CN112337434A - 3D printing-based graphene composite material preparation method and sewage purification device - Google Patents

3D printing-based graphene composite material preparation method and sewage purification device Download PDF

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Publication number
CN112337434A
CN112337434A CN202011337222.4A CN202011337222A CN112337434A CN 112337434 A CN112337434 A CN 112337434A CN 202011337222 A CN202011337222 A CN 202011337222A CN 112337434 A CN112337434 A CN 112337434A
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tank body
sewage
composite material
graphene
printing
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CN202011337222.4A
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Chinese (zh)
Inventor
张惠宁
石中玉
尹鑫
肖彦奎
韩建平
王少峰
高世铭
吴志国
魏智强
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Baiyin Hi Tech Industry Research Institute
GANSU PROV ACADEMY OF SCIENCES
Lanzhou University of Technology
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Baiyin Hi Tech Industry Research Institute
GANSU PROV ACADEMY OF SCIENCES
Lanzhou University of Technology
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Priority to CN202011337222.4A priority Critical patent/CN112337434A/en
Publication of CN112337434A publication Critical patent/CN112337434A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
    • B01J20/20—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising free carbon; comprising carbon obtained by carbonising processes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
    • B01J20/28014—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their form
    • B01J20/28047—Gels
    • 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
    • C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
    • 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
    • C02F1/28—Treatment of water, waste water, or sewage by sorption
    • C02F1/283—Treatment of water, waste water, or sewage by sorption using coal, charred products, or inorganic mixtures containing them
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2220/00—Aspects relating to sorbent materials
    • B01J2220/40—Aspects relating to the composition of sorbent or filter aid materials
    • B01J2220/48—Sorbents characterised by the starting material used for their preparation
    • B01J2220/4806—Sorbents characterised by the starting material used for their preparation the starting material being of inorganic character
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2220/00—Aspects relating to sorbent materials
    • B01J2220/40—Aspects relating to the composition of sorbent or filter aid materials
    • B01J2220/48—Sorbents characterised by the starting material used for their preparation
    • B01J2220/4812—Sorbents characterised by the starting material used for their preparation the starting material being of organic character

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Environmental & Geological Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Water Supply & Treatment (AREA)
  • Engineering & Computer Science (AREA)
  • Hydrology & Water Resources (AREA)
  • Analytical Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Dispersion Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Water Treatment By Sorption (AREA)
  • Carbon And Carbon Compounds (AREA)

Abstract

The invention discloses a preparation method based on a 3D printing graphene composite material and a device for purifying sewage. Two-layer jar body about setting up, the upper stirring can go on simultaneously with the filtration of lower floor for sewage treatment speed, the conical safety cover is equipped with on the filter screen of the jar body of lower floor, can effectively protect the graphite alkene 3D printing combined material on the filter screen can not be by the direct impact of the sewage of directly pouring into of the jar body of upper strata. The water discharge pipe is connected with a water pump, and the filtering speed of the lower tank body can be accelerated. A timing switch is arranged between the upper tank body and the lower tank body, after the upper-layer sewage is stirred for a certain time, the upper-layer sewage is automatically opened to enable the sewage after stirring reaction to enter the lower-layer tank body, the sewage is closed after all the sewage enters the lower-layer tank body for a certain time, and the upper-layer tank body is introduced into new sewage stirring reaction while the sewage in the lower-layer tank body is filtered.

Description

3D printing-based graphene composite material preparation method and sewage purification device
Technical Field
The invention belongs to the technical field of 3D printing materials, and particularly relates to a preparation method of graphene slurry and application of the graphene slurry in sewage purification.
Background
3D printing is today widely recognized as a revolutionary manufacturing technique, a new type of additive manufacturing process. The method can be based on software model design, utilizes a digital model and a technology of constructing a three-dimensional entity in a layered printing and layer-by-layer stacking accumulation mode, directly produces a three-dimensional object with any structure simply and quickly, and has important application prospect in various fields due to the flexibility provided by 3D printing.
Graphene is a material with a monolayer two-dimensional honeycomb lattice structure and carbon atoms which are tightly packed. The three-dimensional graphene has excellent electrical, optical and mechanical properties, high porosity, low density, high specific surface area, good electrical/thermal conductivity and other excellent properties, and thus has wide application prospects in various fields.
In sewage purification, the high specific surface area of graphene can be utilized for adsorbing organic pollutants in water, such as organic dyes, hydrocarbons, crude oil, pesticides and some natural organic substances. And 3D printing is combined with graphene, three-dimensional graphene with controllable structure and diversified shape can be easily obtained, and effective technical support is provided for realizing controllable preparation and design of the three-dimensional graphene and cutting design of the three-dimensional graphene and the composite material thereof. At present, preparation methods for preparing a three-dimensional graphene material by 3D printing, which have been put into practical use, are mainly an inkjet printing method, a direct writing forming method, a fused deposition forming method, and the like.
The 3D technology is that the prepared ink is loaded into an ink jet device, and is extruded out of a needle head along a designed path through computer/software control to be printed, and the ink is required to have good fluidity when passing through the needle head so as to ensure easy extrusion, and the ink has enough self-supporting capacity after being piled and formed so as to maintain the three-dimensional shape of the structure. At present, the research data for applying 3D printed graphene to sewage purification is not many, and the problems to be solved are how to ensure the successful printing of graphene 'ink', the water impact resistance of a graphene finished product in sewage treatment and the intact capability of the finished product under mutual collision, and that the graphene finished product cannot be dispersed or changed into the original graphene powder to cause secondary pollution after being soaked in sewage for a long time.
The sewage purification equipment is mainly used for purifying sewage to enable the sewage to be reused, not only protects the environment, but also saves water resources, and is widely applied to industries such as industrial production, sewage treatment and the like.
Disclosure of Invention
The invention provides a preparation method of a graphene 3D printing composite material and a device for purifying sewage by using the graphene 3D printing composite material.
A preparation method of a graphene composite material based on 3D printing comprises the following steps:
step 1, preparing a graphene 3D printing composite material:
adding 4g of graphene into 200ml of ethanol, adding 1g of ethylene glycol monobutyl ether for preventing the graphene from agglomerating, and carrying out ultrasonic treatment for 1 h; in order to ensure that the graphene ink has certain viscosity after ultrasonic treatment and ensure the subsequent printing forming, 3g of polyvinylpyrrolidone serving as a thickening agent is added, and ultrasonic treatment is carried out for 40 min; the mixed solution was heated in a water bath at 75 ℃ and stirred to remove most of the ethanol solution, so that the solution could not flow by its own weight after cooling.
Step 2.3D printing and forming:
and (4) drawing a three-dimensional graphene composite structure to be printed by software such as a computer 3Dmax and inputting the three-dimensional graphene composite structure into a 3D printer. And adding the prepared solution into a direct-writing 3D printer, and printing and forming.
It is preferable that: the graphene nanosheets in the step 1 are single-layer, few-layer or multi-layer.
It is preferable that: the air pressure used in the experiment is about 0 to 1MPa, the moving speed is about 5 to 15mm/s, and the shear rate is 10-1～10-3S-1。
It is preferable that: the diameters of the selected needles are 0.3-0.5mm respectively, the thickness of the layer is about 0.3-0.6 mm, and the gap distance is about 0.4-1.2 mm. Printed to a flat volume of about 2cm3。
It is preferable that: the mass ratio of graphene in the solution is 50 wt%, and the water bath heating time is 4-6 hours.
It is preferable that: and (5) carrying out freeze drying treatment for 24 h.
According to the preparation method of the 3D printing graphene-based composite material ink, the ink has the shear thinning characteristic, namely the viscosity of the slurry is reduced along with the increase of the shear rate, so that the slurry can be smoothly extruded from a needle opening, after the slurry is formed, the action of shear stress disappears, the viscosity of the slurry is recovered, and the printing structure can be kept stable.
This application utilizes graphite alkene 3D to print combined material through following sewage purification device and realizes sewage treatment, provides following technical scheme:
a sewage treatment device comprises a tank body, wherein the tank body is divided into an upper layer and a lower layer, and the bottoms of the upper tank body and the lower tank body are funnel-shaped; the upper end of the side wall of the upper tank body is provided with a water inlet, a stirrer is arranged in the upper tank body, and a stirring shaft is positioned in the center of the tank body and enters from the outside through the top of the upper tank body; the stirring shaft is provided with a stirring mechanism outside the tank body. A water outlet is arranged between the upper tank body and the lower tank body, and the upper sewage flows into the lower layer through the water outlet after being stirred.
Furthermore, an opening is reserved on the irrigation top and is connected with the outside.
Furthermore, a water outlet between the upper tank body and the lower tank body is automatically opened after the specified stirring time, and the water outlet is blocked by a circular baffle during stirring.
Furthermore, a timing switch is arranged at the circular baffle of the water outlet, and the two symmetrical edges of the circular baffle are connected with the timing switch through bolts.
Furthermore, the graphene composite material is placed in the upper-layer tank body, a grid is arranged at the water outlet, and the grid is fixed at the water outlet through bolts.
Further, there is a filter screen that above-mentioned graphite alkene combined material made bottom the lower floor's jar body, there is a conical safety cover filter screen top, four ends in safety cover bottom are supported by four hard PVC.
Furthermore, there is a drain pipe lower floor's jar body bottom, the bolt fastening is used to the filter screen the junction of drain pipe and the jar body, the drain pipe other end is connected with a water pump.
The invention has the following beneficial effects:
after the graphene composite material is added with the thickening agent and is printed through the direct-writing 3D printing, the finished product is convenient to recycle after adsorbing and purifying sewage. Two-layer jar body about setting up, the upper stirring can go on simultaneously with the filtration of lower floor for sewage treatment speed, the conical safety cover is equipped with on the filter screen of the jar body of lower floor, can effectively protect the graphite alkene 3D printing combined material on the filter screen can not be by the direct impact of the sewage of directly pouring into of the jar body of upper strata. The water discharge pipe is connected with a water pump, and the filtering speed of the lower tank body can be accelerated. A timing switch is arranged between the upper tank body and the lower tank body, after the upper-layer sewage is stirred for a certain time, the upper-layer sewage is automatically opened to enable the sewage after stirring reaction to enter the lower-layer tank body, the sewage is closed after all the sewage enters the lower-layer tank body for a certain time, and the upper-layer tank body is introduced into new sewage stirring reaction while the sewage in the lower-layer tank body is filtered. The grid in the middle of the upper tank body can prevent the graphene composite material on the upper layer from flowing into the lower layer along with sewage.
Drawings
FIG. 1 is a schematic structural diagram of a sewage purification apparatus provided in an embodiment of the present application;
FIG. 2 is a schematic structural diagram of a control baffle of a time switch according to an embodiment of the present disclosure;
fig. 3 is a diagram of odd layers of a 3D printed design of graphene provided in an embodiment of the present application;
fig. 4 is an even layer diagram of a graphene 3D printing design provided in an embodiment of the present application.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a detailed description of the present invention will be given below with reference to the accompanying drawings and specific embodiments. It should be understood that these examples are only for illustrating the present invention and are not intended to limit the scope of the present invention. In practice, the invention will be understood to cover all modifications and variations of this invention provided they come within the scope of the appended claims.
A preparation method of a graphene composite material based on 3D printing comprises the following steps:
first, configuring printing ink:
(1) taking 4g of graphene, 1g of ethylene glycol monobutyl ether and 200ml of ethanol solution in a beaker; the ethanol is anhydrous ethanol.
(2) Putting the mixed solution obtained in the step (1) into an ultrasonic device for ultrasonic treatment, wherein the ultrasonic power is 1000W, and the ultrasonic time is 1 h; after the ultrasound was finished, the mixture was allowed to stand for 5min, and then 3g of polyvinylpyrrolidone was added.
Putting the mixed solution obtained in the step (2) into an ultrasonic device for ultrasonic treatment, wherein the ultrasonic power is 1000W, and the ultrasonic time is 1 hour; standing for 5min after the ultrasound is finished, placing the beaker in a magnetic water bath stirrer, and keeping the temperature at 75 ℃ and the rotating speed at 300r/min until most of ethanol is evaporated, and the solution is pasty and can not freely flow under the action of gravity to obtain viscous high-concentration ink.
And step two, printing and forming:
and (4) filling the configured ink into a material cylinder of the 3D printer to prepare for printing.
(2) A corresponding printing model is designed through 3Dmax and other design software, such as a honeycomb cube with the volume of about 2cm3, and design data such as printing intervals are set.
Preferably, the pressure used in the experiment is about 0 to 1MPa, the moving speed is about 5 to 15mm/s, and the shearing rate is 10-1～10-3S-1. The diameters of the needles are 0.3-0.5mm respectively, the thickness of the layer is about 0.3-0.6 mm, and the gap distance is about 0.4-1.2 mm.
Step three, freeze drying treatment:
and placing the obtained printing structure in a freeze dryer for freeze drying for 24 hours to remove the solvent, so as to obtain the graphene composite aerogel.
Referring to fig. 1-4, for the graphene 3D printing composite material finished product, the macroscopic structure of the composite structure drawn by the software is a cube and is formed by stacking multiple layers, the bottom layer is designed as fig. 3, the upper layer is designed as fig. 4, the upper layer is designed as fig. 3, and the upper layer is still designed as fig. 3, and the cube is formed by stacking fig. 3 and fig. 4.
FIG. 1 is a device for adsorbing and purifying sewage by using the graphene composite material, which comprises a large tank body divided into an upper tank body 10 and a lower tank body 4, wherein a water inlet 6 enters from the upper end of the upper tank body 10, the tank body 10 is provided with a tank top, and the tank top is provided with a ventilation hole 18. Jar top center stretches into a puddler 8 from the external world, the puddler is equipped with the stirring leaf in the upper tank body, the upper tank body has highest water level line 9, the delivery port department of the upper tank body has bolted grid 16, there is the baffle 5 of timing switch 17 control under the grid, the bottom of upper pipe body 10 and the lower floor's jar body 4 all is for leaking hopper-shaped, the lower floor's jar body 4 has the filter screen 1 that an above-mentioned graphite alkene combined material made, filter screen 1 is with bolt fastening in lower floor's jar body bottom delivery port department, there is a conical safety cover 2 filter screen top, four ends of safety cover bottom symmetry are supported by four hard PVC 3. The upper end of the hard PVC3 is fixed with the round protective cover by bolts, and the lower end is fixed with the bottom of the tank body 10 by bolts. The water outlet is connected by 1 outlet pipe 15, the other end of outlet pipe 15 connects a water pump 11, the filtered water passes gate valve 14, and then passes filter 13, the water pump inlet pipe department is equipped with manometer 12.
The working principle is as follows: when the device is needed, firstly, sewage is injected into the tank body 10, the timing switch between the upper tank body 10 and the lower tank body 4 starts timing, the sewage injected into the tank body 10 cannot exceed the highest water level line 9, and the sewage cannot enter the water inlet pipe 6 during stirring. After the sewage is injected, the stirrer 8 stirs for two minutes, so that the sewage is fully contacted and adsorbed with the graphene composite material 7, the timing switch 17 is automatically opened after two minutes, the baffle 5 is enabled to move horizontally to open the water outlet, the sewage in the upper tank body 10 enters the lower tank body 4 through the grating 16, the sewage falls on the conical protective cover 2 and then flows down, is filtered by the graphene composite material filter screen 1, and is pumped out through the water outlet pipe 15 by the external water pump 11.
In the detailed diagram of the timing switch 17, after the timing device 19 finishes timing, the transmission shaft 20 transmits to the left, the connecting rods 21 and 22 are driven to move to the left, the baffle 5 and the connecting rods 21 and 22 are fixed by the bolt 23, the bolt 24, the bolt 25 and the bolt 26, and when the connecting rods move to the left, the baffles move together. And timing is finished after the water flow in the upper tank body flows into the lower tank body, the conveyor belt moves rightwards, the baffle blocks the water outlet again, and the water inlet pipe enters water again.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims (10)

1. A preparation method of a graphene composite material based on 3D printing is characterized by comprising the following steps:
(1) adding graphene and a surfactant into ethanol, and performing ultrasonic treatment for 1 hour to obtain a uniformly dispersed graphene suspension; then adding a thickening agent into the mixed solution, and carrying out ultrasonic treatment for 40 minutes to obtain a graphene dispersed mixed solution; heating the solution in a water bath at 75 ℃ for 4-6 hours, stirring and evaporating, and removing a large amount of ethanol until the slurry is pasty;
(2) three-dimensional modeling of the 3D printer: drawing a three-dimensional graphene composite structure to be printed, and inputting the three-dimensional graphene composite structure into a 3D printer;
(3)3D printing of the graphene composite material: adding the pasty slurry prepared in the step (1) into a 3D printer, and printing a graphene composite material finished product by using direct writing 3D;
(4) and (4) carrying out freeze drying treatment on the printed finished product for 24 hours by using a freeze dryer to obtain the three-dimensional graphene material.
2. The preparation method of the graphene composite material based on 3D printing according to claim 1, wherein the thickener is polyvinylpyrrolidone, and the surfactant is ethylene glycol monobutyl ether.
3. The preparation method of the graphene composite material based on 3D printing according to claim 2, wherein the weight ratio of the raw materials in the step (2) is graphene: ethylene glycol monobutyl ether: polyvinylpyrrolidone ═ 4: 1: and 3, the mass ratio of the graphene in the solution is 50 wt%.
4. The preparation method of the graphene composite material based on 3D printing according to claim 1, wherein the preparation method comprises the following steps: the air pressure used in the step (3) is 0-1 MPa, the moving speed is 5-15mm/s, and the shearing rate is 10-1～10-3S-1。
5. The preparation method of the graphene composite material based on 3D printing according to claim 1, wherein the preparation method comprises the following steps: the graphene nanosheets in the step (1) are single-layer, few-layer or multi-layer.
6. The preparation method of the graphene composite material based on 3D printing according to claim 1, wherein the preparation method comprises the following steps: the diameter of the selected needle head is 0.3-0.5mm, the thickness of the layer is 0.3-0.6 mm, and the gap distance is 0.4-1.2 mm; printed to a flat volume of 2 cubic centimeters.
7. The sewage purification device based on the 3D printing graphene composite material is characterized by comprising a large tank body which is divided into an upper tank body (10) and a lower tank body (4), wherein a water inlet (6) is formed in the upper end of the upper tank body (10), and a water outlet pipe (15) is formed in the bottom of the lower tank body (4); a stirrer (8) is arranged at the center of the upper tank body (10), slowly stirred, and a graphene 3D printing composite material (7) is placed in the stirrer and used as an adsorbent for treating sewage; the bottoms of the lower tank body (4) and the upper tank body (10) are funnel-shaped, a grid (16) fixed by bolts is arranged at a water outlet of the upper tank body, and the gap between the grids (16) is 0.8-1.0 cm; a baffle (5) controlled by a timing switch (17) is arranged below the grating (16); the bottom of the lower tank body (4) is provided with a layer of filter screen (1) which is formed by fixing a graphene 3D printing composite material at the joint of the water outlet pipe (15), a conical protective cover (2) is arranged above the filter screen (1), and four symmetrical ends at the bottom of the protective cover (2) are supported by four hard PVC (3).
8. The device for purifying sewage based on 3D printing of graphene composite material according to claim 7, wherein the timing switch (17) comprises a timing device (19), a transmission shaft (20), connecting rods (21, 22) and bolts (23, 24, 25, 26), after the timing device (19) stirs and counts the time, the transmission shaft (20) transmits to the left, the connecting rods (21, 22) are driven to move to the left, the baffle (5) and the connecting rods (21, 22) are fixed by the bolts (23, 24, 25, 26), and when the connecting rods (21, 22) move to the left, the baffle (5) moves together; the timing is finished after the water flow in the upper tank body flows into the lower tank body, the conveyor belt moves rightwards, the baffle (5) blocks the water outlet again, and the water inlet pipe enters water again.
9. The sewage purification device based on 3D printing of graphene composite material according to claim 7, wherein the other end of the water outlet pipe (15) is connected with a water pump (11), the filtered water passes through a gate valve (14) and then a filter (13), and a pressure gauge (12) is installed at the water inlet pipe of the water pump.
10. A purification method of the sewage purification apparatus according to claim 7, characterized in that: the method comprises the following steps:
step 1: injecting sewage into the upper tank body, and stirring to enable the sewage to be in full contact reaction with the graphene composite material;
step 2: opening a water outlet in the middle of the upper tank body and the lower tank body, and enabling the sewage after stirring reaction to flow into the lower tank body;
and step 3: and after the sewage after reaction is filtered by the graphene composite material filter screen of the lower tank body, the sewage is discharged through a water outlet pipe.
CN202011337222.4A 2020-11-25 2020-11-25 3D printing-based graphene composite material preparation method and sewage purification device Pending CN112337434A (en)

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CN108046241A (en) * 2017-12-18 2018-05-18 苏州大学 A kind of 3D printing surpasses the method for poroelasticity graphene aerogel
CN109896519A (en) * 2019-03-18 2019-06-18 华东理工大学 A kind of quick controllable method for preparing of three-dimensional grapheme microballoon for absorption
CN110143637A (en) * 2019-05-08 2019-08-20 安徽双鹿车业有限公司 A kind of device with graphene powder processing plastics waste water
CN211035491U (en) * 2019-10-09 2020-07-17 湖南双富新材料科技有限公司 Sewage purification device is used in manganese precursor processing
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CN110143637A (en) * 2019-05-08 2019-08-20 安徽双鹿车业有限公司 A kind of device with graphene powder processing plastics waste water
CN211035491U (en) * 2019-10-09 2020-07-17 湖南双富新材料科技有限公司 Sewage purification device is used in manganese precursor processing
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Application publication date: 20210209