Preparation And Properties Of Cellulose Carbon Aerogel Materials

With the increase of non-renewable energy consumption and the increasing problem of water pollution,renewable and clean energy and oil-water separation materials have attracted more and more attention.Among many renewable materials,cellulose is one of the most abundant resources in nature.Cellulose carbon aerogel prepared from cellulose is a good hydrophobic and lipophilic material.In addition,cellulose carbon aerogel has the characteristics of large specific surface area,high porosity,low density,and excellent electrical conductivity,which has attracted widespread attention from many scholars.It has potential application prospects for solving energy shortage and oil-water mixing problems.There are many researches on the preparation and influence of cellulose carbon aerogel-based materials on their morphology and application.However,the research on the application of cellulose carbon aerogel in oil-water separation and electrocatalytic moisture analysis of hydrogen is still limited.Wherefore,In this study,cellulose aerogel was prepared by using cellulose extracted from poplars as a raw material through freeze-drying and other processes.The effect of the added amount of cellulose on the morphology and structure of cellulose aerogel was discussed.Cellulose carbon aerogel was prepared by carbonization process,and the effect of carbonization temperature on the morphology,structure and oil-water separation performance of cellulose carbon aerogel was analyzed;and manganese metal particles were doped by hydrothermal method to prepare manganese doped cellulose carbon aerogel.The effects of manganese metal doping amount on the morphology,structure and electrocatalytic moisture analysis of hydrogen performance of manganese-doped cellulose carbon aerogel were investigated.The main research contents and results are as follows:(1)Preparation and characterization of cellulose aerogels:By studying the influence of the amount of cellulose added on the morphology and structure of the prepared cellulose aerogels,Scanning Electron Microscope,Transmission Electron Microscope,Automatic specific surface area and porosity analyzer,X-ray Diffraction and Fourier Transform Infrared Spectrometer were used for characterized.The results show that as the cellulose concentration increases,the surface morphology of the prepared cellulose aerogels become more compact.When the cellulose concentration increases to 1 wt%,the phenomenon of fiber accumulation occurs.When the cellulose concentration increases to 1 wt%,fiber accumulation occurs.When the cellulose concentration is 0.8 wt%,the specific surface area of cellulose aerogel is the largest at 665.48 m2/g,and the fiber diameter size is mainly concentrated between 0.35-7 nm.As the increasing of cellulose concentration,the total pore volume and average pore diameter of the cellulose aerogel decrease gradually.The results provide a certain theoretical foundation for the subsequent preparation of cellulose carbon aerogel materials.(2)Preparation and characterization of cellulose carbon aerogels:cellulose carbon aerogels were prepared by carbonizing the cellulose aerogels,the effects of carbonization temperature on the morphology and oil-water separation performance of cellulose carbon aerogels were discussed.And the morphology,structure,specific surface area and porosity,water-oil contact angle and oil-water separation performance of cellulose carbon aerogel were tested.The morphology,structure,specific surface area and porosity,water and oil contact angle,and oil-water separation performance of cellulose carbon aerogel were tested.The results show that as the carbonization temperature increases,surface changes of cellulose carbon aerogels increase,and wrinkles appear.This morphology is a good contribution to oil-water separation,well when the temperature is too high,morphological damage became severe.When the carbonization temperature is 900℃,the specific surface area is the largest,which can reach 238.21 m2/g,and it can absorb the largest amount of oil,which is 30 times its own weight.The cellulose carbon aerogel has a water contact angle of more than 130°,and the cellulose carbon aerogel can repeatedly separate oil and water mixture,indicating that it has hydrophobic properties and reusable properties.The research results provide a certain technical support for the application of cellulose carbon aerogel in oil-water separation.(3)Preparation and characterization of manganese-doped cellulose carbon aerogels:by applying manganese metal doped cellulose carbon aerogels,and its application in electrocatalytic moisture analysis of hydrogen was studied.The effects of manganese metal doping amount on the morphology,structure,specific surface area and pore size distribution and the performance of electrocatalytic moisture analysis of hydrogen of manganese-doped cellulose carbon aerogels were investigated.The results show that when the manganese metal doping amount is 7 wt%,the specific surface area of the manganese-doped cellulose carbon aerogel is large,reaching to a value of 15.08 m2/g.The electrocatalytic moisture analysis of hydrogen test showed that the effect of electrocatalytic moisture analysis of hydrogen is the best when the manganese doping content is 7 wt%.It has an overpotential of 50 mV at a current density of 115 mA/cm2.After a 10-hour timed potential test,the voltage drop is only 10%.This provides a certain theoretical basis for the preparation of manganese-doped cellulose carbon aerogel and its application in the electrocatalytic moisture analysis of hydrogen.In summary,the results show that the prepared cellulose aerogel has good structure and morphology,specific surface area and porosity.The cellulose carbon aerogel obtained by carbonizing the cellulose aerogel has the characteristics of lipophilicity and hydrophobicity,and can be applied to oil-water separation.The manganese-doped cellulose carbon aerogel prepared by doping cellulose carbon aerogel with manganese metal has the property of electrocatalytic moisture analysis of hydrogen,and expands its application in the field of electrochemistry.The research results provide a theoretical basis for the preparation of cellulose-carbon aerogels and cellulose-carbon aerogel composites,and it has certain significance for expanding the application field of cellulose carbon aerogel-based composites.