Study On Preparation And Properties Of Regenerated Cellulose Composite Aerogels

With the popularity of water-based ink in the printing and packaging industry,a large number of organic dyes are discharged in the water,which have strong harm to the environment and human health.However,dye waste water is more difficult to treat due to the complex chemical composition,therefore,the removal of toxic dyes in waste water is an extremely urgent issue.Although cellulose(CE),an nature polymer,and its derivant have been applied in the field of organic dye adsorption due to their unique structure and inherent characteristic,their capacity for adsorption of these toxic compounds is often limited.Therefore,in order to solve the above problems,to improve the property of pure CE aerogel,the polyvinyl alcohol(PVA)and graphene oxide(GO)were introduced respectively into the CE aerogel matrix as the filler and the effect of adsorption property of the composite aerogels were studied.Specific contents are as follows:Hybrid aerogels consisting of CE and were prepared via a solution mixing-regeneration-freeze drying process.Compared with regenerated cellulose(RCE)aerogel,the results of XRD showed that the CE solution and PVA solution were evenly dispersed after mixing,FTIR results showed a strong interaction between CE molecules and PVA molecules.The results of SEM showed that CE and PVA molecules could form a more complete porous network structure,and the surface area increases,which contributes to the improvement of the adsorption performance compared with RCE aerogel.There are certain limitations of PVA material on the improvement of CE performance.Most carbon materials have highly effective adsorption performance such as GO,therefore RCE/GO composite aerogels were also prepared via a solution mixing-regeneration-freeze drying process use GO as filler.The presence of GO affected the micromorphology of the hybrid aerogels,and a strong hydrogen bonding interaction was observed after the incorporation of GO.Compared with RCE aerogel,RCE/GO composite aerogel exhibits excellent adsorption properties of electropositive methylene blue(MB)dye,including effects of initial concentration of dye(C0),adsorbent dosage,stirring rate,solution pH on the adsorption of MB.The rapid MB adsorption was driven by electrostatic interactions and followed a pseudo-second-order adsorption kinetic and monolayer Langmuir adsorption isotherm.With the incorporation of only 0.5 wt%GO,the MB adsorption rate of RCE/GO composite aerogel was 88%,which was 340%higher than that of pure RCE aerogel under static adsorption,and this was enhanced to 99%under mechanical oscillation.In addition,the RCE/GO composite aerogel displays outstanding reusability in the adorption of MB and excellent thermal stability.This investigation provides a significant guidance for the development of green environmental adsorbents and improves the removal of organic dye from sewage water.