CN112939154A - Microbubble-aerated rotary electro-Fenton cathode and application thereof - Google Patents

Microbubble-aerated rotary electro-Fenton cathode and application thereof Download PDF

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CN112939154A
CN112939154A CN202110111005.1A CN202110111005A CN112939154A CN 112939154 A CN112939154 A CN 112939154A CN 202110111005 A CN202110111005 A CN 202110111005A CN 112939154 A CN112939154 A CN 112939154A
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cathode
fenton
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bevel gear
aerated
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邓凤霞
荆宝剑
俞涤非
曹玉林
张广浦
邱珊
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Harbin Institute of Technology
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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
    • C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
    • C02F1/46104—Devices therefor; Their operating or servicing
    • C02F1/46109—Electrodes
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
    • C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
    • C02F1/46104—Devices therefor; Their operating or servicing
    • C02F1/46109—Electrodes
    • C02F2001/46133—Electrodes characterised by the material
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/30—Organic compounds
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2201/00—Apparatus for treatment of water, waste water or sewage
    • C02F2201/46—Apparatus for electrochemical processes
    • C02F2201/461—Electrolysis apparatus
    • C02F2201/46105—Details relating to the electrolytic devices
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2201/00—Apparatus for treatment of water, waste water or sewage
    • C02F2201/46—Apparatus for electrochemical processes
    • C02F2201/461—Electrolysis apparatus
    • C02F2201/46105—Details relating to the electrolytic devices
    • C02F2201/4619—Supplying gas to the electrolyte
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2305/00—Use of specific compounds during water treatment
    • C02F2305/02—Specific form of oxidant
    • C02F2305/026—Fenton's reagent

Abstract

A micro-bubble aeration type rotary electro-Fenton cathode and application thereof relate to an electro-Fenton cathode and application thereof and aim to solve the problem that the conventional electro-Fenton cathode is used for electrosynthesis of H2O2The process has the technical problem of poor oxygen transfer capacity. The microbubble aerated rotary electro-Fenton cathode comprises an oxygen source, a speed reducing motor, a bevel gear steering device, a universal valve and a porous cathode; wherein the porous cathode consists of a hollow shaft and a foam metal head fixedly connected with the hollow shaft; the hollow shaft penetrates through the longitudinal shaft bevel gear and is connected with the universal valve, the other end of the universal valve is connected with an oxygen source, and the transverse shaft bevel gear is connected with the speed reduction motor. The micro-bubble aeration type rotary electro-Fenton cathode is used for an electro-Fenton reactor to treat organic wastewater, and H is higher when the rotating speed is 200rpm2O2The yield of (a) is 2 times that of the conventional cathode. The invention can be used in the field of sewage treatment.

Description

Microbubble-aerated rotary electro-Fenton cathode and application thereof
Technical Field
The invention relates to an electro-Fenton cathode and application thereof, belonging to the technical field of environmental engineering.
Background
electro-Fenton is one of the technologies of electrochemical treatment of wastewater, compared with the traditional Fenton, by adding iron salt catalyst and H2O2So as to realize the oxidation removal of organic pollutants in the wastewater, and the electro-Fenton technology has the function of in-situ 2-electron oxygen reduction (ORR) electrosynthesis of H2O2(formula 1-1), easy to control. At the same time, cathode Fe3+The reduction can continuously supplement Fe for the classical Fenton reaction2+Catalyst, and then reducing Fe2+To finally reduce the yield of iron sludge (formula 1-2, 1-3). Therefore, electro-Fenton has recently been widely used as a new advanced oxidation technology in the treatment of organic wastewater difficult to treat, such as phenol, antibiotics, and pesticides.
O2+2e-+2H+→H2O2 (1-1)
H2O2+Fe2+→Fe3++-OH+·OH (1-2)
Fe3++e-→Fe2+ (1-3)
However, the key factor limiting the further improvement of the electro-Fenton oxidation performance is the cathode 2 electron ORR electrosynthesis of H2O2The amount of (c). Therefore, in recent years, electro-Fenton technology mainly focuses on the design/preparation of the cathode, namely, the design and modification of the cathode material enhance the electron transfer (electrochemical process) of 2-electron ORR. For example, chinese patent publication No. CN111969217A discloses a method of modifying a carbon brush by polyaniline two-step electrodeposition, which is assisted by carbonization and activation to prepare a cathode without a binder; chinese patent publication No. CN110818033A discloses a graphene gas diffusion electrode. However, 2-electron ORR electrosynthesis of H2O2Not only is controlled by electron transfer, but also is controlled by oxygen liquid phase mass transfer process. Therefore, in addition to focusing on the electron transfer process at the cathode interface, the oxygen mass transfer problem of the precursor should be more focused. Wherein 2-electron ORR is electrosynthesized into H2O2The process utilizes dissolved oxygen, and the concentration (8mg/L) and diffusion rate (2X 10) of the dissolved oxygen at normal temperature-9m2s-1And 25 deg.C) are relatively limited. Thereby causing the liquid phase mass transfer of oxygen to be hindered. In view of the double-layer thickness
Figure BDA0002916628680000011
Typically the thickness of the diffusion layer
Figure BDA0002916628680000012
0.01% of the total mass transfer rate of oxygen in the electric double layer, which is the rate-limiting step of oxygen liquid phase mass transfer in the diffusion layer. How to realize the mass transfer of precursor oxygen in the diffusion layer is to improve the H of cathodic electrosynthesis2O2Is critical. Simultaneous cathodic electrosynthesis of H2O2The inevitable hydrogen evolution reaction in the process causes tiny hydrogen bubbles to be attached to the surface of the cathode to form a bubble water curtain, so that the resistance is increased, the specific surface area is reduced, and the mass transfer of oxygen is further hindered.
Disclosure of Invention
The invention aims to solve the problem that the existing electro-Fenton cathode is used for electrosynthesis of H2O2The technical problem of poor oxygen transmission energy in the process is solved, and the microbubble aerated rotary electro-Fenton cathode and the application thereof are provided.
The microbubble aerated rotary electro-Fenton cathode comprises an oxygen source 1, a speed reducing motor 2, a bevel gear steering device 3, a universal valve 4 and a porous cathode 5;
wherein the porous cathode 5 consists of a hollow shaft 5-1 and a foam metal head 5-2 fixedly connected with the hollow shaft; the middle upper part of the outer wall of the hollow shaft 5-1 is also provided with a conductive slip ring 5-1-1 and a power interface 5-1-2; the conductive slip ring is sleeved outside the hollow shaft 5-1, and the power interface 5-1-2 is connected with the conductive slip ring 5-1-1; the conductive slip ring 5-1-1 can slide and rotate on the outer wall of the hollow shaft 5-1;
the bevel gear steering device 3 comprises a transverse shaft bevel gear 3-1 and a longitudinal shaft bevel gear 3-2; an axial hole 3-2 is formed in the axial center position of the longitudinal shaft bevel gear 3-2; the transmission ratio of the gear rotating shaft of the transverse axis bevel gear 3-1 and the longitudinal axis bevel gear 3-2 is (2-3): 1; the hollow shaft 5-1 penetrates through a shaft center hole 3-2 of the longitudinal shaft bevel gear 3-2 and is connected with the universal valve 4; the other end of the universal valve 4 is connected with the oxygen source 1; the transverse shaft bevel gear 3-1 is connected with the speed reducing motor 2; the reduction motor 2 drives the longitudinal shaft bevel gear 3-2 to rotate, and drives the transverse shaft bevel gear 3-1 to rotate in a speed reduction manner through the gear transmission and steering action, so that the porous cathode 5 rotates.
Further, the foam metal head 5-2 is porous foam metal;
further, the porous foam metal is titanium foam, nickel foam or copper foam;
furthermore, the upper part of the foam metal head is cylindrical, and the lower part of the foam metal head is hemispherical;
furthermore, the microbubble aerated rotary electro-Fenton cathode also comprises a lifting support table 6; the speed reducing motor 2 is fixed on the lifting support platform 6; the height of the speed reducing motor 2 can be controlled through the lifting support platform 6, and further the position of the porous cathode 5 can be controlled.
The application of the microbubble aeration type rotary electro-Fenton cathode is used for an electro-Fenton reactor to treat organic wastewater, and the specific method comprises the following steps:
placing an anode 7 and a porous cathode 5 into a reactor tank body 8, wherein the heights of the anode 7 and the porous cathode 5 are consistent; connecting the anode of a two-port direct current power supply 9 with the anode 7, and connecting the cathode of a two-port direct current power supply 8 with the porous cathode 5;
adjusting the pH value of the organic wastewater to 2-6, adding the organic wastewater into a reactor tank body 8, and then adding Fe2+A catalyst;
setting the rotation speed of the speed reducer 2 to be 100-1200 rpm, and setting the oxygen flow of the oxygen source 1 to be 0.1L min per ml of solution-1～10L min-1Controlling, namely starting a speed reducing motor 2 and a magnetic stirrer 10, then starting a two-port direct-current power supply 9, and controlling the current applied by a system in a constant current mode to enable the current of the porous cathode 5 to be 5-500 mA; controlling the hydraulic retention time of the organic wastewater in the reactor tank body 8 to be 30-480 min, and finishing the treatment of the organic wastewater.
Further, the anode 7 is a boron-doped diamond electrode (BDD), a titanium suboxide anode or a platinum sheet anode;
further, Fe described in step two2+The concentration of the catalyst is 0.01 mM-1 mM;
further, the gas flow rate of the oxygen source 1 is controlled by a rotameter;
further, the aeration rate is in the range of 0.3L min per ml of the solution-1～2L min-1。
Further, the reduction motor 2 is controlled by a reducer controller, and the rotation speed of the reducer can be adjusted by the controller.
Furthermore, in the second step, the reactor tank 8 is placed on the magnetic stirrer 10, and the magnetic stirring rotor 11 is placed in the reactor tank 8; the gas phase and the liquid phase are disturbed in the reaction process, so that the full mixing and stirring are achieved, and the mass transfer of the solution solute in the cathode diffusion layer and the reactor and the promotion of the dissolved oxygen are facilitated.
The invention designs a micro-bubble aeration type rotary electro-Fenton cathode. By utilizing a dispersion method, namely, compressed oxygen passes through the porous metal cathode to form oxygen microbubbles, rotation is assisted, the oxygen microbubbles are further cut by utilizing shearing force, the initial dissolved oxygen concentration can be greatly improved by utilizing the huge specific surface area and the extremely strong dissolving capacity of the oxygen microbubbles, and finally the integrated electro-Fenton cathode of the micro-nano aeration is formed. Meanwhile, the rotating cathode throws out bubbles by utilizing strong shearing force and centrifugal force and can relieve the bubble water curtain of the cathode, thereby improving the electrosynthesis H of the 2-electron ORR2O2Oxygen mass transfer problems faced by the process.
The working principle of the microbubble aerated rotary electro-Fenton cathode is as follows: h2O2Generated mainly at the cathode by the 2-electron ORR process, in order to promote H during the reaction2O2The thickness of the conductive layer formed by the ORR reaction of the cathode is controlled by controlling the rotation speed of the cathode (formula 1-4).
Figure BDA0002916628680000031
Delta is the thickness of the diffusion layer (nm), omega is the rotation rate (rad/s) and D is the diffusion efficiency
The formula shows that the faster the rotation rate is, the thinner the diffusion layer thickness on the cathode surface is, and because the reactor electrode is in an aeration type, the gas passes through the hollow shaft 5-1 of the porous cathode 5, enters the porous structure of the foam metal, rotates, cuts and finally enters the reactor tank body, thereby greatly improving the three-phase mass transfer efficiency of the cathode oxygen-water-cathode of the traditional reactor. Through experimental verification, the rotary aerated cathode electrode reactor has H at the rotating speed of 200rpm2O2The yield of (2) is 2 times that of non-rotation. The electro-Fenton reactor regulates and controls the electron transfer efficiency through the rotation of the cathode and a special aeration mode, and changes the thickness of a mass transfer layer through the rotating speed, so that the H under the same energy consumption is improved2O2Yield and efficiency of removing organic matters from the sewage.
The invention can be used in the field of sewage treatment.
Drawings
Fig. 1 is a schematic structural diagram of a microbubble-aerated rotary electro-fenton cathode according to the present invention.
Fig. 2 is a schematic structural view of the porous cathode 5.
Fig. 3 is a schematic structural view of the bevel gear steering device 3.
In FIGS. 1 to 3: 1 is an oxygen source, 2 is a speed reducing motor, 3 is a bevel gear steering device, 3-1 is a transverse shaft bevel gear, and 3-2 is a longitudinal shaft bevel gear; 4 is a universal valve, 5 is a porous cathode, 5-1 is a hollow shaft, 5-1-1 is a conductive slip ring, and 5-1-2 is a power interface; 5-2 is a foam metal head; 6 is a lifting support platform; 7 is an anode, 8 is a reactor tank body, 9 is a two-port direct current power supply, 10 is a magnetic stirrer, and 11 is a magnetic stirring rotor 11.
FIG. 4 is a schematic diagram showing the structure of an electro-Fenton reactor constructed by rotating an electro-Fenton cathode with microbubble aeration in example 1.
FIG. 5 is a graph showing the results of example 1 in which the rotating cathode was rotated at different speeds at the same aeration rate2O2Yield comparison graph.
FIG. 6 shows electrons and H at the cathode in the reaction of example 12O2The relationship between the yields.
FIG. 7 is a schematic view showing a structure of a conventional electro-Fenton reactor for comparison; in the figure, 12 is a platinum sheet anode, 13 is a titanium foam plate cathode, 14 is a traditional reactor tank body, 15 is a two-port direct current power supply, 16 is a magnetic stirrer, 17 is a magnetic stirring rotor, and 18 is a glass tube.
FIG. 8 is a graph showing H of the electro-Fenton reactor of example 1 and a conventional electro-Fenton reactor as a comparison2O2Yield comparison graph.
Fig. 9 is a graph showing degradation rate profiles of a micro-bubble aerated rotary electro-fenton cathode reactor, a conventional aerated non-rotary cathode reactor, and an anode oxidation.
Detailed Description
The following examples are used to demonstrate the beneficial effects of the present invention:
example 1: the microbubble aeration type rotary electro-Fenton cathode of the embodiment comprises an oxygen source 1, a speed reducing motor 2, a bevel gear steering device 3, a universal valve 4, a porous cathode 5 and a lifting support table 6;
wherein the porous cathode 5 consists of a hollow shaft 5-1 and a foam metal head 5-2 fixedly connected with the hollow shaft; the length of the hollow shaft 5-1 is 10cm, the outer diameter of the hollow shaft 5-1 is 0.6cm, and the inner diameter is 0.314 cm; the upper part of the titanium foam is a cylinder with the diameter of 3.1cm and the height of 1.2cm, and the lower part of the titanium foam is a hemisphere with the diameter of 3.1 cm;
the middle upper part of the outer wall of the hollow shaft 5-1 is also provided with a conductive slip ring 5-1-1 with the inner diameter of 7mm and the outer diameter of 33mm and a power interface 5-1-2; the conductive slip ring is sleeved outside the hollow shaft 5-1, and the power interface 5-1-2 is connected with the conductive slip ring 5-1-1; the conductive slip ring 5-1-1 can slide and rotate on the outer wall of the hollow shaft 5-1;
the bevel gear steering device 3 consists of a transverse shaft bevel gear 3-1 and a longitudinal shaft bevel gear 3-2; an axial hole 3-3 is arranged at the axial center position of the longitudinal shaft bevel gear 3-2; the transmission ratio of the horizontal axis bevel gear 3-1 to the vertical axis bevel gear 3-2 is 2: 1; the hollow shaft 5-1 penetrates through a shaft center hole 3-3 of the longitudinal shaft bevel gear 3-2 and is connected with the universal valve 4, and the shaft center hole 3-3 is tightly matched with the hollow shaft 5-1; the other end of the universal valve 4 is connected with the oxygen source 1; the transverse shaft bevel gear 3-1 is connected with the speed reducing motor 2; the reduction motor 2 drives the transverse shaft bevel gear 3-1 to rotate, and drives the longitudinal shaft bevel gear 3-2 to rotate in a speed reduction manner through the gear transmission and steering action, so that the porous cathode 5 rotates; the speed reducing motor 2 is fixed on the upper part; the height of the speed reducing motor 2 can be controlled through the lifting support table 6, and then the position of the porous cathode 5 is controlled; the universal valve is model number 4 glide TED 113/116.
The micro-bubble aeration type rotary electro-Fenton cathode in example 1 is used for an electro-Fenton reactor to treat organic wastewater (see the attached figure 4 for a specific device), and the specific method is as follows:
firstly, placing a boron-doped diamond electrode (BDD) anode 7 and a porous cathode 5 into a reactor tank body 8 with the volume of 500mL, wherein the heights of the anode 7 and the porous cathode 5 are consistent; the top of the reactor is of an open structure so as to be convenient for sampling in the reaction process, the anode of a two-port direct current power supply 9 is connected with the anode 7, and the cathode of the two-port direct current power supply 9 is connected with the porous cathode 5; placing the reactor tank 8 on a magnetic stirrer 10, and placing a magnetic stirring rotor 11 in the reactor tank 8; the gas phase and the liquid phase are disturbed in the reaction process, so that the full mixing and stirring are achieved, and the mass transfer of the solution solute in the cathode diffusion layer and the reactor and the promotion of the dissolved oxygen are facilitated.
II, mixing 280mL of 50 mM Na2SO4Adding electrolyte solution into the reactor tank body 8, adjusting the pH value to 3, and adding FeSO4As Fe2+Catalyst concentration of 20. mu. mol L-1；
Thirdly, adjusting the rotating speed of the speed reducer 2 to be 0rpm, 100rpm, 200rpm and 300rpm respectively through a controller; the oxygen source 1 is oxygen, and the flow of the oxygen is controlled by a rotameter for 0.3L min-1After the speed reducing motor 2 and the magnetic stirrer 10 are started, the two-port direct-current power supply 9 is started, the current applied by the system is controlled in a constant-current mode, and the current of the porous cathode 5 is 20 mA; controlling the total hydraulic retention time of the electrolyte solution in the reactor tank body 8 to be 120min, sampling 12 times in the period, and respectively recording H2O2The accumulated amount of (3).
As shown in FIG. 5, it can be seen from FIG. 5 that the microbubble-aerated rotary electro-Fenton cathode reactor of the present embodiment exhibits different H values under the same conditions and at different rotation speeds2O2The cumulative amount. At a rotation speed of 200rpm, the most stable and highest H2O2Cumulant, which proves that the microbubble aeration type rotary electro-Fenton cathode reactor of the embodiment has an adjustable rule for the thickness of the reaction mass transfer layer and the reaction mass transfer of the dissolved oxygen in the solution, can greatly improve the H in the reaction process2O2Generation rate of (2) and H2O2Is more favorable to H2O2And Fe2+The classical Fenton reaction occurs in the reaction process, and the treatment capacity of organic matters in the sewage is improved.
Electrochemical synthesis of H by assuming that Faraday current on cathode is only used for 2-electron ORR2O2And a pair of2O2The accumulated amount is calculated to obtain the rotatable cathode current efficiency, and the result is shown in fig. 6, and it can be seen from the result that the current utilization efficiency is the highest when the operation time reaches 120min, and the result is consistent with the result in fig. 5.
Comparing the microbubble aeration type rotary electro-Fenton cathode reactor of the embodiment 1 with the traditional aeration type non-rotary cathode reactor, examining the electrode rotary structure and aeration mode of the micro-nano bubbles2O2Influence of the accumulation amount. The structure of a conventional electro-Fenton reactor for comparison is a non-rotary aeration type cathode electro-Fenton reactor, and the structural schematic diagram refers to FIG. 7. The specific method comprises the following steps:
firstly, placing a platinum sheet anode 12 and a foamed titanium plate cathode 13 into a reactor tank body 14, wherein the volume of the reactor tank is 500mL, and the heights of the platinum sheet anode 12 and the foamed titanium plate 13 are consistent; the top of the reactor is of an open structure so as to be convenient for sampling in the reaction process, the anode of a two-port direct current power supply 15 is connected with a platinum sheet anode 12, and the cathode of the two-port direct current power supply 15 is connected with a foamed titanium plate cathode 13; placing the reactor tank 14 on a magnetic stirrer 16, and placing a magnetic stirring rotor 17 in the reactor tank 14; the glass tube 18 is directly aerated into the water.
II, mixing 280mL of 50 mM Na2SO4Adding electrolyte solution into the reactor tank body 14, adjusting the pH value to 3, and then adding Fe2+A catalyst; FeSO4Has a concentration of 20. mu. mol L-1；
Thirdly, oxygen is introduced into the water through the glass tube 14, the aeration gas flow is controlled by the rotameter to be consistent with the rotary aeration type cathode, and the flow is 0.3L min-1Starting a two-port direct-current power supply 15, and controlling the current of the foamed titanium plate cathode 13 to be 20mA in a constant-current mode; control of Na in reactor tank 142SO4The hydraulic retention time of the electrolyte solution is 120min, the samples are taken 12 times, and H is recorded respectively2O2The accumulated amount of (3).
The electrode of example 1 was rotated at 200rpm and H2O2The accumulated amount of the carbon dioxide is equal to the H of the traditional non-rotary aeration type cathode electro-Fenton reactor2O2The accumulated amount of (A) is plotted in FIG. 8. from FIG. 8, it can be seen that the microporous aeration type rotary cathodic electro-Fenton reactor of example 1 is compared with the conventional electro-Fenton reactor in H2O2The yield is remarkably improved by about 50%.
The micro-bubble aeration type rotary electro-fenton cathode reactor (device shown in fig. 4) and the traditional aeration type non-rotary cathode reactor (device shown in fig. 7) of example 1 were simultaneously treated with the sulfathiazole antibiotic wastewater for comparison, and the specific test steps were as follows:
firstly, adding 280mL of sulfathiazole antibiotic wastewater into a microporous aeration type rotary cathode electro-Fenton reactor and a traditional aeration type non-rotary cathode reactor respectively, adjusting the pH value of a reaction solution to 3, and then adding FeSO4As Fe2+Catalyst, Fe2+The concentration of the catalyst was 20. mu. mol L-1The concentration of the sulfathiazole antibiotic in the sulfathiazole antibiotic wastewater is 50mg L-1；
Setting the current of a direct current power supply at two ports of the microbubble aeration type rotary electro-Fenton cathode reactor to be 20mA, starting a rotary motor of the reactor after the power supply is started, and setting the rotating speed of the rotary cathode to be 200rpm; simultaneously controlling the oxygen aeration flow to be 0.2m3 h-1；
The current of a direct current power supply at two ports of a traditional aeration type non-rotating cathode reactor is 20mA, and the aeration flow is controlled to be the same as the aeration quantity of the reactor in the embodiment;
and thirdly, operating the two groups of reactors simultaneously, setting the sampling time to be 20min, 40min, 60min, 90min, 120min, 150min and 180min respectively, and observing the sulfathiazole degradation rates of the two groups of the embodiment and the comparison group with the same reaction time.
The degradation rate of sulfathiazole in the same reaction time and different time periods of the microbubble aerated rotary electro-Fenton cathode reactor and the traditional aerated non-rotary cathode reactor are shown in Table 1.
TABLE 1 degradation rates of a micro-porous aerated rotary cathode electro-Fenton reactor and a conventional aerated non-rotary cathode reactor
Figure BDA0002916628680000071
The microbubble aerated rotary electro-Fenton cathode reactor, the traditional aerated non-rotary cathode reactor and the anodic oxidation degradation rate are also simultaneously drawn in figure 9, the degradation effect of anodic oxidation is removed, and the dissolution rates of the microbubble aerated rotary electro-Fenton cathode reactor in different reaction sampling time periods are all greater than those of the traditional non-rotary conventional aerated cathode electro-Fenton reactor. The antibiotic removal efficiency of the microporous aeration type rotary electro-Fenton cathode in different reaction stages is higher than that of a non-rotary conventional aeration cathode.
In conclusion, the microporous aeration type rotary electro-Fenton cathode has the function of efficiently accumulating H2O2And high current efficiency, overcomes the defects of low electron reaction rate and low current efficiency of the cathode 2 of the traditional electro-Fenton reactor, and has good effect of removing antibiotic pollutants in sewage. Has a greater lift than a non-rotating conventional aerated cathode.

Claims (10)

1. A micro-bubble aeration type rotary electro-Fenton cathode is characterized by comprising an oxygen source (1), a speed reducing motor (2), a bevel gear steering device (3), a universal valve (4) and a porous cathode (5);
wherein the porous cathode (5) consists of a hollow shaft (5-1) and a foam metal head (5-2) fixedly connected with the hollow shaft; the middle upper part of the outer wall of the hollow shaft (5-1) is also provided with a conductive slip ring (5-1-1) and a power interface (5-1-2); the conductive slip ring is sleeved outside the hollow shaft (5-1), and the power interface (5-1-2) is connected with the conductive slip ring (5-1-1);
the bevel gear steering device (3) comprises a transverse shaft bevel gear (3-1) and a longitudinal shaft bevel gear (3-2); an axial hole 3-2 is arranged at the axial center position of the longitudinal axis bevel gear (3-2); the transmission ratio of the gear rotating shaft of the transverse axis bevel gear (3-1) to the longitudinal axis bevel gear (3-2) is (2-3): 1; the hollow shaft (5-1) penetrates through a shaft center hole 3-2 of the longitudinal shaft bevel gear (3-2) and is connected with the universal valve (4); the other end of the universal valve (4) is connected with an oxygen source (1); the transverse shaft bevel gear (3-1) is connected with the reducing motor (2); the reduction motor (2) drives the longitudinal shaft bevel gear (3-2) to rotate, and drives the transverse shaft bevel gear (3-1) to rotate in a speed reduction manner through the gear transmission and steering action, so that the porous cathode (5) rotates.
2. A micro-bubble aerated rotary electro-fenton cathode according to claim 1, characterized in that the metal foam head (5-2) is a porous metal foam.
3. A microbubble aerated rotary electro-fenton cathode according to claim 1 or 2, characterized in that the porous metal foam is titanium foam, nickel foam or copper foam.
4. A microbubble aerated rotary electro-fenton cathode according to claim 1 or 2, characterized in that the upper part of the metal foam head is cylindrical and the lower part is hemispherical.
5. A microbubble aerated rotary electro-fenton cathode according to claim 1 or 2, wherein the microbubble aerated rotary electro-fenton cathode further comprises an elevating support table 6; the speed reducing motor (2) is fixed on the lifting support platform 6.
6. Use of a micro-bubble aerated rotary electro-Fenton cathode according to claim 1, wherein the use is for treating organic wastewater using a micro-bubble aerated rotary electro-Fenton cathode in an electro-Fenton reactor.
7. The use of a micro-bubble aerated rotary electro-Fenton cathode according to claim 6, wherein the method of using a micro-bubble aerated rotary electro-Fenton cathode in an electro-Fenton reactor for treating organic wastewater comprises:
placing an anode (7) and a porous cathode (5) into a reactor tank body (8), wherein the heights of the anode (7) and the porous cathode (5) are consistent; connecting the anode of a two-port direct current power supply (9) with the anode (7), and connecting the cathode of a two-port direct current power supply (8) with the porous cathode (5);
adjusting the pH value of the organic wastewater to 2-6, adding the organic wastewater into a reactor tank body (8), and then adding Fe2+A catalyst;
setting the rotation speed of the speed reducer 2 to be 100-1200 rpm, and setting the oxygen flow of the oxygen source (1) to be 0.1L min per milliliter of solution-1～10L min-1Controlling, after the speed reducing motor (2) and the magnetic stirrer (10) are started, starting the two-port direct current power supply (9), and controlling the current applied by the system in a constant current mode to enable the current of the porous cathode (5) to be 5-500 mA; controlling the hydraulic retention time of the organic wastewater in the reactor tank body (8) to be 30-480 min, and finishing the treatment of the organic wastewater.
8. Use of a microbubble aerated rotary electro-Fenton cathode according to claim 7, characterised in that the anode (7) is a boron doped diamond electrode, a titanium sub-oxide anode or a platinum sheet anode.
9. Use of a microbubble-aerated rotary electro-Fenton cathode according to claim 7 or 8, characterized in that the Fe in step two2+The concentration of the catalyst is 0.01 mM-1 mM.
10. Use of a microbubble-aerated rotary electro-Fenton cathode according to claim 7 or 8, characterised in that in step two the reactor tank (8) is placed on a magnetic stirrer (10) and a magnetic stirring rotor (11) is placed in the reactor tank (8).
CN202110111005.1A 2021-01-26 2021-01-26 Microbubble-aerated rotary electro-Fenton cathode and application thereof Pending CN112939154A (en)

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