Zn-based metal organic framework-covalent organic framework composites for trace lead extraction and fluorescence detection of TNP

Wei-Tao Li; Zheng-Jie Hu; Jie Meng; Xuan Zhang; Wei Gao; Ming-Li Chen; Jian-Hua Wang

doi:10.1016/j.jhazmat.2020.125021

Zn-based metal organic framework-covalent organic framework composites for trace lead extraction and fluorescence detection of TNP

J Hazard Mater. 2021 Jun 5:411:125021. doi: 10.1016/j.jhazmat.2020.125021. Epub 2021 Jan 2.

Authors

Wei-Tao Li¹, Zheng-Jie Hu¹, Jie Meng¹, Xuan Zhang¹, Wei Gao¹, Ming-Li Chen², Jian-Hua Wang³

Affiliations

¹ Research Center for Analytical Sciences, Department of Chemistry, College of Sciences, Northeastern University, P.O. Box 332, Shenyang 110819, China.
² Research Center for Analytical Sciences, Department of Chemistry, College of Sciences, Northeastern University, P.O. Box 332, Shenyang 110819, China; Analytical and Testing Center, Northeastern University, P.O. Box 106, Shenyang 110819, China. Electronic address: chenml@mail.neu.edu.cn.
³ Research Center for Analytical Sciences, Department of Chemistry, College of Sciences, Northeastern University, P.O. Box 332, Shenyang 110819, China. Electronic address: jianhuajrz@mail.neu.edu.cn.

PMID: 33476910
DOI: 10.1016/j.jhazmat.2020.125021

Abstract

A novel dual functional composite (MOF_L-TpBD) was prepared through solvothermal methods, with excellent Pb²⁺ ions separation and stable 2,4,6-Trinitrophenol (TNP) fluorescence detection performance. MOF_L-TpBD was characterized by FTIR, XRD, XPS, SEM and TGA et al. The prepared material was used to extract Pb²⁺ ions, with an adsorption capacity of 21.74 mg g^-1 calculated by Langmuir isotherm model. The limit of detection was 0.32 μg L^-1, along with a linear range from 0.7 to 12 μg L^-1 and a precision of 5.4% (1 μg L^-1, n = 9), respectively, where MOF_L-TpBD was adopted as adsorbent for Pb²⁺ ions preconcentration. The practical samples and reference water sample were measured by the provided method, with the satisfactory recoveries (91-110%) and reliable analytical results. MOF_L-TpBD was capable of fluorescent sensing of TNP, with a linear range from 0.01 to 1 mM and a limit of detection of 3.52 μM, respectively, and a precision of 3.29% was obtained (0.2 mM, n = 11). Meanwhile, the recoveries ranged from 91% to 108% in analysis of TNP for the practical samples. The designed material provided a potential candidate material for the detection of heavy metal ions and explosives in environmental water samples.

Keywords: Covalent organic framework; Metal organic framework; Pb(2+) ions detection; Solid phase extraction; TNP detection.

Publication types

Research Support, Non-U.S. Gov't