Pd/NiCo2O4/Ni foam composite electrode as well as preparation method and application thereof
A composite electrode and electrodeposition technology, applied in chemical instruments and methods, water/sewage treatment equipment, water/sludge/sewage treatment, etc., can solve problems such as limited reuse, hindered catalytic activity, and reduced activity, and achieve catalytic The effect of many active sites, long service life, and less usage
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Embodiment 1
[0030] Preparation of a Pd / NiCo 2 O 4 / Ni foam composite electrode, including the following steps:
[0031] a. Pretreatment of nickel foam: the thickness of 1.2mm and the size and area of 4cm 2 The (2cm × 2cm) foamed nickel substrate was sonicated with 3mol / L hydrochloric acid for 30 minutes in order to remove the surface oxide layer, and then washed with absolute ethanol for 5 minutes to remove the surface organic matter, and finally washed with distilled water three times and then dried in the air , Get the pretreated foamed nickel matrix. The scanning electron microscope image of the pretreated nickel foam substrate is as follows figure 2 Shown
[0032] b, NiCo 2 O 4 Preparation of the intermediate layer: Ni(NO 3 ) 2 ·6H 2 O, Co(NO 3 ) 2 ·6H 2 O, NH 4 F, CO(NH 2 ) 2 Dissolved in water at a molar ratio of 1:2:6:15, where Ni(NO 3 ) 2 ·6H 2 The concentration of O in water is 0.00167mol / L, and the reaction solution A is prepared; the foamed nickel matrix pretreated in step a is a...
Embodiment 2
[0038] In this example 2, NiCo 2 O 4 The preparation process of the / Ni foam composite electrode repeats the steps a and b in Example 1.
[0039] Example 2 NiCo prepared 2 O 4 / Ni foam composite electrode, applied to the electrocatalytic reduction dechlorination reaction of wastewater containing 2,4-D. The experimental process of the electrocatalytic reduction dechlorination reaction is the same as in Example 1. The results of electrocatalytic reduction dechlorination for 2 hours are shown in Table 1. Shown.
Embodiment 3
[0041] In this example 3, Pd / NiCo 2 O 4 The preparation process of the / Ni foam composite electrode was repeated in Example 1.
[0042] Pd / NiCo prepared in Example 3 2 O 4 / Ni foam composite electrode, applied to the electrocatalytic reduction dechlorination reaction of wastewater containing 2,4-D. The experimental process of the electrocatalytic reduction dechlorination reaction is the same as that of Example 1, except that the constant voltage is replaced with -1.2V The remaining experimental steps of the electrocatalytic reduction dechlorination reaction are the same as in Example 1, and the results of the electrocatalytic reduction dechlorination for 2 hours are shown in Table 1.
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