果糖基碳微球的制备及其吸附性能研究

Study on Preparation of Fructose-based Carbon Microspheres and Their Adsorption Properties

中文关键词:  果糖  碳微球  水热碳化  软模板法  吸附

Key Words:fructose  carbon microsphere  hydrothermal carbonization  soft template  adsorption

中文摘要:

      以果糖为碳前驱体、聚环氧乙烷-聚环氧丙烷-聚环氧乙烷三嵌段共聚物（Pluronic P123）为模板剂，采用软模板水热碳化法制备果糖碳微球。利用扫描电子显微镜（SEM）、透射电子显微镜（TEM）对其形貌进行表征，探究果糖碳微球最佳制备条件，并对其吸附亚甲基蓝的性能及影响因素进行了研究。结果表明，水热碳化时间为6 h时，果糖碳微球尺寸分布均匀，表面光滑。在最佳吸附条件下，果糖碳微球对亚甲基蓝的吸附量可达91.43 mg/g，经5次吸附循环后其吸附量仍为初始吸附量的76.9%，具有良好的循环使用性能；其吸附过程符合准二级吸附动力学，Langmuir等温吸附模型对其吸附过程的拟合更准确，表明亚甲基蓝以单分子层方式吸附于果糖碳微球表面，亚甲基蓝各分子间无相互作用。

Abstract:

      Fructose-based carbon microspheres were prepared through hydrothermal carbonization using fructose as a carbon precursor and Pluronic P123 as the soft template. The morphology of fructose-based microsphere and optimal preparation conditions were investigated by using scanning electron microscopy （SEM） and transmission electron microscopy （TEM）， and the adsorption performance and affecting factors of fructose-based microspheres on methylene blue （MB） were studied as well. The results showed that the fructose-based microspheres possessed uniform size distribution and smooth surface after hydrothermal carbonization of 6 h. Moreover， the highest adsorption capacity of fructose-based microspheres on MB reached up to 91.43 mg/g under the optimal adsorption conditions， and it maintained 76.9% of its maximum adsorption capacity after 5 cycles of use， indicating excellent reusability. Furthermore， it was confirmed that its adsorption kinetics was fitted with pseudo-second-order， and the adsorption isotherm was more conformed to the Langmuir model， which implied that MB was adsorbed on the surface of fructose-based carbon microspheres in a monomolecular manner and there was no interaction between MB molecules.