CN107715698A - A kind of preparation method of purification membrane material for landscape water and products obtained therefrom and application - Google Patents

Abstract

The invention discloses a preparation method of a membrane material used for landscape water purification, and the resulting product and application. TiO2 nano powder is uniformly dispersed in ethanol, then PET toluene solution is added, mixed evenly, and then the solvent is partially evaporated to obtain A viscous pasty liquid; finally, the pasty liquid is evenly applied to one surface of the PET film to obtain a membrane material for landscape water purification. The invention uses a special method to firmly attach nano-titanium dioxide to the PET film, which solves the problems of poor dispersion, difficult recovery, and poor catalytic effect in water bodies. It can be directly spread in landscape water when used, which is simple and easy. It has strong operability and can be directly taken out and reused after treatment. It has a good effect on degrading organic matter and purifying water quality in landscape water. It is suitable for landscape water of various shapes and scales, especially suitable for the diverse needs of current landscape water treatment. The application prospect is broad.

Description

A kind of preparation method for the purification membrane material of landscape water and obtained product and application

technical field

The invention relates to the preparation of a photocatalyst material for artificial landscape water, in particular to a preparation method for a purification membrane material for landscape water, the obtained product and its application, and belongs to the technical field of landscape water treatment and environment improvement.

Background technique

Landscape water usually refers to water bodies used for visual appreciation, most of which are stagnant water, exposed to the ground, have very low self-purification ability, and are very easy to be polluted. After eutrophication, aquatic plants and algae are easy to breed, and if left untreated for a long time, it will also bring odor. Affecting its ornamental value, the secondary treatment of landscape water has become the focus of attention. If there is no sewage, the main pollution factors of landscape water are as follows:

1. Rainwater: contains organic matter and nitrogen and phosphorus elements on the surface and in the soil;

2. Dust in the environment contains foreign organic matter, nitrogen, phosphorus and other pollutants;

3. Organic matter accumulated by unknown organisms that are constantly deriving and dying in the landscape water body;

4. Algae pollution caused by sun exposure.

The key to landscape water treatment is simplicity, ease, and low cost. Nano-TiO ₂ materials have high treatment efficiency and low cost in the field of landscape water treatment, so they have attracted attention in recent years. But its development is not optimistic, because nanomaterials have a large specific surface area and poor recyclability. Direct use is not only costly, but also causes secondary pollution. Therefore, the focus of the application of nanomaterials in this field has shifted to the operability of the technology, namely Solve the monodispersity and stability of properties of nanomaterials during use.

Contents of the invention

Aiming at the deficiency of nano- _TiO2 materials in treating landscape water, the present invention provides a method for preparing a membrane material for landscape water purification and the resulting product. The present invention adopts a special method to monodisperse nano- _TiO2 particles on the surface of PET film , not only the method is simple and easy, the cost is low, and the operability is strong, but also the monodisperse characteristics of nano- _{TiO 2 are} maintained. Secondary pollution, especially suitable for the diverse needs of the current landscape water treatment.

The present invention also provides a landscape water treatment method, which uses the landscape water purification membrane material prepared by the present invention to treat landscape water. The purification membrane material can degrade organic matter very well, and is easy to use and easy to operate. Simple, easy to adjust in shape and size, can be directly laid on the surface of landscape water, low technical operation does not require professional training, easy to recycle, can be reused after recycling, low cost, suitable for landscape water of various scales and structures, applicable Wide range, especially suitable for the current landscape water treatment needs.

Concrete technical scheme of the present invention is as follows:

A method for preparing a membrane material for landscape water purification, the method comprising the following steps:

(1) Evenly disperse the _TiO2 nanopowder in ethanol, then add the PET toluene solution, stir evenly to obtain a uniform dispersion;

(2) Evaporate part of the solvent in the above uniform dispersion until a viscous pasty liquid is obtained;

(3) Apply the above-mentioned pasty liquid evenly to one side of the PET film, and dry it to obtain a membrane material for landscape water purification.

In the above step (1), the mass ratio of TiO ₂ nanometer powder, ethanol, PET, and toluene is 1:10:0.1:20-40. In the present invention, PET is selected as the binder of titanium dioxide nanometer powder, so that it can adhere more firmly on the surface of the PET film. Through the selection and dosage adjustment of ethanol and toluene solvent, titanium dioxide nanometer powder can be uniformly mixed with PET.

In the above step (1), the _TiO2 nanopowder is uniformly dispersed in ethanol under strong stirring. TiO ₂ nanopowder is any nanoscale titanium dioxide with photocatalytic effect.

In the above step (2), the solvent ethanol and toluene are recovered by using a rotary evaporator. It has been verified by experiments that when 80% of the total volume of ethanol and toluene is evaporated by a rotary evaporator, the required viscous pasty liquid is obtained.

In the above step (3), the coating method is spin coating, screen printing, laser printing or inkjet printing. The operation methods of these methods are all recorded in the prior art, and those skilled in the art can easily accomplish. The paste liquid can be coated with a thin layer on the PET film, so that the titanium dioxide nano-powder is monodispersed (that is, not agglomerated) on the PET film and retains its photocatalytic properties.

In the above step (3), the obtained landscape water purification membrane material consists of a PET film and a TiO ₂ coating on one surface of the PET film. The thickness of the TiO ₂ coating is less than 1 micron, such as 0.1-0.99 micron.

The purification membrane material for landscape water obtained in the present invention is simple to prepare and low in cost, and can be directly added to landscape water for use. According to the area and shape of landscape water, the shape and size of the purification membrane material can be flexibly adjusted. Under the irradiation of natural light, through The role of nano-titanium dioxide can degrade organic matter in landscape water and play a role in purifying water quality. The purified membrane material after treatment can be taken out directly and reused, with broad application prospects. Therefore, the purification membrane material for landscape water is also within the protection scope of the present invention.

The present invention also provides a landscape water treatment method, which comprises: spreading the above-mentioned purification membrane material for landscape water on the landscape water surface to treat the landscape water.

Further, when in use, the above-mentioned purification membrane material for landscape water is laid where there is a water surface, and the shape and size of the purification membrane material for landscape water are tailored according to the shape of the water body. The purification membrane material used for landscape water is pasted on the water surface, and the side coated with TiO ₂ is in contact with the water surface, and can receive sunlight for photocatalytic degradation of organic matter in the water. After using the purification membrane material for landscape water of the present invention, organic matter in water can be removed, odor can be eliminated, and clean water quality can be obtained.

When using the purification membrane material for landscape water of the present invention to treat landscape water, the purification time varies with the degree of water pollution, and generally about 2 weeks can achieve a good purification effect. After the purification is completed, it can be directly taken out of the water, which is convenient for recycling. The recovered purification membrane material can be recycled after being dried, usually 4 times.

The invention adopts a special method to firmly attach nano-titanium dioxide to the PET film to make a purification film material for landscape water. The purification membrane material for landscape water solves the shortcomings of poor dispersion of nano-titanium dioxide, difficulty in recycling, and poor catalytic effect in water bodies. It can be directly spread in landscape water when in use. It can be taken out directly and reused without causing secondary pollution. The purification membrane material used for landscape water of the present invention is simple to prepare and low in cost, maintains the monodisperse characteristics and photocatalytic performance of _TiO2 nano powder, plays a very good role in degrading organic matter and purifying water quality in landscape water, and is suitable for various shapes Landscape water with large scale and large scale is especially suitable for the diverse needs of current landscape water treatment, and has broad application prospects.

detailed description

The present invention will be further elaborated by the following examples. It should be understood that the following descriptions are only for explaining the present invention, and the content thereof is not limited.

Example 1

1.1 Add 0.1g of PET powder into 30g of toluene and stir evenly to obtain PET toluene solution; disperse 1g of _TiO2 nano powder (P25) into 10g of ethanol under strong stirring, then add PET toluene solution and stir evenly , to obtain a uniform dispersion;

1.2 Use a rotary evaporator to process the uniform dispersion obtained in Example 1.1, remove ethanol and toluene by rotary evaporation, stop when the total volume of ethanol and toluene is removed by 80%, and obtain a viscous pasty liquid;

1.3 Utilize the method for spin-coating that embodiment 1.2 obtained pasty liquid is coated on one surface of PET film, obtain the purification membrane material that is used for landscape water after drying; On this purification membrane material _TiO 2thickness of coating is 0.99 microns.

Example 2

2.1 Add 0.1g of PET powder into 40g of toluene and stir evenly to obtain PET toluene solution; disperse 1g of _TiO2 nano powder (P25) into 10g of ethanol under strong stirring, then add PET toluene solution and stir evenly , to obtain a uniform dispersion;

2.2 Use a rotary evaporator to process the uniform dispersion obtained in Example 2.1, remove ethanol and toluene by rotary evaporation, stop when the total volume of ethanol and toluene is removed by 80%, and obtain a viscous pasty liquid;

2.3 Utilize the method for laser printing to apply the pasty liquid obtained in embodiment 2.2 on one surface of the PET film, and obtain the purification membrane material used for landscape water after drying, on the purification membrane material the _TiO The thickness of the coating is 0.1 micron.

Example 3

3.1 Add 0.1g of PET powder into 20g of toluene and stir evenly to obtain a PET toluene solution; disperse 1g of _TiO2 nano powder (P25) into 10g of ethanol evenly under strong stirring, then add PET toluene solution and stir evenly , to obtain a uniform dispersion;

3.2 Use a rotary evaporator to process the uniform dispersion obtained in Example 3.1, remove ethanol and toluene by rotary evaporation, stop when the total volume of ethanol and toluene is removed by 80%, and obtain a viscous pasty liquid;

3.3 Utilize the ink-jet printing method to apply the pasty liquid obtained in Example 3.2 to one surface of the PET film, and obtain the purification membrane material for landscape water after drying, and the _TiO on the purification membrane material The thickness of the coating 0.3 microns.

Example 4

4.1 Add 0.1g of PET powder into 35g of toluene and stir evenly to obtain PET toluene solution; disperse 1g of _TiO2 nano powder (P25) into 10g of ethanol evenly under strong stirring, then add PET toluene solution and stir evenly , to obtain a uniform dispersion;

4.2 Use a rotary evaporator to process the uniform dispersion obtained in Example 4.1, remove ethanol and toluene by rotary evaporation, stop when the total volume of ethanol and toluene is removed by 80%, and obtain a viscous pasty liquid;

4.3 Utilize the method for screen printing to apply the pasty liquid obtained in embodiment 4.2 to one surface of the PET film, and obtain the purification membrane material used for landscape water after drying, on the purification membrane material the _TiO2 thickness of the coating 0.6 microns.

Comparative example 1

1.1 Disperse 10 grams of _TiO2 nanopowder (P25) evenly into 30 grams of ethanol under strong stirring, then add 60 grams of toluene, stir well to obtain a uniform dispersion;

1.2 Use a rotary evaporator to process the uniform dispersion obtained in 1.1, remove ethanol and toluene by rotary evaporation, stop when the total volume of ethanol and toluene is removed by 80%, and obtain the remaining dispersion;

1.3 Apply the remaining dispersion liquid obtained in 1.2 to one surface of the PET film by spin coating, and obtain a membrane material for landscape water purification after drying.

Comparative example 2

2.1 Add 1 gram of PET powder into 50 g of toluene, and stir evenly to obtain PET toluene solution; disperse 10 grams of _TiO2 nanometer powder (P25) into 30 g of ethanol under strong stirring, then add PET toluene solution, and stir well , the resulting mixture is not uniform;

2.2 Use a rotary evaporator to process the mixed solution obtained in 2.1, remove ethanol and toluene by rotary evaporation, stop when the total volume of ethanol and toluene is removed by 80%, and obtain the residue;

2.3 Apply the residue obtained in 2.2 to one surface of the PET film by spin coating, and obtain a membrane material for landscape water purification after drying. The results showed that _TiO2 was not uniformly distributed on the PET film.

Comparative example 3

The membrane material for landscape water purification was prepared according to the method of Example 1, except that the PET powder in step 1 was replaced with PVP powder.

Firmness test

The products prepared in the above examples and comparative examples were respectively cut into small pieces, spread in containers filled with tap water, wherein the side coated with titanium dioxide was in contact with the water surface. Take it out after standing for two weeks, put it in water for two weeks after drying, and observe the change of the coating. The results show that the products of Examples 1-4 and Comparative Example 2 have no change after being put into water for two times, and the coating does not fall off, and is still firmly attached to the PET surface. After the product of Comparative Example 1 is taken out of the water for the first time Titanium dioxide has shedding phenomenon, and the product of comparative example 3 has no shedding phenomenon after taking out the coating for the first time, but the coating part falls off after taking out from the water for the second time.

Water purification experiment

The purification membrane material for landscape water prepared by the present invention can be used for landscape water treatment, the steps are: according to the shape of landscape water, the purification membrane material for landscape water is cut into a corresponding shape, and then spread on the landscape water, The side coated with titanium dioxide faces the water surface, and the membrane material used for landscape water purification is pasted on the water surface after paving, and the side coated with TiO ₂ is in contact with the water surface. The purification membrane material can realize the degradation of organic matter in the landscape water. After the treatment, it can be taken out of the water, and it can be recycled after being dried in the sun. The service life is generally 4 times.

The purification membrane material used for landscape water of the invention can degrade organic matter, deodorize and purify landscape water. In order to verify the purification effect of the membrane material used for landscape water purification according to the present invention, the following experiments were carried out. The steps are as follows: take the landscape of a certain residential area as the experimental object. The landscape is in the shape of a rockery with water bodies around the rockery. The landscape is circular with a diameter of about 20m. The water body in this landscape contains less algae and suspended matter, the water is turbid, and has a fishy smell in summer. The landscape water purification membrane material according to Example 1 of the present invention was spread in the landscape water body, the side coated with titanium dioxide was in contact with the water surface, and the water quality was observed every 2 days after spreading. The results showed that with the prolongation of time, the stench of the landscape water gradually decreased, and the color of the water also gradually became lighter. After two weeks, the peculiar smell of the water body disappeared and the water quality became clear, but the algae and suspended matter in the water body did not change significantly. It can be seen that the product of the present invention has a good degradation treatment effect on organic matter, and has little effect on algae and suspended matter.

Claims (9)

1. A kind of 1. preparation method of purification membrane material for landscape water, it is characterized in that comprising the following steps：

   （1）By TiO₂Nano powder is evenly spread in ethanol, is then added PET toluene solution, is stirred, uniformly divided Dispersion liquid；

   （2）Solvent content in above-mentioned uniform dispersion is evaporated, until obtaining sticky liquid/paste；

   （3）Above-mentioned liquid/paste is uniformly coated to the one side of PET film, dries, obtains the purification membrane material for landscape water.
2. 2. preparation method according to claim 1, it is characterized in that：Step（1）In, TiO₂Nano powder, ethanol, PET, toluene Mass ratio be 1:10:0.1：20-40.
3. 3. preparation method according to claim 1 or 2, it is characterized in that：Step（1）In, TiO₂Nano powder is under strong stirring Evenly spread in ethanol.
4. 4. preparation method according to claim 1, it is characterized in that：Step（2）In, evaporate ethanol using Rotary Evaporators With the 80% of toluene cumulative volume, sticky liquid/paste is obtained.
5. 5. preparation method according to claim 1, it is characterized in that：Step（3）In, described painting method is spin coating, silk Wire mark brush, laser printing or inkjet printing.
6. 6. preparation method according to claim 1, it is characterized in that：Step（3）In, the purification membrane material of gained landscape water by PET film and the TiO positioned at the one of surface of PET film₂Coating forms, TiO₂The thickness of coating is less than 1 micron.
7. 7. it is used for according to made from the preparation method for the purification membrane material of landscape water any one of claim 1-6 The purification membrane material of landscape water.
8. 8. a kind of landscape method for treating water, it is characterized in that：The purification membrane material for landscape water described in claim 7 is tiled In landscape water surface, landscape water is handled.
9. 9. landscape method for treating water according to claim 8, it is characterized in that：It is coated with TiO₂One side contacted with the water surface.