Importance of structural and chemical heterogeneity of activated carbon surfaces for adsorption of dibenzothiophene
Importance of structural and chemical heterogeneity of activated carbon surfaces for adsorption of dibenzothiophene
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DOI：
10.1021/la050772e
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发表时间：
2005-08-16
期刊：
影响因子：
3.9
通讯作者：
Bandosz, TJ
中科院分区：
文献类型：
--
作者：
Ania, CO;Bandosz, TJ
评价了不同碳源(塑料垃圾、煤和木材)制备的各种活性碳作为液体碳氢燃料脱硫剂的性能。为了提高碳表面的非均质性，用过硫酸铵氧化对碳表面进行了改性。结果表明，活性炭孔大小和表面化学对二苯并硫酚(DBT)的吸附具有重要意义。DBT在活性碳上的吸附由两种类型的作用决定：物理作用和化学作用。前者包括碳微孔网络中的弥散相互作用。微孔的体积控制着物理吸附的量，而中孔控制着过程的动力学。另一方面，表面官能团的引入提高了活性碳的性能，这是由于碳的酸中心与DBT分子的基本结构以及硫-硫相互作用的结果。
The performance of various activated carbons obtained from different carbon precursors (i.e., plastic waste, coal, and wood) as adsorbents for the desulfurization of liquid hydrocarbon fuels was evaluated. To increase surface heterogeneity, the carbon surface was modified by oxidation with ammonium persulfate. The results showed the importance of activated carbon pore sizes and surface chemistry for the adsorption of dibenzothiophene (DBT) from liquid phase. Adsorption of DBT on activated carbons is governed by two types of contributions: physical and chemical interactions. The former include dispersive interactions in the microporous network of the carbons. While the volume of micropores governs the amount physisorbed, mesopores control the kinetics of the process. On the other hand, introduction of surface functional groups enhances the performance of the activated carbons as a result of specific interactions between the acidic centers of the carbon and the basic structure of DBT molecule as well as sulfur-sulfur interactions.