Fabrication Of Superhydrophobic Polyester Fabric Surface And Study On The Removal Of Insoluble Oil Stains And Soluble Dyes

The discharge of oily sewage and dyeing wastewater seriously threatens human health and ecosystem security.It is especially important to remove insoluble oil pollutants and soluble dyes in wastewater.In recent years,the development of special wetting materials with opposite adhesion to oil and water has become a research hotspot.However,most of the oil-water separation materials with selective wettability involve the use of fluorine compounds in the preparation process,and the preparation process is very complicated.In addition,defects such as material stability are not meeting the requirements of practical applications and limit its large-scale development and utilization.More and more attention is paid to photocatalysis technology in the field of organic dye removal.Although the powder photocatalyst with visible light response has advatages of high light energy utilization rate,high specific surface area and excellent mass and heat transfer performance,it is easy to aggregate and hard to recycle leading to secondary pollution.Besides,the powder photocatalyst is easily adhered by the sediment particles and biofilm in the wastewater,which reduces its photocatalytic performance.Currently,the development of immobilized photocatalytic films has become one of the most promising methods in this field.In this paper,the wettability of fabric surface is changed to hydrophobic and lipophilic for selectively separate oil-water mixture by a simple hydrothermal method.And,Provide photocatalytic properties to the surface of fabrics and apply it to degrade soluble organic dyes in water.The superhydrophobic fabric surfaces with photocatalytic activity have been demonstrated as anti-bioadhesion and anti-particulate depositionit for weakening its effect on photocatalytic performance to a certain extent.The main research details of the full text are are as follows:1)Super-hydrophobic and super-lipophilic fabric is prepared by hydrothermal method combined with simple drying process to achieve modification of polydimethylsiloxane and wax on the surface of the fabric.The as prepared textiles exhibit satisfactory stability and the fabric surface contact angle was maintained at 143.0°after 800 times sandpaper wear cycle experiments.In addition,the fabric can recover its super liquid-repellent property after drying at room temperature even after immersing in water for a week,the WCA can be restored to 150.0°.And the surface contact angle of the fabric is still kept at 142.3° after soaking in an acid-base solution for a period of time,showing good chemical resistance.The prepared fabric also shows good self-cleaning performance.When it is applied to oil-water separation,its separation efficiency can obtain more than 95%.Taking the peanut oil / water mixture as an example,the separation efficiency remained above 90% after five cycles of experiments,showing excellent cyclic stability.2)By adding a photocatalyst bismuth tungstate to the surface modification solution,a hydrothermal method combined with a simple drying and curing method was used to successfully attach a hydrophobic material and a photocatalyst to the surface of the fabric fiber to obtain a photocatalytic super-hydrophobic polyester fabric.On the one hand,it successfully solves the defects that the photocatalyst powder is difficult to recycle in the application process and easily causes secondary pollution;On the other hand,the self-cleaning performance of the superhydrophobic surface makes the photocatalyst attached to the surface of the fabric difficult to be adhered by particles,thereby reducing its impact on photocatalytic efficiency.The water contact angle on the photocatalytic superhydrophobic fabric surface finally reached 164.0°,and the degradation of methylene blue under visible light can be achieved within 2 hours.After five cycles of experiments,the degradation efficiency of the fabric to methylene blue remained above 95%.Moreover,the surface contact angle of the fabric was slightly reduced after the degradation of methylene blue,and it still maintained good hydrophobic properties.