Study On The Extraction,Modification And Application Of Corn Husk Cellulose

Based on the pretreatment of corn husk,the method of extracting corn husk cellulose by ultrasonic assisted alkali hydrogen peroxide method was established.Based on the single factor experiment,the Box-Benhnken center combination experiment was used to optimize,determine the optimum process conditions of extracting corn husk cellulose was:ultrasonic temperature was 70?,ultrasonic time was 70 min,ultrasonic power is 200 W,NaOH mass fraction was 8%,H2O2 volume fraction was 0.7%,the solid/liquid ratio was 1:30 g/mL,Under these conditions,the content of cellulose was 83.34%.The structure of corn husk cellulose was analyzed.FTIR analysis showed that the peaks of hemicellulose and lignin were obviously weakened and had typical cellulose peaks;X-ray diffraction analysis showed that the crystal structure of corn husk cellulose did not change;SEM analysis showed that the surface of corn husk cellulose aggregated and formed a fold structure;Particle size analysis showed that the average particle size was 111.0 ?m;Thermal analysis showed that the maximum thermal decomposition temperature of corn husk cellulose was 328? and had certain thermal stability.The acetylated corn husk cellulose was prepared from corn husk cellulose,on the basis of single factor experiment,the Box-Benhnken center combination experiment was used to optimize,determine the optimum process conditions of preparation of acetylated corn husk cellulose was:the solid/liquid ratio was 1:5 g/mL,reaction temperature was 40?,reaction time was 2.5 h,the dosage of concentrated sulfuric acid was 10%,Under these conditions,the substitution degree was2.92.The structure of acetylated corn husk cellulose was analyzed.FTIR analysis showed that the hydroxyl group of corn husk cellulose was replaced by acetyl group;X-ray diffraction analysis showed that the crystal structure changed after acetylation;SEM analysis showed that the surface of acetylated corn husk cellulose was rough and porous;Particle size analysis showed that the average acetylated particle size was 27.69 ?m;Thermal analysis showed that the highest pyrolysis temperature of acetylated corn husk cellulose was 340? and had better thermal stability.Acetylated corn husk cellulose/polyvinyl alcohol composite membrane was prepared from acetylated corn husk cellulose and polyvinyl alcohol.The structure and properties of the composite membrane were analyzed.FTIR analysis showed that there was no new absorption peak,indicating that there was no chemical reaction between the raw materials;X-ray diffraction analysis showed that the crystal structure of acetylated corn husk cellulose did not change;SEM analysis showed that the surface of the composite film was relatively complete and uniform;Thermal analysis showed that the highest pyrolysis temperature of the composite film was 332? which had certain thermal stability;Mechanical analysis showed that the tensile strength and elongation at break of the composite film decreased with the increase of acetylated corn husk cellulose content;Application performance analysis showed that the composite film had good thermal solubility,light transmittance and degradation performance.Cellulose microspheres were prepared from acetylated corn husk celluloseand the structure and properties of the microspheres were analyzed.SEM analysis showed that the cellulose microspheres were spherical with a large number of micropores on the surface;Particle size analysis showed that the average particle size of the microspheres was 11.673?m;Specific surface area analysis showed that the specific surface area of the microspheres was 26.4210 m2/g,and the average pore size was 24.0302 nm;Application performance analysis showed that the microspheres had good adsorbability to dyes.