Effect of activated carbon surface oxygen- and/or nitrogen-containing groups on adsorption of copper(II) ions from aqueous solution
Effect of activated carbon surface oxygen- and/or nitrogen-containing groups on adsorption of copper(II) ions from aqueous solution
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DOI：
10.1021/la9815704
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发表时间：
1999-08-31
期刊：
影响因子：
3.9
通讯作者：
Swiatkowski, A
中科院分区：
文献类型：
--
作者：
Biniak, S;Pakula, M;Swiatkowski, A
研究了不同表面含氧和/或含氮基团的改性活性炭对铜离子的吸附性能。使用预先脱灰和化学改性的商业活性炭D-43/1（Carbo-Tech，埃森，德国）。通过用HCl、NaOH和NaOC（2）H（5）进行标准中和滴定来估计改性碳表面的化学性质。测定了三种改性活性炭对不同pH值的CuSO（4）水溶液中CU（2+）离子的吸附性能。用X射线光电子能谱（XPS）、傅里叶变换红外光谱（FT-IR）对吸附有Cu ~（2+）离子的炭样品进行了分析。此外，使用粉末活性炭电极进行电化学测量（循环伏安法）。虽然所采用的改性程序仅轻微改变表面，但它们强烈影响表面化学结构。碱性基团在热处理样品中占主导地位;酸性官能团在氧化样品中占主导地位。铜离子吸附研究和光谱和电化学测量表明，吸附的离子与碳表面以不同的方式相互作用。吸附离子的数量取决于表面酸碱官能团的性质和数量以及水溶液中的pH平衡。总结并讨论了金属离子与碳表面官能团相互作用的可能机理。
The adsorption properties of a modified activated carbon with various oxygen- and/or nitrogen-containing surface groups toward copper ions was studied. Previously de-ashed and chemically modified commercial activated carbon D-43/1 (Carbo-Tech, Essen, Germany) was used. The chemical properties of the modified carbon surface were estimated by standard neutralization titration with HCl, NaOH, and NaOC(2)H(5). The adsorption of CU(2+) ions on three modified activated carbons from aqueous CuSO(4) solution of various pH was measured. The carbon samples with adsorbed CU2+ ions were analyzed by spectroscopic methods (X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy). In addition, an electrochemical measurement (cyclic voltammetry) was performed using powdered activated carbon electrodes. While the modification procedures employed alter the surface only slightly, they strongly influence the surface chemical structure. Basic groups are predominant in the heat-treated samples; acidic functional groups are predominant in the oxidized sample. Both the copper cation adsorption studies and the spectral and electrochemical measurements show that adsorbed ions interact with the carbon surface in different ways. The number of adsorbed ions depends on the nature and quantity of surface acid-base functionalities and on the pH equilibrium in the aqueous solution. The possible mechanisms of interactions between metal ions and carbon surface functionalities are summarized and discussed.