[In-situ solvothermal polymerization of metal-organic framework/carbon-nitrogen nanosheet-coated solid-phase microextraction fiber for highly sensitive detection of pesticide residues in black tea].

Pyrethroids (PYs) and organochlorine pesticides (OCPs) are widely used to control pests and diseases in plants; however, they threaten human health. In this study, a metal-organic framework/carbon-nitrogen nanosheet composite nanomaterial (UiO-66/HOCN)-coated solid-phase microextraction (SPME) fiber was prepared by in-situ thermal polymerization. The prepared UiO-66/HOCN composite material was characterized by transmission electron microscopy, X-ray diffraction, nitrogen adsorption porosimetry, thermogravimetric analysis, and zeta potentiometry.

Graphitic carbon nitride derivative with large mesopores as sorbent for solid-phase microextraction of polycyclic aromatic hydrocarbons.

Although an efficient and stable fiber coating is essential for the development of the solid-phase microextraction (SPME) technique, it remains a challenging prospect. We report herein the construction of graphitic carbon nitride derivative (g-CN-d) nanosheets having a large surface area, large mesopores (3.15 and 36.

Chemical bonding of oxygenated carbon nitride nanosheets onto stainless steel fiber for solid-phase microextraction of phthalic acid esters.

In this work, oxygenated carbon nitride nanosheets (OCNNSs) were first introduced to the field of analytic chemistry for solid-phase microextraction (SPME). The rich hydroxyl and carboxyl contents of OCNNSs provided abundant adsorption sites. The coated stainless steel fibers, synthesized by the layer-by-layer chemical bonding method, had good chemical stability (in organic solvents), long life (durability ≥ 150 cycles), and good reproducibility (RSDs ≤ 9.

Metal-organic framework-coated stainless steel fiber for solid-phase microextraction of polychlorinated biphenyls.

For solid phase microextraction (SPME), effective immobilization of sorbent on a stainless steel fiber surface is very essential. But, it still remains challenging because the chemical inertness of stainless steel fiber. In this work, chemical bonding method was introduced to fabricate a series of metal-organic frameworks (MOFs)-coated stainless steel fibers, and some representative MOFs (ZIF-90 (Zn), MOF-199 (Cu), MIL-101 (Cr), MOF-5 (Zn))-coated stainless steel fibers were successfully synthesized.

Moisture stable Ni-Zn MOF/g-CN nanoflowers: A highly efficient adsorbent for solid-phase microextraction of PAHs.

Volatile polycyclic aromatic hydrocarbons (PAHs) in water and soil are associated with status in the human body. Development of simple, efficient detection method is challenging due to the coating could be attacked by the abundance of water in the direct-immersion solid-phase microextraction. The stability of coating is essential to the analysis results.