The textile industry is still one of the largest and most vibrant industries in the world . The consumption of textile products has increased tremendously from 78 million tons to more than 103 million tons during the last decade. Due to population and economic development, this trend is expected to continue [2, 3]. The average consumption of textiles per person has increased from 7 kg in 1992 to 13 kg in 2013. According to one forecast, about 148 million tons of waste textiles will be produced in 2030, and more than 150 million tons of waste clothing will be incinerated or landfilled in 2050 . The main components of textile wastes are polyester and cotton, which mainly include three categories, namely clothing, household materials, and industrial textiles and are mainly prepared by polyester and cotton [5–8]. Due to space constraints and leachate issues, the landfill method is banned in many regions and countries [9–11]. Such as European Union (EU) legislation has forbidden the landfill disposal of organic materials, including textile wastes, since 2016. Additionally, the member states of EU will be required to set up a separate collection for discarded textiles by 2025. Incineration can reduce the amount of textile wastes in a short period of time, while the combustion process of synthetic textiles will produce toxic chemicals (such as benzene derivatives and polycyclic aromatic hydrocarbons (PAHs)) and emit a large amount of greenhouse gas carbon dioxide[12, 13].
Therefore, an environmentally benign disposal process to upcycle and recycle the textile wastes is necessarily required to alleviate potential health, fossil energy and environmental issues. Textile waste materials have applications in the production of ethanol , glucose, nanocellulose and cellulose nanocrystals, microcrystalline cellulose , biogas , thermal and sound insulation materials , concrete and bricks , and polymer composites , and so forth. The traditional treatment method has complicated procedures or low economic value. In order to change the situation, there is an urgent need for more products with high economic value, such as aerogels, to enhance the financial incentive for textile waste recycling.
Aerogel, as a new material composed of solid framework structure and two different phases of gaseous medium, has the characteristics of typical nano-porous network structure, high specific surface area, high porosity, low density, excellent thermal insulation, outstanding acoustic insulation properties, low dielectric constant, high adsorption and so on. Moreover, due to the size effect, surface effect and macroscopic quantum hazard effect caused by the nanoscale of the skeleton and pores, they have been widely used in many fields such as mechanics, thermal science and optics 
The application prospect for aerogel is broad. With the rapidly developing new energy automobile industry around the world, the global market for automotive sound insulation and heat insulation materials is expected to reach 3.2 billion USD by 2022 . Thermal insulation energy-saving buildings have become a new trend. In addition, the market for absorbents used to absorb spilled oil is expected to reach 177.63 billion USD by 2025 . Driven by the environmental issues and potential market application, we successfully developed aerogels from textile wastes with a facile and cost-effective method. The hydrophobicity, absorption capacity and thermal conductivity of textile waste aerogels have been comprehensively studied for the application of oil spill cleaning and heat insulation.