Synthesis of Cross-linked Carboxyl Modified Polyvinyl Alcohol and its Application in Selective Adsorption Separation of Cu(II) from Cd(II) and Ni(II).

Autor: Zeng, Lelin1,2 (AUTHOR), Zhou, Feixiang1 (AUTHOR) 779038329@qq.com, Hu, Rong3 (AUTHOR), Xie, Wanyun1 (AUTHOR), Wang, Guoxiang1 (AUTHOR) wanggxwzl@163.com, Yang, Caixia1 (AUTHOR), Liang, Enxiang1 (AUTHOR) 32625445@qq.com, Xu, Wenyuan1 (AUTHOR), Van der Bruggen, Bart2,4 (AUTHOR)
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Zdroj: Journal of Polymers & the Environment. Jan2021, Vol. 29 Issue 1, p28-37. 10p.
Abstrakt: A cross-linked copolymer (XL-P(AA-co-VAc)) of vinyl acetate and acrylic acid was prepared using azobisisobutyronitrile as initiator and N,N'-methylenebisacrylamide as crosslinker. Then, XL-P(AA-co-VAc) was reacted with ethanol to prepare a crosslinked carboxyl modified polyvinyl alcohol (XL-P(AA-co-VA)). The as-prepared XL-P(AA-CO-VA) hydrogel was characterized by FTIR, XRD, SEM and BET, and investigated as an selective heavy metal ion adsorbent. The adsorption characteristics of the XL-P(AA-CO-VA) hydrogel were studied with a aqueous solution containing ternary metal ions Cu(II), Cd(II) and Ni(II). It was found that XL-P(AA-CO-VA) can selectively adsorb Cu(II) in competition with Cd(II) and Ni(II), and the selectivity coefficients of 48 (βCu(II)/Cd(II)) and 80 (βCu(II)/Ni(II)) were obtained. The kinetics were demonstrated to match well with the pseudo-second order kinetics model with the rate constants (K2, g/(mg•min)) of 3.71✕10− 4, 0.0011 and 0.0015 for Cu(II), Cd(II) and Ni(II), respectively. The equilibrium adsorption of Cu(II) to the XL-P(AA-CO-VA) hydrogel follows the Langmuir adsorption model with qmax of 41.27 mg/g and KL of 0.94 L/mg. The thermodynamic studies indicate that ΔG0 was negative and increased with temperature, and the adsorption process of XL-P(AA-CO-VA) for Cu(II) ion was spontaneous and exothermic. ΔH and ΔS were − 56.57 kJ/mol and − 171.18 J·(mol·K)−1, respectively. The XL-P(AA-CO-VA) hydrogel is of interest for the selective separation of Cu(II) from industrial wastewater containing Cd(II) and Ni(II). [ABSTRACT FROM AUTHOR]
Databáze: GreenFILE
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