Diaminonaphthalene Functionalized LUS-1 As a Fluorescence Probe for Simultaneous Detection of Hg and Fe in Vetiver Grass and Spinach

Overview

Journal Sci Rep

Specialty Science

Date 2024 Jul 16

PMID 39013906

Authors

Maryam Nouri

Leila Hajiaghababaei

Alireza Badiei

Faezeh Khalilian

Ali Mazloomifar

Affiliations

Soon will be listed here.

Abstract

One of the important problems in the environment is heavy metal pollution, and fluorescence is one of the best methods for their detection due to its sensitivity, selectivity, and relatively rapid and easy operation. In this study, 1,8-diaminonaphthalene functionalized super-stable mesoporous silica (DAN-LUS-1) was synthesized and used as a fluorescence probe to identify Hg and Fe in food samples. The TGA and FT-IR spectra illustrated that 1,8-diaminonaphthalene was grafted into LUS-1. XRD patterns verified that the LUS-1 and functionalized mesoporous silica have a hexagonal symmetrical array of nano-channels. SEM images showed that the rod-like morphology of LUS-1 was preserved in DAN-LUS-1. Also, surface area and pore diameter decreased from 824 m g⁻ and 3.61 nm for the pure LUS-1 to 748 m g⁻ and 3.43 nm for the DAN-LUS-1, as determined by N₂ adsorption-desorption isotherms. This reduction demonstrated that 1,8-diaminonaphthalene immobilized into the pore of LUS-1. The DAN-LUS-1 fluorescence properties as a chemical sensor were studied with a 340/407 nm excitation/emission wavelength that was quenched by Hg and Fe ions. Hg and Fe were quantified using the fluorescence response in the working range 8.25-13.79 × 10 and 3.84-10.71 × 10 mol/L, with detection limits of 8.5 × 10 M and 1.3 × 10 M, respectively. Hg and Fe were measured in vetiver grass and spinach. Since the Fe quenching can move in the opposite direction with sodium hexametaphosphate (SHMP) as a hiding compound for Fe, consequently, the circuit logic system was established with Fe, Hg, and SHMP as inputs and the fluorescent quench as the output.

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