title: Ring-like structured chitosan-metal hydrogel: Mass production, formation mechanism and applications.
abstract: To improve the solid/liquid separation of chitosan adsorbents as well as the adsorption ability, chitosan was molded in several shapes. However, the ring-like structures of chitosan which have relatively larger surface area and higher chemical accessibility, but low-pressure drops than their plate-like counterparts has not been reported. In this study, we put forward a novel concept to fabricate a kind of highly efficient ring-like structured chitosan hydrogel through a sulfate ionic crosslinking method, its mass production and formation mechanism has been fully proposed. The ring-like chitosan-Fe(III) hydrogel exhibits the outstanding performance with AR73 removal rate of 98.53% and Cr(VI) removal rate of 90.53%, respectively. The adsorption of AR73 is well described by the pseudo-second-order model and Langmuir isotherm model, which indicates chitosan-Fe(III) hydrogel ring possesses a considerable adsorption capacity of 205.2mg/g. In addition, chitosan-Fe(III) hydrogel ring could efficiently adsorb both AR73 and Cr(VI) simultaneously (96.9% and 85.9%, respectively). Overall, this work provides a facile method to prepare ring-like structured chitosan-metal hydrogel, which can be mass-produced as multifunctional materials for practical application.
authors.affiliation: College of Biological and Environmental Engineering, Zhejiang University of Technology, Hangzhou 310014, China; MOE Key Laboratory of Environmental Remediation & Ecosystem Health, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China.
authors.forename: Hao
authors.initials: H
authors.lastname: Zhou
authors.affiliation: MOE Key Laboratory of Environmental Remediation & Ecosystem Health, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China.
authors.forename: LiLi
authors.initials: L
authors.lastname: Xu
authors.affiliation: MOE Key Laboratory of Environmental Remediation & Ecosystem Health, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China. Electronic address: wenyuezhong@zju.edu.cn.
authors.forename: Yuezhong
authors.initials: Y
authors.lastname: Wen
authors.affiliation: College of Biological and Environmental Engineering, Zhejiang University of Technology, Hangzhou 310014, China.
authors.forename: Kunde
authors.initials: K
authors.lastname: Lin
authors.affiliation: College of Pharmaceutics and Material Engineering, Jinhua Polytechnic, Jinhua 321007, China.
authors.forename: Xiaomei
authors.initials: X
authors.lastname: Zeng
keywords: AR73; Adsorption; Chitosan-Fe(III) hydrogel ring; Cr(VI); Dye; Multifunctional materials