Home-made multifunctional auxiliary device for in-situ imaging detection and removal of quinclorac residues through MOF decorated gel refills

Pesticides bring a rich crop production for the agriculture, while also cause many controversies about the potential problems about overuse. Portable devices possessing detection and decontamination of pesticide residues present in the environment are badly needed to the safety of public health. Herein, two novel two-dimensional (2D) zinc-based organic frameworks (Zn-MOFs), {Zn(Htbia)(2)center dot H2O}(n) (Zn1) and {[Zn(tbia)center dot H2O]center dot H2O}(n) (Zn2), have been successfully prepared based on a asymmetric flexible ligand 5-((4' -(triazol-1-yl)benzyl)oxy)isophthalic acid (H(2)tbia). The twist of -CH2- and -O- centers endow double layer structure Zn2 high stability and abound open metal sites. Eco-friendly and recoverable Zn2@ZIF-8@SA gels were fabricated by in-situ growing Zn-MOFs onto sodium alginate substrates and employed for fluorescent detecting and removing pesticides from the environment simultaneously, which exhibit a low limit of detection (LOD) of quinclorac (QNC), 2,6-dichloro-4-nitroaniline (DCN), thiabendazole (TBZ) are 0.08 mu M, 0.09 mu M and 0.37 mu M, respectively and a high removal capacity of QNC about 142.1 mg.g(-1). Furthermore, the integrated detection platform Zn2@ZIF-8@SA is developed into a portable, simple, non-invasive sensor test box for visual detection of pesticide residues on plants and fruits.

Automated summary

Pesticides bring about a higher crop yield but also raise concerns about potential issues from overuse. This study successfully synthesized two novel zinc-based organic frameworks and fabricated eco-friendly and recoverable gels for fluorescent detection and removal of pesticide residues. The integrated detection platform was developed into a portable and non-invasive sensor test box for visual detection of pesticide residues on plants and fruits.