苹果渣氧化纤维素的制备及表征

摘要

In the heterogeneous system,the apple pomace oxidized cellulose was prepared with sodium periodate.The aldehyde content and sample retention rate were used as evaluation standard,and the preparation process was optimized by single factor and orthogonal test.The optimized oxidation process of apple pomace cellulose indicated that the solid-liquid ratio was 1∶25 (g∶ mL),the concentration of sodium periodate was 0.6 mol/L,reaction for 4h,at 45 ℃.Under the above conditions,the content of aldehyde group reached to the highest of 6.02 mmol/g,and the sample retention rate was 81.33％.The results of FTIR,XRD and WHC showed that the oxidized cellulose had the characteristic spectrums of aldehyde group,the crystallinity decreased significantly,the water holding capacity increased,which lay the theoretical foundation for its wide application.%在非均相体系中,以高碘酸钠为氧化剂制备苹果渣氧化纤维素.以醛基含量及样品保留率为评价标准,通过单因素、正交试验优化其制备工艺并表征.结果表明,苹果渣纤维素最优氧化工艺为:料液比1∶25(g∶ mL),高碘酸钠浓度0.6 mol/L,时间4h,温度45℃;此时氧化纤维素醛基含量达到最高值为6.02 mmol/g,样品保留率81.33％.红外光谱、X-射线衍射及持水力测定结果表明,氧化纤维素具有醛基的特征谱峰,结晶度明显下降,持水力增加,这为其今后更广泛应用奠定了理论基础.