title: A nonlinear isotherm model for sorption of anionic dyes on cellulose fibers: a case study.
abstract: The sorption data of an anionic dye on cellulose fiber are often correlated with a log-linear model to determine the internal accessible volume of the fiber to the anionic dye (V, L/kg) and as such the standard affinity of the anionic dye to the fiber (-Δμ°, J/mol), but without taking into account the influence of ionized carboxyl groups due to cellulose oxidation ([COO(-)]f, mol/kg). In this study, a nonlinear isotherm model was derived by incorporating [COO(-)]f, V and -Δμ° as three model parameters. A set of classical sorption data of C. I. Direct Blue 1 on bleached cotton was correlated with the nonlinear isotherm model. The nonlinear curve fitting analysis showed that the nonlinear isotherm model was in excellent agreement with the sorption data and robust to determine the values of [COO(-)]f, V and -Δμ° for describing the sorption behaviors of anionic dyes on cellulose fibers.
authors: Key Laboratory of Eco-textiles (Ministry of Education), College of Textiles and Clothing, Jiangnan University, 1800 Lihu Avenue, Wuxi, Jiangsu 214122, China.
authors: Changhai
authors: C
authors: Xu
authors: Key Laboratory of Eco-textiles (Ministry of Education), College of Textiles and Clothing, Jiangnan University, 1800 Lihu Avenue, Wuxi, Jiangsu 214122, China.
authors: Wenjuan
authors: W
authors: Tang
authors: Key Laboratory of Eco-textiles (Ministry of Education), College of Textiles and Clothing, Jiangnan University, 1800 Lihu Avenue, Wuxi, Jiangsu 214122, China. Electronic address: jinmei_du@jiangnan.edu.cn.
authors: Jinmei
authors: J
authors: Du
keywords: Anionic dye; Cellulose; Cellulose oxidation; Internal accessible volume; Isotherm model; Sorption equilibrium; Standard affinity