CN114713210A - Composite photocatalytic material, preparation method and application - Google Patents

Composite photocatalytic material, preparation method and application Download PDF

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CN114713210A
CN114713210A CN202210185963.8A CN202210185963A CN114713210A CN 114713210 A CN114713210 A CN 114713210A CN 202210185963 A CN202210185963 A CN 202210185963A CN 114713210 A CN114713210 A CN 114713210A
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strontium
zinc
gel
mixture
titanium dioxide
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彭啸
赵羿伟
陆晓慧
琚成功
吴燕
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Tianjin University of Science and Technology
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Tianjin University of Science and Technology
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Abstract

The invention belongs to the field of sewage treatment, and discloses a composite photocatalytic material, a preparation method and application thereof. According to the invention, zinc salt and strontium salt are used as doped metal atom sources, formaldehyde, resorcinol and phloroglucinol are used as carbon sources, oxalic acid is used as a catalyst, titanium dioxide nanoparticles are mixed in the carbon sources to prepare mixed gel, and the mixed gel is soaked in acetone, dried at normal temperature and calcined in an oxygen-free environment to prepare the composite material. The strontium and zinc co-doped titanium dioxide/carbon aerogel composite material has higher specific surface area and photocatalytic activity. On the basis of improving the photocatalytic degradation efficiency, the method has selectivity for organic pollutants, and is favorable for recycling residual water after photocatalytic treatment.

Description

Composite photocatalytic material, preparation method and application
Technical Field
The invention belongs to the field of organic wastewater treatment, and particularly relates to a composite photocatalytic material, a preparation method and application.
Background
Solubilization of organic wastewater is a difficult problem to solve in the field of water treatment. The solubilized organic wastewater contains a surfactant and organic pollutants. Because of the solubilization of the surfactant, the concentration of organic pollutants is often greater than the solubility of the organic pollutants in common water, and the harm to the environmental safety and the human health is greater than that of common organic wastewater. In addition, due to the foaming effect of the surfactant, the communication between the sewage and the oxygen is isolated in the treatment process, and the treatment effect is difficult to achieve the ideal target. In conclusion, the surfactant has high application cost and great treatment difficulty, so the best strategy for treating the solubilized organic sewage is to degrade the solubilized organic matters as much as possible and retain the surfactant for recycling as much as possible.
Common treatment modes for solubilizing organic sewage comprise a physical adsorption method, a biological method and an advanced oxidation method. The adsorbent used by the physical adsorption method is activated carbon or organic bentonite and the like, although the adsorbent can efficiently adsorb pollutants, the treated adsorbent still needs to be further effectively treated; the biological method inhibits the activity of microorganisms due to the biological toxicity of the surfactant, and has high requirements on degradation environment and operation time, so that the biological method is difficult to apply; the advanced oxidation method is one of the most effective methods for treating the pollutants difficult to degrade at present, and the photocatalytic oxidation technology is one of the effective methods for treating the solubilized organic wastewater. Under special illumination conditions, the photocatalyst directly oxidizes and decomposes pollutants by virtue of cavities generated by the photocatalyst or reacts with water to generate strong oxidation free radicals, and the pollutants are oxidized and decomposed by the free radicals. However, due to the presence of the surfactant in the solubilized organic wastewater, the catalyst or the strong oxidation free radicals generated by the catalyst cannot efficiently contact with the organic pollutants, and the catalytic degradation efficiency is poor. In addition, since the surfactant solubilizes the organic pollutants in an encapsulated manner, the surfactant is generally preferentially degraded in a photocatalytic degradation system, which is extremely disadvantageous for a strategy of retaining the surfactant as much as possible to reuse the solubilized sewage. The composite photocatalytic material with both adsorption and degradation functions is one of effective methods for selectively treating solubilized organic sewage, has high porosity and specific surface area, can effectively and selectively adsorb solubilized organic matters, simultaneously prevents the osmotic adsorption of micelles (usually tens of nanometers), and performs efficient photocatalytic degradation on the solubilized organic matters.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a preparation method of a strontium and zinc co-doped titanium dioxide/carbon aerogel composite material and application thereof in treating solubilized organic sewage.
The invention provides a composite photocatalytic material, which takes carbon aerogel as a framework and loads titanium dioxide, zinc titanate and strontium titanate nanocrystals. The material has large specific surface area and rich mesoporous structure.
The second aspect of the invention provides a preparation method of the composite photocatalytic material, which comprises the steps of mixing titanium dioxide nanoparticles in zinc and strontium serving as doped metal atom sources, formaldehyde, resorcinol and phloroglucinol serving as carbon sources and oxalic acid serving as catalysts to prepare mixed gel, soaking in acetone, drying at normal temperature and calcining in an oxygen-free environment to prepare the composite material.
The zinc is provided by a zinc salt, preferably zinc chloride or nitrate or acetate.
The strontium is provided by a strontium salt, preferably strontium chloride or strontium nitrate or strontium acetate.
Furthermore, zinc chloride is the most preferable, and Zn atoms in the zinc chloride have the effects of promoting the volume expansion of carbon aerogel and increasing the specific surface area of the material in the process of preparing the gel, so that the enrichment effect of organic matters in solubilized sewage is improved.
Further, strontium chloride, in which Sr atom is combined with TiO in the composite material, is most preferable2Reaction to produce SrTiO3The composite material has stronger photocatalytic degradation performance and improves the degradation effect of organic matters in solubilized sewage.
Zn improves the specific surface area of the carbon aerogel in the gelling and carbonizing processes of the carbon aerogel, greatly improves the enrichment performance of dissolved organic pollutants, and Sr plays a role in synergistically promoting the improvement of the specific surface area. Sr reacts to generate strontium titanate, so that the photocatalytic degradation performance of the dissolved organic pollutants is greatly improved, and Sr reacts to generate zinc titanate, so that the photocatalytic degradation is synergistically promoted.
Titanium dioxide promotes the generation of voids inside during the carbon aerogel molding process.
Further, the method comprises the following specific steps:
(1) uniformly mixing a formaldehyde aqueous solution, zinc chloride and strontium chloride under the condition of ice-water bath at 0 ℃, and marking as a mixture A;
(2) uniformly mixing resorcinol, phloroglucinol, oxalic acid, titanium dioxide nanoparticles and water at room temperature, and marking as a mixture B;
(3) and (3) stirring and mixing the mixture A in the step (1) and the mixture B in the step (2) at 15-50 ℃ for 0.5-1h to obtain mixed gel. The higher the temperature in this step, the faster the gelling speed. Preferably 30-35 deg.C, and mixing for 0.5 h.
(4) And (4) transferring the mixed gel obtained in the step (3) to an acetone solvent environment for soaking, and keeping the temperature of the mixed gel at 30-60 ℃ for soaking for 36-72 hours. If the temperature in this step is too low or the time is too short, the acetone substitution is insufficient, and the gel is likely to collapse in the subsequent drying process, so that the material cannot be molded. Further preferred temperature is 40-50 deg.C, and preferred soaking time is 40-60 h.
(5) And (4) taking out the mixed gel soaked in the acetone in the step (4), placing the mixed gel in an open normal-temperature normal-pressure environment, and standing and drying the mixed gel to constant weight.
(6) And (4) placing the dried mixed gel obtained in the step (5) into a tubular furnace, calcining in an oxygen-free environment, and calcining at the temperature of 800-.
If calcined in an aerobic environment, it will result in loss of carbon. If the calcination temperature is set below 800 ℃, the calcination of the gel is incomplete, and the interior of the gel has insufficient pore structure; if the calcination temperature is set to more than 1000 ℃, the crystal forms of strontium titanate and zinc titanate are disadvantageously transformed, and the crystals are coarse, which is manifested as a reduction in specific surface area. Therefore, the calcination is preferably carried out at 900 to 950 ℃ for 2 to 2.5 hours.
Further, in the step (1), the mass fraction of formaldehyde in the aqueous formaldehyde solution is 37%.
Further, in the step (1), formaldehyde, zinc chloride and strontium chloride are mixed according to a molar ratio of 1: 0.0005-0.008: 0.001-0.01, preferably in a ratio of 1: 0.0005-0.004: 0.002-0.008, further preferred ratio is 1: 0.0005-0.002: 0.003-0.006. The doping amount of zinc chloride and strontium chloride has obvious influence on the performance of the material, and if the doping amount is too large, the crystal sizes of strontium titanate and zinc titanate are large, the specific surface area is reduced, the strength of the material is reduced, and the powder falling amount is increased.
Further, in the step (2), the room temperature is 15-35 ℃.
Further, in the step (2), the mass ratio of resorcinol, phloroglucinol, oxalic acid, titanium dioxide nanoparticles and water is 1: 0.10-0.50: 0.01-0.20: 0.10-1.00: 10-30, preferably in a ratio of 1: 0.10-0.40: 0.01-0.10: 0.20-0.70: 10-30, further preferred ratio is 1: 0.10-0.30: 0.01-0.05: 0.30-0.50: 10-30.
Resorcinol and phloroglucinol are main carbon sources, and if the consumption is too low, the gel is not formed, and if the consumption is too high, the porosity of the gel is reduced; oxalic acid is used as a catalyst, when the using amount is too small, gel is not formed, and when the using amount is too large, the strength of the material is reduced; when the dosage of the titanium dioxide nano particles is too small, no addition effect is generated, and when the dosage is too large, the strength of the material is reduced, and the powder falling is increased; too little water will result in a decrease in the porosity of the gel, while too much water will result in no formation of the gel.
Further, in the step (4), the acetone solution is replaced for 1 to 10 times, preferably 5 to 8 times during the whole process of the acetone heat preservation and soaking.
Further, in the step (5), the standard of drying to constant weight is that the mass difference is less than 0.1% before and after drying for 24 h.
Further, in the step (6), the oxygen-free environment refers to an inert gas atmosphere such as nitrogen or argon.
Further, in the step (6), in the calcining process under the oxygen-free environment, the heating rate is 1-5 ℃/min. The slower the heating rate, the better, preferably 1 ℃/min, the equipment temperature rise over 5 ℃/min is too fast, and the temperature rush phenomenon exists.
The third aspect of the invention provides the application of the composite photocatalytic material in photocatalytic treatment of solubilized organic sewage. The application conditions are as follows: degrading solubilized organic matters under the illumination of an ultraviolet lamp, wherein the degradable organic matters are persistent organic matters such as PAHs (polycyclic aromatic hydrocarbons), HOCs (HoCs) and the like, and the concentration of solubilized pollutants is 1-100 mg/L; the surfactant in the sewage is anionic or nonionic surfactant, or one or more of one or two types of surfactants, and the concentration of the surfactant is 2-20 times of CMC; the ultraviolet lamp irradiation power is 50-300W.
The composite material is particularly suitable for treating sewage with pollutants of phenanthrene, naphthalene and pentachlorophenol and surfactants of sodium dodecyl benzene sulfonate, triton 100 and tween 80.
The invention has the advantages and beneficial effects that:
1. the strontium and zinc co-doped titanium dioxide/carbon aerogel composite material prepared by the method has a high specific surface area, and the specific surface area of the prepared material can reach 1100m under the normal-temperature and normal-pressure drying condition2More than g.
2. The strontium and zinc co-doped titanium dioxide/carbon aerogel composite material prepared by the invention has higher degradation efficiency on the treatment of solubilized organic sewage, and the degradation rate can reach 90% within 360 min.
3. The strontium and zinc co-doped titanium dioxide/carbon aerogel composite material prepared by the method has 5-20nm micropores, and has high selectivity on solubilized organic sewage containing organic pollutants with the size of about 1nm and surfactant micelles with the size of about 20-50 nm.
4. The preparation method is simple, the raw materials are cheap, and the method is simple and easy to operate.
Detailed Description
The present invention is further illustrated by the following specific examples, which are intended to be illustrative, not limiting and are not intended to limit the scope of the invention.
The degradation rate mentioned in the present invention is calculated by the following formula:
degradation rate ═ C0-Ct)/C0×100％
Wherein, C0At the original concentration, CtThe concentration after degradation.
Example 1
Uniformly mixing 6.9ml of formaldehyde aqueous solution (37 wt%), 0.013g of zinc chloride and 0.073g of strontium chloride (molar ratio of 1: 0.001: 0.005) under the condition of ice-water bath at 0 ℃ to obtain a mixture A;
uniformly mixing 4.4g of resorcinol, 0.76g of phloroglucinol, 0.10g of oxalic acid, 1.12g of titanium dioxide nanoparticles and 15ml of water (molar ratio of 1: 0.15: 0.02: 0.35: 20.83) at 25 ℃ in a room temperature environment, and marking as a mixture B;
the mixture A and the mixture B were stirred and mixed at 40 ℃ for 0.5h to obtain a mixed gel.
Transferring the mixed gel into a container containing an acetone solvent, keeping the mixed gel immersed in a water bath environment at 50 ℃ for 72 hours, and replacing the solvent acetone for 8 times (replacing the solvent acetone once every 8 hours) again;
and taking out the mixed gel soaked by the acetone, placing the mixed gel in an open normal-temperature normal-pressure environment, standing and drying the mixed gel to constant weight (namely the mass difference is lower than 0.1 percent before and after drying for 24 hours).
And then placing the dry mixed gel in a tubular furnace, heating to 900 ℃ at the speed of 2 ℃/min in the nitrogen atmosphere, preserving the heat for 1.5h, and naturally cooling to obtain the strontium and zinc co-doped titanium dioxide/carbon aerogel composite material.
The strontium and zinc co-doped titanium dioxide/carbon aerogel composite material obtained in the example was subjected to a nitrogen adsorption desorption test, and the specific surface area calculated by a BET formula was 1146.75m2(iv) g. The composite material is used for treating solubilized organic sewage, wherein a surfactant contained in the solubilized sewage is triton 100(2.2mmol/L, which is equivalent to 10 times of CMC), and an organic pollution organic matter is phenanthrene (50 mg/L); under the irradiation of a 100W ultraviolet lamp, 0.5g of the composite material is taken to carry out photocatalytic degradation on 50ml of solubilized organic sewage, the degradation time is 360min, the concentration of phenanthrene is measured by liquid chromatography, and the degradation efficiency of the phenanthrene is 92.27%. The degradation efficiency of the concentration of triton 100 was 8.84% as determined by liquid chromatography.
Example 2
Uniformly mixing 6.9ml of formaldehyde aqueous solution (37 wt%), 0.026g of zinc chloride and 0.106g of strontium chloride (the molar ratio is 1:0.002:0.007) under the condition of ice-water bath at the temperature of 0 ℃, and marking as a mixture A;
uniformly mixing 4.4g of resorcinol, 2.02g of phloroglucinol, 0.36g of oxalic acid, 0.64g of titanium dioxide nanoparticles and 15ml of water (the molar ratio is 1:0.40:0.10:0.2:20.83) at room temperature, and marking as a mixture B;
the mixture A and the mixture B were mixed at 30 ℃ for 0.5h with stirring to give a mixed gel.
Transferring the mixed gel into a container containing an acetone solvent, keeping the mixed gel immersed in a water bath environment at 45 ℃ for 48 hours, and replacing the solvent acetone for 3 times (once every 6 hours) again;
and taking out the mixed gel soaked by the acetone, placing the mixed gel in an open normal-temperature normal-pressure environment, standing and drying the mixed gel to constant weight (namely the mass difference is lower than 0.1 percent before and after drying for 24 hours).
And then placing the dry mixed gel in a tube furnace, heating to 800 ℃ at the speed of 3 ℃/min in the helium atmosphere, preserving heat for 1h, and naturally cooling to obtain the strontium and zinc co-doped titanium dioxide/carbon aerogel composite material.
The strontium and zinc co-doped titanium dioxide/carbon aerogel composite material obtained in the example was subjected to a nitrogen adsorption desorption test and measured by BETThe specific surface area is calculated to be 789.46m2(ii) in terms of/g. The composite material is used for treating solubilized organic sewage, wherein a surfactant contained in the solubilized organic sewage is sodium dodecyl benzene sulfonate (6mmol/L, which is equivalent to 5 times of CMC), and an organic pollution organic matter is pentachlorophenol (30 mg/L); under the irradiation of a 200W ultraviolet lamp, 0.5g of the composite material is taken to carry out photocatalytic degradation on 50ml of solubilized organic sewage, the degradation time is 360min, the concentration of pentachlorophenol is determined by liquid chromatography, and the degradation efficiency is determined to be 85.75%; the methylene blue spectrophotometry method is used for measuring the concentration of the sodium dodecyl benzene sulfonate, and the degradation efficiency is 10.18%.
Example 3
Uniformly mixing 6.9ml of formaldehyde aqueous solution (37 wt%), 0.065g of zinc chloride and 0.136g of strontium chloride (molar ratio is 1: 0.005: 0.009) under the condition of ice-water bath at 0 ℃, and marking as a mixture A;
uniformly mixing 4.4g of resorcinol, 2.26g of phloroglucinol, 0.54g of oxalic acid, 2.55g of titanium dioxide nanoparticles and 15ml of water (the molar ratio is 1:0.45:0.15:0.8:20.83) at room temperature, and marking as a mixture B;
the mixture A and the mixture B were mixed with stirring at 50 ℃ for 1 hour to obtain a mixed gel.
Transferring the mixed gel into a container containing an acetone solvent, keeping the mixed gel immersed in a water bath environment at 60 ℃ for 36 hours, and replacing the solvent acetone for 5 times (once every 6 hours) again;
and taking out the mixed gel soaked by the acetone, placing the mixed gel in an open normal-temperature normal-pressure environment, standing and drying the mixed gel to constant weight (namely the mass difference is lower than 0.1 percent before and after drying for 24 hours).
And then placing the dry mixed gel in a tubular furnace, heating to 1000 ℃ at the speed of 4 ℃/min under the argon atmosphere, preserving the heat for 1.5h, and naturally cooling to obtain the strontium and zinc co-doped titanium dioxide/carbon aerogel composite material.
The strontium and zinc co-doped titanium dioxide/carbon aerogel composite material obtained in the example was subjected to a nitrogen adsorption desorption test, and the specific surface area calculated by a BET formula was 842.42m2(ii) in terms of/g. The composite material is used for treating solubilized organic sewage containing surface activityThe sex agent is Tween 80(28mmol/L, which is equivalent to 2 times of CMC), and the organic pollution organic matter is naphthalene (100 mg/L); under the irradiation of a 50W ultraviolet lamp, 0.5g of the composite material is taken to carry out photocatalytic degradation on 50ml of solubilized organic sewage, the degradation time is 360min, the concentration of naphthalene is measured by liquid chromatography, and the degradation efficiency is 84.18%; the degradation efficiency of tween 80 was measured by interfacial tension method to be 9.54%.
Comparative example 1
The difference from example 1 is that zinc chloride and strontium chloride were not added to the mixture A, which was subjected to a nitrogen adsorption desorption test and a specific surface area of 368.78m was calculated from the BET formula2/g。
From the experimental data of comparative example 1, it can be confirmed that the addition of zinc atoms and strontium atoms has a great influence on the specific surface area of the composite material.
Comparative example 2
The difference from example 1 is that zinc chloride was not added to the mixture A, a nitrogen adsorption desorption test was conducted thereon, and the specific surface area was 531.84m as calculated from the BET formula2/g。
The experimental data of comparative example 2 prove that the addition of strontium atoms has a small influence on the specific surface area of the composite material, and the degree of strontium and zinc co-doping is far not reached.
Comparative example 3
The difference from example 1 is that strontium chloride was not added to the mixture A, a nitrogen adsorption desorption test was conducted thereon, and the specific surface area was 987.25m as calculated from the BET formula2/g。
The experimental data of comparative example 3 prove that the addition of zinc atoms has a great influence on the specific surface area of the composite material, but the degree of strontium and zinc co-doping is not reached. The high specific surface area characteristic of the strontium and zinc co-doped titanium dioxide/carbon aerogel composite material is the result under the combined action of zinc and strontium elements.
Comparative example 4
The difference from example 1 is that zinc chloride and strontium chloride are not added to the mixture A, and the mixture A is used in the same solubilizing wastewater treatment evaluation system as in example 1, the degradation efficiency of phenanthrene is only 48.15%, and the degradation efficiency of triton 100 is 15.58%.
From the experimental data of comparative example 4, it can be shown that the addition of zinc atoms and strontium atoms has a decisive influence on the capacity and selectivity of the composite material for degrading, solubilizing, wastewater treating and solubilizing organic pollutants.
Comparative example 5
The difference from the example 1 is that zinc chloride is not added into the mixture A, and the mixture A is used in the same solubilizing wastewater treatment evaluation system as the example 1, the degradation efficiency of phenanthrene is only 67.15%, and the degradation efficiency of Triton 100 is 12.08%
From the experimental data of comparative example 5, it can be shown that the addition of strontium atoms has a certain degree of influence on the ability and selectivity of the composite material to degrade, dissolve and waste water treatment and dissolve organic pollutants (mainly promoting in the aspect of promoting photocatalytic degradation), but does not reach the degree of strontium and zinc co-doping.
Comparative example 6
The difference from example 1 is that strontium chloride is not added to the mixture A, and the degradation efficiency of phenanthrene is only 75.48% and the degradation efficiency of triton 100 is 11.57% when the mixture A is used in the same dissolution wastewater treatment evaluation system as in example 1.
From the experimental data of comparative example 6, it can be proven that the addition of zinc atoms has a certain degree of influence on the degradation and solubilization of the composite material, the capacity of treating and solubilizing organic pollutants in wastewater and the selectivity (mainly increasing the specific surface area and promoting the adsorption of pollutants), but does not reach the strontium and zinc co-doping degree.
Comparative example 7
The difference from example 1 is that the atmosphere of the calcination treatment was air, which was subjected to a nitrogen adsorption desorption test and a specific surface area of 125.16m was calculated from the BET formula2/g。
From the experimental data of comparative example 7, it can be proved that the air calcination atmosphere has a severe influence on the carbon element of the composite material, and the specific surface area of the strontium and zinc co-doped titanium dioxide/carbon aerogel composite material is seriously reduced.
When the test piece was used in the same dissolution-increasing wastewater treatment evaluation system as in example 1, the degradation efficiency of phenanthrene was only 38.15%, and the degradation efficiency of triton 100 was 5.18%. The low specific surface area results in a severe reduction in the catalytic degradation efficiency thereof.
TABLE 1
Figure BDA0003522761600000071
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, it is possible to make various changes and modifications without departing from the concept of the present invention, and these are all within the scope of the present invention.

Claims (10)

1. The preparation method of the composite photocatalytic material is characterized by comprising the following steps:
uniformly mixing a formaldehyde water solution, a zinc salt and a strontium salt under the condition of ice-water bath at 0 ℃, and marking as a mixture A, wherein the mass ratio of formaldehyde to zinc chloride to strontium chloride is 1: 0.0005-0.008: 0.001-0.01;
step two, uniformly mixing resorcinol, phloroglucinol, oxalic acid, titanium dioxide nano-particles and water at room temperature, and marking as a mixture B; wherein the mass ratio of resorcinol, phloroglucinol, oxalic acid, titanium dioxide nanoparticles to water is 1: 0.10-0.50: 0.01-0.20: 0.10-1.00: 10-30 parts of;
step three, stirring and mixing the mixture A and the mixture B for 0.5 to 1 hour at the temperature of between 15 and 50 ℃ to obtain mixed gel, transferring the gel into an acetone solvent environment for soaking, and keeping the temperature of the gel for soaking for 36 to 72 hours at the temperature of between 30 and 60 ℃;
and step four, air-drying the soaked gel at normal temperature to constant weight, placing the gel in a tubular furnace, calcining the gel in an oxygen-free environment at the temperature of 800-1000 ℃ for 1-3 hours to obtain the composite photocatalytic material.
2. The preparation method according to claim 1, wherein the zinc salt is zinc chloride or nitrate or sulfate or acetate; the strontium salt is strontium chloride, strontium nitrate or strontium acetate.
3. The preparation method according to claim 1, wherein the mass ratio of the formaldehyde to the zinc chloride to the strontium chloride is 1: 0.0005-0.004: 0.002-0.008.
4. The preparation method according to claim 1, wherein the mass ratio of resorcinol, phloroglucinol, oxalic acid, titanium dioxide nanoparticles and water in the mixture B is 1: 0.10-0.40: 0.01-0.10: 0.20-0.70: 10-30.
5. The method according to claim 1, wherein the acetone solution is replaced 1-10 times during the soaking in the mixed gel acetone solvent environment.
6. The method according to claim 1, wherein the temperature increase rate of calcination is 1 to 5 ℃/min.
7. The composite photocatalytic material prepared by the preparation method of any one of claims 1 to 6 has a carbon aerogel skeleton, and titanium dioxide, zinc titanate and strontium titanate nanocrystals are loaded on the skeleton.
8. Use of the composite photocatalytic material according to claim 7 in photocatalytic treatment of solubilized organic wastewater.
9. The use of claim 8, wherein the solubilized organic wastewater contains PAHs and HOCs in a concentration of 1-100 mg/L; the surfactant in the sewage is one or a mixture of anionic surfactant and nonionic surfactant, and the concentration of the surfactant is 2-20 times of CMC.
10. Use according to claim 9, wherein the contaminant is phenanthrene, naphthalene or pentachlorophenol; the surfactant is sodium dodecyl benzene sulfonate, triton 100 or tween 80.
CN202210185963.8A 2022-02-28 2022-02-28 Composite photocatalytic material, preparation method and application Pending CN114713210A (en)

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