Ring-like structured chitosan-metal hydrogel: Mass production, formation mechanism and applications

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• 作者：Hao Zhou^a ; ^b ; LiLi Xu^b ; Yuezhong Wen^b ; ^{wenyuezhong@zju.edu.cn} ; Kunde Lin^a ; Xiaomei Zeng^c
• 关键词：Chitosan-Fe(III) hydrogel ring ; Adsorption ; AR73 ; Cr(VI) ; Dye ; Multifunctional materials
• 刊名：Journal of Colloid and Interface Science
• 出版年：2017
• 出版时间：15 March 2017
• 年：2017
• 卷：490
• 期：Complete
• 页码：233-241
• 全文大小：2764 K
• 卷排序：490

文摘

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 205.2 mg/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.