Preparation Of Cellulose Composite Materials With MOF For Application In Water Treatment

Cellulose-based composite materials are one of the focuses of the current development trend of environmentally friendly composite materials.In recent years,cellulose has attracted much attention because of its excellent mechanical properties,low density,biodegradability,and wide availability.They can also be used as fillers or substrates in biocomposites.Metal-organic framework（MOF）have attracted wide attention due to their advantages such as large specific surface area,high porosity,adjustable pore size,good thermal stability,and abundant pollutant adsorption sites.Thus,the application of MOF in water treatment has great prospects.Therefore,this paper chose cellulose and MOF to prepare composite materials,and studied their performance in dye adsorption and uranium removal in water.The main research results of this paper are as follows:1.The cellulose membrane composited with ZIF-8（ZIF-8@CM）was prepared by in-situ synthesis in alkali/urea system.A cellulose-Zn（II）solution is first formed by adding Zn（NO₃）₂ to the dissolved cellulose solution（CS）,then a cellulose-Zn（II）membrane was obtained after regeneration.After removing the alkali,ZIF-8 crystals can in-situ grow into the cellulose membrane matrix by immersing in2-methylimidazole solution.The fabricated ZIF-8@CM has a good separation performance towards rhodamine B（Rh B）with good selectivity and well recyclability.The effects of MOF content and membrane thickness on the separation performance were investigated.Furthermore,the probable separation mechanism has been discussed.2.The ZIF-8@BS composite aerogel was prepared by compounding balsa wood with MOF by in situ growth.After removing lignin and hemicellulose with Na OH/Na₂SO₃,a lignocellulose aerogel（BS）was obtained.Subsequently,zinc ions were introduced to obtain Zn-BS,which was immersed in dimethylimidazole solution to obtain ZIF-8@BS composite aerogel.The obtained ZIF-8@BS composite aerogel has a good adsorption effect on U（Ⅵ）.