棉秆皮纤维素/氧化石墨烯纤维的制备及其力学性能和吸附性能

为提高纤维素基纤维的强力及其对阳离子染料亚甲基蓝的吸附能力,利用超声分散和湿法纺丝法,制备了含有不同质量分数氧化石墨烯(GO)的棉秆皮纤维素/GO纤维。借助透射电子显微镜、扫描电子显微镜、傅里叶红外光谱仪分析了棉秆皮纤维素/GO纤维的形态和结构,探讨了GO质量分数对纤维断裂强力和吸附量的影响,并对吸附实验数据进行拟合分析。结果表明:随着GO质量分数的增加,纤维的断裂强力先增大后减小;GO质量分数为0.4%时,纤维断裂强力最优为31.12 cN,与未添加GO的纤维相比断裂强力提高了84%;纤维对亚甲基蓝的吸附量随着GO质量分数的增加而增加,吸附过程符合准二级吸附动力学模型和Langmuir等温吸附模型,属于单分子层的吸附,吸附过程为自发的放热反应。

Preparation of cotton stalk bast cellulose/graphene oxide fiber and its mechanical properties and adsorption capacity

In order to improve the adsorption capacity of cellulose-based adsorbent fibers for cationic methylene blue dyes and the fiber strength,cotton stalk cellulose/graphene oxide(GO)fibers containing different mass fractions of GO were prepared by ultrasonic dispersion method and wet spinning method.The morphology and structure of the materials were analyzed by transmission electron microscopy,scanning electron microscopy and Fourier transform infrared spectroscopy.The effects of GO content on the breaking strength and adsorption capacity of the fibers were discussed.Fitting analysis was conducted on the experimental data of adsorption capacity.The results show that the breaking strength of the fiber increases first and then decreases with the increase of mass fraction of GO.When the mass fraction of GO was 0.4%,the fiber breaking strength peaked at 31.12 cN,which is 84%stronger than that without adding GO.The amount of methylene blue adsorption increases with the increase of GO mass fraction.The adsorption process conforms to the pseudo-second-order adsorption kinetic models and Langmuir isotherms adsorption model.The adsorption is related monolayer molecules,and the adsorption process is a spontaneous exothermic reaction.