Solid Residue After Enzymatic Hydrolysis Of Reed And Lignin Were Used To Prepare 3d Printing Composites

The aim of this paper is to find the effect of NaOH pretreatment of reed and compared with other pretreatment’s effect,namely p-TsOH(p-toluenesulfonic acid)and H2SO4-SE(steam explosion),in order to evaluate the potential of this pretreatment for ethanol production.The physico-chemical properties of reed before and after pretreatments were evaluated by XRD and FT-IR.Pretreatment with NaOH can significantly reduce lignin content and expose more cellulose to the surface.After NaOH solution autoclaving treatment,the glucose concentration and yield after cellulase hydrolysis reached 14.8 g/L and 78.5%,respectively.For improving the economic feasibility of the reed biorefinery process,EPR(enzyme hydrolysis-processing residue),including RES(enzyme hydrolysis-processing residue treated by NaOH),REP(enzyme hydrolysis-processing residue treated by p-TsOH)and RED(enzyme hydrolysis-processing residue treated by H2SO4-SE),were used as the reinforcing phase for 3D printing material.The results indicated that RES-reinforced composites showed balanced advantages in enzymatic hydrolysis efficiency and mechanical properties.The comparison between RPC and 3D-printed wires on the market shows that RPC materials are relatively compact in combination and their mechanical properties are slightly lower than those of pure PLA,which are better than WPC1,WPC2 and WPC3,and have reached the national standard.The composites had a good performance when the proportion of biomass reached 20%.The current work can make full use of reeds in biorefinery processes and make RPC profitable.The alkali-extracted aspen wood lignin was compared with the lignin of the reed,indicating that the properties of aspen wood lignin(AL)were stable.Through mechanical performance contrast between the two,aspen wood lignin composite(ALC)tensile strength and Young’s modulus than a reed lignin composite(RLC)is low,but the differences between bending strength and modulus are small.The impact strength of ALC is 3.9 KJ/m2 smaller than that of RLC.The comparison results of the lignin model compound group/PLA composite materials show that the difference of performance may be caused by the hydrophobic size.Further evaluation of the effect of the cellulose/lignin mixture on the properties of RPC(residue plastic composites)indicated that the mechanical properties improved as the cellulose component increases,especially in terms of modulus.By comparing the type and content of the biological additives on the properties of composites,the optimal formula of the biological additives was obtained:2%maleic anhydride grafted polyethylene(PE-g-MA),PEG600,2%synthetic of plant ester,and glass fiber was added to improve the properties of the composite.