Adsorption of polycyclic aromatic hydrocarbons from water using petroleum coke-derived porous carbon.
Adsorption of polycyclic aromatic hydrocarbons from water using petroleum coke-derived porous carbon.
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DOI：
10.1016/j.jhazmat.2010.05.130
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发表时间：
2010-09
影响因子：
13.6
通讯作者：
M. Yuan;S. Tong;Suoqi Zhao;C. Jia
中科院分区：
文献类型：
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作者：
M. Yuan;S. Tong;Suoqi Zhao;C. Jia
以石油焦为原料，采用KOH化学活化法制备多孔炭，表征多孔炭的结构，并将多孔炭用作吸附剂，吸附水中萘、芴、菲、芘和荧蒽等多环芳烃（PAHs）。这些碳的比表面积（SSA）范围为562至1904 m2/g，而它们的零电荷点（pHPZC）范围为2.6至8.8。多环芳烃在四种碳上的吸附均符合非线性Freundlich方程。对于任何给定的PAH组中，吸附容量参数Kf，增加SSA和pHPZC的碳，证实分散相互作用的作用。对于任何给定的碳，Kff值的顺序为萘>芴>菲>芘。Kfon分子大小的这种依赖性表明这些碳对大的多环芳烃有一定程度的分子筛行为。在所研究的条件下，吸收过程可能是由扩散传输过程控制。竞争吸附对混合多环芳烃的平衡吸附起不了重要作用。总的来说，石油焦衍生的多孔炭对这些多环芳烃的吸附是非常有效的。
Porous carbons were prepared from petroleum coke by KOH chemical activation, characterized and used as adsorbents for uptaking a mixture of polycyclic aromatic hydrocarbons (PAHs): naphthalene, fluorene, phenanthrene, pyrene and fluoranthene from aqueous solutions. The specific surface area (SSA) of these carbons ranges from 562 to 1904m2/g, while their point of zero charge (pHPZC) varies from 2.6 to 8.8. The equilibrium adsorption of PAHs on all four carbons follows the non-linear Freundlich equation well. For any given PAH in the group, the adsorption capacity parameter Kf, increases with the SSA and pHPZCof the carbons, confirming the roles of dispersive interactions. For any given carbon, the value of Kffollows the order of naphthalene>fluorene>phenanthrene>pyrene. This dependence of Kfon molecular size suggests a certain degree of molecular sieving behavior of these carbons toward large PAHs. Under the condition studied, the uptake process is likely controlled by diffusive transport processes. And, it is unlikely that the competitive adsorption played any important roles in determining equilibrium adsorption of the mixed PAHs. Overall, the petroleum coke-derived porous carbon is very effective in adsorbing these PAHs.