Di-cationic epoxy resin one-step crosslinked chitosan/cellulose hydrogel for efficient dye and oily wastewater remediation. (15th October 2022)

• Record Type: Journal Article
• Authors: Li, Daikun; Zhang, Jun; Li, LiPin; Cai, Guiyuan; Zuo, Wei; Zhan, Wei; Wang, Pu; Tian, Yu
• Is Part Of: Journal of cleaner production. Volume 371(2022)
• Publication Date: 2022-10-15
• Subjects: Di-cationic epoxy resin -- Biopolymer hydrogel -- CR adsorption -- Oil/water separation; Factory and trade waste -- Management -- Periodicals; Manufactures -- Environmental aspects -- Periodicals; Déchets industriels -- Gestion -- Périodiques; Usines -- Aspect de l'environnement -- Périodiques; 628.5
• DOI: 10.1016/j.jclepro.2022.133650
• Languages: English
• ISSNs: 0959-6526

Abstract

Abstract: Introducing functional groups plays a critical role in improving the adsorption capacity of bio-polymer hydrogel absorbents. In this work, a novel di-cationic epoxy resin (N, N′-diglycidyl-N, N, N′, N′-tetramethyl-1, 3-propane diammonium dichloride, DCER) cross-linker is successfully synthesized. Chitosan/cellulose (CH/CU) hydrogels are obtained by simply one-step crosslinking by DCER. FT-IR and XPS spectra reveal that a large number of quaternary ammonium groups are introduced into CH/CU hydrogel. SEM image shows that the freeze-dried CH/CU hydrogel has interconnected microporous structure. The ECER crosslinked hydrogel shows extremely high adsorption efficiency for Congo red (CR) and the saturated adsorption capacity is 1404.5 mg/g, which is higher than most bio-polymer hydrogels. Isotherm and kinetic studies indicate that the adsorption of CR on DCER CH/CU hydrogel fits Langmuir isotherm and pseudo-second-order kinetic better. Unlike most reported biopolymer hydrogel adsorbents only exhibit good adsorption performance under a certain pH, DCER CH/CU hydrogel has high adsorption capacity in a wide pH range of 3–11. In addition, DCER CH/CU hydrogel can be used as a gel coating for superhydrophilic modification of polyester textile. The hydrogel coated fabric shows good oil resistance and can separate different types of oil/water mixtures with high efficiency and good durability. Hence, this multifunctional DCER CH/CU hydrogel has great potential for water remediation. Graphical abstract: Image 1