一步法制备糖蜜基活性炭及其界面吸附行为

One-step Synthesis of Activated Carbon from Molasses and Its Interfacial Adsorption Behavior

以糖厂废弃的糖蜜为原料,Na_2CO_3为活化剂,采用一步直接化学活化法制备了糖蜜基活性炭(AC).采用X射线衍射(XRD)、扫描电子显微镜(SEM)、N_2吸附-脱附及元素分析手段对产物进行了表征,证实其为多孔的石墨化碳材料,比表面积高达1023 m^2/g.研究了糖蜜基活性炭对溶液中的重金属离子Pb(Ⅱ)的脱除性能,结果表明:糖蜜基活性炭的吸附容量高于市售活性炭(CC),且所需吸附时间和投炭量均低于市售活性炭;其吸附动力学符合准二级动力学的Langmuir吸附,为单分子层的化学吸附;吸附Pb(Ⅱ)的糖蜜基活性炭可循环再生和重复使用.

The molasses-based activated carbon（AC） was prepared with Na_2CO_3 as activator by one-step chemical activation method.With the characterization of X-ray diffraction（XRD）,scanning electron microscopy（SEM）,N_2 adsorption-desorption analysis and elemental analysis,the results showed that the activated carbon is graphitized carbon with specific surface area of 1023 m^2/g.The removal capacity of molasses-based activated carbon on Pb（Ⅱ） in solution was studied,the results showed that the adsorption capacity of molassesbased activated carbon was higher than that of commercial activated carbon（CC）.With the molasses-based activated carbon as adsorbent,the adsorption time was shorter and the mass of activated carbon were lower than those with commercial activated carbon as adsorbent.The adsorption kinetic fitted better to pesudosecond-order Langumir model,demonstrating a chemical adsorption of monolayer.The molasses-based activated carbon can be recycled and reused for Pb（Ⅱ） adsorption.