Hydrothermal synthesis, characterization, and KOH activation of carbon spheres from glucose
Hydrothermal synthesis, characterization, and KOH activation of carbon spheres from glucose
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DOI：
10.1016/j.carres.2011.03.020
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发表时间：
2011-06-01
影响因子：
3.1
通讯作者：
Liu, Shouxin
中科院分区：
文献类型：
--
作者：
Li, Min;Li, Wei;Liu, Shouxin
采用葡萄糖水热法制备了尺寸可控、富含含氧基团的碳球。考察了葡萄糖浓度、反应温度、反应时间和二次水热处理等水热条件对产物的影响。然后使用KOH活化所获得的CS用于最终制备多孔碳球。扫描电子显微镜用于表征CS的形态和尺寸。采用傅里叶变换红外光谱和X射线光电子能谱对表面官能团进行了分析。用N-2吸附-脱附等温线分析了CS的孔结构。结果表明，通过调节实验参数，可以控制CSs的形貌和粒径分布。180 - 190 ℃的水热温度在4-5小时内适合于CS形成。在这些条件下，CS的大小随葡萄糖浓度的增加而增加。使用在190 ℃下水热处理4 h的0.3 mol/L葡萄糖溶液，可以获得具有良好形貌和大量含氧官能团（主要是-OH和C=0）的单分散CS。所得到的CS尺寸为直径约350 nm。第二次水热处理后，CSs的尺寸增长近250 nm，而不破坏其形态或扩大其尺寸分布。然后通过KOH活化可以获得具有完美球形形状和充分发展的结构的多孔CS（S-BET = 1282.8 m（2）/g，V-micro = 0.44 cm（3）/g）。皇冠版权所有（C）2011由爱思唯尔有限公司出版。保留所有权利。
Carbon spheres (CSs) with controllable sizes and rich in oxygen-containing groups were fabricated using a simple hydrothermal treatment of glucose. The effects of the hydrothermal parameters, including the concentration of glucose, reaction temperature, duration, and the second hydrothermal treatment were investigated. The obtained CSs were then activated using KOH for the eventual preparation of porous carbon spheres. A scanning electron microscope was used to characterize the morphology and size of the CSs. Fourier-transform infrared spectroscopy and X-ray photoelectron spectroscopy were used to analyze the functional surface groups. N-2 adsorption-desorption isotherms were used to analyze the porous structure of the CS. The results revealed that the morphologies and size distribution of the CSs can be controlled by adjusting the experimental parameters. A hydrothermal temperature between 180 and 190 degrees C over 4-5 h was suitable for CS formation. Under these conditions, the size of the CS increased with the concentration of glucose. Mono-dispersed CSs with good morphologies and large numbers of oxygen-containing functional groups (primarily -OH and C=0) can be obtained using a 0.3 mol/L glucose solution that is hydrothermally treated at 190 degrees C for 4 h. The resulting CSs sizes were about 350 nm in diameter. After a second hydrothermal treatment, the sizes of CSs grew nearly 250 nm without damage to its morphology or broadening of their size distribution. Porous CSs with perfectly spherical shapes and fully developed structures (S-BET = 1282.8 m(2)/g, V-micro = 0.44 cm(3)/g) could then be obtained via KOH activation. Crown Copyright (C) 2011 Published by Elsevier Ltd. All rights reserved.