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    Adsorption Behavior of Polycyclic Aromatic Hydrocarbons on Zn-Based Coordination Cluster Zns(5): Competition, Synergy, and Mechanism

    Year: 2019

    Journal: Langmuir, Volume 35, DEC 10, page 16071–16078

    Authors: Ma, Qiong; Zhang, Yingying; Dang, Xueping; Huang, Jianlin; Ai, Youhong; Chen, Huaixia

    Organizations: National Nature Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [21804034]; Open Fund of Ministry-of-Education Key Laboratory for the Synthesis and Application of Organic Functional Molecules [KLSAOFM1801]

    In this work, adsorption behaviors of pyrene (PYR), fluoranthene (FLT), phenanthrene (PHE), and fluorene (FLU) on the coordination cluster [Zn-5(H2Ln)(6)](-)(NO3)(4)]center dot 8H(2)O center dot 2CH(3)OH (Zn-5) were studied. The adsorption mechanism and spectrum analyses revealed that the synergistic effect of hydrophobic interaction, pi-pi stacking, and N-H center dot center dot center dot pi interaction played a crucial role during the adsorption process. The maximum adsorption capacities of PYR, FLT, PHE, and FLU were 406.4, 399.7, 153.7, and 114.3 mg g(-1), respectively, resulting from the Langmuir isotherm model. Quick removal of PYR and FLT was found in kinetic experiments with the adsorption equilibrium being reached within 1 min. Competitive adsorption indicated that the adsorption sites for PYR, FLT, PHE, and FLU on Zn-5 were identical, and synergistic effects also existed in the adsorption process. Therefore, Zn-5 has the potential to be used as an adsorbent in the field of wastewater treatment.
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