CN111285429A - Low-transmittance sewage photocatalytic treatment composite board and preparation method thereof - Google Patents
Low-transmittance sewage photocatalytic treatment composite board and preparation method thereof Download PDFInfo
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- CN111285429A CN111285429A CN202010132699.2A CN202010132699A CN111285429A CN 111285429 A CN111285429 A CN 111285429A CN 202010132699 A CN202010132699 A CN 202010132699A CN 111285429 A CN111285429 A CN 111285429A
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- light
- sewage
- photocatalyst particles
- transmitting substrate
- photocatalyst
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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
- C02F1/30—Treatment of water, waste water, or sewage by irradiation
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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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/725—Treatment of water, waste water, or sewage by oxidation by catalytic oxidation
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/308—Dyes; Colorants; Fluorescent agents
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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
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/10—Photocatalysts
Abstract
The invention relates to a low-transmittance sewage photocatalytic treatment composite board and a preparation method thereof, belonging to the technical field of sewage treatment. The composite board comprises a light-transmitting substrate board and photocatalyst particles on the surface of the light-transmitting substrate board, wherein the light-transmitting substrate board is of a boat-shaped structure, and the photocatalyst particles are fixed on the outer side of the bottom surface of the light-transmitting substrate board through a waterproof transparent double-sided adhesive tape; the composite board is prepared by the following steps: and adhering one adhesive surface of the waterproof transparent double-sided tape to the outer side of the bottom surface of the transparent base material, smearing photocatalyst particles on the other adhesive surface of the waterproof transparent double-sided tape, and performing ultrasonic vibration treatment to remove the photocatalyst particles which are not firmly adhered. The composite plate provided by the invention floats on the sewage liquid level, and the bottom of the composite plate is bonded with photocatalyst particles, incident light directly penetrates through the light-transmitting substrate plate to be contacted with the photocatalyst particles, so that the composite plate is not influenced by the transparency of sewage, the loss of illumination intensity is small, the reaction speed is high, and the composite plate is suitable for treating sewage with low transparency; the photocatalyst is fixed by the waterproof transparent double-sided adhesive tape, and the preparation method is simple.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to a low-transmittance sewage photocatalytic treatment composite board and a preparation method thereof.
Background
The photocatalytic oxidation technology is one of the advanced oxidation methods, and the principle is that the photocatalyst generates photo-generated electrons-holes under the light irradiationAnd the intermediate active substances such as hydroxyl free radicals, superoxide free radicals and the like with strong oxidizability are further generated under the action of dissolved oxygen or water molecules in water, and pollutant molecules can be thoroughly oxidized. However, in the practical application of photocatalytic water treatment, the photocatalyst in the form of particles or powder is very easy to settle in water and is lost with the washing or flowing of sewage, so that it needs to be fixed, and chinese application CN201810436343.0 discloses a membrane plate for photocatalytic degradation and catalysis of phenol pollutants in sewage, which is a photocatalyst TiO membrane plate2The hybrid film is fixedly carried in the hybrid film and is adhered to a glass slide with a point to form a film plate, the hybrid film is immersed in sewage when in use, the loss of the photocatalyst is greatly reduced, but the hybrid film is inconvenient to use in sewage with low transmittance, when pollutants or suspended silt in the sewage have high concentration and shield incident light, the transmittance of the sewage is greatly reduced, in order to improve the illumination intensity at the film plate to ensure the reaction rate, the light intensity of a light source needs to be improved or the film plate is adjusted according to the liquid level change of a sewage pool to be close to the liquid level, the energy consumption of the former is increased, and the latter is complex to operate.
Disclosure of Invention
Aiming at the problems, the invention aims to provide a low-transmittance sewage photocatalytic treatment composite board, which can treat low-transmittance sewage by means of photodegradation catalysis, and the invention realizes the purposes by the following technical scheme:
a low-light-transmittance sewage photocatalytic treatment composite plate comprises a light-transmitting base material plate and photocatalyst particles, wherein the light-transmitting base material plate is of a ship-shaped structure, such as a transparent culture dish, and can float on a liquid level and automatically adjust the position of the light-transmitting base material plate along with the change of the liquid level in a sewage pool; meanwhile, photocatalyst particles are adhered to the outer side of the bottom surface of the transparent substrate plate through a waterproof transparent double-sided tape, and the selected waterproof transparent double-sided tape needs to have a strong adhesion effect, such as a 3M-VHB waterproof transparent double-sided tape.
After the composite plate is put into sewage, the transparent substrate plate floats on the liquid level, photocatalyst particles outside the bottom of the transparent substrate plate are immersed in the sewage, and light energy is radiated to a photocatalyst which is fixed on the bottom surface of the substrate and is in contact with the sewage through the transparent substrate plate to induce photocatalytic oxidation reaction to play the photocatalytic degradation effect.
The invention also aims to provide a preparation method of the low-transmittance sewage photocatalytic treatment composite board, which fixes the photocatalyst on the bottom surface of the light-transmitting substrate board through the waterproof transparent double-sided adhesive tape, and has the advantages of simple operation and the following specific scheme:
a1, sticking a waterproof transparent double-sided tape adhesive surface on the outer side of the bottom surface of the boat-shaped structure of the light-transmitting substrate plate; the adhesive tape is required to be smooth in the pasting process, and air holes are prevented from being formed between the adhesive tape and the light-transmitting base material plate.
A2, coating photocatalyst particles on the other adhesive surface of the waterproof transparent double-sided tape; the coating is as uniform as possible, and the coating is stopped until the adhesive surface loses viscosity in order to fully utilize the surface of the adhesive tape.
A3, immersing the coated composite board in water, and carrying out ultrasonic vibration treatment to remove the photocatalyst particles which are not firmly bonded until no obvious photocatalyst particles fall off, wherein the preferable ultrasonic vibration treatment time is not less than 5 minutes.
It is worth mentioning that the photocatalyst particles can be stacked layer by layer in the smearing process, but the adhesive tape can only stably fix the layer of photocatalyst particles which is in direct contact with the adhesive tape, and under the ultrasonic condition, the infirm photocatalyst particle layer can be removed, and finally only one photocatalyst particle layer is remained, so that the transmission path of the photo-generated carriers from the upper part of the photocatalyst layer to the lower part of the photocatalyst which is in contact with the water body can be reduced.
Compared with the prior art, the invention has the following beneficial effects:
the composite plate provided by the invention floats on the sewage liquid level, and the bottom of the composite plate is bonded with photocatalyst particles, incident light directly penetrates through the light-transmitting substrate plate to be contacted with the photocatalyst particles, so that the composite plate is not influenced by the transparency of sewage, the loss of illumination intensity is small, the reaction speed is high, and the composite plate is suitable for treating sewage with low transparency; the photocatalyst is fixed by the waterproof transparent double-sided adhesive tape, so that the falling loss of the photocatalyst is reduced, and the preparation method is relatively simple.
Drawings
FIG. 1 is a schematic diagram of a structure of a photocatalytic treatment composite board.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments of the present invention, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The low-transmittance sewage photocatalytic treatment composite boards in the following examples 1 and 2 are prepared in the following ways:
(1) a transparent plastic culture dish with a diameter of 5cm is selected, and the culture dish can float on the water surface.
(2) And cleaning the outer side of the bottom of the culture dish, drying, and flatly sticking a 3M-VHB waterproof transparent double-sided adhesive tape.
(3) And spreading the photocatalyst particles on the surface of the adhered double-sided adhesive tape, and uniformly coating until the adhesive surface loses viscosity.
(4) And immersing the composite board in water for ultrasonic vibration treatment for 5min, and removing the photocatalyst layer which is not stably fixed to obtain the final photocatalytic treatment composite board, wherein the structure of the composite board is shown in figure 1.
Carrying out light transmittance test on the culture dish stuck with the waterproof transparent double-sided adhesive tape prepared in the step (2), wherein the result shows that the light transmittance of the bottom surface of the culture dish is more than 91%; performing stability test on the photocatalytic treatment composite board prepared in the step (4), namely selecting ultrasonic vibration treatment again, and finding that no photocatalyst particles fall off even after ultrasonic vibration for more than 10 min; meanwhile, a common adhesive tape (Deli-331) is used for carrying out an adhesion test on the photocatalyst particles fixed on the 3M-VHB waterproof transparent adhesive tape, and after multiple times of adhesion, the photocatalyst particles are not obviously fallen off; the tests show that the photocatalyst layer of the photocatalytic composite board disclosed by the invention is very stable and is not easy to fall off.
Example 1
Titanium dioxide particles are used as a photocatalyst, and the titanium dioxide photocatalytic treatment composite board is prepared according to the method. The amount of fixed photocatalyst was measured by differential weight method to be 0.008g, the photocatalytically treated composite plate was placed on 100ml of 10ppm of light fast black dye solution, and a 50W xenon lamp-effect radiation source was provided above the petri dish. The degradation rate of the sunproof black dye solution after 12h is 49.9%.
The sunless tanning solution has a complex material structure and is not easy to degrade, and light in the wavelength range of 190 nm-700 nm is absorbed, so that the light transmittance is low. Under the same condition, the same amount of photocatalyst is directly dispersed in the same sunproof black solution by adopting a traditional suspension type degradation mode, the xenon lamp is also used as a light source, and the degradation rate of the sunproof black dye is only 11.4% after 12 h.
Therefore, compared with the traditional suspension degradation mode, the titanium dioxide particles are photocatalyst which is positioned on the liquid surface and are not influenced by the light absorption effect of the polluted substance molecules, so that the degradation rate is obviously higher.
Example 2
And preparing the graphite-phase carbon nitride photocatalytic treatment composite board by using the graphite-phase carbon nitride as a photocatalyst according to the method. The prepared photocatalytic treatment composite board and the traditional suspension type mode are respectively used for treating 100ml of rhodamine B solution containing no quartz sand and rhodamine B solution containing quartz sand (the condition that the quartz sand is added to simulate the existence of silt in sewage, the solution is stirred and then starts an experiment), a 50W xenon lamp is provided as a radiation light source, and the degradation rate of the radiation light source after 1 hour is tested, particularly, the fixed amount of the photocatalyst of the photocatalytic composite board in the experiment is 0.006g and is far less than the added amount (0.04g) of the photocatalyst coal in the suspension type degradation mode, because in the traditional suspension type degradation mode, when the added amount is 0.006g, the degradation rate is lower than 10%, and the dye concentration test is easily influenced by system errors. The specific experimental results are as follows:
| serial number | Item | Rate of degradation |
| 1 | Photocatalytic treatment composite board and rhodamine B solution without quartz sand | 23.3％ |
| 2 | Photocatalytic treatment composite board and rhodamine B solution containing quartz sand | 22.9％ |
| 3 | Traditional suspension type mode + rhodamine B solution without quartz sand | 73.1％ |
| 4 | Traditional suspension type mode + rhodamine B solution containing quartz sand | 55.4％ |
From the above table, it can be seen that, in the conventional suspension type experiment, after the quartz sand is added, the degradation rate after one hour is reduced from 73.1% to 55.4%, which is due to the decrease of light absorption of photocatalyst particles caused by the shielding of part of the photocatalyst by the quartz sand in water; when the method for degrading the composite plate by photocatalytic treatment provided by the invention is utilized, the mixing of quartz sand or not has almost no influence on the photocatalytic degradation of rhodamine B, and the method provided by the invention can remove the shielding effect of silt on photocatalyst in the actual photocatalytic degradation.
The foregoing shows and describes the general principles and features of the present invention, together with the advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (4)
1. A low-transmittance sewage photocatalytic treatment composite board comprises a light-transmitting substrate board and photocatalyst particles on the surface of the light-transmitting substrate board, and is characterized in that the light-transmitting substrate board is of a ship-shaped structure and can float on the sewage liquid level; and a waterproof transparent double-sided adhesive tape is arranged between the outer side of the bottom surface of the light-transmitting substrate plate and the photocatalyst particles and is used for fixing the photocatalyst particles on the surface of the light-transmitting substrate plate.
2. The composite plate for photocatalytic treatment of low-transmittance sewage according to claim 1, wherein the transparent substrate plate is a transparent petri dish, and the waterproof transparent double-sided adhesive tape is 3M-VHB waterproof transparent double-sided adhesive tape.
3. A method for preparing the low-transmittance sewage photocatalytic treatment composite board according to claim 1, comprising the following steps:
a1, sticking a waterproof transparent double-sided tape adhesive surface on the outer side of the bottom surface of the light-transmitting substrate plate;
a2, coating photocatalyst particles on the other adhesive surface of the waterproof transparent double-sided tape;
a3, immersing the photocatalyst particles in water, and performing ultrasonic vibration treatment to remove the weakly bonded photocatalyst particles.
4. The method for preparing the low-transmittance sewage photocatalytic treatment composite board according to claim 3, wherein the ultrasonic vibration treatment time in the step A3 is not less than 5 min.
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