With the concept of sustainable development gradually becoming a global consensus,the exploitation of ‘environmental friendliness’and ‘sustainable development’biological renewable resources has been increasingly concerned. The biomass aerogel made from natural biomass material is a new kind of green and environment-friendly porous material. They have excellent properties which are not inferior to that of traditional aerogels,such as high compressive strength,high elasticity,low apparent density,high porosity and high specific surface area. More importantly,they also have the unique advantages of wide source of raw materials,green,non-toxicity,good biocompatibility and biodegradability, which have attracted wide attention from the fields of energy,environment,electronics and biomedicine. However,due to the presence of hydrophilic groups (such as hydroxyl and carboxyl groups)on the surface of most biomass materials,the biomass aerogels are prone to have water absorption during practical use,resulting in the collapse of aerogel structure and the weakening of mechanical properties,and this can greatly reduce their industrial application performance. Therefore,in recent years,researchers have been trying to conduct proper hydrophobic treatments of biomass aerogels,as well as making detailed and in-depth research on the mechanisms of hydrophobicity modifications,and have achieved fruitful results. At present,the hydrophobic modification methods of aerogels include in-situ method,vapor deposition,surface post-treatment and cold plasma technology. The introduction of these hydrophobic modification methods can not only ensure that the biomass aerogels have the advantages of green environmental protection,but also significantly improve their moisture resistance and application stability,and further expand their application. In this paper,the preparation methods of several common biomass aerogels and their research progress in hydrophobicity modification are systematically reviewed from the perspectives of different compositions and sources,and their applications prospect in the fields of adsorption,heat insulation,drug carrier,photocatalysis,biosensor and electrical fields are also presented,so as to provide innovative ideas for the preparation of new biomass aerogels with good application stability and environmental friendliness. © 2022 Cailiao Daobaoshe/ Materials Review. All rights reserved.
