Preparation And Properties Of Sugarcane Bagasse Cellulose Biofilm Carrier

Sugarcane bagasse cellulose is high yields and abundant resources, it has many advantageous properties, such as sustainable, renewable, biodegradable and environmentally friendly. Because of the cellulose molecular chain has polar hydroxyl groups, the modification of the physical, chemical and composite methods can be used to make the cellulose functional. In this study, SBC biofilm carrier was prepared by using ZnCl2 solution as solvent and bagasse cellulose as raw material through physical method and chemical method. This carrier has strong mechanics performance, high specific surface area and porosity. At present, a lot of study on the application of SBC has been made at home and abroad. But, there is little research of ZnCl2 process for preparation of SBC biofilm carrier on paper.the dissolution and structure change of Sugarcane bagasse cellulose(SBC) in zinc chloride solution was studied. Based on orthogonal experiment, the best dissolving process took place at 85℃ to dissolve 2% SBC in 85% zinc chloride for 210 min. The dissolution process of bagasse cellulose was observed under a microscope. Additionally, the SBC was characterized by FT-IR, TGA, XRD and SEM. It was shown that the zinc chloride was a direct solvent for SBC. After regeneration of cellulose in zinc chloride, the crystallinity of cellulose was decreased greatly, from 65.89% to 43.62%, its crystalline form was transformed from cellulose I to celloluse II, its thermal decomposition temperature was reduced, its thermal stability was slightly decreased, and its internal structure was disrupted.The influence of SBC mass fraction, Na2SO4 content and absorbent cotton content on mechanics performance, porosity, hygroscopicity and specific surface area of Sugarcane bagasse cellulose biofilm carrier were investigated. The results show the best process is SBC mass fraction is 5%, Na2SO4 content is 25% and absorbent cotton content is 10%. The mechanics performance, porosity, and specific surface area can reach 2.78 Mpa、75%、6.68 m2/g respectively.The SBC biofilm carrier’s degradation speed was controlled by crosslink with EGDE, and the effects of different crosslinking degree of bagasse cellulose biofilm carrier in cellulase solution and the actual campus lake water degradation, in order to achieve controllable degradation of the carrier.