Graphene oxide-Cu-Co/foam titanium substrate composite electrode as well as preparation method and application thereof

Abstract

The invention discloses a graphene oxide-Cu-Co / foam titanium substrate composite electrode as well as a preparation method and application thereof, and belongs to the technical field of nitrate treatment in water. The composite electrode comprises a foam titanium substrate, a graphene oxide layer, a Cu layer and a Co layer which are arranged from inside to outside. The preparation method mainly comprises the following steps: 1) pretreating foamed titanium; 2) preparing a graphene oxide solution, and attaching graphene oxide to the surface of the foamed titanium; and 3) sequentially electroplating Cu and Co on the graphene oxide / foam titanium substrate by an electrochemical method. The composite electrode is large in specific surface area and high in catalytic efficiency, 90% or above of nitrate nitrogen and 70% or above of total nitrogen can be removed within 60 min through the coupling synergistic effect of graphene, Cu and Co, and the composite electrode is high in stability and repeatability and has good application prospects.

Description

technical field [0001] The invention belongs to the technical field of nitrate treatment in water, and more specifically relates to a composite electrode of graphene oxide-Cu-Co / foamed titanium substrate, its preparation method and its application. Background technique [0002] Nitrate is one of the most common pollutants in groundwater. It has high mobility and is not adsorbed by clay and organic matter. With the development of human society, industrial production and agricultural activities have led to increasing nitrate emissions. Relevant data show that China's North China Plain is the area where the largest amount of fertilizer is invested in the world, and 28% of its groundwater wells exceed the maximum pollution level of nitrate nitrogen concentration (20mg / L). Excessive nitrate nitrogen content in drinking water can cause carcinogenesis, teratogenicity, mutagenicity, and cause endocrine system damage, goiter and other diseases. Therefore, the problem of nitrate nit...

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Problems solved by technology

[0009] Aiming at the problem of poor treatment effect in the existing nitrate treatment technology in water, the present invention provides a graphene oxide-Co-Cu / titanium foam substrate composite electrode, in which a titanium foam substrate, a graphene oxide layer, Copper (Cu) layer and cobalt (Co) layer, the three-dimensional porous structure of titanium foam can provide more sites for the attachment of graphene oxide, strengthen the adhesion of graphene oxide, reduce the shedding during the subsequent experimental reaction, and the foam Titanium has a large specific surface area and can be fully in contact with the solution, which can effectively improve the catalytic efficiency of the electrode material; not only that, the present invention sets the Cu layer and the Co layer, and strengthens the removal of nitrate nitrogen and total nitrogen through the coupling effect of multiple elements It also reduces the falling off and precipitation of graphene oxide, improves the reusability and electrode stability of the composite electrode, and solves the problem of poor treatment effect in the prior art

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