壳聚糖/酵母菌复合炭微球的制备及吸附性能研究

Preparation and adsorption of chitosan/yeast carbon composite microspheres

以壳聚糖包裹酵母菌(CWY)为前驱体,在氮气保护条件下,400℃炭化制备出了石榴结构型多孔炭微球。利用扫描电镜、X射线衍射和红外光谱分别对CWY炭微球的形貌和物化结构进行了表征,测试了CWY炭微球的极性,并采用Boehm滴定法对其表面酸性基团进行了分析。结果表明:生成的酵母炭颗粒均匀镶嵌在CWY炭微球内,CWY炭微球在非极性溶液中表现出更好的分散性能,且其表面酸性基团总量为3.281mmol/g。考察了CWY炭微球对强力霉素废水的吸附处理能力,在碱性条件下,CWY炭微球对强力霉素废水(10mg/L)的吸附符合Langmiur模型,50℃时最大吸附量为3.07mg/g。

A novel porous carbon microspheres with pomegranate-like internal structure was synthesized by using chitosan wrapping yeasts（CWY）as precursor via thermal cracking under 400℃.The resultant CWY carbon composite microspheres were characterized by scanning electron microscope（SEM）,X-ray diffraction（XRD）and fourier transform infrared spectroscopy（FT-IR）,respectively.The polarity of microspheres was explored.Boehm titration was involved to determine the contents of acidic groups on the surface of microspheres.The results showed the uniform distribution of internal yeasts carbon.Polarity test showed that the microspheres had a higher dispersion capacity in non-polar dissolvent.The contents of surface acidic groups on the microspheres were 3.281mmol/g.The adsorption capacity of microspheres was evaluated through doxycycline was used as an adsorbate under alkaline condition（pH=10）.The equilibrium data of microspheres fitted well with the langmuir isothermal model,and the maximum theoretical adsorption capacity of microspheres for doxycycline was 3.07mg/g at 50℃.