed in 1% sulfuric acid ultrasonically for 15 minutes, cleaned in ultrapure water, and dried;

[0053] (2) Take 250 mL of electrolyte in a 260 mL electrolytic cell, use step (1) foamed copper as the working electrode, mixed oxide (MMO) electrode as the counter electrode, and Ag/AgCl saturated KCl as the reference electrode to form a three-electrode system; The electrolyte composition is: 0.03mol/L copper sulfate (CuSO 4 ·5H 2 O), 0.0025mol/L nickel sulfate (NiSO 4 ·6H 2 O), 0.24mol/L sodium dihydrogen phosphate (NaH 2 PO 4 ·H 2 O), 0.05mol/L sodium citrate (Na 3 C 6 H 5 O 7 ·2H 2 O), 0.50mol/L boric acid (H 3 BO 3 );

[0054] (3) Set the cathode potential to -0.92V, carry out constant potential deposition under room temperature conditions, the deposition time is 5 minutes, wash with ultrapure water and dry for later use.

[0055] The nano-copper array cathode prepared in Example 3 has a shorter deposition time than that in Example 1, and the load is reduced, and the nanosheet array is not formed.

[0056] Using the nano-copper array prepared in this embodiment as the cathode and mixed oxide (MMO) as the anode, the organic polluted wastewater is treated. The experimental process is as follows:

[0057] Select trichloroethylene as the characteristic organic pollutant, 50mmol/L sodium sulfate as the electrolyte, prepare 250mL trichloroethylene with an initial concentration of 30mg/L, and electrolyze it in a 260mL closed electrolytic cell at a constant current of 50mA for 150 minutes. The concentration of vinyl chloride changes over time ( Figure 5 ), to investigate the degradation effect of nano-copper array cathode on trichloroethylene, and the content of trichloroethylene in the solution was determined by GC-ECD.

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Classification and recommendation of technical efficacy words

Improve degradation efficiency
Low production cost

Bacteria separation method for efficiently degrading high molecular weight polycyclic aromatic hydrocarbons and application thereof

ActiveCN103045507AImprove degradation efficiencyBacteriaMicrobiological testing/measurementBioremediationNutrient

Owner:北京市科学技术研究院资源环境研究所

Nano-copper array cathode for reductive degradation of organic pollutants as well as preparation and application thereof

A technology of organic pollutants and nano-copper, applied in water pollutants, water/sewage treatment, water/sludge/sewage treatment, etc. Problems such as being too scattered, achieving the effect of being suitable for large-scale production, compact arrangement, and reducing production costs

AI-Extracted Technical Summary

Problems solved by technology

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Abstract

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Examples

Example Embodiment

Example Embodiment

Example Embodiment

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Description & Claims & Application Information

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