School of Marine Science and Engineering, Hebei University of Technology, Tianjin 300130, PR China; Engineering Research Center of Seawater Utilization Technology, Ministry of Education, Tianjin 300130, PR China.
School of Marine Science and Engineering, Hebei University of Technology, Tianjin 300130, PR China.
Carbohydr Polym. 2016 Nov 20;153:320-328. doi: 10.1016/j.carbpol.2016.07.072. Epub 2016 Jul 28.
In this work, carbon/SiO2 composites, using amylose and tetraethyl orthosilicate (TEOS) as raw materials, were successfully prepared by a facial hydrothermal carbonization process. The carbon/SiO2 composites were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), Energy Dispersive Spectroscopy (EDS), transmission electron microscope (TEM), N2 adsorption and Thermogravimetric (TG) analysis. The composites, which were made up of amorphous SiO2 and amorphous carbon, were found to have hierarchical porous structures. The mass ratios of amylose and SiO2 and the hydrothermal carbonization time had significant effects on the morphology of the composites, which had three shapes including monodispersed spheres, porous pieces and the nano-fibers combined with nano-spheres structures. The adsorption performance of the composites was studied using Pb(2+) as simulated contaminants from water. When the mass ratio of amylose and SiO2 was 9/1, the hydrothermal time was 30h and the hydrothermal temperature was 180°C, the adsorption capacity of the composites achieved to 52mg/g. Experimental data show that adsorption kinetics of the carbon/SiO2 composites can be fitted well by the Elovich model, while the isothermal data can be perfectly described by the Langmuir adsorption model and Freundlich adsorption model. The maximum adsorption capacity of the carbon/SiO2 composites is 56.18mgg(-1).
在这项工作中，以直链淀粉和正硅酸乙酯（TEOS）为原料，通过简单的水热碳化过程成功制备了碳/SiO2 复合材料。采用 X 射线衍射（XRD）、扫描电子显微镜（SEM）、能谱（EDS）、透射电子显微镜（TEM）、N2 吸附和热重（TG）分析对碳/SiO2 复合材料进行了表征。这些由无定形 SiO2 和无定形碳组成的复合材料具有分级多孔结构。直链淀粉和 SiO2 的质量比以及水热碳化时间对复合材料的形态有显著影响，复合材料具有三种形状，包括单分散球体、多孔片和纳米纤维与纳米球结构的结合。采用 Pb(2+)作为水中模拟污染物研究了复合材料的吸附性能。当直链淀粉和 SiO2 的质量比为 9/1、水热时间为 30h、水热温度为 180°C 时，复合材料的吸附容量达到 52mg/g。实验数据表明，碳/SiO2 复合材料的吸附动力学可以很好地拟合 Elovich 模型，而等温数据可以很好地描述 Langmuir 吸附模型和 Freundlich 吸附模型。碳/SiO2 复合材料的最大吸附容量为 56.18mgg(-1)。
