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Self-supporting porous dendritic graphite foam, and preparation method and application thereof

A graphite foam and dendritic technology, which is applied to electrodes and preparation fields with tip charge aggregation effect, can solve the problems of high chlorine content, excessive amount of bleaching powder added, insufficient sterilization effect, etc.

Pending Publication Date: 2022-01-21
CHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Of course, adding chlorine-containing bleaching powder to tap water is a more commonly used sterilization method at this stage, but in the tap water supplied by villages and towns in my country, the bacteria content in raw water is generally high, which is faced with the chlorine content caused by excessive bleaching powder High, smelly, carcinogenic problems; and the problem of insufficient bactericidal effect of low bleaching powder addition

Method used

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  • Self-supporting porous dendritic graphite foam, and preparation method and application thereof
  • Self-supporting porous dendritic graphite foam, and preparation method and application thereof
  • Self-supporting porous dendritic graphite foam, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A preparation method of self-supporting porous dendritic graphite foam, carried out in the following steps:

[0025] Step 1. Press the nickel foam substrate into a thin sheet with a thickness of 100 μm by a double-roller press to obtain sheet-shaped nickel foam, and then wash the foam with acetone, sulfuric acid and deionized water in order to remove the oxide layer on the surface for subsequent use. The pore diameter of the nickel foam substrate is 250 μm, and the thickness is 1mm;

[0026] Step 2, mixing copper sulfate, nickel chloride and boric acid to form an electrolyte, the concentration of copper sulfate in the electrolyte is 0.0001M, the concentration of nickel chloride is 0.1M, and the concentration of boric acid is 0.1M;

[0027] Put nickel foam in the electrolyte, and then grow Ni-Cu alloy dendritic branches on the three-dimensional porous framework of nickel foam by electrochemical deposition to obtain metal semi-finished products;

[0028] Electrochemical ...

Embodiment 2

[0036] A preparation method of self-supporting porous dendritic graphite foam, carried out in the following steps:

[0037] Step 1. Press the nickel foam substrate into a thin sheet with a thickness of 300 μm by a double-roller press to obtain sheet-shaped nickel foam, and then wash the foam with acetone, sulfuric acid and deionized water in order to remove the oxide layer on the surface for subsequent use. The aperture of the nickel foam substrate is 250 μm, the thickness is 3mm, the length is 50mm, and the width is 40mm;

[0038] Step 2, mixing copper sulfate, nickel chloride and boric acid to form an electrolyte, the concentration of copper sulfate in the electrolyte is 0.01M, the concentration of nickel chloride is 1M, and the concentration of boric acid is 1M;

[0039] Put nickel foam in the electrolyte, and then grow Ni-Cu alloy dendritic branches on the three-dimensional porous framework of nickel foam by electrochemical deposition to obtain metal semi-finished products...

Embodiment 3

[0050] Arrange 16 parallel electrodes in the test box, the edge of each electrode is connected through copper foil, the connection method is AC / ground / AC / ground..., and so on, such as Figure 5Shown; Electrode adopts the self-supporting porous dendritic graphite foam that embodiment 2 makes ②, injects raw water in square box, and raw water contains initial concentration and is 10 6 Escherichia coli in CFU / mL (colony / milliliter), raw water volume 100mL;

[0051] Set up multiple groups of sterilization experiments respectively. After the experiment, take samples to measure the end concentration of Escherichia coli, and calculate the sterilization efficiency. The sterilization efficiency = (initial concentration - end concentration) / initial concentration * 100%. The sterilization efficiency of each group is shown below surface:

[0052] Voltage frequency duration Bacteria removal efficiency 1 0.5V 1×10Hz 20min 92.910％ 2 4V 1×10Hz 20min 99....

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Abstract

The invention discloses a preparation method of self-supporting porous dendritic graphite foam. The preparation method comprises the following steps: growing Ni-Cu alloy dendritic branches on foamed nickel through an electrochemical deposition method, and growing graphite on a metal semi-finished product in hydrogen and ethylene through chemical vapor deposition to obtain graphite metal foam; and finally, soaking the graphite metal foam, and removing the metal framework through chemical etching to obtain the self-supported porous dendritic foam only containing graphite. The self-supporting porous dendritic graphite foam can be used as a dielectrophoresis electrode to remove bacteria in water, and is short in bacteria removal time, high in efficiency, low in energy consumption, long in service life, low in cost, safe, non-toxic and suitable for actual production.

Description

technical field [0001] The invention relates to an electrode for dielectrophoresis, in particular to an electrode with tip charge aggregation effect and a preparation method. Background technique [0002] At present, the methods of removing bacteria in water include membrane filtration, ultrasonic sterilization, ultraviolet sterilization, etc.; these generally require large-scale infrastructure construction and water purification equipment investment, and high energy consumption; not suitable for remote and underdeveloped areas . Of course, adding chlorine-containing bleaching powder to tap water is a more commonly used sterilization method at this stage, but in the tap water supplied by villages and towns in my country, the bacteria content in raw water is generally high, which is faced with the chlorine content caused by excessive bleaching powder High, smelly, carcinogenic problems; and the problem of insufficient bactericidal effect of low bleaching powder addition. [...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/205C02F1/469C02F103/02
CPCC01B32/205C02F1/4696C02F2103/02
Inventor 罗现福廖婉佑石超罗意周玉山邓平飞余伟
Owner CHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY
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