Self-cleaning Property Of ZnO/Cotton Nanocomposites Synthesized By Ultrasonic-Microwave Synergistic Method

Withthedevelopmentoftechnologyandsociety,the requirements for textiles in daily life are getting higher and higher,from a single comfort to the multi-functionality,such as safety,health and self-cleaning.Generally speaking,self-cleaning fabrics can remove organic contaminantseffectively such as coffee and wine,however,they have been considered the most suitable place for growth of fungi and bacteria owing totheir large quantity of microporous structure,so it's significant and meaningful to develop self-cleaning fabrics with both photocatalytic degradation and antibacterial activities.ZnO/cotton composites has arouse much attention and became ahot research topic in recent years for their excellent antibacterial effect and photocatalytic performance.There are diverse methods to prepared ZnO/cotton composites,in which sonochemical methodhas become one of the most potential large-scale technology for its simple,efficient,time savingand green process.Based on this,a serial ofZnO/cotton compositeswere prepared by ultrasonic-microwave synergistic method for the first time.Their antibacterial activity and stability againstGram-positive bacteria and Gram-negative bacteria were determined,and theirphotocatalytic self-cleaning properties and cycle performance of the organic dye rhodamine B under visible light were also studied.The main research works were summarized as follows:1.ZnO/cotton composites were prepared by ultrasonic-microwave synergisticmethod.Compared with single microwave irradiation or ultrasonic irradiation,the antibacterial activity and stabilityagainstStaphylococcus aureus and Escherichia coli of the composite prepared by ultrasonic-microwave synergisticmethod is the best.The reaction parameters were regulated by the concentration of zinc acetate and reaction time,and the optimum preparation conditions was: the concentration of Zn2+ was 2 mM,and reaction time was 15 min.Under this condition,the synthesized ZnO/cotton composite showed the best antimicrobial activity towards S.aureus and E.coli.2.ZnO/BiOBr/cotton composites were prepared by ultrasonic-microwave synergisticmethod,its antibacterial activity against S.aureus and P.aeruginosahas improved significantly compared to BiOBr/cotton composites and its photocatalytic degradation of RhBhas improved significantlycompared to ZnO/cotton composites.The optimalamountof zinc acetate was determine to be 1 mmol,and ZnO/BiOBr/cotton composites synthesized in the condition exhibited the best antibacterial activity against S.aureus.At the same time,the composites not only showed excellent bacterial anti-adhesion against S.aureus and P.aeruginosa,but also revealed good photocatalytic self-cleaning property and cycle performance fordegradationof RhB.3.AgBr/ZnO/BiOBr/cotton composites were prepared by ultrasonic-microwave synergisticmethod.Compared with ZnO/BiOBr/cotton,BiOBr/cotton and ZnO/cotton composites,its antibacterial activity against S.aureus and P.aeruginosaas well as photocatalytic degradation of RhB have improved significantly.The optimalamount of silver nitrate was determine to be 1 mmol,and AgBr/ZnO/BiOBr/cotton composites synthesized in the condition exhibited the bestantibacterial activity against S.aureusand P.aeruginosa.Meanwhile,it revealedexcellent photocatalytic self-cleaning property and cycle performance for degradationof RhB.