CN113856756B - Ag/TiO 2 Preparation method and application of composite modified sponge - Google Patents

Ag/TiO 2 Preparation method and application of composite modified sponge Download PDF

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CN113856756B
CN113856756B CN202111201927.8A CN202111201927A CN113856756B CN 113856756 B CN113856756 B CN 113856756B CN 202111201927 A CN202111201927 A CN 202111201927A CN 113856756 B CN113856756 B CN 113856756B
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sponge
tio
drying
water
modified sponge
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CN113856756A (en
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任刚
王婷婷
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Jinan University
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Jinan University
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J31/00—Catalysts comprising hydrides, coordination complexes or organic compounds
    • B01J31/02—Catalysts comprising hydrides, coordination complexes or organic compounds containing organic compounds or metal hydrides
    • B01J31/06—Catalysts comprising hydrides, coordination complexes or organic compounds containing organic compounds or metal hydrides containing polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
    • B01J23/38—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals
    • B01J23/48—Silver or gold
    • B01J23/50—Silver
    • B01J35/39—
    • B01J35/60—
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/30—Treatment of water, waste water, or sewage by irradiation
    • C02F1/32—Treatment of water, waste water, or sewage by irradiation with ultraviolet light
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/72—Treatment of water, waste water, or sewage by oxidation
    • C02F1/725—Treatment of water, waste water, or sewage by oxidation by catalytic oxidation
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/72—Treatment of water, waste water, or sewage by oxidation
    • C02F1/74—Treatment of water, waste water, or sewage by oxidation with air
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/30—Organic compounds
    • C02F2101/34—Organic compounds containing oxygen
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/30—Organic compounds
    • C02F2101/38—Organic compounds containing nitrogen
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/30—Organic compounds
    • C02F2101/40—Organic compounds containing sulfur
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2305/00—Use of specific compounds during water treatment
    • C02F2305/10—Photocatalysts
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/30—Wastewater or sewage treatment systems using renewable energies
    • Y02W10/37—Wastewater or sewage treatment systems using renewable energies using solar energy

Abstract

The invention discloses an Ag/TiO 2 Preparation method and application of composite modified sponge. The method comprises the following steps: agNO was added to an ice-water bath 3 Added to NH 3 ·H 2 O is as follows; tetrabutyl titanate and isopropanol are added, and the mixed solution is heated for 12 hours at 130 ℃ after stirring; washing the precipitate to neutrality, drying, grinding into powder, adding into water, and ultrasonic treating to obtain mixed solution; shaking the modified sponge mixed solution in a shaking table, extruding redundant solution, and drying to obtain Ag/TiO 2 And (3) compounding the modified sponge. The Ag/TiO 2 The composite modified sponge combines the advantages of metal oxide and sponge, has lower removal rate of antibiotics under no other external conditions, and has better removal rate of antibiotics under ultraviolet irradiation.

Description

Ag/TiO 2 Preparation method and application of composite modified sponge
Technical Field
The invention belongs to the field of environmental protection and chemical separation, and in particular relates to Ag/TiO 2 Preparation method and application of composite modified sponge.
Background
Antibiotics are chemotherapeutic agents that inhibit or eliminate the growth of microorganisms (e.g., bacteria, fungi, or protozoa), and the widespread use of antibiotics results in large amounts of antibiotics being released into the environment, inevitably posing a potential threat to the environment in which we live, the ecosystem, and the health of humans. Antibiotics have been identified as emerging contaminants that threaten the natural environment and human health. Antibiotics are one of the important classes of these trace organic contaminants. Excretion of incompletely metabolized antibiotics by humans and animals is a major source of antibiotics in the environment.
The treatment of antibiotics remaining in the environment, for which biological, chemical and adsorption processes are the main major concern, is relatively difficult to implement becauseThe microorganism culture period is long, and the microorganism needs a specific environment for survival, and when the environment changes, the microorganism may not function or even die. Thus, the antibiotics are still more commonly used as chemical methods, which convert them into smaller organic substances by oxidation, and even mineralize them completely. However, the oxidation effect of pure oxidants is limited, and advanced oxidation is often carried out in combination with some other means. Therefore, the photocatalysis technology is generated, secondary pollution is not caused in the photocatalysis process, and the oxidation efficiency can be improved. The photocatalyst commonly used in the photocatalysis process is TiO 2 The catalytic efficiency is relatively good, and no toxic byproducts are produced. Studies have shown that when some other metals are added, it can be combined with TiO 2 Synergistic effects occur to promote the oxidation process. And likewise, tiO 2 The catalyst is loaded on a certain carrier, so that the specific surface area of the catalyst can be increased, the oxidation effect is enhanced, and the catalyst is favorable for recycling the catalyst.
Disclosure of Invention
To solve the disadvantages and shortcomings of the prior art, the primary object of the present invention is to provide an Ag/TiO 2 A preparation method of a composite modified sponge.
Another object of the present invention is to provide Ag/TiO prepared by the above method 2 And (3) compounding the modified sponge. The Ag/TiO 2 The composite modified sponge is prepared by modifying the sponge by using a surfactant and loading Ag/TiO on the sponge 2 The obtained composite material combines the advantages of metal oxide and sponge, and has better removal rate of antibiotics under ultraviolet irradiation.
It is still another object of the present invention to provide the above Ag/TiO 2 Application of the composite modified sponge.
The invention aims at realizing the following technical scheme:
Ag/TiO 2 The preparation method of the composite modified sponge comprises the following steps:
(1) Cutting sponge, soaking in absolute ethyl alcohol and ultrapure water, performing ultrasonic treatment, and airing the cleaned sponge for later use;
(2) AgNO was added to an ice-water bath 3 Added to NH 3 ·H 2 O is as follows; tetrabutyl titanate and isopropanol are added, and the mixed solution is heated for 12 hours at 130 ℃ after stirring; removing supernatant, and retaining precipitate for use;
(3) Washing the precipitate obtained in the step (2) to neutrality, drying, and grinding into powder to obtain Ag/TiO 2 A composite material;
(4) Taking the Ag/TiO prepared in the step (3) 2 Adding the composite material into water, and performing ultrasonic treatment to obtain a mixed solution for later use;
(5) Immersing the sponge treated in the step (1) in a sodium dodecyl benzene sulfonate (SDS) solution, placing the sponge on a shaking table for shaking, taking out the sponge after the soaking is finished, soaking with water to wash out the redundant sodium dodecyl benzene sulfonate on the sponge, extruding redundant water, and drying overnight to obtain a modified sponge;
(6) Placing the modified sponge prepared in the step (5) into the mixed solution prepared in the step (4), oscillating by a shaking table, extruding redundant solution, and drying to obtain Ag/TiO 2 And (3) compounding the modified sponge.
The ultrasonic treatment time in the step (1) is 15min.
AgNO in step (2) 3 The dosage ratio of tetrabutyl titanate to isopropanol is 50mg:3ml:3ml.
NH in step (2) 3 ·H 2 The mass fraction of O is 10%. AgNO for forming an ammonia solution of silver nitrate 3 With NH 3 ·H 2 Ratio of O substance>1/3。
The washing in the step (3) means washing with ultrapure water and absolute ethanol, and the drying is drying at 60℃for 2 hours.
The concentration of the mixed solution in the step (4) is 1-2g/L, and the ultrasonic treatment time is 30min.
The concentration of the sodium dodecyl benzene sulfonate solution in the step (5) is 2-3g/L; oscillating for 30min on a shaking table; the temperature of the drying was 30 ℃. The invention utilizes SDS to modify the sponge, and can better load Ag/TiO 2 。
The shaking table in the step (6) oscillates for 2 hours; the drying is to dry at 50 ℃ for 2 hours, during which time the sponge is turned over for several minutes, preventing the photocatalyst from depositing on one side of the sponge.
Ag/TiO obtained by the preparation method 2 The application of the composite modified sponge in treating slightly polluted water containing lincomycin hydrochloride.
Preferably, the concentration of the lincomycin hydrochloride in the slightly polluted water containing the lincomycin hydrochloride is less than or equal to 10mg.L -1 。
Preferably, the application comprises the steps of: taking two pieces of Ag/TiO 2 The composite modified sponge is placed in slightly polluted water containing lincomycin hydrochloride and reacts for 6-12h. During the reaction, the supernatant was taken at regular time intervals, filtered through a 0.45 μm filter and the residual concentration was determined using lc-ms (liquid chromatography mass spectrometry).
Compared with the prior art, the invention has the following advantages:
(1) The Ag/TiO of the invention adopted by the invention 2 The composite modified sponge is modified by sodium dodecyl benzene sulfonate, so that the amorphous composite metal oxide is easier to load on the surface and pore channels of the sponge. Ag/TiO prepared by the method 2 The composite modified sponge not only has a certain adsorption effect, but also can oxidize organic substances under ultraviolet irradiation, and has high removal efficiency.
(2) Ag/TiO according to the present invention 2 The preparation method of the composite modified sponge is simple, the use is convenient, the addition of large-scale equipment and structures is not needed, the composite modified sponge can be directly applied to a set of treatment flow, the preservation is convenient, and the effect is durable.
(3) Ag/TiO prepared by the method 2 The composite modified sponge is safe and pollution-free to use, and is based on a lump structure of the sponge, so that the sponge is convenient to recycle.
Drawings
FIG. 1 is a diagram of Ag/TiO in example 1 2 Influence of the composite modified sponge on degradation of lincomycin hydrochloride.
FIG. 2 is a diagram of Ag/TiO in example 1 2 The removal efficiency of the composite modified sponge after repeated use.
FIG. 3 is a diagram of Ag/TiO in example 3 2 Influence of the composite modified sponge on degradation of lincomycin hydrochloride.
Detailed Description
The present invention will be described in further detail with reference to examples and drawings, but embodiments of the present invention are not limited thereto. The raw materials related to the invention can be directly purchased from the market. For process parameters not specifically noted, reference may be made to conventional techniques.
Example 1
(1) Cutting sponge into uniform small cubes, soaking the obtained small sponge with anhydrous ethanol and ultrapure water to obtain a mass error of less than 0.005g, performing ultrasonic treatment for 15min, extruding with a needle cylinder to remove redundant ultrapure water and anhydrous ethanol, repeating the treatment twice, and airing the cleaned sponge for later use;
(2) In an ice-water bath, 50mg AgNO is accurately weighed 3 Added to a reactor containing 30ml of 10% NH 3 ·H 2 Magnetically stirring in a beaker of O for 30min for later use;
(3) Adding 3ml of tetrabutyl titanate and 3ml of isopropanol into the mixed solution in the step (2), and magnetically stirring for 30min for later use;
(4) Transferring the mixed solution obtained in the step (3) into a 100ml reaction kettle, placing the mixed solution into an oven, and heating the mixed solution at 130 ℃ for 12 hours; removing supernatant, and retaining precipitate for use;
(5) Washing the precipitate obtained in the step (4) with ultrapure water and absolute ethanol to neutrality, drying the precipitate in an oven at 60deg.C for 2 hr, and grinding into powder with a ceramic mortar to obtain Ag/TiO 2 A composite material;
(6) Accurately weighing 0.4g of Ag/TiO in the step (5) 2 Adding into 200ml of ultrapure water to prepare 2g/L Ag/TiO 2 Performing ultrasonic treatment on the aqueous solution for 30min for later use;
(7) Immersing the pretreated and cleaned sponge in 3.0g/L sodium dodecyl benzene sulfonate (SDS) solution, and placing the sponge on a shaking table for shaking to make the sponge fully contacted; taking out the sponge after 30min, soaking the sponge with ultrapure water to wash out redundant SDS on the sponge, removing redundant water by using a needle cylinder, and putting the sponge into a baking oven for overnight drying at 30 ℃ to obtain the modified sponge;
(8) Modifying the process prepared in step (7)Placing the sexual sponge into the mixed solution in the step (6), placing into a shaking table to shake for 2 hours, extruding redundant solution by using a needle cylinder, drying for 2 hours at 50 ℃ in an oven, turning the sponge for several minutes, and preventing photocatalyst from depositing on one side of the sponge to obtain Ag/TiO 2 And (3) compounding the modified sponge.
Ag/TiO prepared in this example 2 The application of the composite modified sponge in treating slightly polluted water containing lincomycin hydrochloride. The application comprises the following steps: taking two pieces of Ag/TiO 2 The composite modified sponge is added into 100mL of 10mg/L lincomycin hydrochloride micro-polluted water, and is subjected to 245mm ultraviolet irradiation for 6-12 hours, supernatant is taken at certain time intervals, a 0.45 mu m filter membrane is used for filtering, and the residual concentration is measured by using lc-ms, and the result is shown in figure 1. In addition, ag/TiO is added after the reaction is completed 2 The composite modified sponge is recycled and reused, tested by the same method, and after being reused for 5 times, ag/TiO 2 The removal rate of the compound modified sponge to the lincomycin hydrochloride can still reach more than 40 percent, as shown in figure 2.
In addition, through test verification, after the slightly polluted drinking water with the concentration of the lincomycin hydrochloride not higher than 10ppm is treated by the method, the output water lincomycin hydrochloride can be lower than 100ppb, and the limit value of the sanitary safety standard of the drinking water is reached; lincomycin hydrochloride concentration is not higher than 100 mg.L -1 After the treatment, the effluent lincomycin hydrochloride can be lower than 10mg.L -1 。
Example 2
(1) Cutting sponge into uniform small cubes, soaking the obtained small sponge with anhydrous ethanol and ultrapure water to obtain a mass error of less than 0.005g, performing ultrasonic treatment for 15min, extruding with a needle cylinder to remove redundant ultrapure water and anhydrous ethanol, repeating the treatment twice, and airing the cleaned sponge for later use;
(2) In an ice-water bath, 30mgAgNO is accurately weighed 3 Added to a reactor containing 30ml of 10% NH 3 ·H 2 Magnetically stirring in a beaker of O for 30min for later use;
(3) Adding 2ml of tetrabutyl titanate and 3ml of isopropanol into the mixed solution in the step (2), and magnetically stirring for 30min for later use;
(4) Transferring the mixed solution obtained in the step (3) into a 100ml reaction kettle, placing the mixed solution into an oven, and heating the mixed solution at 130 ℃ for 12 hours; removing supernatant, and retaining precipitate for use;
(5) Washing the precipitate obtained in the step (4) with ultrapure water and absolute ethanol to neutrality, drying the precipitate in an oven at 60deg.C for 2 hr, and grinding into powder with a ceramic mortar to obtain Ag/TiO 2 A composite material;
(6) Accurately weighing 0.2g of Ag/TiO in the step (5) 2 Adding into 200ml of ultrapure water to prepare 1g/L Ag/TiO 2 Performing ultrasonic treatment on the aqueous solution for 30min for later use;
(7) Immersing the pretreated and cleaned sponge in a sodium dodecyl benzene sulfonate (SDS) solution with the concentration of 2.0g/L, and placing the sponge on a shaking table for shaking to make the sponge fully contacted; taking out the sponge after 30min, soaking the sponge with ultrapure water to wash out redundant SDS on the sponge, removing redundant water by using a needle cylinder, and putting the sponge into a baking oven for overnight drying at 30 ℃ to obtain the modified sponge;
(8) Placing the modified sponge prepared in the step (7) into the mixed solution prepared in the step (6), placing into a shaking table to oscillate for 2 hours, extruding redundant solution by using a needle cylinder, drying for 2 hours at 50 ℃ in an oven, turning the sponge for a few minutes during the drying, and preventing photocatalyst from depositing on one side of the sponge to obtain Ag/TiO 2 And (3) compounding the modified sponge.
The invention also provides an Ag/TiO 2 The application of the composite modified sponge in treating slightly polluted water containing lincomycin hydrochloride. The application comprises the following steps: taking two pieces of Ag/TiO 2 100mL of 10mg/L lincomycin hydrochloride micro-polluted water is added into the composite modified sponge, 245mm ultraviolet light is added for reaction for 6-24 hours, the supernatant is taken at certain time intervals, a 0.45 mu m filter membrane is used for measuring the residual concentration by using lc-ms.
Test shows that the Ag/TiO of example 2 2 After the compound modified sponge is treated on the slightly polluted drinking water of 10ppm lincomycin hydrochloride, the treatment time is 24 hours, and the removal rate reaches 96.4 percent.
Example 3
Ag/TiO 2 The preparation method of the composite modified sponge was different from example 1 in that the pretreated and washed sponge was not immersed in a sodium dodecyl benzene sulfonate (SDS) solution, and the other steps were the same as example 1.
The procedure is as described in example 1: taking two pieces of Ag/TiO 2 100mL of 10mg/L lincomycin hydrochloride micro-polluted water is added into the composite modified sponge, 245mm ultraviolet irradiation is added for reaction for 6-12h, the supernatant is taken at certain time intervals, a 0.45 mu m filter membrane is used for filtering, and the residual concentration is measured by using lc-ms, and the result is shown in figure 3.
In addition, example 3 was experimentally verified, ag/TiO of example 3 2 After the compound modified sponge is used for treating 10ppm of slightly polluted drinking water containing lincomycin hydrochloride, the removal rate of the lincomycin hydrochloride is 59.1%. Thus, it was demonstrated that the sponge modified with sodium dodecyl benzene sulfonate (SDS) was further loaded with Ag/TiO 2 Has better advantages and larger advantages in application.
The above examples are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above examples, and any other changes, modifications, substitutions, combinations, and simplifications that do not depart from the spirit and principle of the present invention should be made in the equivalent manner, and the embodiments are included in the protection scope of the present invention.

Claims (7)

1. Ag/TiO 2 The application of the composite modified sponge in treating the slightly polluted water containing the lincomycin hydrochloride is carried out under ultraviolet irradiation, and is characterized in that the concentration of the lincomycin hydrochloride in the slightly polluted water containing the lincomycin hydrochloride is less than or equal to 10mg.L -1 ；
The Ag/TiO 2 The preparation method of the composite modified sponge comprises the following steps:
(1) Cutting sponge, soaking in absolute ethyl alcohol and ultrapure water, performing ultrasonic treatment, and airing the cleaned sponge for later use;
(2) AgNO was added to an ice-water bath 3 Added to NH 3 •H 2 O is as follows; adding tetrabutyl titanate and isopropanol, stirring, and heating at 130deg.C12h; removing supernatant, and retaining precipitate for use;
(3) Washing the precipitate obtained in the step (2) to neutrality, drying, and grinding into powder to obtain Ag/TiO 2 A composite material;
(4) Taking the Ag/TiO prepared in the step (3) 2 Adding the composite material into water, and performing ultrasonic treatment to obtain a mixed solution for later use;
(5) Immersing the sponge treated in the step (1) in a sodium dodecyl benzene sulfonate solution, oscillating on a shaking table, taking out the sponge after the soaking is completed, soaking with water to wash out redundant sodium dodecyl benzene sulfonate on the sponge, extruding redundant water, and drying overnight to obtain a modified sponge;
(6) Placing the modified sponge prepared in the step (5) into the mixed solution prepared in the step (4), oscillating by a shaking table, extruding redundant solution, and drying to obtain Ag/TiO 2 And (3) compounding the modified sponge.
2. The use according to claim 1, wherein AgNO in step (2) 3 The dosage ratio of tetrabutyl titanate to isopropanol is 50mg:3ml:3ml.
3. The use according to claim 1, wherein in step (2) NH 3 •H 2 The mass concentration of O is 10%.
4. The use according to claim 1, wherein the washing in step (3) is washing with ultrapure water and absolute ethanol and the drying is drying at 60 ℃ for 2 hours.
5. The use according to claim 1, wherein the concentration of the mixed liquor in step (4) is 1-2g/L and the ultrasonic treatment time is 30min.
6. The use according to claim 1, wherein the concentration of the sodium dodecyl benzene sulfonate solution in step (5) is 2-3g/L, the solution is shaken on a shaker for 30min, and the temperature of drying is 30 ℃.
7. The use according to claim 1, wherein in step (6) the shaking table is oscillated for a period of 2h, and the drying is carried out at 50 ℃ for 2 hours, during which time the sponge is turned over for several minutes.
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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104327243A (en) * 2014-10-30 2015-02-04 河海大学 Polyurethane foam loaded titanium dioxide and montmorillonite composite material and preparation method of composite material
CN109967074A (en) * 2019-03-20 2019-07-05 金华职业技术学院 A kind of preparation method and application of the titanium dioxide optical catalyst of silver load
CN110193357A (en) * 2019-06-27 2019-09-03 中素新科技有限公司 Composite sponge and its preparation method and application containing modified graphene
CN110270376A (en) * 2019-07-18 2019-09-24 深圳市深港产学研环保工程技术股份有限公司 Photocatalysis sponge and its preparation method and application for removing algae and water

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104327243A (en) * 2014-10-30 2015-02-04 河海大学 Polyurethane foam loaded titanium dioxide and montmorillonite composite material and preparation method of composite material
CN109967074A (en) * 2019-03-20 2019-07-05 金华职业技术学院 A kind of preparation method and application of the titanium dioxide optical catalyst of silver load
CN110193357A (en) * 2019-06-27 2019-09-03 中素新科技有限公司 Composite sponge and its preparation method and application containing modified graphene
CN110270376A (en) * 2019-07-18 2019-09-24 深圳市深港产学研环保工程技术股份有限公司 Photocatalysis sponge and its preparation method and application for removing algae and water

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