In situ growth of copper-based metal–organic framework nanoarrays on copper wire for solid-phase microextraction of polycyclic aromatic hydrocarbons

Abstract

The present study deals with metal–organic framework substances in three-dimensional oriented design vital for using them in a new type of the fiber coating for solid-phase micro-extraction of polycyclic aromatic hydrocarbons. Cu(OH)2 nano-rod arrays were utilized as a sacrificial template to develop a coordination replication approach to make Cu-based metal–organic frameworks into three-dimensional hierarchical nano-array architectures. The Cu(OH)2 nano-rod arrays served as Cu source coordinating with organic ligand to create MOF crystals and the three-dimensional substrate for supporting the Cu-based metal–organic framework growth. By this strategy, novel possibilities are made to construct immobilized metal–organic framework-based three dimensional nano-arrays for multipurpose usages. Optimum circumstances are a desorption temperature of 260 °C, an extraction temperature of 85 °C, and a salt concentration of 20% w/v. The limit of detection and dynamic linear range are within the range of 2.5–3.4 ngL-1 and 0.01–100 µgL-1, respectively. One fiber’s repeatability (n = 5) is between 5.1 and 8.4%, stated as relative standard deviation. The technique possesses the benefits including simple use, and the fiber’s quick thermal stability, as well as high relative recovery (in comparison with usual approaches), are further attractive properties.