水热条件下乙二醇对废旧棉纤维碳化的影响

摘要

The waste cotton fiber with ethylene glycol (Eg) is carbonating under hydrothermal conditions.The morphology,physical and chemical structural characteristics of the hydrothermally carbonized products were investigated with scanning electron microscopy(SEM),X-ray diffraction (XRD),X-ray photoelectron spectroscopy (XPS),fourier-transform infrared spectrometer (FTIR),elemental analysis (EA) and thermogravimetric analysis (TG),and other methods.Result shows that the hydrothermal product of waste cotton fiber is made up of irregular particles or sticks which have amorphous carbon structure and containing rich oxygen functional groups on the surface.With the mass fraction of Eg increasing,the hydrothermally carbonized products yield and energy production rate generally presents a trend of rises first and fall later,C content increasing,calorific value increased.But,when Eg content is higher than 72%,the quality of C/O ratio began to decrease,O content increases.Cotton fiber carbonization degree is reduced,less calorific value.Eg does not affect the hydrothermally carbonized products' good thermal stability in the system of the hydrothermal carbonization.%将废旧棉纤维和乙二醇(Eg)在水热条件下进行碳化处理,采用扫描电镜、X射线衍射、X光电子射线能谱、傅里叶红外光谱、元素分析及热重分析等方法研究Eg对废旧棉纤维物化结构特性的影响.结果表明,水热条件下棉纤维碳化产物形貌为具有无定型碳结构的不规则颗粒或棒状,且表面含有丰富的含氧官能团.随着Eg质量分数的增加,水热焦炭产率及能量产率总体呈现先减后增的趋势,C含量逐渐增加,热值增大.但在Eg含量高于72%时,C/O质量比开始减小,O含量增大,棉纤维碳化程度降低,热值随之减小.水热碳化体系中,Eg的存在与否不影响水热焦炭良好的热稳定性能.