Pyrene-Based Fluorescent Porous Organic Polymers for Recognition and Detection of Pesticides

Abstract

Eating vegetables with pesticide residues over a long period of time causes serious adverse effects on the human body, such as acute poisoning, chronic poisoning, and endocrine system interference. To achieve the goal of a healthy society, it is an urgent issue to find a simple and effective method to detect organic pesticides. In this work, two fluorescent porous organic polymers, LNU-45 and LNU-47 (abbreviation for Liaoning University), were prepared using π-conjugated dibromopyrene monomer and boronic acid compounds as building units through a Suzuki coupling reaction. Due to the large π-electron delocalization effect, the resulting polymers revealed enhanced fluorescence performance. Significantly, in sharp contrast with the planar π-conjugated polymer framework (LNU-47), the distorted conjugated structure (LNU-45) shows a higher specific surface area and provides a broad interface for analyte interaction, which is helpful to achieve rapid response and detection sensitivity. LNU-45 exhibits strong fluorescence emission at 469 nm after excitation at 365 nm in THF solution, providing strong evidence for its suitability as a luminescent chemosensor for organic pesticides. The fluorescence quenching coefficients of LNU-45 for trifluralin and dicloran were 5710 and 12,000 (LNU-47 sample by ca. 1.98 and 3.38 times), respectively. Therefore, LNU-45 serves as an effective “real-time” sensor for the detection of trifluralin and dicloran with high sensitivity and selectivity.

Decorating Porous Aromatic Framework Cavities with Long‐Chain Alkyl Grippers for Rapid and Selective Iron(III) Detection

“…As shown in Figure S10, the quenching coefficients for the two PAF materials are calculated according to the Stern‐Volmer formula: I 0 /I=K SV [C]+ 1 ( I 0 is the initial fluorescence intensity, I standing for the fluorescence intensity after quenching; K SV is quenching coefficient, and [C] is the molar concentration of analyte) [40–43] . In order to better understand the fluorescence quenching mechanism of materials, we fitted the relative fluorescence intensity of LNU‐22 and LNU‐24 with Fe 3+ concentration.…”

Effective Removal of Nitrogenous Pesticides from Water Using Functionalized Calix[4]arene‐Decorated Magnetite Nanoparticles

“…Various studies have been carried out to develop nanomaterial‐based adsorbents for the removal of pesticides from water. MET and DIC pesticides removal from water has been examined by amino‐functionalized Fe 3 O 4 nanoparticles, [12] magnetic switchgrass biochar(MSGB), [13] coal fly ash, [14] cucumber peel modified with ZnO nanoparticles, [15] dispersive‐micro‐solid phase extraction by dendrimer‐modified MNPs, [16] and pyrene based organic polymer [17] . All reported adsorbents can adsorb pesticides but their specificity and selectivity for nitrogenous pesticides are not optimum.…”

“…MET and DIC pesticides removal from water has been examined by amino-functionalized Fe 3 O 4 nanoparticles, [12] magnetic switchgrass biochar(MSGB), [13] coal fly ash, [14] cucumber peel modified with ZnO nanoparticles, [15] dispersive-micro-solid phase extraction by dendrimer-modified MNPs, [16] and pyrene based organic polymer. [17] All reported adsorbents can adsorb pesticides but their specificity and selectivity for nitrogenous pesticides are not optimum. Therefore, a more customized adsorbent is required to remove nitrogenous pesticides, more particularly DIC and MET from water samples.…”

Can absorbent polymers remove pesticides from environment? A Data Mining study.

“…These materials are pyrene-based, a compound pilicyclic and antiaromatic with four fused benzene rings, with properties (like long fluorescence lifetime and high fluorescence quantum) that classify the pyrene as the most used chromophore. The LNU-45 and LNU-47 have presented effects on trifluralin and dicloran molecules because of the sensitivity by the substance with these compounds (7) .…”