A two-dimensional magnetic mxene for the removal of methylene blue in printing and dyeing wastewater

Abstract

The invention discloses a method for removing methylene blue in printing and dyeing wastewater by two-dimensional magnetic MXene and belongs to the field of printing and dyeing wastewater treatment. The two-dimensional magnetic MXene is prepared by etching a novel ceramic material Ti3AlC2 to obtain MXene and compounding the MXene with magnetic ferroferric oxide. The prepared magnetic composite material Fe3O4@MXene is fed into the printing and dyeing wastewater at normal temperature for adsorbing to remove the methylene blue; after reaction is ended, the concentration of the methylene blue is detected to be nearly zero, and the removal rate is 99 percent. The method disclosed by the invention has the advantages of high removal efficiency, simple reaction conditions, less consumption and nosecondary pollution. According to the method disclosed by the invention, a treatment process is simple; the adopted raw materials are few; a preparation process is easy to operate and is suitable forapplied to actual production on a large scale.

Description

technical field [0001] The invention belongs to the field of printing and dyeing wastewater treatment, in particular to a method for removing methylene blue in printing and dyeing wastewater by using two-dimensional magnetic MXene. Background technique [0002] The printing and dyeing industry is a large discharge of industrial wastewater. According to incomplete statistics, the daily discharge of printing and dyeing wastewater in the country reaches 3×10 6 ~4×10 6 m 3 . Printing and dyeing wastewater has the characteristics of large water volume, large changes in water quality, strong acidity and alkalinity, high content of organic pollutants, difficult biodegradation and high water chroma, and is one of the most difficult industrial wastewater to treat. Methylene blue is a common dye that widely exists in printing and dyeing wastewater. It can cause varying degrees of damage to the eyes and skin of humans and animals. In mild cases, it can cause severe discomfort or all...

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Problems solved by technology

Secondly, the blue methylene blue is easy to interfere with the light transmission of water bodies, reduce the light transmittance of natural water bodies, and seriously affect the photosynthesis of aquatic plants and the metabolism of aquatic animals.

Therefore, if such wastewater is not treated in time, it will pose a serious threat to human and animal health and cause incalculable damage to the ecosystem.

[0003] For printing and dyeing wastewater containing methylene blue, the traditional treatment methods mainly include physical, chemical and biological methods, of which physical methods include electrodialysis and membrane separation, etc., but this method has disadvantages such as high operating costs and complicated subsequent treatment processes; chemical methods such as Coagulation method, oxidation method and precipitation-flocculation method, etc., need to add a large amount of chemicals during the treatment process, which is easy to form new sediments and increase the difficulty of subsequent water treatment; biological methods mainly include anaerobic method and aerobic method, etc., but biological methods The method has high requirements on the quality of sewage water. If it is applied to the treatment of printing and dyeing wastewater, it needs to be combined with physical and chemical methods to pretreat the water body, resulting in cumbersome operations, and the quality and chroma of the effluent water are not easy to meet the standards.

Therefore, the above treatment methods are difficult to meet the discharge requirements of wastewater containing methylene blue

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