CN-120757204-B - Iron-based cathode material for wastewater treatment and preparation method and application thereof

Abstract

The invention discloses an iron-based cathode material for wastewater treatment, and a preparation method and application thereof. Aiming at the problem that the persulfate is inhibited from being activated at the cathode by electrostatic repulsion between the surface of the cathode and the persulfate in a cathode activation persulfate reaction system, the invention provides a strategy for regulating the surface of the cathode/the persulfate by a cationic layer. The iron-based cathode material can be used for electrochemically activating persulfate to degrade organic matters in water, and has wide application prospect.

Inventors

• YANG SHAOXIA
• LIU YUQI
• YANG LIYU
• HU JINGBIN
• YU WENBO
• NIU JUNFENG

Assignees

• 华北电力大学

Dates

Publication Date

20260508

Application Date

20250819

Claims (5)

1. 1. The application of the iron-based cathode material in wastewater treatment is characterized in that the iron-based cathode material is used for strengthening the interface aggregation effect of persulfate at a cathode and promoting the activation of persulfate so as to degrade organic matters in wastewater, and the iron-based cathode material is prepared by the following method: (1) Performing surface functionalization on the carbon cloth by using a strong oxidizing solution to obtain pretreated carbon cloth; (2) Electrodepositing iron oxide on the pretreated carbon cloth by using a first deposition solution to obtain a FeOOH electrode; (3) And electrodepositing metal cations on the FeOOH electrode by using a second deposition solution to obtain an M-FeOOH electrode, wherein M is the metal cations, the metal cations are Zr 4+ 、Nd 3+ 、La 3+ or Ce 3+ , and the first deposition solution and the second deposition solution are different.
2. 2. The use of the iron-based cathode material according to claim 1, wherein in step (1), the strong oxidizing solution comprises at least one of concentrated nitric acid, concentrated sulfuric acid, sodium hypochlorite solution, and potassium permanganate solution.
3. 3. The use of the iron-based cathode material according to claim 1 in wastewater treatment, wherein in step (2), the first deposition solution comprises at least one of ferric chloride, ferrous chloride, ferric sulfate, ferrous sulfate, ferric nitrate, and ferrous nitrate.
4. 4. The use of an iron-based cathode material according to claim 1 in wastewater treatment, wherein the electrodeposited current density is 5-15 mA/cm 2 and the electrodeposited time is 10-30 min.
5. 5. The use of the iron-based cathode material according to claim 1 in wastewater treatment, wherein the organic matter comprises at least one of phenol, parachlorophenol, sulfadiazine, sulfamethoxazole and sulfamethoxazole.

Description

Iron-based cathode material for wastewater treatment and preparation method and application thereof Technical Field The invention belongs to the technical field of water treatment, and particularly relates to an iron-based cathode material for wastewater treatment, and a preparation method and application thereof. Background Along with the acceleration of industrialization progress and the rapid population increase, wastewater containing toxic and harmful organic matters becomes a great challenge for environmental protection, restricts the sustainable development of human society and becomes a current research hotspot of various countries. The organic matters such as medicines, dyes, pesticides, micro plastics and the like are widely existing in surface water and underground water, have strong biotoxicity, environmental persistence and bioaccumulation, and form potential threats to ecological environment and human health, so that the recycling of wastewater plays an important role in improving water resource shortage. In the prior art, flocculation precipitation, membrane filtration and the like are common methods for removing organic matters in water, but the methods only realize separation of the organic matters and further degrade the organic matters existing in a solid phase. The biodegradation method and the advanced oxidation method are often used for degrading the organic matters, but the biodegradation method has the defects of long treatment time, low degradation efficiency and the like, and the degradation effect of the advanced oxidation method is relatively good, wherein the electrochemical activation persulfate method has good practicability. In the electrochemical activation persulfate method, the HSO 5-/S2O82- ions are reduced at a cathode to generate Reactive Oxygen Species (ROS), such as sulfate radical (SO 4·-) and hydroxyl radical (OH) and the like, and then the ROS and organic matters undergo oxidation reaction to decompose the ROS into smaller molecules or completely mineralize the ROS into CO 2 and H 2 O. The problem of slow interfacial mass transfer exists in the process of degrading organic pollutants by using an electrochemical activation Persulfate (PS) method. In the cathode region, the surface of the cathode is negatively charged, PS exists in the electrolyte in the nature of negative charge HSO 5-/S2O82-, electrostatic repulsion can be generated between the negative charge HSO 5-/S2O82- and the PS under the interaction of the same charges, and ions are difficult to effectively adsorb on the surface of the cathode, so that the activation of the PS is influenced, and the degradation rate of organic matters is further influenced. Therefore, there is a need for an electrode material that enhances the aggregation effect of PS at the cathode interface. Disclosure of Invention In order to solve at least part of the technical problems in the prior art, the invention provides an iron-based cathode material for wastewater treatment, and a preparation method and application thereof. Specifically, the present invention includes the following. In a first aspect of the present invention, there is provided a method for preparing an iron-based cathode material for wastewater treatment, comprising the steps of: (1) Performing surface functionalization on the carbon cloth by using a strong oxidizing solution to obtain pretreated carbon cloth; (2) Electrodepositing iron oxide on the pretreated carbon cloth by using a first deposition solution to obtain a FeOOH electrode; (3) And electrodepositing metal cations on the FeOOH electrode by using a second deposition solution to obtain an M-FeOOH electrode, wherein M is the metal cations, and the first deposition solution and the second deposition solution are different. In certain embodiments, the method for preparing an iron-based cathode material for wastewater treatment according to the present invention, wherein, in step (1), the strong oxidizing solution comprises at least one of concentrated nitric acid, concentrated sulfuric acid, sodium hypochlorite solution, and potassium permanganate solution. In certain embodiments, the method for preparing an iron-based cathode material for wastewater treatment according to the present invention, wherein, in step (2), the first deposition solution comprises at least one of ferric chloride, ferrous chloride, ferric sulfate, ferrous sulfate, ferric nitrate, and ferrous nitrate. In certain embodiments, the method of preparing an iron-based cathode material for wastewater treatment according to the present invention, wherein in step (3), the metal cation comprises a high valence metal cation. In certain embodiments, the method of preparing an iron-based cathode material for wastewater treatment according to the present invention, wherein the metal cations comprise at least one of Zr4+、Nd3+、La3+、Ce3+、Mg2+、Cu2+、Zn2+、Mn2+、Na+ and K +. In certain embodiments, the method for preparing an iron-based cathode material