Preparation Of Cellulose-based Porous Materials And Their Application In Electrochemistry Properties

Due to its high specific surface area and large pore volume,3D porous materials have attracted broader concerns in application of photocatalysis and electrochemistry.With the increasing attention to environmental pollution,biomass materials which are biodegradable and sustainable replaced petrochemical materials as feedstock to prepare 3D porous materials.In this paper,cellulose and CNC are used as raw materials 3D porous titanium dioxide and silica,3D TiO₂/C composite porous materials,CNC/rGO composites and carbon materials were prepared by template method,composite method and nano support,and the applications of the porous materials include in photocatalysis,lithium ion battery and supercapacitors.?1?Prepared porous TiO₂ and SiO₂ with cellulose aerogels and carbon aerogels as templates.Controlling the temperature and heating rate of the carbonization procedure,the pore structure of the materials could be regulated significantly.At low heating rate,it's possible to gain the porous TiO₂ with specific area of 221 m²·g^-1 and porous SiO₂ with specific area of 451.3 m²·g^-1.In addition,the photocatalytic activity of CCAs750-T was the highest among porous TiO₂ prepared by different methods and 95%of MO could be degraded within 90 min.?2?TiO₂/C composite materials were prepared as template materials by sol-gel method with cellulose aerogels,and various composite materials at different preparation temperatures were investigated as electrode materials for lithium ion batteries.The sample T-800 obtained at 800°C has high electrochemical energy storage properties,the first discharge specific capacitance was 1195 mAh·g^-1,the first specific capacitance was 541 mAh·g^-1,the specific capacity was 421 mAh·g^-1 after 50 cycles,and T-800 has higher electrochemical performance as the electrode material of lithium ion battery.?3?The hydrogels of GO/CNC prepared by mixture of CNC and GO in different proportions at 120°C by hydrothermal method.Replacing water in hydrogels by tert-butyl alcohol and further freeze-drying to obtain composite aerogels with good formability and strength,whose specific surface area is 101.90 m²·g^-1,and press stress is 37.77 kPa.After carbonizd at 800°C in Ar,its specific surface area is 193.57 m²·g^-1.In the three electrode system,its specific capacitance was 51.25 F·g^-1 when the current density was 1A·g^-1.