标题: Highly efficient and selective removal of Pb2+ by ultrafast synthesis of HKUST-1: Kinetic, isotherms and mechanism analysis
作者: Wang, Y (Wang, Yan); Li, MW (Li, Mengwei); Hu, J (Hu, Jing); Feng, WP (Feng, Wenpei); Li, JJ (Li, Junjun); You, ZX (You, Zhixiong)
来源出版物: COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS 卷: 633 文献号: 127852 DOI: 10.1016/j.colsurfa.2021.127852 子辑: 2 出版年: JAN 20 2022
摘要: The relatively high cost, long synthesis duration and low adsorption capacity have limited the application of the primary metal-organic frameworks (MOFs) in the heavy metal removal. Herein, one-minute synthesized primary HKUST-1 MOF with excellent adsorption performance towards Pb2+ has been achieved. The adsorption equi-librium time and maximum uptake capacity of Pb2+ on HKUST-1were 60 min and 819.28 mg/g, respectively. Besides, HKUST-1 exhibited a stronger binding affinity to Pb2+ than the coexisting ions. The adsorption data fitted well with the pseudo-second order model (R-2 = 0.9962) and Langmuir model (R-2 = 0.9919), suggesting the adsorption behavior was dominated by monolayer chemisorption. Further, the destruction of HKUST-1 crystal structure after Pb2+ exposure and strong correlation between the released Cu2+ and adsorbed Pb2+ collectively confirmed the ion exchange could be the potential mechanism. Besides, the coordination interaction between Pb2+ and the free-standing carboxylate groups in the ligands of HKUST-1 also played an important role in the adsorption process. This work not only provides a new idea for Pb2+ removal by primary MOFs based on cation substitution, but also has great implications for constructing green and low-cost MOFs for the treatment of heavy metals contaminated water.
作者关键词: One-minute synthesis; HKUST-1; Pb2+ adsorption; Adsorption mechanism
地址: [Wang, Yan; Li, Mengwei; Hu, Jing; Feng, Wenpei; Li, Junjun; You, Zhixiong] Wuhan Univ, Sch Resources & Environm Sci, Wuhan 430079, Peoples R China.
通讯作者地址: You, ZX (通讯作者)，Wuhan Univ, Sch Resources & Environm Sci, Wuhan 430079, Peoples R China.
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