Michailof Chrysoula, Stavropoulos George G, Panayiotou Costas
Department of Chemical Engineering, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece.
Bioresour Technol. 2008 Sep;99(14):6400-8. doi: 10.1016/j.biortech.2007.11.057. Epub 2008 Feb 21.
Olive husk was used for the preparation of activated carbon by chemical activation with KOH. The effects of carbonization and activation time on carbon properties were evaluated. The surface area of the produced carbons was measured by means of N(2) adsorption at 77K. The carbons with the highest surface area were further characterized by means of elemental analysis, particle size measurement, Boehm titration, zeta potential measurement, and temperature programmed desorption (TPD). Subsequently they were used for adsorption of a mixture of polyphenols consisting of caffeic acid, vanillin, vanillic acid, pi-hydroxybenzoic acid and gallic acid at two temperatures, and their adsorptive capacity was compared to a commercial carbon Acticarbon CX and found to be higher enough. The role of the porosity and surface groups are discussed in relation to the adsorption forces and the properties of the adsorbed substances. A thermodynamic interpretation of the results is also attempted.
橄榄壳通过用氢氧化钾进行化学活化来制备活性炭。评估了碳化和活化时间对碳性能的影响。通过在77K下进行N₂吸附来测量所制备碳的表面积。对具有最高表面积的碳进一步通过元素分析、粒度测量、 Boehm滴定、ζ电位测量和程序升温脱附（TPD）进行表征。随后，将它们用于在两个温度下吸附由咖啡酸、香草醛、香草酸、对羟基苯甲酸和没食子酸组成的多酚混合物，并将它们的吸附能力与商业活性炭Acticarbon CX进行比较，发现其吸附能力足够高。讨论了孔隙率和表面基团在吸附力和被吸附物质性质方面的作用。还尝试对结果进行热力学解释。
