A kind of preparation method of rare earth element doped graphene electrode for sewage treatment

Abstract

The invention discloses a preparation method of a rare earth element doped graphene electrode used for sewage treatment. Using iron, platinum, cobalt or conductive glass as the substrate, the substrate sheet is prepared by chemical vapor deposition; the substrate sheet is placed in a closed heating furnace under argon gas for high-temperature preheating for 4-6 hours; graphene and The mixed solution of rare earth element nitrate and sulfate, under the control of precision flow pump, slowly inject the mixed solution of graphene, rare earth element nitrate and sulfate into the closed reaction chamber through the capillary under the protection of argon, and keep the high temperature for continuous reaction 4‑6 Hour. The beneficial effects of the present invention are as follows: 1) efficiently oxidize and degrade the organic matter in the sewage, and greatly reduce the COD value in the sewage; 2) use the electrode to treat sewage with a fast reaction speed; 3) the reaction is efficient and non-toxic; 4) After the reaction, the electrode can be reused after treatment.

Description

technical field [0001] The invention relates to the field of sewage treatment, in particular to a method for preparing a rare earth element-doped graphene electrode used for sewage treatment. Background technique [0002] With the increasing discharge of industrial wastewater, the substandard industrial wastewater will pollute the surface water and groundwater after being discharged into the water body; once the water body is polluted, it is not easy to restore it to its original state in a short time The water quality does not meet the standards of drinking water and fishery water, and it will also increase the chemical harmful substances and hardness in the groundwater, affect the utilization of groundwater, and directly or indirectly bring harm to people's lives and health. Especially when the COD value (refers to the amount of oxidant consumed when the reducing substances in water are oxidized and decomposed under the action of an external strong oxidant under certain st...

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Problems solved by technology

Among them, the oxidant oxidation method is simple in principle, but it can only reduce the COD value formally, and there is still the possibility of causing secondary pollution; the electrolysis method is only suitable for the treatment of reducing organic substances that are difficult to be oxidized by general oxidants, and consumes a lot of power and is not Economical; biological treatment is relatively natural and non-polluting, but requires the cultivation of special microorganisms, which is slow and only suitable for treating water samples with low initial COD values