Research On The Efficient Preparation And Application Of Graphene Oxide-based Aerogel Particles

Aerogels are a kind of highly porous solid materials with low density,large porosity,high absorption capacity,and low thermal conductivity.Graphene oxide(GO),as an important derivative and precursor of graphene,has rich oxygen-containing functional groups,tunable surface characteristics,and good dispersibility.GO-based aerogels possess remarkable properties,and have attracted great research interest over the past decade.However,GO-based aerogels are still facing challenges such as low preparation efficiency,limited practical appliations and inconvenient in use.It is of great importance to develop GO-based aerogels with high preparation efficiency,good performance in applications and high convenient in use.Therefore,this work is foucused on the high efficient preparation and application of GO-based aerogel granules.First,carbon nanotubes(CNT)were non-covalently modified with GO to achieve good dispersibility in water.Spherical GO/CNT aerogel granules(aerogel beads)were prepared by a liquid dripping method.The aerogel beads are controllable in size,with an average density of about 0.04 g/cm~3and a thermal conductivity of about0.093W/m K.The aerogel beads have a porous structure,and can adsorb phase change materials(PCM)such as paraffin(hydrophobic)and calcium chloride(hydrophilic)to form PCM beads.The PCM beads have excellent heat storage properties,and can be casted with a variety of matrix materials.PCM beads and paraffin were casted into composites with high thermal storage capacity and the ability to fast absorb and release heat.PCM beads and cement were casted into thermal storage concrete.It was found that the PCM beads improved the heat transfer rate,heat storage performance and thermal control performance of the concrete significantly.However,the liquid dripping method requires strict control over the preparation conditions and has insufficient convenience.Then,a liquid granulating method was developed to realize the efficient,continuous and controllable preparation of various GO-based aerogel granules.Aerogel granules based on GO and alpha-zirconium phosphate(?-Zr P)were studied in detail.?-Zr P was synthesized by the hydrothermal method.It was intercalated and exfoliated by monoethanolamine and ultrasonic treatment.GO/?-Zr P aerogel granules were prepared by liquid granulating method.The aerogel granules have porous structure with an average density of about 94 mg/cm~3.They has high resistance to chemicals and fire,and can adsorb hazardous chemicals quickly.The absorption capacity reached about 41 times of their own weight,making them promising candidates in the applictions of pollution control,clean-up of hazardous chemical spills and chemical accident disposal.In this paper,the liquid dripping method has been optimized and a liquid granulating method has been invented.Highly efficient and continuous production of GO-based aerogel granules has been realized.Based on the excellent properties of these aergel granules,possible applications such as phase change thermal storage,thermal storage concrete and hazardous chemical absorption have been studied.Overall,it has explored a feasible technical route for the scientific research and practical application of GO-based aerogel granules and nanomaterial aerogels.