Preparing γ-Cyclodextrin-Immobilized Starch and the Study of its Removal Properties to Dyestuff from Wastewater
Zhang Hao 1, 2  
Zhang Yi 2  
Cheng Bowen 1  
Li Yaxing 2  
Zhou Sheng 2  
More details
Hide details
State Key Laboratory of Separation Membranes and Membrane Processes, Tianjin Polytechnic University, Tianjin, P.R. China
School of Textiles, Tianjin Polytechnic University, Tianjin, P.R. China
Online publish date: 2019-01-18
Publish date: 2019-02-18
Submission date: 2018-03-02
Final revision date: 2018-04-13
Acceptance date: 2018-04-17
Pol. J. Environ. Stud. 2019;28(3):1701–1711
A novel natural polymeric adsorbing material γ-cyclodextrin immobilized starch (CS- γCD) was prepared by introducing host functional molecule γ-cyclodextrin (γ-CD) into starch, using epichlorohydrin (ECH) as a cross-linking agent and sodium hydroxide as a catalyst, via the aqueous-phase synthesis method. The γ-cyclodextrin content in CS-γCD was up to 8.15% determined by the bromocresol green (BCG) hyperchromic spectrophotometric method. The structures of CS-γCD were characterized by infrared spectrum (FT-IR), 13C-nuclear magnetic resonance spectrum (13C-NMR), scanning electron microscope (SEM), x-ray diffraction (XRD), and gel permeation chromatography (GPC). We investigated the adsorption performances and kinetics of CS-γCD to three different kinds of dyestuff including methylene blue (MB), methyl purple (MP), and congo red (CR). The results showed the adsorbing capacities of CS-γCD to three kinds of dyes had obviously increased compared with native starch and diatomite, and the CS-γCD was also found to have a significant advantage in adsorption of macro-molecule dye such as CR over other adsorbing materials. The adsorption behaviors of CS-γCD on the three dyestuffs could be better described by a Langmuir model (R2>0.99), but also had relatively high correlation to Freundlich model. The pseudo second-order model could better describe the adsorption behaviors. The CS-γCD could be enzymolysised, while its degradation rate was much lower than native starch, which indicated that CS-γCD had a relatively higher structural stability and longer service life, these characters could be beneficial for the popularization and application of CS-γCD in fields of wastewater treatment and environment remediation.