title: Adsorption of anionic MO or cationic MB from MO/MB mixture using polyacrylonitrile fiber hydrothermally treated with hyperbranched polyethylenimine.
abstract: One-step hydrothermal treatment of polyacrylonitrile fiber (PANF) with hyperbranched polyethylenimine (HPEI) resulted in zwitterionic PANF-g-HPEI that contained not only the grafted HPEI moieties but also many COOH groups generated in situ. Increasing the weight gain of PANF-g-HPEI from 10% to 90% resulted in the increase of its COOH, amino and amide groups from 0.12 to 1.86 mmol/g, 1.44 to 8.90 mmol/g, and 0.67 to 2.12 mmol/g, respectively. Dye adsorption experiments demonstrated that (1) such PANF-g-HPEIs could effectively adsorb anionic Methyl Orange (MO) or cationic Methylene Blue (MB), through the pretreatment with acidic or basic solution, respectively; (2) PANF-g-HPEIs could selectively adsorb the anionic MO or the cationic MB from MO/MB mixture through the pretreatment with solution of pH=5 or 10, respectively; (3) the cationic or anionic dyes adsorbed by PANF-g-HPEIs could be reversibly desorbed by the aqueous solution of pH=1 or 10, respectively; (4) PANF-g-HPEI could be recycled efficiently, and its dye adsorption performances did not show pronounced loss even after 10 adsorption/desorption cycles, superior to PANF treated with the low molar-mass polyamines.
authors.affiliation: Department of Chemistry, School of Sciences, Tianjin University, and Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, PR China.
authors.forename: You
authors.initials: Y
authors.lastname: Fan
authors.affiliation: Department of Chemistry, School of Sciences, Tianjin University, and Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, PR China.
authors.forename: Hua-Ji
authors.initials: HJ
authors.lastname: Liu
authors.affiliation: Department of Chemistry, School of Sciences, Tianjin University, and Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, PR China.
authors.forename: Yao
authors.initials: Y
authors.lastname: Zhang
authors.affiliation: Department of Chemistry, School of Sciences, Tianjin University, and Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, PR China. Electronic address: chenyu@tju.edu.cn.
authors.forename: Yu
authors.initials: Y
authors.lastname: Chen
mesh_terms: D000180:Acrylic Resins / Q000737:chemistry*; D000327:Adsorption; D001391:Azo Compounds / Q000737:chemistry*; D008751:Methylene Blue / Q000737:chemistry*; D011094:Polyethyleneimine / Q000737:chemistry*; D014865:Waste Disposal, Fluid / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000737:chemistry*
chemical_list: D000180:Acrylic Resins; D001391:Azo Compounds; D014874:Water Pollutants, Chemical; C010504:polyacrylonitrile; C100258:methyl orange; D011094:Polyethyleneimine; D008751:Methylene Blue
keywords: Dye; Hyperbranched polyethylenimine; Polyacrylonitrile fiber; Recyclable; Selective adsorption