Design And Application Of Waste Cotton Derived MoS₂/Carbon Composite

The accelerated urbanization and industrialization have created a worldwide problem of water and air pollution,which has seriously affected people’s health and damaged the environment.According to data,about 4.2 million people died prematurely from PM pollution in 2015,accounting for 7.6%of the global death.In China,about 1.27 million people die each year from diseases caused by PM pollution.At the same time,the exploitation and transportation of offshore oil and the production of industrial oil pollution leading crude oil spills and the discharge of industrial oil pollution into waters,have caused serious water pollution problems.Therefore,it is necessary to develop a sustainable,environmentally friendly,and recyclable absorber to deal with such pollution problems.In this work,waste cotton fibers were used as the raw materials to prepare carbonized cellulose aerogel(CCA),then molybdenum disulfide(MoS2)nanosheets were vertically grown on the aerogel surface by hydrothermal treatment and finally synthesized the Freestanding-MoS2@Carbonized Cellulose Aerogel(F-MoS2@CCA).Due to its porous three-dimensional frame structure and the properties of hydrophobic and lipophilic,its adsorption capacity for organic solutions can reach 32.7 to 72.4 times of its own mass.At the same time,it can quickly adsorb oil pollution in the oil-water mixture to achieve the aim of oil-water separation.What’s more,the material can be regenerated by a simple combustion method and it shows a stable regeneration performance.Moreover,due to the high specific surface area,the excellent electrical conductivity of the carbonized aerogel,and excellent surface charge accumulation ability,the removal efficiency of PM2.5 and PM10 is over 99.91%and 99.95%,respectively.The high efficiency can be maintained for up to 600 min demonstration(PM2.5>98.6%,PM10>99.1%).This composite air filter also exhibited excellent reusability:the adsorption efficiency was greater than 97.80%after 5 cycles,and regeneration can be simply realized by washing.The current work not only provides new strategies for designing more efficient PM filter and oil-water separation absorber but also suggests an avenue to recycle waste cotton fibers.