An experimental and theoretical study of the adsorption of aromatics possessing electron-withdrawing and electron-donating functional groups by chemically modified activated carbons
An experimental and theoretical study of the adsorption of aromatics possessing electron-withdrawing and electron-donating functional groups by chemically modified activated carbons
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DOI：
10.1016/s0008-6223(97)00072-9
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发表时间：
1997-01-01
期刊：
影响因子：
10.9
通讯作者：
Scaroni, AW
中科院分区：
文献类型：
--
作者：
Radovic, LR;Silva, IF;Scaroni, AW
系统地研究了模型芳香族化合物(苯胺和硝基苯)在化学定制的活性碳上的吸附。控制溶液pH条件下的吸附实验证实，静电和分散的吸附/吸附剂相互作用对离子和非离子吸附物种的平衡吸收有显著影响。对于苯胺(一种弱电解液)，当溶液pH接近吸附物的零电荷点(pH(PZC))时，氧化碳表面的吸收率最大。相反，非解离的硝基苯的吸收率在热处理表面得到增强，石墨烯层不受吸电子官能团的干扰，特别是在溶液pH类似于pH(PZC)的情况下。在此提出了一个理论模型，可以成功地解释观察到的趋势，作为一个急需的预测实验条件和吸附剂表面化学性质，将最大限度地吸收芳香族化合物的活性碳。(C)1997年爱思唯尔科学有限公司。
The adsorption of model aromatic compounds (aniline and nitrobenzene) on chemically tailored activated carbons has been systematically investigated. Adsorption experiments at controlled solution pH conditions confirmed that both electrostatic and dispersive adsorbate/adsorbent interactions can have a significant influence on the equilibrium uptakes of ionic and nonionic adsorbate species. For aniline (a weak electrolyte), maximum uptakes were found on oxidized carbon surfaces at solution pH near the adsorbate's point of zero charge (pH(PZC)). In contrast, nondissociating nitrobenzene uptakes were enhanced on heat-treated surfaces with graphene layers unperturbed by electron-withdrawing Functional groups, particularly at solution pH similar to pH(PZC). A theoretical model that can successfully account for the observed trends is hereby proposed as a much needed predictor of the experimental conditions and adsorbent surface chemical properties that will maximize the uptake of aromatic compounds by activated carbons. (C) 1997 Elsevier Science Ltd.