Multifunctional porous β-cyclodextrin polymer for water purification. (15th August 2022)

• Record Type: Journal Article
• Authors: Sun, Lin; Xu, Guizhou; Tu, Yizhou; Zhang, Wenrui; Hu, Xuejiao; Yang, Pingping; Wu, Daishe; Liang, Ying; Wei, Dongyang; Li, Aimin; Xie, Xianchuan
• Is Part Of: Water research. Volume 222(2022)
• Publication Date: 2022-08-15
• Subjects: β-cyclodextrin -- Multifunctional porous polymer -- Ionic liquid -- Disinfection -- Water treatment; β-CD β-cyclodextrin -- BCMBP 4, 4′-bis (chloromethyl)-1, 1′-biphenyl -- ETA 2, 3-Epoxypropyltrimethylammonium chloride -- BnBr benzyl bromide -- DMF N, N-dimethylformamide -- [BMIm]Cl 1-butyl-3-methylimidazolium chloride -- [BMIm]Cl/FeCl3 1-butyl-3-methylimidazolium chloride/ferric chloride -- QCD quaternized cyclodextrin -- BQCD benzylated-quaternized cyclodextrin -- BQCD-BP multifunctional β-cyclodextrin polymer -- AC activated carbon -- HA humic acid -- BPA bisphenol A; Water -- Pollution -- Research -- Periodicals; 363.7394
• DOI: 10.1016/j.watres.2022.118917
• Languages: English
• ISSNs: 0043-1354

Abstract

Highlights: Synthesize versatile β-cyclodextrin polymers with high specific surface area in an ionic liquid system. Remove organic micro-pollutants and NOM as well as kill pathogenic microorganisms simultaneously. Regulate the structure and surface properties of the polymer. Application for the removal of COD, TP, UV254 and disinfection in actual water bodies. Abstract: Keeping water clean is of vital significance for human health and environmental protection. In order to remove organic micro-pollutants and natural organic substances in water bodies and kill pathogenic microorganisms simultaneously, this study synthesized a multifunctional porous β-cyclodextrin polymer with a high specific surface area by introducing quaternary ammonium groups and rigid benzene rings, respectively, which was then polymerized with crosslinking agent-4, 4′-bis (chloromethyl)-1, 1′-biphenyl (BCMBP) in an ionic liquid system. The grafting of quaternary ammonium groups was beneficial for the removal of negative-charged humic acid (HA) and sterilization. The introduction of numerous rigid structures during benzylation and Friedel-Crafts alkylation reaction could significantly improve the porosity and specific surface area of the polymer, conducive to the exposure of cyclodextrin binding sites and contaminant adsorption. By changing the proportions of quaternization and benzylation, the structure and surface properties of the polymer could be adjusted, thus further regulating the adsorption performance. Compared with activated carbon, the polymer named BQCD-BP with a huge surface area of 1133 m 2 g −1 prepared under optimized conditions showed outstanding adsorption performance and sterilization ability. The pseudo-second-order kinetic constant of BQCD-BP reached 1.2058 g·mg −1 ·min −1, which was approximately 50 times greater than that of activated carbon (0.0256 g·mg −1 ·min −1 ) under the same experimental condition. The adsorption capacity of BQCD-BP to HA was twice as high as that to AC, and the antibacterial ability of BQCD-BP was significant, achieving 90% at the dosage of 1g L −1 . Moreover, the adsorption process was hardly affected by the hydrochemical conditions, and the polymer was easy to regenerate. In addition, the excellent adsorption and antibacterial performance of the polymer were also identified by natural water treatment. COD was almost completely removed, and the removal efficiency of TP reached 92% after contact with BQCD-BP. The sterilization rate of BQCD-BP to viable bacteria in complex water bodies reached 82%. Undoubtedly, BQCD-BP is a potential multifunctional water treatment material with reasonable design in the actual water purification. Graphical abstract: Image, graphical abstract