Enhanced adsorption of pharmaceuticals onto core-brush shaped aromatic rings-functionalized chitosan magnetic composite particles: Effects of structural characteristics of both pharmaceuticals and brushes. (20th January 2018)

• Record Type: Journal Article
• Authors: Zhou, Xia; Dong, Chang; Yang, Zhen; Tian, Ziqi; Lu, Lishi; Yang, Weiben; Wang, Yuping; Zhang, Limin; Li, Aimin; Chen, Jianqiang
• Is Part Of: Journal of cleaner production. Volume 172(2018)
• Page Start: 1025
• Page End: 1034
• Publication Date: 2018-01-20
• Subjects: Core-brush shaped adsorbents -- Pharmaceuticals -- pH resistance -- Enhanced adsorption -- π-Electron-containing interaction -- Electrostatic attraction; 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.2017.10.207
• Languages: English
• ISSNs: 0959-6526

Abstract

Abstract: Core-brushes shaped chitosan/Fe3 O4 composite particles (CS-MCPs) have been demonstrated applicable in the removal of pharmaceuticals due to the large amounts of functional groups on branches and heightened approachability of flexible branches to contaminants. To further enhance adsorption capacity ( Q e ) and pH-resistance, novel representative core-brushes shaped aromatic rings-functionalized CS-MCPs were used for adsorption of typical pharmaceuticals (norfloxacin, tylosin and diclofenac sodium (DCF)). For norfloxacin and tylosin, modified CS-MCP with polyanions (poly(sodium p-styrenesulfonate)) branches exhibited high Q e (165 mg/g and 134 mg/g, respectively); whereas for DCF, modified CS-MCP with polycations (poly(p-vinylbenzyl trimethylammonium chloride)) branches is favored (151 mg/g). Due to existence of phenyl groups on branches, Q e remained high levels in a wide pH range, proving improved pH-resistance. Considerable resistance against coexisting pharmaceuticals and inorganic ions, as well as reusability, of the adsorbents, were found. Physico-chemical analyses, instrumental characterizations and theoretical calculations demonstrated that electrostatic attraction and π-electron-containing interactions contributed to adsorption: charged ends of contaminants were fixed to oppositely charged part of branches; whereas other fragments of pharmaceutical molecules bound with π-electrons of phenyls on branches. The novel core-brush shaped biopolymer-based MCPs showed potential in water treatment and guidance for designing the brush characteristics was provided according to pharmaceutical characteristics. Graphical abstract: Image 1 Highlights: Core-brush shaped aromatic rings-modified chitosan MCPs are used for adsorption. The adsorbents have enhanced adsorption capacities for pharmaceuticals. The high Q e are with resistance of pH, coexisting pharmaceuticals and inorganic salts. Effects of structural characteristics of both pharmaceuticals and brushes are studied. Mechanism is studied via both experimental analyses and theoretical calculations.