Abstract
Luminescent Ln-MOFs (Eu0.075Tb0.925-MOF) were successfully synthesised through the solvothermal reaction of Tb(NO3)3·6H2O, Eu(NO3)3·6H2O, and the ligand pyromellitic acid. The product was characterised by X-ray diffraction (XRD), TG analysis, EM, X-ray photoelectron spectroscopy (XPS), and luminescence properties, and results show that the synthesised material Eu0.075Tb0.925-MOF has a selective ratio-based fluorescence response to Fe3+ or Cr2O72−. On the basis of the internal filtering effect, the fluorescence detection experiment shows that as the concentration of Fe3+ or Cr2O72− increases, the intensity of the characteristic emission peak at 544 nm of Tb3+ decreases, and the intensity of the characteristic emission peak at 653 nm of Eu3+ increases in Eu0.075Tb0.925-MOF. The fluorescence intensity ratio (I653/I544) has a good linear relationship with the target concentration. The detection linear range for Fe3+ or Cr2O72− is 10–100 μM/L, and the detection limits are 2.71 × 10−7 and 8.72 × 10−7 M, respectively. Compared with the sensor material with a single fluorescence emission, the synthesised material has a higher anti-interference ability. The synthesised Eu0.075Tb0.925-MOF can be used as a highly selective and recyclable sensing material for Fe3+ or Cr2O72−. This material should be an excellent candidate for multifunctional sensors.
Highlights
Heavy metals and inorganic anion pollutants in water pose hidden dangers to human health [1]
Salonen et al [2] confirmed that elevated iron content is an important risk factor for acute myocardial infarction, Bijeh et al [3] confirmed that the increased risk of cardiovascular disease is related to elevated iron content, and Jehn et al [4] confirmed that elevated iron could lead to abnormal baseline metabolism
Cr2O72− is an important oxidant in laboratories and industry [5], and it is highly carcinogenic in the environment and harmful to the ecology, environment, and biological system [6,7,8,9]
Summary
Heavy metals and inorganic anion pollutants in water pose hidden dangers to human health [1]. Many methods are used for the determination of Fe3+ and Cr2O72−, such as atomic emission spectrometry, atomic absorption spectrometry, inductively coupled plasma mass spectrometry, electrochemical methods, and ion chromatography These methods are complicated to operate, costly, and have a long detection time. Fluorescence sensing technology can meet the requirements of new analysis and detection technology due to its high sensitivity, fast analysis speed, strong selectivity, simple operation, and low experimental cost. In recent years, it has received extensive attention [10]. Xu et al [31] reported that CDs with strong fluorescence activity and Eu3+ were encapsulated in MOF-253, and the dual-emission ratio probe Eu3+/CDs@MOF-253 was synthesised to detect Hg2+. Eu0.075Tb0.925-MOF has excellent stability in aqueous solution, and it can detect Fe3+ and Cr2O72− in aqueous solution by dual-emission ratio fluorescence sensing, which provides a new idea for the fluorescence detection of Fe3+ and Cr2O72−
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