Preparation method of cement-based composite carbon electrode
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A composite carbon and cement-based technology, applied in the field of electrochemistry, can solve the problems of insufficient electrode cohesion and short life, and achieve the effects of insufficient cohesion, high service life and good electrical conductivity.
Inactive Publication Date: 2018-08-10
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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[0005] Aiming at the above-mentioned technical problems in the prior art, the present invention provides a method for preparing a cement-based composite carbon electrode. The method for preparing the cement-based composite carbon electrode should solve the problems of the electrodes used in the electrolysis process in the prior art. Technical problems of insufficient adhesion and short life
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[0017] The invention provides a method for preparing a cement-based composite carbon electrode, comprising the following steps:
[0018] 1) A step of punching holes on graphite paper; the size of the graphite paper is 2cm*4cm, and 8 holes with a diameter of 5mm are evenly drilled on its surface, (such as figure 1 shown)
[0019] 2) a step of preparing graphite powder-activated carbon-cement-fly ash composite material;
[0020] Activated carbon is used as the active material, graphite powder is used as the conductive agent, cement and fly ash are used as the binder, and the mass ratio of cement, fly ash, activated carbon and graphite powder is 4.5:3:1.5:1. Mix, add deionized water, stir well until it is completely mixed, press the obtained muddy solid on both sides of graphite paper to make the surface coating smooth, and then place it in a cement incubator at 90% humidity and 25°C The graphite powder-activated carbon-cement-fly ash composite material was prepared after being...
Embodiment 2
[0024] An example of rapid degradation of methyl orange in wastewater by using the cement-based composite carbon electrode improved by the method of the present invention.
[0025] Electrochemical degradation of methyl orange by a three-electrode system, with the cement-based composite carbon electrode prepared by the present invention as a working electrode, with titanium mesh as an auxiliary electrode, with Ag / AgCl (saturated) as a reference electrode, stirring at a speed of 150r / min Next, take 150mL of methyl orange with a concentration of 20mg / L as the degradation object, apply a square wave potential [the upper potential (Eu) and the lower potential (El) are 1.5V and -1.5V respectively, and the alternating period (T) is 1min, The concentration of methyl orange was measured every 30 min with a spectrophotometer.
[0026] Compared with the cement-based composite carbon electrode before improvement, the degradation rate of this new electrode was 73.33% (76.62% before improve...
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Abstract
The invention provides a preparation method of a cement-based composite carbon electrode. The preparation method comprises a step of punching on graphite paper and a step of preparing a graphite powder-activated carbon-cement-fly ash composite material electrode and comprises the specific steps: taking activated carbon as an active material, graphite powder as a conducting agent and cement and flyash as a bonding agent; respectively weighing and then mixing; adding de-ionized water and sufficiently stirring; pressing an obtained slurry-shaped solid matter on two faces of the graphite paper; then putting the graphite paper in a cement culture box to prepare a graphite powder-activated carbon-cement-fly ash composite material; taking the prepared composite material as a working electrode; taking a platinum electrode as an auxiliary electrode and an Ag/AgCl electrode as a reference electrode; carrying out electrodeposition for 240s under a constant potential of -0.8V; putting the electrodes subjected to the electrodeposition into an air blowing drying box and drying at constant temperature to obtain the cement-based composite carbon electrode. By adopting the method provided by the invention, the binding force of the prepared electrode is greatly improved and the service life is prolonged.
Description
technical field [0001] The field of electrochemistry of the present invention relates to an electrode, specifically a method for preparing a low-cost cement-based composite carbon electrode capable of efficiently and rapidly degrading refractory biodegradable pollutants. Background technique [0002] With the acceleration of industrialization and urbanization, urban sewage is mainly composed of domestic sewage and industrial sewage containing high concentrations of nitrogen and phosphorus. Due to the complex composition of pollutants and not easy to degrade, the water quality is no longer the traditional "municipal sewage". On the other hand, with the increasing emphasis on water pollution, especially since the country implemented energy conservation and emission reduction in 2006, the government has put forward higher requirements for the quality of effluent from urban sewage treatment plants. China has gradually begun to implement the "Pollutant Discharge Standards for Ur...
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