Preparation method and application of metal electrode for reducing nitrate nitrogen in wastewater
A metal electrode and nitrate nitrogen technology, applied in the field of environmental electrochemistry, can solve the problems of expensive nanomaterials, poor performance of metal sheets, complex production process, etc., and achieve simple preparation methods, high electrochemical reduction activity of nitrate, The effect of low energy consumption
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Embodiment 1
[0046] The nickel foam with a size of 4 × 4 cm was placed in acetone and 3mol / L hydrochloric acid solution for 15 minutes, cleaned with deionized water and absolute ethanol, and dried in an oven to complete the pretreatment. The pretreated nickel foam was used as the working electrode, the platinum plate electrode was used as the counter electrode, and the saturated calomel electrode was used as the reference electrode to build a three-electrode system. The distance between the working electrode and the counter electrode was 15 mm. Using 1mol / L sodium hydroxide solution as the initial electrolyte, an electrochemical workstation was used to apply a potential of -1.4V (vs. SCE) to the working electrode in constant potential mode and keep it for 2min. After electrochemical treatment, the obtained material is a nickel foam electrode with a large number of nickel nanoparticles on the surface, and its surface morphology is as follows: figure 1 , figure 2 shown.
[0047] The metal...
Embodiment 2
[0055] With pretreated nickel foam (the pretreatment step is the same as in Example 1) as the cathode, and the platinum sheet as the anode, a two-electrode system is built, the distance between the cathode and the anode is 15mm, and the 1mol / L sodium hydroxide solution is used as the electrolyte, and the direct current The power supply applies a voltage of 2.0V between the cathode and the anode, and keeps it for 2min. After electrochemical treatment, the obtained material is a foamed nickel electrode with a large number of nickel nanoparticles on the surface.
[0056] The metal electrode is used as the cathode, and the IrO 2 -RuO 2 / Ti electrode was used as the anode to carry out the electrochemical reduction experiment of nitrate nitrogen. Taking 100mL of synthetic wastewater with an initial pH of 7 and an initial nitrate nitrogen concentration of 70mg / L as the treatment object, at a current density of 25mA / cm 2 Run in the constant current mode for 1h, the test results are...
Embodiment 3
[0059] Prepare a foamed nickel electrode by the same method as in Example 1, and use the metal electrode as a cathode, and IrO 2 -RuO 2 The / Ti electrode is used as the anode, and it is applied to the nitrate nitrogen wastewater treatment test of a central enterprise catalyst company in Hunan. Taking 300mL of actual wastewater with an initial concentration of about 2650mg / L nitrate nitrogen as the treatment object, at a current density of 12.5mA / cm 2 Run 24h in the constant current mode.
[0060] Figure 5 The metal electrode prepared for this example is the degradation situation of the actual high-concentration nitrate nitrogen industrial wastewater. It can be seen from the figure that the metal electrode can effectively remove high-concentration nitrate nitrogen in industrial wastewater.
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