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

Abstract

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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“…These materials could be used for unwanted signal noise suppression. Furthermore, Guo et al [45] reported a one-pot method for synthesizing fluorescent aminoclay (F-AC) through a solvothermal method. They found that the fabricated F-AC produced a blue emission, excellent photostability, and good solubility.…”