CN109248711B - Loaded TiO (titanium dioxide)2Preparation method of PPS photocatalytic film - Google Patents

Loaded TiO (titanium dioxide)2Preparation method of PPS photocatalytic film Download PDF

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CN109248711B
CN109248711B CN201811197401.5A CN201811197401A CN109248711B CN 109248711 B CN109248711 B CN 109248711B CN 201811197401 A CN201811197401 A CN 201811197401A CN 109248711 B CN109248711 B CN 109248711B
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韩娜
杨焯
王卫静
张文昕
夏博伦
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Tianjin Polytechnic University
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Abstract

The invention discloses a loaded TiO2The preparation method of the PPS photocatalytic film comprises the following steps: of a titanium source, sulphate with ethanol, water and hydrochloric acidMixing the composite solution, and stirring at normal temperature to be homogeneous to obtain TiO2Precursor solution; wetting a PPS microporous membrane in ethanol, and then transferring the PPS microporous membrane into a nitric acid solution with the concentration for treatment; immersing PPS microporous membrane into TiO2Transferring the precursor solution into a hydrothermal reaction kettle together for hydrothermal reaction, washing and drying to obtain PPS @ TiO2A photocatalytic film. The method adopts a high-temperature hydrothermal method to prepare TiO2Growing on the surface of the PPS microporous membrane in situ to promote TiO2The crystallinity of the nano particles can obtain the nano TiO loaded on the surface and the inner side of the pore channel with uniform pore diameter, high porosity, large specific surface area, high loading capacity, high catalyst crystallinity, firm combination and controllable appearance under the condition of avoiding using an adhesive2The PPS photocatalytic film effectively improves the specific surface area and catalytic activity of the catalyst.

Description

Loaded TiO (titanium dioxide)2Preparation method of PPS photocatalytic film
Technical Field
The invention belongs to the field of photocatalytic film preparation, and particularly relates to a supported TiO2The method for preparing the PPS photocatalytic film.
Background
Organic pollutants are one of the more difficult-to-treat environmental pollutants because of their stable structure and low biodegradability. The semiconductor photocatalysis technology can directly utilize light energy to completely mineralize and remove various organic pollutants, and is one of ideal organic pollutant treatment technologies. In semiconductor materials, nano TiO2Has attracted wide attention with the characteristics of high efficiency, environmental protection, no toxicity and stability. However, nano TiO2The photocatalytic material has the defects of difficult recovery, easy agglomeration and the like, and is easy to cause secondary pollution and reduce the catalytic efficiency. Therefore, the supported photocatalytic material is increasingly used.
In the research of the supported photocatalytic material, the selection of the matrix is the key of the research, and at present, the matrix mainly comprises a microsphere material, a two-dimensional material, a fiber fabric, an inorganic material and a membrane material. Among them, polymer membrane materials are receiving wide attention in terms of high porosity, high specific surface area, and strong adsorption capacity. At present, the loading modes of the supported photocatalytic material mainly include a blending method, a deposition method, a sol-gel method, an adhesive bonding method and a low-temperature hydrothermal method. The blending method needs to embed the catalyst in a polymer matrix, and limits the loading capacity and catalytic efficiency of the catalyst. The materials prepared by the deposition method and the sol-gel method have the problem of poor binding force between the catalyst and the matrix. The use of the binder not only increases the production cost, but also causes environmental pollution. The catalyst in the photocatalytic film material prepared by the low-temperature hydrothermal method exists in an amorphous form, the crystallinity is low, and the photocatalytic performance of the material is greatly reduced.
The document of application No. 201611156787.6 discloses an activated carbon fiber loaded nano TiO2A method for preparing a film. The method adopts an in-situ induced reverse micelle method to prepare the dense nano TiO with uniform loading, no crack, strong adhesive force and controllable film thickness of the activated carbon fiber2A composite photocatalytic material of film. The method effectively solves the problem of nano TiO2The photocatalytic material is difficult to recycle and easy to agglomerate, but the further application and development of the method are limited by the complex process flow, the harsh preparation conditions and the long preparation path. The document of application No. 2017111579844 discloses a surface-supported TiO2The preparation method of polyetherimide photocatalytic ultrafiltration membrane of nano wire is characterized by that it utilizes low-temp. crystallization technique to grow TiO on the surface of membrane2The nano-wire improves the hydrophilicity of the membrane, thereby improving the flux of the membrane while keeping high rejection rate, and applying the membrane to the fields of photocatalytic pollution treatment and the like. However, the catalyst has relatively limited active site exposure and the matrix has less contribution to the improvement of catalytic efficiency and has a single function.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to solve the technical problem of providing a supported TiO2The method for preparing the PPS photocatalytic film.
The technical scheme for solving the technical problem is to provide a loaded TiO2The preparation method of the PPS photocatalytic film is characterized by comprising the following steps:
1)TiO2precursor solutionPreparing a liquid: mixing a titanium source, sulfate, ethanol, water and hydrochloric acid composite solution, and stirring at normal temperature to be homogeneous to obtain TiO2Precursor solution; TiO 22The concentration of the titanium source in the precursor solution is 1-500 g/L, and the concentration of the sulfate is 1-50 g/L; the volume ratio of the ethanol to the water to the hydrochloric acid is 2-6:1-3: 1-3;
2) pretreating a PPS microporous membrane: wetting a PPS microporous membrane in ethanol, transferring the PPS microporous membrane into a nitric acid solution with the concentration of 5-55 wt.%, and stirring for 0.5-8 hours at the temperature of 10-50 ℃;
3) high-temperature hydrothermal method for in-situ generation of PPS @ TiO2Photocatalytic film: immersing the PPS microporous membrane obtained in the step 2) into the TiO obtained in the step 1)2And transferring the precursor solution into a hydrothermal reaction kettle together for hydrothermal reaction for 2-30 h at the reaction temperature of 80-240 ℃, and washing and drying to obtain PPS @ TiO2A photocatalytic film;
adding 0.01-1 ml of TiO into each square centimeter of PPS microporous membrane2And (3) precursor solution.
Compared with the prior art, the invention has the beneficial effects that:
(1) adopts nontoxic, green, stable and antibacterial TiO2As the main catalyst, TiO is subjected to a high-temperature hydrothermal method2Growing on the surface of the PPS microporous membrane in situ to promote TiO2The crystallinity of the nano particles can obtain the nano TiO loaded on the surface and the inner side of the pore channel with uniform pore diameter, high porosity, large specific surface area, high loading capacity, high catalyst crystallinity, firm combination and controllable appearance under the condition of avoiding using an adhesive2The PPS photocatalytic film effectively improves the specific surface area and catalytic activity of the catalyst.
(2) The catalyst carrier is high-temperature-resistant, solvent-resistant and acid-alkali-corrosion-resistant high-performance material PPS, and the main chain of the PPS contains a large number of benzene rings, so that pi-type complex adsorption can be formed, the chemical adsorption of organic pollutants is improved from the perspective of a substrate, and the catalysis efficiency of the catalyst is further improved.
(3) The PPS microporous membrane has a dendritic structure, has higher specific surface area and porosity, and further improves the adsorbability of the catalytic membrane material. The improvement of the chemical adsorption is beneficial to improving the catalytic efficiency of heterogeneous catalysis, thereby obtaining the photocatalytic film with high catalytic efficiency.
(4) The introduction of the process of nitric acid pretreatment to the PPS microporous membrane can partially oxidize thioether bonds on the main chain into sulfoxide bonds to provide chemical bond binding sites on the premise of not damaging the mechanical properties of the original PPS membrane, and the sulfoxide bonds have electronegativity and can be mutually attracted with positively charged titanium source hydrolysis intermediate products to form electrostatic force binding to form firm interaction, so that the binding force of inorganic nano catalyst particles and a membrane matrix is improved, and the use of an adhesive is avoided.
(5) The preparation process is simple, the preparation flow is short, the reaction condition is mild and controllable, and the operation is convenient.
Drawings
FIG. 1 shows the TiO-supported catalyst of the present invention2SEM photograph of the photocatalytic film prepared in example 2 of the preparation method of the PPS photocatalytic film;
FIG. 2 shows the TiO loading of the present invention2The XRD pattern of the photocatalytic film prepared in the method for preparing a PPS photocatalytic film in example 2;
FIG. 3 shows the TiO loading of the present invention2The photocatalytic degradation curve diagram of the photocatalytic film prepared in the embodiment 2 of the preparation method of the PPS photocatalytic film on the methylene blue organic solvent;
FIG. 4 shows TiO loading according to the present invention2SEM photograph of the photocatalytic film prepared in comparative example 1;
Detailed Description
Specific examples of the present invention are given below. The specific examples are only intended to illustrate the invention in further detail and do not limit the scope of protection of the claims of the present application.
The invention provides a loaded TiO2The preparation method (method for short) of the PPS photocatalytic film is characterized by comprising the following steps:
1)TiO2preparing a precursor solution: mixing a titanium source, sulfate, ethanol, water and hydrochloric acid composite solution, and stirring at normal temperature to be homogeneous to obtain TiO2Precursor solution; TiO 22The concentration of the titanium source in the precursor solution is 1-500 g/L, and the concentration of the sulfate is 1-50 g/L; the volume ratio of the ethanol to the water to the hydrochloric acid is 2-6:1-3: 1-3;
preferably, the concentration of the titanium source is 10-200 g/L, the concentration of sulfate is 2-10 g/L, and the volume ratio of ethanol to water to hydrochloric acid is 3-5:1-3: 1-3;
the titanium source is at least one of tetrabutyl titanate, titanium tetrachloride, titanium sulfate, titanium trichloride, isopropyl titanate, titanocene dichloride, titanium tetrafluoride or titanium potassium oxalate;
the sulfate is at least one of ferric sulfate, ammonium sulfate, titanium sulfate, sodium sulfate, magnesium sulfate, copper sulfate, potassium sulfate or aluminum sulfate;
2) pretreating a PPS microporous membrane: wetting a PPS microporous membrane in ethanol, transferring the PPS microporous membrane into a nitric acid solution with the concentration of 5-55 wt.%, and stirring for 0.5-8 hours at the temperature of 10-50 ℃;
3) high-temperature hydrothermal method for in-situ generation of PPS @ TiO2Photocatalytic film: immersing the PPS microporous membrane obtained in the step 2) into the TiO obtained in the step 1)2And transferring the precursor solution into a hydrothermal reaction kettle together for hydrothermal reaction for 2-30 h at the reaction temperature of 80-240 ℃, washing the membrane obtained by the reaction with deionized water, and drying in an oven for 6-24 h to obtain PPS @ TiO2A photocatalytic film.
Adding 0.01-1 ml of TiO into each square centimeter of PPS microporous membrane2Precursor solution; preferably, 0.02-0.04 ml of TiO is added into each square centimeter of PPS microporous membrane2And (3) precursor solution.
PPS@TiO2The photocatalytic film can be applied to organic dye wastewater.
Example 1
1) Mixing titanium tetrachloride, ammonium sulfate, ethanol, water and hydrochloric acid at a volume ratio of 2:1:1 at room temperature, and stirring to obtain TiO2Precursor solution; TiO 22The concentration of a titanium source in the precursor solution is 50g/L, and the concentration of sulfate is 1 g/L;
2) the PPS microporous membrane was wetted in ethanol and then transferred to a 20% nitric acid solution and stirred at 20 ℃ for 4 hours.
3) Is measured by a distance of 20cm2Immersing the obtained pretreated PPS microporous membrane into 20ml of precursor solution, transferring the solution to a hydrothermal reaction kettle for hydrothermal reaction for 24 hours at the reaction temperature of 220 ℃, washing the membrane obtained by the reaction with deionized water, and drying the membrane in an oven for 24 hours to obtain PPS @ TiO @2A photocatalytic film.
Tested, PPS @ TiO2The photocatalytic film had a porosity of 78.1% and a titania loading of 19.2%. The method for measuring the photocatalytic performance by adopting methylene blue to simulate liquid organic pollutants comprises the following specific steps: PPS @ TiO 2.5cm in diameter2Placing the photocatalytic film in 25mL of methylene blue aqueous solution (20mg/L), adsorbing for 1h under magnetic stirring in 200rmp black, then opening an ultraviolet lamp for photocatalytic degradation, and testing to obtain the PPS @ TiO2The catalytic efficiency of the photocatalytic film on methylene blue is more than 93%. Through the test of a water flow scouring test (water flow scouring for 150min under the pressure of 2 bar), the flux of the photocatalytic film is attenuated by 11 percent, and the supported TiO is2Is firm and not easy to fall off.
Example 2
1) Mixing tetrabutyl titanate, ammonium sulfate, ethanol, water and hydrochloric acid at a volume ratio of 4:1:2 at room temperature, and stirring to obtain TiO2Precursor solution; TiO 22The concentration of a titanium source in the precursor solution is 150g/L, and the concentration of sulfate is 5 g/L;
2) the PPS microporous membrane was wetted in ethanol, and then transferred to a 10% nitric acid solution and stirred at 50 ℃ for 1 hour.
3) Is measured by a distance of 20cm2Immersing the obtained pretreated PPS microporous membrane into 10ml of precursor solution, transferring the precursor solution into a hydrothermal reaction kettle for hydrothermal reaction for 12 hours at the reaction temperature of 180 ℃, washing the membrane obtained by the reaction with deionized water, and drying the membrane in an oven for 24 hours to obtain PPS @ TiO @2A photocatalytic film.
Tested, PPS @ TiO2The photocatalytic film had a porosity of 73.4% and a titania loading of 50.6%. Adopting methylene blue to simulate liquid organic pollutants to measure photocatalytic performance, and testing to prepare PPS @ TiO2The catalytic efficiency of the photocatalytic film to methylene blue is more than 99%. Through the test of a water flow scouring test, the flux of the photocatalytic film is attenuated by 17 percent, and the loaded TiO2Is firm and not easy to fall off.
Example 3
1) Mixing titanium sulfate, ammonium sulfate, ethanol, water and hydrochloric acid at a volume ratio of 6:2:3 at room temperature, and stirring to obtain TiO2Precursor solution; TiO 22The concentration of the titanium source in the precursor solution is 400g/L, and the concentration of the sulfate is 50 g/L;
2) the PPS microporous membrane was wetted in ethanol and then transferred to a 30% nitric acid solution and stirred at 20 ℃ for 1 hour.
3) Is measured by a distance of 20cm2Immersing the obtained pretreated PPS microporous membrane into 10ml of precursor solution, transferring the precursor solution into a hydrothermal reaction kettle for hydrothermal reaction for 30 hours at the reaction temperature of 120 ℃, washing the membrane obtained by the reaction with deionized water, and drying the membrane in an oven for 24 hours to obtain PPS @ TiO @2A photocatalytic film.
Tested, PPS @ TiO2The photocatalytic film had a porosity of 76.8% and a titania loading of 38.7%. Adopting methylene blue to simulate liquid organic pollutants to measure photocatalytic performance, and testing to prepare PPS @ TiO2The catalytic efficiency of the photocatalytic film to methylene blue is more than 98%. Through the test of a water flow scouring test, the flux of the photocatalytic film is attenuated by 13 percent, and the loaded TiO2Is firm and not easy to fall off.
Example 4
1) Mixing potassium titanium oxalate, ammonium sulfate, ethanol, water and hydrochloric acid at a volume ratio of 4:2:1 at room temperature, and stirring to obtain TiO2Precursor solution; TiO 22The concentration of a titanium source in the precursor solution is 300g/L, and the concentration of sulfate is 20 g/L;
2) the PPS microporous membrane was wetted in ethanol and then transferred to a 30% nitric acid solution and stirred at 20 ℃ for 1 hour.
3) Is measured by a distance of 20cm2The obtained pretreated PPS microporous membrane is immersed in 20ml of precursor solution and transferred to a hydrothermal reaction kettle for hydrothermal reaction 1Washing the film obtained by the reaction with deionized water at the reaction temperature of 150 ℃ for 2h, and drying in an oven for 12h to obtain PPS @ TiO2A photocatalytic film.
Tested, PPS @ TiO2The photocatalytic film had a porosity of 74.6% and a titania loading of 41.4%. Adopting methylene blue to simulate liquid organic pollutants to measure photocatalytic performance, and testing to prepare PPS @ TiO2The catalytic efficiency of the photocatalytic film to methylene blue is more than 98%. Through the test of a water flow scouring test, the flux of the photocatalytic film is attenuated by 14 percent, and the supported TiO2Is firm and not easy to fall off.
Example 5
1) Mixing isopropyl titanate, ammonium sulfate, ethanol, water and hydrochloric acid at a volume ratio of 4:1:2 at normal temperature, and stirring to be homogeneous to obtain TiO2Precursor solution; TiO 22The concentration of a titanium source in the precursor solution is 250g/L, and the concentration of sulfate is 10 g/L;
2) the PPS microporous membrane was wetted in ethanol and then transferred to a 5% nitric acid solution and stirred at 20 ℃ for 5 hours.
3) Is measured by a distance of 20cm2Immersing the obtained pretreated PPS microporous membrane into 10ml of precursor solution, transferring the precursor solution into a hydrothermal reaction kettle for hydrothermal reaction for 10 hours at the reaction temperature of 200 ℃, washing the membrane obtained by the reaction with deionized water, and drying the membrane in an oven for 12 hours to obtain PPS @ TiO @2A photocatalytic film.
Tested, PPS @ TiO2The photocatalytic film had a porosity of 73.0% and a titania loading of 49.3%. Adopting methylene blue to simulate liquid organic pollutants to measure photocatalytic performance, and testing to prepare PPS @ TiO2The catalytic efficiency of the photocatalytic film to methylene blue is more than 99%. Through the test of a water flow scouring test, the flux of the photocatalytic film is attenuated by 16 percent, and the loaded TiO2Is firm and not easy to fall off.
Example 6
1) Mixing titanium trichloride, ammonium sulfate, ethanol, water and hydrochloric acid at a volume ratio of 6:1:2 at room temperature, and stirring to obtain TiO2Precursor solution; TiO 22The concentration of a titanium source in the precursor solution is 100g/L, and the concentration of sulfate is 20 g/L;
2) the PPS microporous membrane was wetted in ethanol and then transferred to a 20% nitric acid solution and stirred at 30 ℃ for 2 hours.
3) Is measured by a distance of 20cm2Immersing the obtained pretreated PPS microporous membrane into 10ml of precursor solution, transferring the precursor solution into a hydrothermal reaction kettle for hydrothermal reaction for 24 hours at the reaction temperature of 200 ℃, washing the membrane obtained by the reaction with deionized water, and drying the membrane in an oven for 12 hours to obtain PPS @ TiO @2A photocatalytic film.
Tested, PPS @ TiO2The photocatalytic film had a porosity of 74.2% and a titanium dioxide loading of 45.6%. Adopting methylene blue to simulate liquid organic pollutants to measure photocatalytic performance, and testing to prepare PPS @ TiO2The catalytic efficiency of the photocatalytic film to methylene blue is more than 99%. Through the test of a water flow scouring test, the flux of the photocatalytic film is attenuated by 15 percent, and the loaded TiO2Is firm and not easy to fall off.
Example 7
1) Mixing titanium tetrachloride, ammonium sulfate, ethanol, water and hydrochloric acid at a volume ratio of 5:2:2 at room temperature, and stirring to obtain TiO2Precursor solution; TiO 22The concentration of a titanium source in the precursor solution is 100g/L, and the concentration of sulfate is 10 g/L;
2) the PPS microporous membrane was wetted in ethanol and then transferred to a 20% nitric acid solution and stirred at 40 ℃ for 1 hour.
3) Is measured by a distance of 20cm2Immersing the obtained pretreated PPS microporous membrane into 10ml of precursor solution, transferring the precursor solution into a hydrothermal reaction kettle for hydrothermal reaction for 12 hours at the reaction temperature of 180 ℃, washing the membrane obtained by the reaction with deionized water, and drying the membrane in an oven for 12 hours to obtain PPS @ TiO @2A photocatalytic film.
Tested, PPS @ TiO2The photocatalytic film had a porosity of 76.2% and a titania loading of 33.3%. Adopting methylene blue to simulate liquid organic pollutants to measure photocatalytic performance, and testing to prepare PPS @ TiO2Photocatalytic film para-methyleneThe catalytic efficiency of blue is above 98%. Through the test of a water flow scouring test, the flux of the photocatalytic film is attenuated by 15 percent, and the loaded TiO2Is firm and not easy to fall off.
Example 8
1) Mixing tetrabutyl titanate, ammonium sulfate, ethanol, water and hydrochloric acid at a volume ratio of 6:1:2 at room temperature, and stirring to obtain TiO2Precursor solution; TiO 22The concentration of a titanium source in the precursor solution is 200g/L, and the concentration of sulfate is 10 g/L;
2) the PPS microporous membrane was wetted in ethanol and then transferred to a 25% nitric acid solution and stirred at 25 ℃ for 1 hour.
3) Is measured by a distance of 20cm2Immersing the obtained pretreated PPS microporous membrane into 20ml of precursor solution, transferring the solution to a hydrothermal reaction kettle for hydrothermal reaction for 12 hours at the reaction temperature of 200 ℃, washing the membrane obtained by the reaction with deionized water, and drying the membrane in an oven for 12 hours to obtain PPS @ TiO @2A photocatalytic film.
Tested, PPS @ TiO2The photocatalytic film had a porosity of 72.7% and a titania loading of 50.1%. Adopting methylene blue to simulate liquid organic pollutants to measure photocatalytic performance, and testing to prepare PPS @ TiO2The catalytic efficiency of the photocatalytic film to methylene blue is more than 99%. Through the test of a water flow scouring test, the flux of the photocatalytic film is attenuated by 17 percent, and the loaded TiO2Is firm and not easy to fall off.
Example 9
1) Mixing tetrabutyl titanate, ammonium sulfate, ethanol, water and hydrochloric acid at a volume ratio of 4:1:2 at room temperature, and stirring to obtain TiO2Precursor solution; TiO 22The concentration of a titanium source in the precursor solution is 300g/L, and the concentration of sulfate is 15 g/L;
2) the PPS microporous membrane was wetted in ethanol and then transferred to a 40% nitric acid solution and stirred at 20 ℃ for 1 hour.
3) Is measured by a distance of 20cm2Immersing the obtained pretreated PPS microporous membrane into 15ml of precursor solution, transferring the precursor solution into a hydrothermal reaction kettle for hydrothermal reaction for 24 hours at the reaction temperature ofWashing the film obtained by the reaction with deionized water at 200 ℃, and drying in an oven for 12 hours to obtain PPS @ TiO2A photocatalytic film.
Tested, PPS @ TiO2The photocatalytic film had a porosity of 72.1% and a titania loading of 53.5%. Adopting methylene blue to simulate liquid organic pollutants to measure photocatalytic performance, and testing to prepare PPS @ TiO2The catalytic efficiency of the photocatalytic film to methylene blue is more than 99%. Through the test of a water flow scouring test, the flux of the photocatalytic film is attenuated by 18 percent, and the loaded TiO2Is firm and not easy to fall off.
Comparative example 1
1) Mixing tetrabutyl titanate, ammonium sulfate, ethanol, water and hydrochloric acid at a volume ratio of 4:1:2 at room temperature, and stirring to obtain TiO2Precursor solution; TiO 22The concentration of a titanium source in the precursor solution is 150g/L, and the concentration of sulfate is 5 g/L;
2) is measured by a distance of 20cm2Immersing the non-pretreated PPS microporous membrane into 10ml of precursor solution, transferring the solution to a hydrothermal reaction kettle for hydrothermal reaction for 12 hours at the reaction temperature of 180 ℃, washing the membrane obtained by the reaction with deionized water, and drying the membrane in an oven for 24 hours to obtain PPS @ TiO @2A photocatalytic film.
Tested, PPS @ TiO2The photocatalytic film had a porosity of 74.6% and a titania loading of 47.8%. Adopting methylene blue to simulate liquid organic pollutants to measure photocatalytic performance, and testing to prepare PPS @ TiO2The catalytic efficiency of the photocatalytic film on methylene blue is over 88 percent. Through the test of a water flow scouring test, the flux of the photocatalytic film is attenuated by 72 percent, and the loaded TiO2The large amount of falling leads to hole blockage, and has no application value.
Comparative example 2
1) Mixing tetrabutyl titanate, ammonium sulfate, ethanol, water and hydrochloric acid at a volume ratio of 4:1:2 at room temperature, and stirring to obtain TiO2Precursor solution; TiO 22The concentration of a titanium source in the precursor solution is 150g/L, and the concentration of sulfate is 5 g/L;
2) 10ml of precursor solution was transferred toCarrying out hydrothermal reaction for 12h in a hydrothermal reaction kettle at the temperature of 180 ℃, and reacting to obtain TiO2The powder is washed clean by deionized water and dried in an oven for 24 hours to obtain TiO2And (3) nanoparticles. Will produce TiO2The nano particles are added into the casting solution according to the proportion of 5 percent by mass to prepare PPS @ TiO @2And (3) blending the composite photocatalytic film.
Tested, PPS @ TiO2The porosity of the blended composite photocatalytic film is 79.1%, and the loading rate of titanium dioxide is 5%. Adopting methylene blue to simulate liquid organic pollutants to measure photocatalytic performance, and testing to prepare PPS @ TiO2The catalytic efficiency of the blended composite photocatalytic film to methylene blue is over 71 percent. Through the test of a water flow scouring test, the flux of the blended composite photocatalytic membrane is attenuated by 8 percent, and the loaded TiO is2But the catalyst is more embedded in the membrane, so that the catalytic sites are few and the catalytic efficiency is poor.
Nothing in this specification is said to apply to the prior art.

Claims (5)

1. Loaded TiO (titanium dioxide)2The preparation method of the PPS photocatalytic film is characterized by comprising the following steps:
1）TiO2preparing a precursor solution: mixing a titanium source, ammonium sulfate, ethanol, water and hydrochloric acid composite solution, and stirring at normal temperature to be homogeneous to obtain TiO2Precursor solution; TiO 22The concentration of the titanium source in the precursor solution is 1-500 g/L, and the concentration of ammonium sulfate is 1-50 g/L; the volume ratio of the ethanol to the water to the hydrochloric acid is 2-6:1-3: 1-3;
2) pretreating a PPS microporous membrane: wetting a PPS microporous membrane in ethanol, transferring the PPS microporous membrane into a nitric acid solution with the concentration of 5-55 wt.%, and stirring for 0.5-8 hours at the temperature of 10-50 ℃;
3) high-temperature hydrothermal method for in-situ generation of PPS @ TiO2Photocatalytic film: immersing the PPS microporous membrane obtained in the step 2) into the TiO obtained in the step 1)2And transferring the precursor solution into a hydrothermal reaction kettle together for hydrothermal reaction for 2-30 h at the reaction temperature of 80-240 ℃, and washing and drying to obtain PPS @ TiO2A photocatalytic film;
adding 0.01-1 ml of TiO into each square centimeter of PPS microporous membrane2And (3) precursor solution.
2. The TiO-supported according to claim 12The preparation method of the PPS photocatalytic film is characterized in that the concentration of a titanium source is 10-200 g/L, the concentration of ammonium sulfate is 2-10 g/L, and the volume ratio of ethanol to water to hydrochloric acid is 3-5:1-3: 1-3.
3. The TiO-supported according to claim 12The preparation method of the PPS photocatalytic film is characterized in that the titanium source is at least one of tetrabutyl titanate, titanium tetrachloride, titanium sulfate, titanium trichloride, isopropyl titanate, titanocene dichloride, titanium tetrafluoride or titanium potassium oxalate.
4. The TiO-supported according to claim 12The preparation method of the PPS photocatalytic film is characterized in that 0.02-0.04 ml of TiO is added into each square centimeter of PPS microporous film2And (3) precursor solution.
5. PPS @ TiO obtainable by the process according to any one of claims 1 to 42The application of the photocatalytic film in organic dye wastewater.
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