阅读说明：本技术 用于喷漆废水处理的纳米复合材料以及制备方法和应用 (Nano composite material for paint spraying wastewater treatment, preparation method and application ) 是由 陈莹钧 王娟 吴西林 于 2020-05-14 设计创作，主要内容包括：本发明提供了一种用于喷漆废水处理的纳米复合材料以及制备方法和应用,属于污水处理技术领域。它解决了现有无法采用简单、廉价的办法处理喷漆废水的问题。本用于喷漆废水处理的纳米复合材料的制备方法包括如下步骤：S1、将石墨烯分散于水中形成均匀的分散液A；S2、向分散液A中加入一定量的支链聚乙烯亚胺形成均匀的混合液B；S3、将膨润土分散到水中形成分散液C；S4、将B和C混合并在室温下震荡充分混合,在此过程中石墨烯和膨润土形成自组装纳米复合材料。本申请中将氧化石墨与支链聚乙烯亚胺首先混合,大大提高了石墨烯的分散性且使石墨烯表面带正点,此外,支链聚以酰亚胺还能提高膨润土层间吸附能力。(The invention provides a nano composite material for paint spraying wastewater treatment, a preparation method and application thereof, and belongs to the technical field of sewage treatment. It solves the problem that the paint spraying wastewater can not be treated by adopting a simple and cheap method. The preparation method of the nano composite material for treating the paint spraying wastewater comprises the following steps: s1, dispersing graphene in water to form a uniform dispersion liquid A; s2, adding a certain amount of branched polyethyleneimine into the dispersion liquid A to form a uniform mixed liquid B; s3, dispersing bentonite into water to form a dispersion liquid C; and S4, mixing the B and the C, and shaking at room temperature to fully mix, wherein the graphene and the bentonite form the self-assembled nano composite material in the process. Graphite oxide and branch chain polyethyleneimine are mixed at first in this application, have improved the dispersibility of graphite alkene greatly and have made graphite alkene surface area positive point, and in addition, the branch chain gathers with imide can also improve bentonite interlaminar adsorption capacity.)

1. A preparation method of a nano composite material for paint spraying wastewater treatment is characterized by comprising the following steps:

s1, dispersing graphene in water to form a uniform dispersion liquid A;

s2, adding a certain amount of branched polyethyleneimine into the dispersion liquid A to form a uniform mixed liquid B;

s3, dispersing bentonite into water to form a dispersion liquid C;

and S4, mixing the B and the C, shaking at room temperature, fully mixing, forming a self-assembly nano composite material by the graphene and the bentonite in the process, and filtering, drying and grinding to obtain the graphene/bentonite nano composite material.

2. The method for preparing a nanocomposite for paint spraying wastewater treatment according to claim 1, wherein the filtering in the step S4 is suction filtration.

3. The method of preparing a nanocomposite for paint waste water treatment according to claim 1 or 2, wherein the mixing in step S1 and step S3 are ultrasonic mixing at 300W and 40KHz frequency.

4. The method of preparing a nanocomposite for paint waste water treatment according to claim 1 or 2, wherein the mixing time in the step S1 is 0 to 2 hours, and the mixing time in the step S4 is 1 to 10 hours.

5. The method for preparing a nanocomposite for paint waste water treatment according to claim 1 or 2, wherein the drying time in the step S4 is 8 to 10 hours.

6. The method for preparing a nanocomposite for paint spraying wastewater treatment according to claim 1, wherein in the step S2, the graphene: the mass ratio of the branched polyethyleneimine is (0.05-5): 10.

7. the method for preparing a nanocomposite for paint spraying wastewater treatment according to claim 6, wherein in the step S4, the graphene: branched polyethyleneimine: the mass ratio of the bentonite is (0.05-5): 10:(10-20).

8. A nanocomposite material for water treatment, characterized in that it is produced by the production method as claimed in claims 1 to 7.

9. Use of a nanocomposite for flocculation precipitation in paint spraying circulation waste water, characterized in that the nanocomposite prepared according to claim 8 is added to paint spraying circulation waste water and the pH of the mixed system is adjusted to 7.

10. The use of a nanocomposite material according to claim 9 for flocculating and precipitating paint spraying circulation wastewater, wherein the mass concentration of the nanocomposite material in the wastewater solution is 0.5-2 g/L.

Technical Field

The invention belongs to the technical field of sewage treatment, and relates to preparation of a ternary nanocomposite applied to paint spraying wastewater treatment.

Background

The paint spraying wastewater is typical high-concentration organic wastewater, which is derived from a water curtain used in a paint spraying chamber of a paint spraying production line, after the circulating water is used for a long time, a large amount of organic pollutants such as toluene, acrylic resin, butyl acetate, ethyl acetate, auxiliaries and the like are dissolved in the water, the color is brownish red and has strong peculiar smell, and the process requirement of the circulating water of the paint spraying line cannot be met, so that the circulating water becomes the wastewater. If the paint spraying wastewater is not properly treated, environmental pollution can be caused, and ecological safety and human health are seriously influenced. Researches find that the paint spraying wastewater has high COD concentration, complex pollutant components, poor biodegradability and high toxicity and becomes a type of industrial wastewater which is difficult to treat. The current common treatment technologies for paint spraying wastewater comprise a coagulation method, a Fenton oxidation method, an electric flocculation method and a biochemical method. The coagulation method can remove suspended matters and has certain decolorizing capacity, but has no obvious effect on the degradation of organic matters. Although the treatment capacity of the deep chemical oxidation method such as Fenton is strong, the medicament consumption is large, and the ferric hydroxide precipitation and separation are difficult. If the paint spraying wastewater is treated by a biochemical method, a preposed acidolysis oxidation process is needed to improve the biodegradability, but the process conditions are not easy to control, and the treatment effect is poor. In conclusion, the treatment of the paint spraying wastewater is still a difficult problem in the treatment of the wastewater, and a new effective technology needs to be developed urgently.

Chinese patent CN 109248658A discloses a preparation method of graphene organically modified bentonite particles, which is applied to the adsorption of humic acid, and the method adopts organic matters to modify bentonite; then adding graphene and organically modified bentonite under microwave for compounding; and finally, adding starch to prepare the graphene organic modified bentonite particles by high-temperature calcination. The preparation process involves the processes of ultrasonic dispersion and high-temperature calcination, needs to add a starch auxiliary agent, and has the disadvantages of complicated preparation method and high energy consumption. In addition, the starch auxiliary agent can be partially carbonized in the calcining process, the starch is easy to dissolve in water, and the composite material is dissolved in the water solution to cause structural damage, so that the method is not favorable for practical use.

Chinese patent CN 107159118A discloses a preparation method of bentonite grafted graphene oxide, which takes epoxy chloropropane as a cross-linking agent and ammonium sulfate and sodium bisulfate as initiators to prepare a bentonite grafted graphene oxide composite material through organic reaction. The method only carries out organic crosslinking on the surface of bentonite, forms chemical bonds with graphene oxide and carries out grafting reaction. Graphene only covers the surface of bentonite, is easy to form accumulation and agglomeration on the surface of the bentonite, and is not beneficial to the adsorption among bentonite layers. The polymerization reaction involved in the method uses organic reagents such as acetone, epichlorohydrin and the like, and the reaction conditions are not easy to control and are not beneficial to practical use.

Therefore, the graphene-bentonite composite material is prepared by a simple and cheap method, and the intercalation and the stripping of the bentonite and the firm compounding of the bentonite and the graphene are realized, so that the problem which is not solved yet is solved, and the application of the graphene-bentonite composite material in water treatment is limited.

Disclosure of Invention

The first purpose of the invention is to solve the problems of the prior art in treating circulating water for paint spraying, and to provide an economical and effective method for preparing a nano composite material.

The first object of the present invention can be achieved by the following technical solutions:

a preparation method of a nano composite material for paint spraying wastewater treatment is characterized by comprising the following steps:

s1, dispersing graphene in water to form a uniform dispersion liquid A;

s2, adding a certain amount of branched polyethyleneimine into the dispersion liquid A to form a uniform mixed liquid B;

s3, dispersing bentonite into water to form a dispersion liquid C;

and S4, mixing the B and the C, shaking at room temperature, fully mixing, forming a self-assembly nano composite material by the graphene and the bentonite in the process, and filtering, drying and grinding to obtain the graphene/bentonite nano composite material.

The polymer of branched chain polyacetyl imine is used as a surfactant for the first time, so that graphene can be effectively dispersed to be provided with a positive point and is easy to compound with bentonite; and the interlayer can be inserted into the bentonite layer to increase the adsorption area.

In the above method for preparing a nanocomposite for paint spraying wastewater treatment, the filtering in the step S4 is suction filtration.

In the above method for preparing a nanocomposite for paint spraying wastewater treatment, the mixing in step S1 and step S3 are ultrasonic mixing, the ultrasonic power is 300W, and the frequency is 40 KHz.

In the above method for preparing a nanocomposite for paint waste water treatment, the mixing time in the step S1 is 0 to 2 hours, and the mixing time in the step S4 is 1 to 10 hours.

In the above method for preparing a nanocomposite for paint waste water treatment, the drying time in the step S4 is 8 to 10 hours.

In the above method for preparing a nanocomposite for paint spraying wastewater treatment, in step S2, the graphene: the mass ratio of the branched polyethyleneimine is (0.05-5): 10.

in the above method for preparing a nanocomposite for paint spraying wastewater treatment, in step S4, the graphene: branched polyethyleneimine: the mass ratio of the bentonite is (0.05-5): 10:(10-20).

The second purpose of the invention is to solve the problems existing in the prior art when the paint spraying circulating water is treated, and provide a nano composite material capable of flocculating and precipitating paint spraying circulating wastewater.

The second object of the present invention can be achieved by the following technical solutions:

the nano composite material for treating the paint spraying wastewater is characterized by being prepared by the preparation method.

The third purpose of the invention is to solve the problems existing in the prior art when treating the circulating water for paint spraying, and to provide an application of the nano composite material to the flocculation and precipitation of the circulating wastewater for paint spraying.

The third object of the present invention can be achieved by the following technical solutions:

the application of the nano composite material in the flocculation and precipitation of the paint spraying circulating wastewater is characterized in that the prepared nano composite material is added into the paint spraying circulating wastewater, and the pH value of a mixed system is adjusted to 7.

In the application of the nano composite material in the flocculation precipitation of the paint spraying circulating wastewater, the mass concentration of the nano composite material in the wastewater solution is 0.5-2 g/L.

In the application of the nano composite material in the flocculation and precipitation of the paint spraying circulating wastewater, the mass concentration of the paint spraying circulating wastewater is 1000-10000 mg/L.

Compared with the prior art, the graphite oxide and the branched polyethyleneimine are firstly mixed in the application, so that the dispersity of the graphene is greatly improved, and the surface of the graphene is provided with the positive points, so that the graphene is combined with the bentonite more firmly. In addition, the branched polyimide can be inserted into the interlayer of bentonite, so that the interlayer adsorption capacity of the bentonite is improved, and functional active functional groups can be grafted on the surface of the bentonite, so that the removal capacity of organic pollutants is improved. The material has the functions of adsorption and flocculation, and greatly enhances the removal effect of organic components in the paint spraying wastewater.

Drawings

FIG. 1 is an SEM photograph of a bentonite nanocomposite obtained in example 1.

FIG. 2 is an XRD pattern of a bentonite nanocomposite obtained in example 1.

FIG. 3 is a Raman plot of the bentonite nanocomposite obtained in example 1.

FIG. 4 is an XPS plot of a bentonite nanocomposite obtained in example 1.

Detailed Description

The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.