ZIF-67 derived hollow nanomaterials as solid phase microextraction coatings for rapid capture of polycyclic aromatic hydrocarbons from water samples

Abstract

Zeolitic imidazole framework-67 derived hollow nanomaterials were prepared by etching technique and used as solid-phase microextraction coating, which provided a new, effective and low-cost method for the rapid capture of PAHs from real samples.

Construction of Hollow Cobalt Tetroxide Nanocages through the Metal Salt Bifunctional Etching Strategy for Catalytic Oxidation of Propane at Ultrahigh Space Velocity

“…In Figure 5c, the peaks of pyridine nitrogen and pyrrole nitrogen were located at ∼399.3 and ∼400.5 eV, respectively. 36,39 The ratio of pyridine nitrogen to pyrrole nitrogen on Co 3 O 4 -O was 0.64. After different levels of etching, the ratios of Co 3 O 4 −10, Co 3 O 4 −20, Co 3 O 4 −30, and Co 3 O 4 −40 were all slightly greater than 1.00.…”

“…The ZIF-67 was synthesized based on the method previously reported . Typically, 0.291 g of Co­(NO 3 ) 2 ·6H 2 O and 0.328 g 2-methylimidazole were dissolved in 25 mL of methanol.…”

“…The ZIF-67 was synthesized based on the method previously reported. 39 Typically, 0.291 g of Co(NO 3 ) 2 • 6H 2 O and 0.328 g 2-methylimidazole were dissolved in 25 mL of methanol. The two abovementioned solutions were mixed together and stirred vigorously for 30 min and then aged at room temperature for 24 h. The purple precipitate was centrifuged at 6000 rpm and washed with methanol three times.…”

“…prepared ZIF-67-derived hollow nanomaterials (HO-ZIF-67) by an etching technique of tannic acid and the HO-ZIF-67 was employed to capture polycyclic aromatic hydrocarbons from the real water samples. 39 Cai et al studied the structural and compositional distinctions between each crystallographic facet of truncated rhombic dodecahedrons ZIF-67 (tZIF-67RDs) and the etching effects of cyanuric acid (CA) in the synthesis of hollow ZIFs. 32 In addition to the use of organic acids as etching agents, there were other research studies using other etching agents to prepare ZIFderived hollow cage nanomaterials.…”

Latest Improvements and Expanding Applications of Solid-Phase Microextraction

“…In the past two years, some reported coating materials have possessed more beautiful and unique microstructures, such as core–shell and hollow structures , and flower-like and helical morphologies. − In addition, the spherical morphology is still the most common, which is generally uniform. , Although these fascinating microstructures have been designed and presented in reported works, there is still a lack of explanation regarding the effects of morphology on the enrichment performance. This needs to be further explored.…”