Role of surface chemistry in adsorption of phenol on activated carbons
Role of surface chemistry in adsorption of phenol on activated carbons
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DOI：
10.1016/s0021-9797(03)00420-x
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发表时间：
2003-08-15
影响因子：
9.9
通讯作者：
Bandosz, TJ
中科院分区：
文献类型：
--
作者：
Salame, II;Bandosz, TJ
用过硫酸铵氧化两种木质活性炭样品。用氮吸附法和Boehm滴定法分别表征了样品及其氧化产物的结构性质和表面化学性质。在不保持溶液特定pH值的情况下，在接近环境温度下研究了溶液（微量浓度）对苯酚的吸附。结果表明，正如预期的那样，苯酚的吸收取决于碳的孔隙度和表面化学性质。此外。苯酚的吸附表现出对羧基数量的强烈依赖性，主要有两个因素：(1)苯酚与碳表面的羧基发生反应，形成酯键；(2)碳表面的羧基使活性炭芳香环基体上的pi电子消失，导致苯酚苯环与碳基面的相互作用强度降低，从而降低了苯酚的吸收率。(C) 2003 Elsevier Inc.版权所有。
Two samples of activated carbon of wood origin were oxidized using ammonium persulfate. The structural properties and surface chemistry of the samples and their oxidized counterparts were characterized using sorption of nitrogen and Boehm titration, respectively. Phenol adsorption from solution (at trace concentrations) was studied at temperatures close to ambient without maintaining a specific pH of the solution. The results showed, as expected, that the phenol uptake is dependent on both the porosity and surface chemistry of the carbons. Furthermore. phenol adsorption showed a strong dependence on the number of carboxylic groups due to two factors: (1) phenol reacts with carboxylic groups on the carbon surface, forming an ester bond, and (2) carboxylic groups on the carbon surface remove the pi-electron from the activated carbon aromatic ring matrix, causing a decrease in the strength of interactions between the benzene ring of phenol and the carbon's basal planes, which decreases the uptake of phenol. (C) 2003 Elsevier Inc. All rights reserved.