A highly sensitive and selective on–off fluorescent sensor based on a complex of polySchiff-Fe<sup>2+</sup> for Cr(<scp>vi</scp>) detection in an aqueous medium

Here, we developed a facile one-pot strategy for the fabrication of fluorescent aminoclay (F-AC) through in situ solvothermal treatment of 3-aminopropyltrimethoxysilane, MgCl 2 , and sodium ascorbate at 180 C for 6 h. The obtained F-AC exhibited blue emission, good water solubility, and satisfactory photostability. It was observed that Cr 2 O 7 2À could selectively quench the fluorescence of F-AC through the inner filter effect and static quenching process.As a result, a novel fluorescent F-AC-based nanosensor was constructed with good linearity in the range 0.1-75 μM. The nanosensor was successfully applied in real water samples with satisfactory results. This work not only provides a novel nanosensor for Cr 2 O 7 2À , but also highlights the F-AC's promising applications in wider fields due to the versatility and simplicity of the preparation strategy.applications, Cr 2 O 7 2À , fluorescent aminoclay, fluorescent detection, one-pot synthesis | INTRODUCTIONHexavalent chromium (Cr(VI)) is widely used in many fields including electroplating, organic synthesis, leather tanning, textile dying, printing, steel manufacturing, etc. [1][2][3] However, Cr(VI) exhibits highly harmful, teratogenic, and potentially carcinogenic effects on living systems. Low concentrations of Cr(VI) may contribute to kidney failure and rhinitis. [4] The long-term intake of Cr(VI) can damage the DNA of organisms and induce lung adenocarcinoma, respiratory system damage, genetic defects, and so on. [5,6] Importantly, Cr(VI) in water or soil can be enriched in crops and the human body via the food chain, directly or indirectly leading to dangerous effects on human health and the environment. [7] Therefore, the detection of Cr(VI) is of great significance.To date, various approaches have been developed for sensing Cr(VI), [3] such as atomic absorption spectrum, [8] inductively coupled plasma mass spectrum (ICP-MS), [9] electrochemical methods, [10,11] ion chromatography, [12] colorimetry, [13] fluorescence, [6,14] and so on. Among these detection strategies, these traditional instrumental methods suffer from complicated operation and high costs. In contrast, optical methods including colorimetry and fluorescence provide simple, facile approaches for sensing Cr(VI) due to their simple operation and fast response. We prepared yellow-emissive nitrogen and boron-doped carbon quantum dots, and the prepared carbon quantum dots were successfully applied for fluorescence detection of Cr(VI). [6] Chen and co-workers presented a fluorescence enhancement method for sensing Cr(VI) using N-and S-doped carbon dots. [14] Tannic acid-stabilized fluorescent copper nanoclusters have been synthesized for fluorescence turn-off detection of Cr(VI) with a linear range 0.03-60 μM. [15] These methods provide promising paths for sensing Cr(VI). However, novel detection systems for sensing Cr(VI) are still required.Fluorescent aminoclay (F-AC) is a new type of fluorescent nanomaterial that has attracted considerable attention due to its unique optical properties, easy f...

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“…As displayed in Table S1, the proposed approach exhibited a wide linear range. [14,[46][47][48][49][50][51] 3. FRET quenching mechanism.…”

Section: Ph Effects On the Fluorescence Intensity Of F-acmentioning

confidence: 99%

Facile one‐pot synthesis of fluorescent aminoclay and the applications for fluorescence sensing Cr₂O₇²⁻

Guo

Shi

et al. 2022

Luminescence

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“…30 Similarly, many Schiff bases have also been reported in the literature for the fluorescence detection of Cr(VI). [31][32][33][34] Nanogold-functionalized poly(amidoamine) has been decorated with enzyme-tyramine concatemers and used for the detection of Hg 2+ ions with a low LOD of 0.4 pM. 35 A fluorometric bioanalysis sensing system for Hg 2+ was developed using ultrathin 2-D MXenes as fluorescence quenchers in a probe containing Hg 2+ induced exonuclease III (Exo-III).…”

Section: Introductionmentioning

confidence: 99%

Simple fluorochromic detection of chromium with ascorbic acid functionalized luminescent Bio-MOF-1

Kaur,

Sharma,

Bhardwaj

et al. 2024

Nanoscale

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“…[24][25][26][27] Highly sensitive and selective colorimetric sensing methods have been developed for detecting Cr(VI). [28][29][30][31] For example, Zheng' group used singleatom Fe catalysts (SA-Fe/NG) as peroxidase mimetic, TMB as color agent, and 8-hydroxyquinoline (8-HQ) as color inhibitor, established a novel colorimetric detection method. [32] However, its practical application was limited by the complicated synthesis procedure of SA-Fe/NG.…”

Section: Introductionmentioning

confidence: 99%

Iron‐Porphyrin‐Based Covalent Assembly with Peroxidase‐Like Activity and High Efficiency for Cr(VI) Colorimetric Detection

Zang

et al. 2023

Macro Chemistry & Physics

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Efficient synthesis of functional nanomaterials for simple, sensitive, and accurate colorimetric detection of chromate [Cr(VI)] has attracted great interest due to the toxicity of Cr(VI). Here, novel covalently assembled iron porphyrins (CAIPs) are fabricated through covalently cross-linking reaction between iron-tetra-(4-hydroxy-phenyl) porphyrin and three different cross-linkers based on 3,3´-dithiodipropionic acid. The results show that CAIPs have a spherical vesicle framework with favorable dimensional structure and enzymatic activity. In the presence of H 2 O 2 , CAIPs exhibit high peroxidase-like activity toward 3,3´,5,5´-tetramethylbenzidine. Based on these findings, CAIPs are used as an efficient colorimetric catalyst for the sensitive and selective detection of Cr(VI) with a detection limit about 23 nm.The feasibility of this method for real-water samples is verified by a standard addition experiment. This system further facilitates the developments of nanomaterial, and its application in colorimetric detection fields.

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A highly sensitive and selective on–off fluorescent sensor based on a complex of polySchiff-Fe²⁺ for Cr(vi) detection in an aqueous medium

Abstract: Designing exceptional probes to detect minute quantities of chromium(vi) is of huge importance for the safety and health of the human race.

Cited by 8 publications

References 36 publications

Facile one‐pot synthesis of fluorescent aminoclay and the applications for fluorescence sensing Cr₂O₇²⁻

Facile one‐pot synthesis of fluorescent aminoclay and the applications for fluorescence sensing Cr₂O₇²⁻

Simple fluorochromic detection of chromium with ascorbic acid functionalized luminescent Bio-MOF-1

Iron‐Porphyrin‐Based Covalent Assembly with Peroxidase‐Like Activity and High Efficiency for Cr(VI) Colorimetric Detection

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A highly sensitive and selective on–off fluorescent sensor based on a complex of polySchiff-Fe2+ for Cr(vi) detection in an aqueous medium

Abstract: Designing exceptional probes to detect minute quantities of chromium(vi) is of huge importance for the safety and health of the human race.

Cited by 8 publications

References 36 publications

Facile one‐pot synthesis of fluorescent aminoclay and the applications for fluorescence sensing Cr2O72−

Facile one‐pot synthesis of fluorescent aminoclay and the applications for fluorescence sensing Cr2O72−

Simple fluorochromic detection of chromium with ascorbic acid functionalized luminescent Bio-MOF-1

Iron‐Porphyrin‐Based Covalent Assembly with Peroxidase‐Like Activity and High Efficiency for Cr(VI) Colorimetric Detection

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Product

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A highly sensitive and selective on–off fluorescent sensor based on a complex of polySchiff-Fe²⁺ for Cr(vi) detection in an aqueous medium

Facile one‐pot synthesis of fluorescent aminoclay and the applications for fluorescence sensing Cr₂O₇²⁻

Facile one‐pot synthesis of fluorescent aminoclay and the applications for fluorescence sensing Cr₂O₇²⁻