Currently, the development of fast-selling fashion has brought more clothing choices to people, and it has also led to a series of environmental problems. According to statistics from the China Circular Economy Association, an average of about 26 million tons of used clothes are discarded every year in my country, with an average of 3 to 5 pieces thrown away per person every year. Among them, more than 90% of used clothing is directly landfilled or incinerated, causing great waste of resources and environmental problems. In addition, the textile industry consumes a lot of water. The water consumption for producing one ton of textiles can reach 200 tons. According to statistics, the water consumption of my country’s textile industry accounts for approximately 6.3% of the country’s total water consumption. The wastewater discharged from the printing, dyeing and finishing of the textile industry accounts for 1/5 of the total global industrial wastewater discharge. Textile industry wastewater discharge has become a focus issue.
In response to the above problems, Professor Li Yi’s research group at the University of Manchester recently announced a functional fabric with high absorbency and enhanced catalytic performance. This research can realize the functional reuse of waste textiles and textile wastewater Highly efficient purification is in line with the green development goals of the textile industry.
First, the researchers used discarded wool fabrics as raw materials and used tie-dyeing technology to coat the surface of the wool fabrics with a layer of titanium dioxide/graphene oxide (TiO2/GO) mixture. It is then reduced with L-AA acid to obtain functional TiO2/rGO fabric (FF-rGO). Judging from the SEM images of FF-rGO functional fabric and the surface element distribution test results, rGO and TiO2 are closely and evenly distributed on the surface of the textile.
As a commonly used cationic dye, methylene blue is a refractory pollutant in printing and dyeing wastewater. Based on this, the researchers explored the absorption and catalytic performance of FF-rGO functional fabrics for methylene blue. The results showed that due to the electrostatic interaction between graphene and organic dye molecules and π-π bond stacking, functional fabrics with a mass fraction of rGO of 15% It has the highest absorption capacity for methylene blue; it also has the highest catalytic efficiency and can degrade 95% of methylene blue within 1 hour.
Based on the super absorption and photocatalytic properties of FF-rGO, the researchers designed a degradation strategy of “absorption first and then catalysis”. The results are shown in After 6 hours of pre-absorption, the functional fabric with an rGO mass fraction of 15% catalytically degraded more than 90% of methylene blue within 15 minutes, which was 26.3% higher than the degradation rate in the pre-absorption stage without use.
In addition, in order to evaluate the practical application of waste fabric reuse and sewage treatment, researchers functionalized waste socks and used them for large-scale sewage treatment. The experiment adopted a continuous degradation process of 12 hours of absorption and 12 hours of photocatalysis (simulating the alternation of night and day in the actual process). After 120 hours of treatment, more than 93% of methylene blue was degraded, proving that this functional textile material and degradation strategy can effectively recycle waste fabrics. Utilization and effectiveness in practical applications in wastewater treatment.
Keywords:
Fast Fashion Waste Textiles Recycling
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