Aerogel is a solid material with the smallest density and lightest weight in the world at present. Its unique three?dimensional network structure makes it widely used. Cellulose aerogels not only have the characteristics of high porosity and high specific surface area of aerogels, but also can be degraded by microorganisms and be compatible with other substances, which is a new energy suitable for sustainable development. The preparation process of cellulose aerogel—sol gel process and hydrogel drying process are described. In addition, the applications of cellulose aerogel in oil?water separation, heat insulation, phase change, supercapacitor, biomedicine and other aspects are also introduced, and its development is prospected.

MoS₂ quantum dots (QDs) have attracted a lot of attention lately due to their excellent fluorescence properties, catalytic activity, and good biocompatibility. There are various ways to prepare MoS₂ QDs since its first preparation in 2010, including hydrothermal, ultrasonic, and etching methods. Even though other molybdenum?based quantum dots like MoP, Mo₂C, Mo₂N, and MoSe₂ have shown great potential in various fields, their preparation methods have rarely been reported. In this article, The preparation methods and research status of these molybdenum?based quantum dots (MoO₂/MoO₃, MoP, Mo₂C, Mo₂N amd MoSe₂) and comparing the advantages and limitations of different preparation methods were discussed. The key problems in the synthesis of these quantum dots and their application prospects in different directions were discussed.