Departamento de Química Inorgánica, Facultad de Ciencias, Universidad de Granada, 18071 Granada, Spain.
J Hazard Mater. 2013 Dec 15;263 Pt 2:533-40. doi: 10.1016/j.jhazmat.2013.10.012. Epub 2013 Oct 30.
The specific adsorption of oxygenated and aliphatic gasoline components onto activated carbons (ACs) was studied under static and dynamic conditions. Ethanol and n-octane were selected as target molecules. A highly porous activated carbon (CA) was prepared by means of two processes: carbonization and chemical activation of olive stone residues. Different types of oxygenated groups, identified and quantified by TPD and XPS, were generated on the CA surface using an oxidation treatment with ammonium peroxydisulfate and then selectively removed by thermal treatments, as confirmed by TPD results. Chemical and porous transformations were carefully analyzed throughout these processes and related to their VOC removal performance. The analysis of the adsorption process under static conditions and the thermal desorption of VOCs enabled us to determine the total adsorption capacity and regeneration possibilities. Breakthrough curves obtained for the adsorption process carried out under dynamic conditions provided information about the mass transfer zone in each adsorption bed. While n-octane adsorption is mainly determined by the porosity of activated carbons, ethanol adsorption is related to their surface chemistry, and in particular is enhanced by the presence of carboxylic acid groups.
静态和动态条件下含氧和脂肪族汽油成分在活性炭（AC）上的特定吸附研究。选择乙醇和正辛烷作为目标分子。通过橄榄石残渣的碳化和化学活化两种方法制备了一种高孔活性炭（CA）。在 CA 表面上使用过硫酸铵氧化处理生成了不同类型的含氧基团，并通过 TPD 结果证实了这些含氧基团可以通过热处理选择性地去除。在这些过程中仔细分析了化学和多孔转化，并将其与 VOC 去除性能相关联。通过静态条件下的吸附过程分析和 VOC 的热解吸，可以确定总吸附容量和再生可能性。在动态条件下进行的吸附过程中获得的穿透曲线提供了有关每个吸附床中传质区的信息。虽然正辛烷的吸附主要取决于活性炭的孔隙率，但乙醇的吸附与活性炭的表面化学有关，特别是与存在羧酸基团有关。
