Ions In Environmental Samples Research Articles

Development of an ionic liquid-based microextraction system (ILBME) for sensitive spectrophotometric analysis of neodymium(III) ions in environmental samples

ABSTRACT Introducing a precise, sensitive and simple system for determining neodymium(III) ions in aquatic samples could enhance the capabilities of routine instruments, particularly in terms of detection limits. Coupling a powerful preconcentration system, such as ionic liquid-based microextraction (ILBME), with a spectrophotometer can successfully achieve this goal. A sensitive and simple microextraction method based on a task-specific ionic liquid, designated [PDmim][Cl2], is described, in which the imidazolium-based ionic liquid served dual roles as both the chelating agent and the extraction phase. The ionic liquid was synthesized and characterized before being applied in microextraction procedure. The optimized microextraction results indicate that neodymium concentrations up to 5.10 µg L−1 can be successfully determined. The method characteristics, including the limit of detection (LOD), limit of quantification (LOQ), intra-day and inter-day relative standard deviations (RSDs), preconcentration factor (PF), enrichment factor (EF) and linear dynamic range (LDR), were found to be 1.53 µg L−1, 5.10 µg L−1, 3.83%, 4.44%, 123, 111.1 and 5.0–125.0 µg L−1, respectively. For method validation, the standard addition method using standard reference material (SRM) was employed, and the recovery range from real samples analyses was between 99.3% and 101.0%.

Rapid and accurate identification of multiple metal ions using a bispyrene‐based fluorescent sensor array with aggregation‐induced enhanced emission property

AbstractMultiple metal ions are traditionally detected using inductively coupled plasma mass spectrometry (ICP‐MS) and atomic fluorescence spectrometry. Although these methods are sensitive and accurate, they depend on complex instruments and require highly trained operators, making low costly rapid detection challenging. It is urgent to develop a convenient, rapid and sensitive method to detect multiple metal ions. Herein, we designed a bispyrene derivative (BP) with aggregation‐induced enhanced emission (AIEE) property to construct a high fluorescent sensor array to realize the effective identification of four metal ions (Fe3+, Cu2+, Co2+ and Cd2+). The differential coordination capability between metal ions and BP with the aid of acetate ions resulted the possibility of array‐based sensing. The four heavy metal ions could be immediately classified in the concentration of 100 nM. The limit of detection (LOD) of Fe3+, Cu2+, Co2+, and Cd2+ were as low as 16.2, 21.8, 51.4, and 25.9 nM, respectively. Furthermore, the sensor array was applied for identification multiple heavy metal ions in environmental samples and iron ion in rat serums with identified of 100%. The sample consumption as low as 2 µL for each detection and the results could be extracted by smartphones under ultraviolet lamps. It provided a rapid, sensitive, low‐cost, and on‐site multiple metal ions detection method.

Benzothiazole-quinoline based probe for simultaneous colorimetric detection of CN- and Cu2+ ions, with fluorescence sensing for Cu2+: Mechanistic insights and practical applications in environmental monitoring and cellular analysis

The development and synthesis of notably targeted and colorimetric sensor based on an azomethine compound for the distinct recognition of Cu2+ and CN− ion individually in an aqueous dimethyl formamide solution is performed. In the presence of CN− and Cu2+, the sensor BTZ showed impressive colorimetric changes, going from pale yellow to orange and pale yellow to dark yellow, respectively. In the meantime, FL spectrum (Cu2+) and UV–vis spectroscopy (CN−/Cu2+) were used to assess the sensing features. The plausible binding mechanisms of CN− and Cu2+ ions with sensor BTZ have been studied using the 1H NMR titration, Job's plot and DFT technique. The bathochromic shift produced by the intramolecular charge transfer (ICT) transition may have been the source of the phenomenon. Furthermore, CN− ion in the commercial substance is quickly identified and measured with the naked eye by using sensor BTZ. It was found that the BTZ's LOD for CN− and Cu2+ was 0.280 × 10−7 M and 1.153 × 10−7 M, respectively. Moreover, 1:1 binding ratio for the reaction of CN− and Cu2+ ions with sensor BTZ were demonstrated by Job's plot, which was dependent on analytical data. The findings show that BTZ is an easy-to-use and practical probe for concurrently sensing cyanide and copper ions in environmental samples and living cells that have less cytotoxicity.

An innovative eco-friendly optical sensor designed specifically to detect gallium ions in environmental samples

A novel membrane optical sensor with high selectivity and sensitivity was developed for detecting ultra-low concentrations of gallium (Ga3+) ions. This sensor utilized a newly synthesized compound, 4,4′-1,3-pHenylene bis(azanylyli-dene) bis(methanylylidene))bis(N,N-dimethylaniline) (PBABMBD), as its ionophore, combined with 9-(diethylamino)-5-(octadecanoylimino)-5H-benzo[a] phenoxazine (ETH-5294) as a chromoionophore within a polyvinyl chloride (PVC) membrane matrix. The impact of various parameters on the fabrication of the optical sensor and its ability to detect Ga3+ ions was thoroughly examined and fine-tuned for optimization. Demonstrating a broad linear dynamic range from 6.25 × 10−9 to 3.75 × 10−6 M, the sensor boasts impressive detection and quantification limits of 1.75 and 6.00 × 10−9 M Ga3+ ions, respectively. Furthermore, the sensor demonstrates a swift response time of just 3.0 min and can undergo multiple rejuvenations with 0.25 M HNO3 solutions. The study examined the impact of potential interfering ions on the detection of Ga3+ions. Fortunately, the results showed that the created optical sensor was very selective for Ga3+ ions and barely reacts with other anions and cations, especially indium (III). Furthermore, the sensor proved effective in accurately detecting Ga3+ ions across a range of samples, including food, alloys, water, and biological specimens.

Spectroscopic determination of cobalt(II) ion by using azo dye of triazole derivatives

Highly efficient azo-day triazole derivatives carrying a π bond and OH electron donor groups have been designed, synthesized, and evaluated as colorimetric chemosensors for detecting metal ions in environmental samples, which was further supported by the functional theory studies and UV–Vis spectrophotometric experiment. The 4-amino-5-(2-((2,3-dimethylphenyl)amino)phenyl)-4H-1,2,4-triazole-3-thiol was directed to react with 3-nitrophenol during a diazotization type reaction to form an azo-day 4-((3-(2-((2,3-dimethylphenyl) amino)phenyl)-5-mercapto-4H-1,2,4-triazol-4-yl)diazenyl)-3-nitrophenol (Y), which have been confirmed by FTIR, 1H NMR, and could also be easily used for the detection metal ions. Compound (Y) exhibited a rapid quantitative method for the detection of Co(II) at λmax (532 nm) in an aqueous solution. The current study introduces a facile, low cost, more specific and selective chemosensor for detecting trace amounts of cobalt ions. KEY WORDS: Mefenamic acid, Azo dye, Cobalt(II), Spectroscopy Bull. Chem. Soc. Ethiop. 2024, 38(5), 1557-1567. DOI: https://dx.doi.org/10.4314/bcse.v38i6.5

A Fluorescent Probe Derived from L‐Tryptophan for Copper (II) Ion Detection in Aqueous Media

AbstractCopper (Cu2+) is a transition metal ion extensively distributed in numerous foodstuffs of both animals and vegetables. An excess intake of Cu2+ ions cause injury, pneumonitis, a disorder in the nervous system, and gastrointestinal problems. Hence, we have developed a simple and novel Schiff base‐based fluorescence sensor for the detection of Cu2+ ions. The sensor, ‐3‐(1H‐indol‐3‐yl)‐2‐((4‐nitrobenzylidene) amino)propanoic acid (INAP), was synthesized from tryptophan and nitrobenzaldehyde by the reflux method and characterized by various analytical methods. The prepared INAP acted as a chemical sensor and displayed outstanding sensitivity and choosiness characteristics for Cu2+ ions an aqueous solvent. In the presence of Cu2+, it demonstrated a fluorescence change in an aqueous medium with a “turn‐off” phenomenon via complex‐mediated energy transfer characteristics, and the method of continuous variation suggested a 1 : 2 complex formation of the metal ion with INAP. The LOD of the sensor system was calculated to be 1.3 μM for the Cu2+ ion. In addition, the INAP fluorescent probe was applied to tap water samples and found acceptable recoveries. These results suggest that the newly fabricated sensor system would be explored as a chemosensor for the recognition of Cu2+ ions in environmental samples.

Synthesis of orange emissive poly(o-phenylene diamine) nanoparticles and its application for solvents, pH and Ag+ sensing

pH plays many essential functions in living organism while silver find applications in day to day life. However abnormal pH and improper dumping of silver ions can be lethal for living being. Herein, an orange emissive ploymer nanoparticles (OPNP) is synthesized by oxidative method at room temperature using 1, 2 diaminobenzene and potassium peroxodisulfate.The as obtained OPNP is characterized by TEM, FESEM, PXRD, FT-IR, EDX, UV–visible and fluorescence spectroscopy. The fluorescence of the obtained OPNP is highly sensitive to solvents, pH and Ag+ ions. The fluorescent color of the OPNP is tuned from orange to bluish green (560–485 nm) by adjusting the polarity of the solvents. The fluorescence intensity of OPNP increases as the pH is increased from acidic (pH-2) to basic medium (pH-12). The fluorescence of the OPNP is quenched by Ag+ ions, hence it is employed for selective detection of Ag+ ions both in solid and aqueous phase. The calibration plot for Ag+ is linear in the 0–30 μM concentration ranges and its limit of detection is 0.398 μM, which is lower than the permitted limit of WHO. Furthermore, the fluorescent OPNP is explore for determination of Ag+ ion in environmental samples with good recoveries ranging from 95.83 to 103 %.

Selective Sensing and Determination of Cu2+ Ions in Environmental Samples with Newly Prepared Quinoline based Chemosensors and Confirmation of Results using DFT Molecular Modelling

Selective Sensing and Determination of Cu2+ Ions in Environmental Samples with Newly Prepared Quinoline based Chemosensors and Confirmation of Results using DFT Molecular Modelling

Quinoxaline-linked N-acyl hydrazine: A “turn-off” fluorescent probe for the selective recognition of Fe3+ in real water samples

Quinoxaline-based novel (E/Z)-2-(12H-benzo[5,6][1,4]thiazino[2,3-b]quinoxalin-12-yl)-N’-(4-fluorobenzylidene)acetohydrazide (BTQAH) based fluorescent probe was synthesised and characterised using FT-IR, mass spectrometry, NMR spectroscopic techniques. The developed probe revealed a “turn-off” response against Fe3+ ion with no interference from other competing ions as revealed from spectral analysis. The probe offers a limit of detection (LOD) as low as 3.39 µM, which is less than that of the guidelines issued by WHO and US-EPA. A binding stoichiometry of 1:1 was observed in a Fe3+:BTQAH complex as revealed by Job’s plot analysis. A binding constant of 1.13 x 106 M−1 was calculated by the Benesi-Hilderbrand equation. The sensing application of the developed probe (BTQAH) was also extended to the real time analysis of Fe3+ ion in environmental samples. The present approach offers several advantages in terms of rapid, precise, and sensitive analysis of Fe3+ ions.

Gold nanoparticles decorated magnetic nanozyme for colorimetric detection of mercury (II) ions via enhanced peroxidase-like activity

Mercury is one of the heavy metal ions that are released to the environment through various means including anthropogenic pollution. A very low dose of mercury in environmental systems such as water can lead to debilitating effects on the health of humans and animals, if consumed untreated. To reduce this effect, it is critical to develop a simple, non-expensive, and non-sophisticated detection and monitoring system of mercury. Here, we report a simple colorimetric method based on the peroxidase-like activity of AuNPs/ZnO/Fe3O4. Different characterization techniques such as scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), and surface-enhanced Raman spectroscopy (SERS) were used to investigate the successful formation of these composites. The formation of AuNPs was assisted by ZnO. The low Km value (0.7368 mM) obtained from the kinetic study of the catalytic oxidation of 3, 3′, 5, 5′ − Tetramethylbenzidine (TMB) showed strong affinity of TMB to AgNPs/ZnO/Fe3O4. The peroxidase-like activity of AgNPs/ZnO/Fe3O4, was further enhanced in the presence of mercury (II). The absorption intensities of the resulting oxidized TMB (oxTMB) increased linearly in a concentration range of 0.05 – 20 µM. The method also exhibited high selectivity to mercury (II) ions. The limit of detection (LOD) in this linear range was found to be 28.1 nM. The feasibility of the method in determination of mercury (II) ions from real samples was confirmed from high recovery rates in tap water samples. The method shows a great potential for determination of mercury (II) ions in environmental samples.

Harnessing photocurrent enhancement in silver-bacterial cellulose nanocomposite for ultra-sensitive Hg2+ electrochemical detection

Global health and ecosystem concerns over mercury pollution require stringent monitoring. Herein, we showcase a novel approach for detecting trace Hg2+ ions in water using cyclic voltammetry (CV). Our approach involves modifying glassy carbon electrode (GCE) and screen printed electrode (SPE) surfaces with a nanocomposite of ascorbic acid-capped silver nanoparticles (AsAgNPs) embedded in nanocrystalline bacterial cellulose (AsAgNP-NBC). Analytical techniques confirmed the nanocomposite’s stability and morphological characteristics, exhibiting high accuracy within a linear range of 10 nM to 1 µM Hg2+ and a low limit of detection (LOD) of 3.531 nM. Additionally, on irradiation with 455 nm light source, AsAgNP-NBC modified SPE displayed a remarkable 9.6 times enhanced photocurrent, achieving an LOD of 3.95 pM, and enhanced photoresponsivity of 55.2 mA W−1, showcasing its potential for ultra-trace level detection. This cost-effective and biocompatible nanocomposite presents a promising alternative to conventional analytical methods for selective detection of trace Hg2+ ions in environmental samples.

Eco-friendly synthesis of nanoceria using orange peel extract for electrochemical detection of selective cadmium ions

Contamination of drinking water and food by cadmium ions (Cd2+) is a major threat to human health and environment. Here, we focus on the fabrication of simple, cost effective, eco-friendly synthesis of Cerium oxide nanoparticles (nanoceria) using orange peel extract for selective detection of cadmium (Cd2+) ions. The green synthesized nanoparticles exhibited cubic structure which was confirmed by XRD studies. The FESEM and EDS image confirm the surface morphology and elemental composition of nanoceria. HRTEM possesses the cubic structure with an average particle size of 17 nm. The green synthesized nanoceria shows a strong absorption Raman spectrum at 465 cm−1. Furthermore, the Electrochemical profile of nanoceria was investigated by cyclic voltammetry and electrochemical impedance spectroscopy. The electroactive surface area recorded for CeO2 modified GCE is 13.24 cm2. The nanoceria modified Glassy carbon electrode (GCE) was used for the detection of toxic heavy metal Cd2+ ion with square wave voltammetry. The linear detection range of Cd2+ was from 10 µM to 1000 µM. The fabricated green synthesized CeO2 electrode exhibited a linear behaviour and the detection limit was found to be 0.47 nM exhibited excellent stability. The green synthesized CeO2 can also be used in trace detection of Cd2+ ions in environmental samples. The nanoceria synthesized via orange peel extract has high electrochemical performance would be of great interest for constructing novel sensing platforms for monitoring heavy metal ions (Cd2+) in environment.

A new oligo(N,O-donor)-like ratiometric fluorescent probe with FRET effect for dual-channel recognition of B4O72- ions in practical water samples

B4O72- ions are widely found in various production and living environments, and can cause serious effects on human health. For this reason, it is necessary to develop a high-efficiency method for the detection of B4O72- ions. Here a oligo(N,O-donor)-like dual-channel ratiometric fluorescence probe H3L was designed and synthesized for the detection of B4O72- ions in environmental samples. The recognition of B4O72- is based on the FRET effect by the probe H3L, the naphthalene ring partially serves as an energy donor, benzene ring partially serves as an energy acceptor, and phenolic oxygen acts as a reaction site for B4O72-. The probe H3L mainly displays the blue fluorescence of the donor; the presence of the B4O72- ions turns on the FRET effect, which will lead to yellow fluorescence of the benzene ring acceptor, enabling a ratiometric fluorescence recognition process. The probe has a large Stokes red shift (Δλ = 123 nm), which makes the emission wavelength after red shift more than 500 nm, and the obvious colourless to yellow color change can be observed by naked eyes, which solves the background fluorescence interference problem of short-wavelength fluorescence probe. At the same time, the probe has high selectivity and high sensitivity (low detection limit of 17.3 nM). In addition, we have successfully used this probe to detect B4O72- ions in actual samples. These results showed that the probe has a broad application prospect.

Fluorescent multichannel sensor array based on three carbon dots derived from Tibetan medicine waste for the quantification and discrimination of multiple heavy metal ions in water.

Afluorescent multichannel sensor array has been establishedbased on three carbon dots derived from Tibetan medicine waste for rapid quantification and discrimination of six heavy metal ions. Due to the chelation between metal ions and carbon dots (CDs), this fluorescence "turn off" mode sensing array can quantify six metal ions as low as "μM" level. Moreover, the six heavy metal ions display varying quenching effects on these three CDs owing to diverse chelating abilities between each other, producing differential fluorescent signals for three sensing channels, which can be plotted as specific fingerprints and converted into intuitive identification profiles via principal component analysis (PCA) and hierarchical cluster analysis (HCA) technologies to accurately distinguish Cu2+, Fe3+, Mn2+, Ag+, Ce4+, and Ni2+ with the minimum differentiated concentration of 5μM. Valuably, this sensing array unveils good sensitivity, exceptional selectivity, ideal stability, and excellent anti-interference ability for both mixed standards and actual samples. Our contribution provides a novel approach for simultaneous determination of multiple heavy metal ions in environmental samples, and it will inspire the development of other advanced optical sensing array for simultaneous quantification and discrimination of multiple targets.

Rationally designed dual channel reversible probe for cyanide recognition in aqueous medium with solid-state sensing abilities

A novel chromogenic azo-azomethine chemosensor, namely 2-((E)-(2-(benzo[d]thiazol-2-yl) hydrazineylidene)methyl)-4-((E)-phenyldiazenyl)phenol (referred to as L), was rationally designed and synthesized. The molecular structure of L was established using various spectroscopic and spectrometry techniques including NMR, FT-IR and mass. The spectral profile including absorption and fluorescence were recorded in solvents of varying polarity. The sensor responsiveness towards different anions was evaluated visually and established using UV–vis spectroscopy and NMR studies. A binary solution of DMSO/H2O (6:4, v:v) was used for anion recognition studies. A color change from colorless to yellow was noticed upon addition of CN– ion to the probe (L) solution. The developed probe was found to be very sensitive towards CN– ion with a detection limit of 21 nM. Benesi-Hildebrand plot revealed a binding constant of 1.2*103 M-2and the binding stoichiometry of 1:2 was confirmed using Job’s plot. 1H NMR studies were utilised to ascertain the recognition mechanism which revealed the CN– ion assisted deprotonation of N-H and O-H group of L. The recognition mechanism established using NMR technique has been supported theoretically by DFT based studies. Additionally, cost-effective paper strips coated with L has been proved to be a convenient tool for detecting CN– ion in aqueous solutions. The reversibility and reusability of the developed probe was also investigated in both solution as well as solid state using trifluoroacetic acid (TFA) without any loss of the sensitivity of the developed probe. Moreover, the developed probe recognises cyanide ion in environmental samples with around 100 % recovery. The practical application of the Logic gate response of L was confirmed by paper strip experiment.

Dual detection of Hg2+ and Pb2+ by a coumarin-functionalized Schiff base in environmental and biosystems

Fluorescent chemosensors are often preferred for tracking toxic ions because of their non-destructive measurement and ease of use in environmental real samples and biosystems. Exploring high selectivity, great sensitivity, and biocompatible fluorophores with facile, accessible and dual-responsive features is currently highly demanding. A coumarin-based naphthol hydrazone Schiff base chemosensor, NaChro, is designed and synthesized in a two-step process to detect toxic metal ions with strong emission. Fluorescence spectra analysis demonstrates that the probe binds to Hg2+ and Pb2+ ions with a 1:1 and a 2:1 stoichiometry, respectively, with high sensitivity, short response time and minimal interference from other metal ions. The observed reversible turn-on reaction was attributed to the inhibition of C = N isomerization and excited-state intramolecular proton transfer (ESIPT) processes once the ions were introduced. The practical applications of NaChro are successfully addressed in paper strips, various water samples, HeLa cells and Zebrafish, demonstrating that the probe can detect and track Hg2+ and Pb2+ ions in environmental samples and biosystems.

Synthesis and Application of 3-[3-Phenylpyrazylazo]-2,7-Naphthalendiol for Improved Palladium Determination in Environmental Samples and Enhanced ZnO Nanoparticle Performance

In this study, a spectrophotometric method for the determination of low levels of palladium (II) was developed by forming a complex with the new reagent 3-(3-phenyl pyrazyl azo)-2,7-naphthalendiol (3PPAN). The complex showed maximum absorption at 612 nm with a maximum molar absorptivity of 4.911?104 L/mol/cm, and a linear correlation was established between absorbance and concentration. The accuracy and repeatability of the method were evaluated and found to be precise (RSD 1.22%) and accurate (relative error 0.157%). The method?s selectivity was also tested by evaluating the effect of various ions. The stability constant of the complex was determined to be 2.759?107 L/mol. The method was successfully applied to the determination of Pd (II) ions in environmental samples of water and soil. In addition, the new ligand (3PPAN) was used to improve the properties of nano ZnO through a ligand exchange reaction on nanoparticles.. KEYWORDS :Azo, Palladium, Spectrophotometric, ZnO nanoparticles.

Zinc nitride quantum dots as an efficient probe for simultaneous fluorescence detection of Cu2+ and Mn2+ ions in water samples.

The exceptional ascending heights of graphene (carbon) and boron nitride nanostructures have invited scientists to explore metal nitride nanomaterials. Herein, Zn3N2 quantum dots (QDs) were prepared via a simple hydrothermal route from the reaction between zinc nitrate hexahydrate and ammonia solution that possess efficient strength towards sensing applications of metal ions (Cu2+ and Mn2+). The as-prepared Zn3N2 QDs show bright fluorescence, displaying an emission peak at 408nm upon excitation at 320nm, with a quantum yield (QY) of 29.56%. It was noticed that the fluorescence intensity of Zn3N2 QDs linearly decreases with the independent addition of Cu2+ and Mn2+ ions, displaying good linearity in the ranges 2.5-50µM and 0.05-5µM with detection limits of 21.77nM and of 63.82nM for Cu2+ and Mn2+ ions, respectively. Theprobe was successfully tested for quantifying Cu2+ and Mn2+ in real samples including river, canal, and tap water, providinggood recoveries with a relative standard deviation < 2%. Furthermore, the masking proposition can successfully eliminate the interference if the twometal ions exist together. It was found that thiourea is efficiently able to mask Cu2+ and selectively quenches Mn2+, and L-cysteine is able to halt the quenching potential of Mn2+ and is selectively able to sense Cu2+. The Zn3N2 QDs provide a simple way for the simultaneous detection of both Cu2+ and Mn2+ ions in environmental samples at lowsample preparationsrequirements.

New solid state contact potentiometric sensor based on a thiosemicarbazone derivative molecule for determination of copper(II) ions in environmental samples

Thiosemicarbazone derivative molecules have proven to be good sensor materials in studies using various analytical methods. In this study, new ion–selective sensors were prepared using 2–furaldehyde thiosemicarbazone and their potentiometric properties were then tested. The prepared sensors exhibited a very good selectivity towards copper(II) ions over various ions. Surface images and mappings of the prepared sensors were examined by scanning electron microscopy. Copper(II)–selective sensors had a Nernstian response of 28.5 ± 1.5 mV/decade, and a low detection limit of 6.89 × 10-6 mol L-1 over a wide concentration range of 1.0 × 10-5–1.0 × 10-1 mol L-1 (R2 = 0.9992). The newly prepared copper(II)–selective sensors were shown to be produced reproducibly, stable and economically. The sensors, which can operate in a wide pH range of 5.0–9.0 without being affected by pH changes, had a fast response time of 5 s. The newly developed copper(II)–selective sensors were used as indicator electrodes for the potentiometric titration of copper(II) ions with ethylenediaminetetraacetic acid and were successfully applied for the determination of copper(II) ion content in various environmental samples with very good performance. The data obtained with the developed sensor were compared with atomic absorption spectroscopy and it was determined that the results of both methods were compatible with each other.

Extraction and detection of mercury in electronic waste using efficient modified MOF

The harmful effects of heavy metal ions on human health and the ecosystem have made the detection of these ions in environmental samples increasingly important in recent years. There has been significant attention on the development of sensors that are selective and sensitive in detecting heavy metal ions. Due to their wide presence in the environment and high toxicity, the detection of Hg2+ ions is of great interest. MIL-101(Al)-N = 2NAPHT (2NAPHT = 3-hydroxy-2-naphthaldehyde, N = imine nitrogen) is a novel chemosensor that was solvothermally synthesized and characterized. A limit of detection of 5.48 ppb (2.73 ×10−8 M) was found for the chemosensor, which is highly selective and sensitive to Hg2+ ion detection. The fluorescence emission properties of MIL-101(Al)-NH2 were improved and more binding sites for analytes were introduced after functionalization with 2-hydroxy naphthaldehyde. The formation of the novel chemosensor was confirmed by using Fourier-transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), TEM, SEM, thermogravimetric analysis (TGA), and X-ray diffraction (XRD). Moreover, this chemosensor showcased a regenerative emission feature, retaining its detection ability for six successive cycles. The study revealed that the sorbent had a considerable Hg2+ capacity, amounting to 133.2 mg per gram of MIL-101(Al)-N = 2NAPHT chemosensor. The chemosensor MIL-101(Al)-N = 2NAPHT was also assessed for its capability to identify Hg2+ ions in electronic waste samples (silver oxide button cells). According to the results mentioned above, the chemosensor exhibited a high degree of sensitivity and selectivity towards Hg2+ ions. The MIL-101(Al)-N = 2NAPHT chemosensor is an effective and promising technology for the detection and removal of mercury from electronic waste, in conclusion.