title: Studies on the adsorption of sulfo-group-containing aromatics by chitosan-β-cyclodextrin.
abstract: Chitosan-β-cyclodextrin (CTS-CD) prepared through a crosslinking reaction between chitosan and β-cyclodextrin was employed to adsorb the three following sulfo-group-containing aromatics: disodium 2-naphthol-3,6-disulfonate (R salt), 2-naphthalene sulfonic acid (NSA), and sodium dodecylbenzene sulfonate (SDBS). At 318 K, the saturated adsorption capacity of CTS-CD for R salt, NSA, and SDBS was 431, 416, and 376 mg/g, respectively. The experimental data fitted the second-order model well and the rate constant of the adsorption increased with the temperature increment. The values of apparent activation energy for R salt, NSA, and SDBS were calculated as 33.2, 34.2, and 16.8 kJ/mol respectively. The isothermal adsorption was found following the Langmuir adsorption equation. The negative values of ΔG and the positive values of ΔH indicated that the adsorption process was spontaneous and exothermic.
authors.affiliation: School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai, People's Republic of China. wjshi@usst.edu.cn
authors.forename: Wenjian
authors.initials: W
authors.lastname: Shi
authors.forename: Shuwei
authors.initials: S
authors.lastname: Chen
authors.forename: Fei
authors.initials: F
authors.lastname: Chang
authors.forename: Yue
authors.initials: Y
authors.lastname: Han
authors.forename: Yuanzhang
authors.initials: Y
authors.lastname: Zhang
mesh_terms: D000327:Adsorption; D048271:Chitosan / Q000737:chemistry*; D006841:Hydrocarbons, Aromatic / Q000302:isolation & purification*; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D008956:Models, Chemical; D013457:Sulfur Compounds / Q000737:chemistry*; D013696:Temperature; D013997:Time Factors; D047392:beta-Cyclodextrins / Q000737:chemistry*
chemical_list: D006841:Hydrocarbons, Aromatic; D013457:Sulfur Compounds; D047392:beta-Cyclodextrins; C571277:chitosan-beta-cyclodextrin; D048271:Chitosan