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International Journal of Polymer Science
Volume 2018, Article ID 8230965, 11 pages
https://doi.org/10.1155/2018/8230965
Research Article

Synthesis of a Cationic Polyacrylamide under UV Initiation and Its Flocculation in Estrone Removal

1School of River and Ocean Engineering, Chongqing Jiaotong University, Chongqing 400074, China
2Key Laboratory of Hydraulic and Waterway Engineering of the Ministry of Education, and National Engineering Research Center for Inland Waterway Regulation, Chongqing, China
3School of Civil Engineering and Architecture, Chongqing University of Science and Technology, Chongqing 401331, China

Correspondence should be addressed to Jiaoxia Sun; moc.621@tjqc8002xjs and Xiqin Ma; moc.621@7195am_niqix

Received 7 September 2017; Accepted 16 November 2017; Published 1 February 2018

Academic Editor: Robert A. Shanks

Copyright © 2018 Jiaoxia Sun et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

A ternary cationic polyacrylamide (CPAM) with the hydrophobic characteristic was prepared through ultraviolet- (UV-) initiated polymerization technique for the estrone (E1) environmental estrogen separation and removal. The monomers of acrylamide (AM), acryloyloxyethyl-trimethyl ammonium chloride (DAC), and acryloyloxyethyl dimethylbenzyl ammonium chloride (AODBAC) were used to synthesize the ternary copolymer (PADA). Fourier transform infrared spectroscopy (FT-IR), 1H nuclear magnetic resonance spectroscopy (1H NMR), thermogravimetry/differential scanning calorimetry (TG/DSC), and scanning electron microscopy (SEM) were employed to characterize the structure, thermal decomposition property, and morphology of the polymers, respectively. FT-IR and 1H NMR results indicated the successful formation of the polymers. Besides, with the introduction of hydrophobic groups (phenyl group), an irregular and porous surface morphology and a favorable thermal stability of the PADA were observed by SEM and TG/DSC analyses, respectively. At the optimal condition (pH = 7, flocculant dosage = 4.0 mg/L and E1 concentration = 0.75 mg/L), an excellent E1 flocculation performance (E1 removal rate: 90.1%, floc size: 18.3 μm, and flocculation kinetics:  s−1) was acquired by using the efficient flocculant PADA-3 (cationic degree = 40%, and intrinsic viscosity = 6.30 dL·g−1). The zeta potential and floc size analyses were used to analyze the possible flocculation mechanism for the E1 removal. Results indicated that the charge neutralization, adsorption, and birding effects were dominant in the E1 removal progress.