title: Adsorption Removal of Environmental Hormones of Dimethyl Phthalate Using Novel Magnetic Adsorbent.
abstract: Magnetic polyvinyl alcohol adsorbent M-PVAL was employed to remove and concentrate dimethyl phthalate DMP. The M-PVAL was prepared after sequential syntheses of magnetic Fe3O4 (M) and polyvinyl acetate (M-PVAC). The saturated magnetizations of M, M-PVAC, and M-PVAL are 57.2, 26.0, and 43.2 emu g(-1) with superparamagnetism, respectively. The average size of M-PVAL by number is 0.75 μm in micro size. Adsorption experiments include three cases: (1) adjustment of initial pH (pH0) of solution to 5, (2) no adjustment of pH0 with value in 6.04-6.64, and (3) adjusted pH0 = 7. The corresponding saturated amounts of adsorption of unimolecular layer of Langmuir isotherm are 4.01, 5.21, and 4.22 mg g(-1), respectively. Values of heterogeneity factor of Freundlich isotherm are 2.59, 2.19, and 2.59 which are greater than 1, revealing the favorable adsorption of DMP/M-PVAL system. Values of adsorption activation energy per mole of Dubinin-Radushkevich isotherm are, respectively, of low values of 7.04, 6.48, and 7.19 kJ mol(-1), indicating the natural occurring of the adsorption process studied. The tiny size of adsorbent makes the adsorption take place easily while its superparamagnetism is beneficial for the separation and recovery of micro adsorbent from liquid by applying magnetic field after completion of adsorption.
authors.affiliation: Graduate Institute of Environmental Engineering, National Taiwan University, Taipei 106, Taiwan.
authors.forename: Chia-Chi
authors.initials: CC
authors.lastname: Chang
authors.affiliation: Graduate Institute of Environmental Engineering, National Taiwan University, Taipei 106, Taiwan.
authors.forename: Jyi-Yeong
authors.initials: JY
authors.lastname: Tseng
authors.affiliation: Graduate Institute of Environmental Engineering, National Taiwan University, Taipei 106, Taiwan.
authors.forename: Dar-Ren
authors.initials: DR
authors.lastname: Ji
authors.affiliation: Department of Cosmetic Science and Application, Lan-Yang Institute of Technology, Yilan 261, Taiwan.
authors.forename: Chun-Yu
authors.initials: CY
authors.lastname: Chiu
authors.affiliation: Graduate Institute of Environmental Engineering, National Taiwan University, Taipei 106, Taiwan.
authors.forename: De-Sheng
authors.initials: DS
authors.lastname: Lu
authors.affiliation: Graduate Institute of Environmental Engineering, National Taiwan University, Taipei 106, Taiwan ; Department of Chemical Engineering, National Taiwan University, Taipei 106, Taiwan.
authors.forename: Ching-Yuan
authors.initials: CY
authors.lastname: Chang
authors.affiliation: Graduate Institute of Environmental Engineering, National Taiwan University, Taipei 106, Taiwan ; Department of Chemical Engineering and Biotechnology, National Taipei University of Technology, Taipei 106, Taiwan.
authors.forename: Min-Hao
authors.initials: MH
authors.lastname: Yuan
authors.affiliation: Department of Environmental Science and Engineering, Tunghai University, Taichung 407, Taiwan.
authors.forename: Chiung-Fen
authors.initials: CF
authors.lastname: Chang
authors.affiliation: Department of Environmental Engineering, National I-Lan University, Yilan 260, Taiwan.
authors.forename: Chyow-San
authors.initials: CS
authors.lastname: Chiou
authors.affiliation: Department of Chemical Engineering and Biotechnology, National Taipei University of Technology, Taipei 106, Taiwan.
authors.forename: Yi-Hung
authors.initials: YH
authors.lastname: Chen
authors.affiliation: Department of Environmental Engineering, National I-Lan University, Yilan 260, Taiwan.
authors.forename: Je-Lueng
authors.initials: JL
authors.lastname: Shie
mesh_terms: D000327:Adsorption; D003198:Computer Simulation; D004785:Environmental Pollutants / Q000302:isolation & purification*; D006728:Hormones / Q000302:isolation & purification*; D006863:Hydrogen-Ion Concentration; D008280:Magnetics; D010795:Phthalic Acids / Q000737:chemistry*; D011142:Polyvinyl Alcohol / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared; D055672:Static Electricity; D013696:Temperature
chemical_list: D004785:Environmental Pollutants; D006728:Hormones; D010795:Phthalic Acids; C024629:dimethyl phthalate; D011142:Polyvinyl Alcohol