CN109876868B - Preparation method of porous photocatalyst for wastewater treatment - Google Patents
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- 238000004065 wastewater treatment Methods 0.000 title claims abstract description 23
- 238000002360 preparation method Methods 0.000 title claims abstract description 10
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims abstract description 60
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- 238000000034 method Methods 0.000 claims abstract description 32
- 239000004408 titanium dioxide Substances 0.000 claims abstract description 30
- QHGJSLXSVXVKHZ-UHFFFAOYSA-N dilithium;dioxido(dioxo)manganese Chemical compound [Li+].[Li+].[O-][Mn]([O-])(=O)=O QHGJSLXSVXVKHZ-UHFFFAOYSA-N 0.000 claims abstract description 24
- KDHWOCLBMVSZPG-UHFFFAOYSA-N 3-imidazol-1-ylpropan-1-amine Chemical compound NCCCN1C=CN=C1 KDHWOCLBMVSZPG-UHFFFAOYSA-N 0.000 claims abstract description 17
- SSJXIUAHEKJCMH-UHFFFAOYSA-N cyclohexane-1,2-diamine Chemical compound NC1CCCCC1N SSJXIUAHEKJCMH-UHFFFAOYSA-N 0.000 claims abstract description 17
- 239000000203 mixture Substances 0.000 claims description 106
- 238000003756 stirring Methods 0.000 claims description 33
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 18
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- 229940080264 sodium dodecylbenzenesulfonate Drugs 0.000 claims description 13
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Abstract
The invention provides a preparation method of a porous photocatalyst for wastewater treatment, which adopts a two-step method to prepare the porous photocatalyst, adopts a ternary catalytic system formed by compounding titanium dioxide, barium oxide and lithium manganate, controls the proportion of the titanium dioxide, the barium oxide and the lithium manganate to be 60-80:25-40:1-5, and selects 1, 2-diaminocyclohexane and 1- (3-aminopropyl) imidazole to be compounded as curing components.
Description
Technical Field
The invention relates to a photocatalyst for wastewater treatment, in particular to a preparation method of a porous photocatalyst for wastewater treatment.
Background
In reality, the common treatment methods for sewage comprise a mechanical separation method, a physical method, a chemical method, a physical-chemical method, a biological method and the like, and the prior art discloses a ship body capable of floating on the water surface and efficiently cleaning oil and organic pollutants. For example, the mechanical separation method, chinese patent application No. 2013102192711, discloses a continuous liftable caterpillar fast oil absorption device, which realizes the lifting of caterpillar by a lever system to ensure the sufficient contact between the oil absorption material and the liquid level, but it is inconvenient in the practical operation process. Meanwhile, the device does not realize real oil-water separation, so that the subsequent oil-water separation is difficult, the treatment cost of the oily sewage is further increased, and the efficient treatment of oil pollutants cannot be realized.
Patent application with publication number CN107556772A discloses a novel straw oil absorption material, which comprises straw, foaming agent, foam stabilizer, initiator, catalyst, and polycarbonate. The fertilizer adopts crops as raw materials, has low cost and good application value and popularization prospect. Simultaneously has good biodegradability and environmental friendliness. The oil-absorbing material can be foamed and formed on site in oil spilling, is convenient to transport, and can greatly reduce storage and transport space compared with the existing oil-absorbing material. The forming process is simple, the investment is low, the production efficiency is high, and the method is particularly suitable for emergency treatment of oil spills on water surfaces of rivers, lakes and seas. However, the material has strong water absorption, the oil absorption performance of the material is greatly reduced when the material meets oil with high viscosity, and meanwhile, the material does not consider the situation of subsequent recycling, so that the actual use cost of the material is increased.
The photocatalysis method for treating sewage in environment is a method which is widely concerned in recent years, has low cost and can not cause secondary pollution, organic molecules in the sewage are decomposed into inorganic micromolecules after light radiation, a light source used in the photocatalysis process can be a natural light source or an artificial light source, a catalyst commonly used in the current photocatalysis method is titanium dioxide, under the condition of illumination, an electron-hole pair is excited to generate, oxygen, water molecules and the like adsorbed on the catalyst react with the electron-hole pair to generate free radicals with strong oxidizability, and then the free radicals react with pollutants in the sewage to finally generate micromolecules such as carbon dioxide, water and the like or chloride ions, nitrate ions, sulfate ions and the like. However, the single titanium dioxide is not suitable for direct use, and the catalytic efficiency of the single titanium dioxide is limited.
The invention provides a preparation method of a porous photocatalyst for wastewater treatment, which adopts a two-step method to prepare the porous photocatalyst, and the photocatalytic efficiency in wastewater is greatly improved.
Disclosure of Invention
The invention provides a preparation method of a porous photocatalyst for wastewater treatment, which adopts a two-step method to prepare the porous photocatalyst, adopts a ternary catalytic system formed by compounding titanium dioxide, barium oxide and lithium manganate, controls the proportion of the titanium dioxide, the barium oxide and the lithium manganate to be 60-80:25-40:1-5, and adopts 1, 2-diaminocyclohexane and 1- (3-aminopropyl) imidazole to be compounded as curing components.
A preparation method of a porous photocatalyst for wastewater treatment is characterized by being prepared by a two-step method and specifically comprising the following steps:
step one, adding 60-80 parts of titanium dioxide, 25-40 parts of barium oxide, 1-5 parts of lithium manganate and 5-10 parts of sodium dodecyl benzene sulfonate into 150 parts of acetone by weight, stirring and ultrasonically dispersing for 1-2 hours to form a mixture A for later use;
adding 50-80 parts by weight of bisphenol A type epoxy resin, 2-3 parts by weight of 1, 2-diaminocyclohexane and 0.5-1 part by weight of 1- (3-aminopropyl) imidazole into 100 parts by weight of liquid polyethylene glycol, and uniformly stirring and dispersing at 30-40 ℃ to form a mixture B for later use;
step three, adding 30-40 parts by weight of the mixture A in the step one into 60-100 parts by weight of the mixture B in the step two, stirring and ultrasonically dispersing for 1-2 hours at 30-40 ℃, then raising the temperature to 70-75 ℃, and keeping the temperature for 30-60 minutes;
step four, based on 100 parts of the total weight of the mixture A and the mixture B added in the step three, slowly adding 5-10 parts of the mixture A in the step one into the mixture which is finally kept for 30-60 minutes in the step three again, raising the temperature to 80-90 ℃, and keeping the temperature for 1-2 hours;
and step five, cooling and filtering the product obtained in the step four, sequentially washing the product with absolute ethyl alcohol and deionized water, and drying the product to obtain the porous photocatalyst.
In the first step, the content of titanium dioxide is preferably 65 parts, the content of barium oxide is preferably 25 parts, the content of lithium manganate is preferably 3 parts, and the content of sodium dodecyl benzene sulfonate is preferably 10 parts.
The softening point of the bisphenol A type epoxy resin in the second step is below 30 ℃.
The average molecular weight of the liquid polyethylene glycol is less than about 600, and PEG-200, PEG-300, PEG-400, PEG-600 and the like are more preferable.
Preferably, the bisphenol A epoxy resin is 80 parts, 1, 2-diaminocyclohexane is 3 parts, and 1- (3-aminopropyl) imidazole is 1 part.
Preferably, the titanium dioxide in the first step is nano-scale titanium dioxide.
Preferably, the mixture A in the third step is 30 parts, and the mixture B in the third step is 70 parts.
Preferably, the mixture a added again in step four is preferably 7 parts.
And the porous photocatalyst obtained in the fifth step is nano-scale particles.
The invention also provides a porous photocatalyst for wastewater treatment, which is characterized in that the porous photocatalyst is prepared by the preparation method provided by the invention.
Compared with the prior art, the invention has the following advantages:
1. the invention adopts a two-step method to prepare the photocatalyst, and compared with a method of adding all raw materials by a one-step method, the two-step method obtains the catalyst with better photocatalytic effect;
2. according to the invention, a ternary catalysis system formed by compounding titanium dioxide, barium oxide and lithium manganate is adopted, the ratio of the titanium dioxide to the barium oxide to the lithium manganate is strictly controlled to be 60-80:25-40:1-5, a synergistic catalysis effect is exerted, compared with the technical scheme of compounding single titanium dioxide or two of the titanium dioxide and the lithium manganate, the ternary compounding according to a specific ratio obtains an unexpected catalysis effect, the wastewater treatment capability is improved, and particularly, when the content of lithium manganate is too high or too low, the promotion of the catalysis effect is not facilitated.
3. The invention selects the 1, 2-diaminocyclohexane and 1- (3-aminopropyl) imidazole to be compounded as curing components, and the curing components are added according to the proportion of 2-3:0.5-1, so that the photocatalysis effect is further improved, and the invention belongs to one of the invention points.
4. The other invention of the invention is characterized in that in the first step, 30-40 parts of the mixture A is added into 60-100 parts of the mixture B to react for a certain time at a specific temperature; secondly, adding a certain amount of the mixture A, increasing the temperature, and reacting for a certain time again. The two-step process has substantial influence on the catalytic efficiency, and greatly improves the photocatalytic efficiency during wastewater treatment.
In the two-step method of the present invention, the amount of the mixture a added in the second step should be small, specifically, the amount should be 5 to 10 parts by weight relative to 100 parts by weight of the total weight of the mixture a and the mixture B, and experiments show that when the amount is too high, the catalytic efficiency is reduced, and when the amount is too low, the effective effect cannot be improved.
The invention provides a preparation method of a porous photocatalyst for wastewater treatment, which adopts a two-step method to prepare the porous photocatalyst, adopts a ternary catalytic system formed by compounding titanium dioxide, barium oxide and lithium manganate, controls the proportion of the titanium dioxide, the barium oxide and the lithium manganate to be 60-80:25-40:1-5, and adopts 1, 2-diaminocyclohexane and 1- (3-aminopropyl) imidazole to be compounded as curing components.
Detailed Description
The types of the raw materials used in different examples and the same component in the comparative example are the same, other process conditions or operations which are not described are the same, and technical characteristics which are not further limited are the same.
Example 1
A porous photocatalyst for wastewater treatment is prepared by the following steps:
adding 80 parts by weight of titanium dioxide, 25 parts by weight of barium oxide, 1 part by weight of lithium manganate and 6 parts by weight of sodium dodecyl benzene sulfonate into 100 parts by weight of acetone, stirring and ultrasonically dispersing for 1 hour to form a mixture A for later use;
adding 50 parts by weight of bisphenol A epoxy resin, 3 parts by weight of 1, 2-diaminocyclohexane and 1 part by weight of 1- (3-aminopropyl) imidazole into 100 parts by weight of liquid polyethylene glycol, and uniformly stirring and dispersing at 40 ℃ to form a mixture B for later use;
step three, adding 40 parts by weight of the mixture A in the step one into 60 parts by weight of the mixture B in the step two, stirring and ultrasonically dispersing for 2 hours at 40 ℃, and then raising the temperature to 75 ℃ and keeping for 60 minutes;
step four, slowly adding 10 parts of the mixture A in the step one into the mixture which is finally kept for 60 minutes in the step three again, and raising the temperature to 90 ℃ for 2 hours, wherein the total weight of the mixture A and the mixture B added in the step three is 100 parts;
and step five, cooling and filtering the product obtained in the step four, sequentially washing the product with absolute ethyl alcohol and deionized water, and drying the product to obtain the porous photocatalyst.
100mg of the prepared porous photocatalyst is added into 100mL of methylene blue wastewater with the concentration of 50mg/L, the mixture is irradiated for 1 hour under a 350w mercury lamp light source, and the degradation rate of residual methylene blue is 97.3 percent by using ultraviolet-visible absorption spectrum detection.
Example 2
A porous photocatalyst for wastewater treatment is prepared by the following steps:
step one, adding 65 parts of titanium dioxide, 25 parts of barium oxide, 3 parts of lithium manganate and 10 parts of sodium dodecyl benzene sulfonate into 150 parts of acetone by weight, stirring and ultrasonically dispersing for 2 hours to form a mixture A for later use;
adding 80 parts by weight of bisphenol A epoxy resin, 3 parts by weight of 1, 2-diaminocyclohexane and 1 part by weight of 1- (3-aminopropyl) imidazole into 100 parts by weight of liquid polyethylene glycol, and uniformly stirring and dispersing at 40 ℃ to form a mixture B for later use;
step three, adding 30 parts by weight of the mixture A in the step one into 70 parts by weight of the mixture B in the step two, stirring and ultrasonically dispersing for 2 hours at 40 ℃, and then raising the temperature to 75 ℃ and keeping for 60 minutes;
step four, based on the total weight of the mixture A and the mixture B added in the step three as 100 parts, adding 7 parts of the mixture A in the step one into the mixture which is finally kept for 60 minutes in the step three slowly, raising the temperature to 90 ℃, and keeping the temperature for 2 hours;
and step five, cooling and filtering the product obtained in the step four, sequentially washing the product with absolute ethyl alcohol and deionized water, and drying the product to obtain the porous photocatalyst.
100mg of the prepared porous photocatalyst is added into 100mL of methylene blue wastewater with the concentration of 50mg/L, the mixture is irradiated for 1 hour under a 350w mercury lamp light source, and the degradation rate of residual methylene blue is 99.2 percent by using ultraviolet-visible absorption spectrum detection.
Comparative example 1
A porous photocatalyst for wastewater treatment is prepared by the following steps:
step one, adding 65 parts of titanium dioxide, 25 parts of barium oxide, 3 parts of lithium manganate and 10 parts of sodium dodecyl benzene sulfonate into 150 parts of acetone by weight, stirring and ultrasonically dispersing for 2 hours to form a mixture A for later use;
adding 80 parts by weight of bisphenol A epoxy resin, 3 parts by weight of 1, 2-diaminocyclohexane and 1 part by weight of 1- (3-aminopropyl) imidazole into 100 parts by weight of liquid polyethylene glycol, and uniformly stirring and dispersing at 40 ℃ to form a mixture B for later use;
step three, adding 37 parts by weight of the mixture A in the step one into 70 parts by weight of the mixture B in the step two, stirring and ultrasonically dispersing for 2 hours at 40 ℃, and then raising the temperature to 90 ℃ and keeping for 3 hours;
and step four, cooling and filtering the product obtained in the step three, sequentially washing the product with absolute ethyl alcohol and deionized water, and drying the product to obtain the porous photocatalyst.
100mg of the prepared porous photocatalyst is added into 100mL of methylene blue wastewater with the concentration of 50mg/L, the mixture is irradiated for 1 hour under a 350w mercury lamp light source, and the degradation rate of residual methylene blue is 77.6 percent by using ultraviolet-visible absorption spectrum detection.
Comparative example 2
A porous photocatalyst for wastewater treatment is prepared by the following steps:
step one, adding 65 parts of titanium dioxide, 25 parts of barium oxide, 20 parts of lithium manganate and 10 parts of sodium dodecyl benzene sulfonate into 150 parts of acetone by weight, stirring and ultrasonically dispersing for 2 hours to form a mixture A for later use;
adding 80 parts by weight of bisphenol A epoxy resin, 3 parts by weight of 1, 2-diaminocyclohexane and 1 part by weight of 1- (3-aminopropyl) imidazole into 100 parts by weight of liquid polyethylene glycol, and uniformly stirring and dispersing at 40 ℃ to form a mixture B for later use;
step three, adding 30 parts by weight of the mixture A in the step one into 70 parts by weight of the mixture B in the step two, stirring and ultrasonically dispersing for 2 hours at 40 ℃, and then raising the temperature to 75 ℃ and keeping for 60 minutes;
step four, based on the total weight of the mixture A and the mixture B added in the step three as 100 parts, adding 7 parts of the mixture A in the step one into the mixture which is finally kept for 60 minutes in the step three slowly, raising the temperature to 90 ℃, and keeping the temperature for 2 hours;
and step five, cooling and filtering the product obtained in the step four, sequentially washing the product with absolute ethyl alcohol and deionized water, and drying the product to obtain the porous photocatalyst.
100mg of the prepared porous photocatalyst is added into 100mL of methylene blue wastewater with the concentration of 50mg/L, the mixture is irradiated for 1 hour under a 350w mercury lamp light source, and the degradation rate of residual methylene blue is 81.4 percent by using ultraviolet-visible absorption spectrum detection.
Comparative example 3
A porous photocatalyst for wastewater treatment is prepared by the following steps:
step one, adding 65 parts of titanium dioxide, 25 parts of barium oxide, 0.1 part of lithium manganate and 10 parts of sodium dodecyl benzene sulfonate into 150 parts of acetone by weight, stirring and ultrasonically dispersing for 2 hours to form a mixture A for later use;
adding 80 parts by weight of bisphenol A epoxy resin, 3 parts by weight of 1, 2-diaminocyclohexane and 1 part by weight of 1- (3-aminopropyl) imidazole into 100 parts by weight of liquid polyethylene glycol, and uniformly stirring and dispersing at 40 ℃ to form a mixture B for later use;
step three, adding 30 parts by weight of the mixture A in the step one into 70 parts by weight of the mixture B in the step two, stirring and ultrasonically dispersing for 2 hours at 40 ℃, and then raising the temperature to 75 ℃ and keeping for 60 minutes;
step four, based on the total weight of the mixture A and the mixture B added in the step three as 100 parts, adding 7 parts of the mixture A in the step one into the mixture which is finally kept for 60 minutes in the step three slowly, raising the temperature to 90 ℃, and keeping the temperature for 2 hours;
and step five, cooling and filtering the product obtained in the step four, sequentially washing the product with absolute ethyl alcohol and deionized water, and drying the product to obtain the porous photocatalyst.
100mg of the prepared porous photocatalyst is added into 100mL of methylene blue wastewater with the concentration of 50mg/L, the mixture is irradiated for 1 hour under a 350w mercury lamp light source, and the degradation rate of residual methylene blue is 75.9 percent by using ultraviolet-visible absorption spectrum detection.
Comparative example 4
A porous photocatalyst for wastewater treatment is prepared by the following steps:
step one, adding 65 parts of titanium dioxide, 25 parts of barium oxide, 3 parts of lithium manganate and 10 parts of sodium dodecyl benzene sulfonate into 150 parts of acetone by weight, stirring and ultrasonically dispersing for 2 hours to form a mixture A for later use;
adding 80 parts by weight of bisphenol A epoxy resin, 3 parts by weight of 1, 2-diaminocyclohexane and 1 part by weight of 1- (3-aminopropyl) imidazole into 100 parts by weight of liquid polyethylene glycol, and uniformly stirring and dispersing at 40 ℃ to form a mixture B for later use;
step three, adding 80 parts by weight of the mixture A in the step one into 70 parts by weight of the mixture B in the step two, stirring and ultrasonically dispersing for 2 hours at 40 ℃, and then raising the temperature to 75 ℃ and keeping for 60 minutes;
step four, based on the total weight of the mixture A and the mixture B added in the step three as 100 parts, adding 7 parts of the mixture A in the step one into the mixture which is finally kept for 60 minutes in the step three slowly, raising the temperature to 90 ℃, and keeping the temperature for 2 hours;
and step five, cooling and filtering the product obtained in the step four, sequentially washing the product with absolute ethyl alcohol and deionized water, and drying the product to obtain the porous photocatalyst.
100mg of the prepared porous photocatalyst is added into 100mL of methylene blue wastewater with the concentration of 50mg/L, the mixture is irradiated for 1 hour under a 350w mercury lamp light source, and the degradation rate of residual methylene blue is 85.6 percent by using ultraviolet-visible absorption spectrum detection.
Comparative example 5
A porous photocatalyst for wastewater treatment is prepared by the following steps:
step one, adding 65 parts of titanium dioxide, 25 parts of barium oxide, 3 parts of lithium manganate and 10 parts of sodium dodecyl benzene sulfonate into 150 parts of acetone by weight, stirring and ultrasonically dispersing for 2 hours to form a mixture A for later use;
adding 80 parts by weight of bisphenol A epoxy resin, 3 parts by weight of 1, 2-diaminocyclohexane and 1 part by weight of 1- (3-aminopropyl) imidazole into 100 parts by weight of liquid polyethylene glycol, and uniformly stirring and dispersing at 40 ℃ to form a mixture B for later use;
step three, adding 3 parts by weight of the mixture A in the step one into 70 parts by weight of the mixture B in the step two, stirring and ultrasonically dispersing for 2 hours at 40 ℃, and then raising the temperature to 75 ℃ and keeping for 60 minutes;
step four, based on the total weight of the mixture A and the mixture B added in the step three as 100 parts, adding 7 parts of the mixture A in the step one into the mixture which is finally kept for 60 minutes in the step three slowly, raising the temperature to 90 ℃, and keeping the temperature for 2 hours;
and step five, cooling and filtering the product obtained in the step four, sequentially washing the product with absolute ethyl alcohol and deionized water, and drying the product to obtain the porous photocatalyst.
100mg of the prepared porous photocatalyst is added into 100mL of methylene blue wastewater with the concentration of 50mg/L, the mixture is irradiated for 1 hour under a 350w mercury lamp light source, and the degradation rate of residual methylene blue is 73.0 percent by using ultraviolet-visible absorption spectrum detection.
Comparative example 6
A porous photocatalyst for wastewater treatment is prepared by the following steps:
step one, adding 65 parts of titanium dioxide, 25 parts of barium oxide, 3 parts of lithium manganate and 10 parts of sodium dodecyl benzene sulfonate into 150 parts of acetone by weight, stirring and ultrasonically dispersing for 2 hours to form a mixture A for later use;
adding 80 parts by weight of bisphenol A epoxy resin, 3 parts by weight of 1, 2-diaminocyclohexane and 1 part by weight of 1- (3-aminopropyl) imidazole into 100 parts by weight of liquid polyethylene glycol, and uniformly stirring and dispersing at 40 ℃ to form a mixture B for later use;
step three, adding 30 parts by weight of the mixture A in the step one into 70 parts by weight of the mixture B in the step two, stirring and ultrasonically dispersing for 2 hours at 40 ℃, and then raising the temperature to 75 ℃ and keeping for 60 minutes;
step four, based on the total weight of the mixture A and the mixture B added in the step three as 100 parts, slowly adding 50 parts of the mixture A in the step one again into the mixture which is finally kept for 60 minutes in the step three, heating to 90 ℃, and keeping for 2 hours;
and step five, cooling and filtering the product obtained in the step four, sequentially washing the product with absolute ethyl alcohol and deionized water, and drying the product to obtain the porous photocatalyst.
100mg of the prepared porous photocatalyst is added into 100mL of methylene blue wastewater with the concentration of 50mg/L, the mixture is irradiated for 1 hour under a 350w mercury lamp light source, and the degradation rate of residual methylene blue is 83.6 percent by using ultraviolet-visible absorption spectrum detection.
Comparative example 7
A porous photocatalyst for wastewater treatment is prepared by the following steps:
step one, adding 65 parts of titanium dioxide, 25 parts of barium oxide, 3 parts of lithium manganate and 10 parts of sodium dodecyl benzene sulfonate into 150 parts of acetone by weight, stirring and ultrasonically dispersing for 2 hours to form a mixture A for later use;
adding 80 parts by weight of bisphenol A epoxy resin, 3 parts by weight of 1, 2-diaminocyclohexane and 1 part by weight of 1- (3-aminopropyl) imidazole into 100 parts by weight of liquid polyethylene glycol, and uniformly stirring and dispersing at 40 ℃ to form a mixture B for later use;
step three, adding 30 parts by weight of the mixture A in the step one into 70 parts by weight of the mixture B in the step two, stirring and ultrasonically dispersing for 2 hours at 40 ℃, and then raising the temperature to 75 ℃ and keeping for 60 minutes;
step four, based on the total weight of the mixture A and the mixture B added in the step three as 100 parts, slowly adding 1 part of the mixture A in the step one into the mixture which is finally kept for 60 minutes in the step three again, heating to 90 ℃, and keeping for 2 hours;
and step five, cooling and filtering the product obtained in the step four, sequentially washing the product with absolute ethyl alcohol and deionized water, and drying the product to obtain the porous photocatalyst.
100mg of the prepared porous photocatalyst is added into 100mL of methylene blue wastewater with the concentration of 50mg/L, the mixture is irradiated for 1 hour under a 350w mercury lamp light source, and the degradation rate of residual methylene blue is 86.4 percent by using ultraviolet-visible absorption spectrum detection.
As can be seen from the above examples and comparative examples, the porous photocatalyst with excellent photocatalytic effect is prepared by the two-step method, and the photocatalytic efficiency of the catalyst can be greatly influenced by the use amount of lithium manganate, the addition amount of the mixture A in the first step and the second step, and other factors. In addition, the liquid polyethylene glycol is selected as the pore-forming agent and is washed away after the reaction is finished, holes can be formed in the original space of the liquid polyethylene glycol, so that the contact area between the photocatalysis and the waste water is greatly increased, the average molecular weight of the liquid polyethylene glycol is not too large, otherwise the liquid polyethylene glycol cannot be effectively removed in the cleaning step, the pore-forming effect is not ideal, and the selection of the liquid polyethylene glycol belongs to one of the improvement points of the invention.
The above description is only for the purpose of illustrating the technical solutions of the present invention and is not for the purpose of limiting the present invention, and it will be apparent to those skilled in the art that various modifications and variations can be made in the technical solutions of the present invention. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (10)
1. A preparation method of a porous photocatalyst for wastewater treatment is characterized by being prepared by a two-step method and specifically comprising the following steps:
step one, adding 60-80 parts of titanium dioxide, 25-40 parts of barium oxide, 1-5 parts of lithium manganate and 5-10 parts of sodium dodecyl benzene sulfonate into 150 parts of acetone by weight, stirring and ultrasonically dispersing for 1-2 hours to form a mixture A for later use;
adding 50-80 parts by weight of bisphenol A type epoxy resin, 2-3 parts by weight of 1, 2-diaminocyclohexane and 0.5-1 part by weight of 1- (3-aminopropyl) imidazole into 100 parts by weight of liquid polyethylene glycol, and uniformly stirring and dispersing at 30-40 ℃ to form a mixture B for later use;
step three, adding 30-40 parts by weight of the mixture A in the step one into 60-100 parts by weight of the mixture B in the step two, stirring and ultrasonically dispersing for 1-2 hours at 30-40 ℃, then raising the temperature to 70-75 ℃, and keeping the temperature for 30-60 minutes;
step four, based on 100 parts of the total weight of the mixture A and the mixture B added in the step three, slowly adding 5-10 parts of the mixture A in the step one into the mixture which is finally kept for 30-60 minutes in the step three again, raising the temperature to 80-90 ℃, and keeping the temperature for 1-2 hours;
and step five, cooling and filtering the product obtained in the step four, sequentially washing the product with absolute ethyl alcohol and deionized water, and drying the product to obtain the porous photocatalyst.
2. The method according to claim 1, wherein in the first step, the titanium dioxide is 65 parts, the barium oxide is preferably 25 parts, the lithium manganate is preferably 3 parts, and the sodium dodecylbenzenesulfonate is preferably 10 parts.
3. The method according to claim 1, wherein the softening point of the bisphenol a epoxy resin in the second step is 30 ℃ or lower.
4. The method of claim 1, wherein the liquid polyethylene glycol has an average molecular weight < 600.
5. The method according to claim 1, wherein the bisphenol A epoxy resin is preferably 80 parts, the 1, 2-diaminocyclohexane is preferably 3 parts, and the 1- (3-aminopropyl) imidazole is 1 part.
6. The method according to claim 1, wherein the titanium dioxide in the first step is nano-sized titanium dioxide.
7. The method according to claim 1, wherein the mixture A in the third step is preferably 30 parts, and the mixture B in the third step is preferably 70 parts.
8. The process according to claim 1, wherein the mixture A added again in step four is preferably 7 parts.
9. The method of claim 1, wherein the porous photocatalyst obtained in the fifth step is nano-sized particles.
10. A porous photocatalyst for wastewater treatment, which is produced by the production method according to any one of claims 1 to 9.
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