阅读说明：本技术 一种高性能光催化膜的制备方法 (Preparation method of high-performance photocatalytic film ) 是由 姚博 于 2019-11-26 设计创作，主要内容包括：本发明属于光催化领域,具体涉及一种高性能光催化膜的制备方法,包括如下步骤：步骤1,将聚乙烯醇加入至蒸馏水中超声搅拌,然后加入十二烷基硫酸钠,形成粘稠液；步骤2,将粘稠液均匀平铺在基板上,恒温烘干得到分布均匀的底膜；步骤3,将无水乙醇加入至钛酸正丁酯中,形成粘稠的钛醇液；步骤4,将钛醇液喷洒在底膜表面,并恒温渗透得到第一薄膜；步骤5,将第一薄膜放入恒温釜中恒温烧结反应5-10h,得到高性能光催化膜。本发明解决了聚苯胺和聚吡咯处理困难的问题,利用聚乙烯醇烧结后形成共轭双键结构,形成导电聚合物,实现了光催化电子的快速转移,有效的提升了降解效率。(The invention belongs to the field of photocatalysis, and particularly relates to a preparation method of a high-performance photocatalytic film, which comprises the following steps: step 1, adding polyvinyl alcohol into distilled water, ultrasonically stirring, and then adding sodium dodecyl sulfate to form viscous liquid; step 2, uniformly and flatly paving the viscous liquid on a substrate, and drying at constant temperature to obtain a uniformly distributed bottom film; step 3, adding absolute ethyl alcohol into n-butyl titanate to form viscous titanium alcohol liquid; step 4, spraying titanium alcohol solution on the surface of the basement membrane, and permeating at constant temperature to obtain a first membrane; and 5, putting the first film into a constant-temperature kettle for constant-temperature sintering reaction for 5-10 hours to obtain the high-performance photocatalytic film. The invention solves the problem that polyaniline and polypyrrole are difficult to treat, and the polyvinyl alcohol is sintered to form a conjugated double bond structure to form a conductive polymer, so that the photocatalytic electron is rapidly transferred, and the degradation efficiency is effectively improved.)

1. A preparation method of a high-performance photocatalytic film is characterized by comprising the following steps: the method comprises the following steps:

step 1, adding polyvinyl alcohol into distilled water, ultrasonically stirring, and then adding sodium dodecyl sulfate to form viscous liquid;

step 2, uniformly and flatly paving the viscous liquid on a substrate, and drying at constant temperature to obtain a uniformly distributed bottom film;

step 3, adding absolute ethyl alcohol into n-butyl titanate to form viscous titanium alcohol liquid;

step 4, spraying titanium alcohol solution on the surface of the basement membrane, and permeating at constant temperature to obtain a first membrane;

and 5, putting the first film into a constant-temperature kettle for constant-temperature sintering reaction for 5-10 hours to obtain the high-performance photocatalytic film.

2. The method for producing a high-performance photocatalytic film according to claim 1, wherein: stirring and mixing the polyvinyl alcohol in the step 1 in distilled water to form a saturated solution of the polyvinyl alcohol, wherein the ultrasonic stirring temperature is 70-80 ℃, and the ultrasonic frequency is 30-60 kHz.

3. The method for producing a high-performance photocatalytic film according to claim 1, wherein: the adding amount of the sodium dodecyl sulfate in the step 1 is 0.6-1.5% of the mass of the polyvinyl alcohol.

4. The method for producing a high-performance photocatalytic film according to claim 1, wherein: the spreading amount of the viscous fluid in the step 2 is 2-6g/cm²The constant temperature drying temperature is 100-120 ℃.

5. The method for producing a high-performance photocatalytic film according to claim 1, wherein: the mass ratio of the absolute ethyl alcohol to the n-butyl titanate in the step 3 is 2: 7-9.

6. The method for producing a high-performance photocatalytic film according to claim 1, wherein: the spraying amount of the titanium alcohol solution in the step 4 is 2-5mL/cm²The constant temperature permeation adopts two-gradient heating reaction, and the specific procedure is as follows: the temperature of the first gradient is 50-60 deg.C, and the time is 30-60min, and the temperature of the second gradient is 80-100 deg.C, and the time is 2-4 h.

7. The method for producing a high-performance photocatalytic film according to claim 1, wherein: the constant-temperature sintering temperature in the step 5 is 260-300 ℃.

Technical Field

The invention belongs to the field of photocatalysis, and particularly relates to a preparation method of a high-performance photocatalytic film.

Background

The titanium dioxide is a photocatalyst which has high efficiency, no toxicity, stable chemical property, strong photo-oxidation resistance and low price. Titanium dioxide photocatalysis/photoelectrocatalysis technology draws extensive attention in the aspect of toxic and difficult biochemical degradation organic wastewater and waste gas treatment application. The nano titanium dioxide has high degradation efficiency, but can only carry out photocatalytic reaction under the irradiation of ultraviolet light, and the separation rate of photoproduction electrons and holes still needs to be improved. In order to improve the performance of titanium dioxide, preparing a titanium dioxide composite material and changing the application form of the titanium dioxide composite material become one of the key directions of titanium dioxide research. Metals, metal oxides, graphite, organic materials, and the like have all been used to prepare titanium dioxide composites. At present, polypyrrole and polyaniline are taken as main organic matters, and although the two organic matters can form good conductivity and realize rapid transfer of photoproduction electrons, the polypyrrole and the polyaniline are insoluble in conventional solvents and have low practicability.

Disclosure of Invention

Aiming at the problems in the prior art, the invention provides a preparation method of a high-performance photocatalytic film, which solves the problem of difficult treatment of polyaniline and polypyrrole, and utilizes a conjugated double bond structure formed after polyvinyl alcohol sintering to form a conductive polymer, so that the rapid transfer of photocatalytic electrons is realized, and the degradation efficiency is effectively improved.

In order to achieve the technical purpose, the technical scheme of the invention is as follows:

a preparation method of a high-performance photocatalytic film comprises the following steps:

step 1, adding polyvinyl alcohol into distilled water, ultrasonically stirring, and then adding sodium dodecyl sulfate to form viscous liquid;

step 2, uniformly and flatly paving the viscous liquid on a substrate, and drying at constant temperature to obtain a uniformly distributed bottom film;

step 3, adding absolute ethyl alcohol into n-butyl titanate to form viscous titanium alcohol liquid;

step 4, spraying titanium alcohol solution on the surface of the basement membrane, and permeating at constant temperature to obtain a first membrane;

and 5, putting the first film into a constant-temperature kettle for constant-temperature sintering reaction for 5-10 hours to obtain the high-performance photocatalytic film.

Stirring and mixing the polyvinyl alcohol in the step 1 in distilled water to form a saturated solution of the polyvinyl alcohol, wherein the ultrasonic stirring temperature is 70-80 ℃, and the ultrasonic frequency is 30-60 kHz.

The adding amount of the sodium dodecyl sulfate in the step 1 is 0.6-1.5% of the mass of the polyvinyl alcohol.

The spreading amount of the viscous fluid in the step 2 is 2-6g/cm²The constant temperature drying temperature is 100-120 ℃.

The mass ratio of the absolute ethyl alcohol to the n-butyl titanate in the step 3 is 2: 7-9.

The spraying amount of the titanium alcohol solution in the step 4 is 2-5mL/cm²The constant temperature permeation adopts two-gradient heating reaction, and the specific procedure is as follows: the temperature of the first gradient is 50-60 deg.C, and the time is 30-60min, and the temperature of the second gradient is 80-100 deg.C, and the time is 2-4 h.

The constant-temperature sintering temperature in the step 5 is 260-300 ℃.

From the above description, it can be seen that the present invention has the following advantages:

1. the invention solves the problem that polyaniline and polypyrrole are difficult to treat, and the polyvinyl alcohol is sintered to form a conjugated double bond structure to form a conductive polymer, so that the photocatalytic electron is rapidly transferred, and the degradation efficiency is effectively improved.

2. The invention realizes the arrangement of the basement membrane by utilizing the water solubility of the polyvinyl alcohol and realizes the coating of the n-butyl titanate by a surface spraying method, thereby ensuring the combination of the polyvinyl alcohol and the titanium dioxide.

3. The invention utilizes the water solubility and the hot ethanol solubility of the lauryl sodium sulfate to realize the permeation of the titanium alcohol solution in the basement membrane and improve the permeation and combination effect of the n-butyl titanate in the polyvinyl alcohol.

4. In the sintering process, the invention not only can realize that polyvinyl alcohol is converted into a polymer containing conjugated double bonds, but also can convert n-butyl titanate into anatase titanium dioxide, and simultaneously, the lauryl sodium sulfate forms a porous structure, and the surface area of the photocatalytic film is increased and the degradation efficiency is improved by utilizing a condensation structure formed by the polymer.

Detailed Description

The present invention is described in detail with reference to examples, but the present invention is not limited to the claims.