El-Sayed Yehya, Bandosz Teresa J
Department of Chemistry, The City College of New York, and The Graduate School of City University of New York, New York, NY 10031, USA.
J Colloid Interface Sci. 2004 May 1;273(1):64-72. doi: 10.1016/j.jcis.2003.10.006.
Adsorption of valeric acid was studied on two activated carbons of different origins, wood and bituminous coal. The effect of oxidation on the adsorption uptake was investigated. Both initial samples were oxidized with nitric acid, which caused the introduction of a significant number of oxygen-containing groups onto the carbon surface. Boehm titration, potentiometric titration, thermal analysis, and sorption of nitrogen were used for detailed surface characterization. Valeric acid adsorption from aqueous solution was measured at 333 K. The calculated isotherms showed a good fitting to the Freundlich equation. The capacity coefficients revealed a direct correlation with the number of basic groups present on the surface. The amount of valeric acid adsorbed at its low concentration is dependent on the number of basic groups, whereas at high concentration the amount adsorbed depends on the volume of micropores smaller than 10 A, where the adsorption potential is the strongest.
研究了戊酸在两种不同来源的活性炭（木质活性炭和烟煤活性炭）上的吸附情况。研究了氧化对吸附量的影响。两种初始样品均用硝酸氧化，这导致在碳表面引入了大量含氧基团。采用 Boehm 滴定法、电位滴定法、热分析法和氮吸附法对表面进行详细表征。在 333 K 下测定了戊酸从水溶液中的吸附量。计算得到的等温线与 Freundlich 方程拟合良好。容量系数与表面存在的碱性基团数量呈直接相关。戊酸在低浓度下的吸附量取决于碱性基团的数量，而在高浓度下，吸附量取决于小于 10 Å 的微孔体积，此处吸附势最强。
