Effect of Solution pH on the Carbon Microsphere Synthesized by Hydrothermal Carbonization
Effect of Solution pH on the Carbon Microsphere Synthesized by Hydrothermal Carbonization
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DOI：
10.1016/j.proenv.2011.12.198
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发表时间：
2011
期刊：
影响因子：
--
通讯作者：
Jilei Liang;Yihong Liu;Junbo Zhang
中科院分区：
文献类型：
--
作者：
Jilei Liang;Yihong Liu;Junbo Zhang
以淀粉为原料，在不同的溶液pH值条件下，采用水热碳化法制备了直径为10孔米的碳微球。用扫描电子显微镜、氮气吸附等温线和红外光谱对炭化前后的CMSS的结构和表面化学性质进行了表征和比较。结果表明，水热碳化的适宜溶液pH值范围为3~7，起始pH值为1只促进了反应初期淀粉的水解和微球的形成。碳微球表面的化学基团决定了其在醋酸上的吸附，而600℃炭化2小时后，其孔结构起到了吸附的作用。
Carbon microspheres(CMSs) in a diameter of 10colonm were prepared by the hydrothermal carbonization of starch under different solution pH value. The structures and surface chemical properties of obtained CMSs before and after carbonization were characterized and compared by SEM images, nitrogen adsorption isotherms and FT-IR spectra. The results showed that the suitable solution pH value of hydrothermal carbonization ranged from 3 to 7, whereas starting pH of 1 only accelerated the hydrolysis of starch and the formation of microsphere in the early stage of the reaction. The surface chemical groups of the carbon microsphere determined its adsorption on acetic acid, while the porous structure took the role on adsorption after carbonization at 600 °C for 2 h.