In situ Magnesiothermal Synthesis of Mesoporous MgO/OMC Composite for Sensitive Detection of Lead Ions

Abstract

Mesoporous materials have exceptional properties for application owing to their ability to absorb and interact with guest species. A novel MgO/OMC composite with mesoporous structure was successfully synthesized via in situ magnesiothermic reduction. The structure was confirmed by N2 sorption isotherms, X‐ray diffraction pattern (XRD), transmission electron microscopy (TEM) and scanning electron microscopy (SEM). By using nafion and bismuth films as co‐modifiers, the MgO/OMC composite material shows high sensitivity of 0.113 μA ⋅ L μg−1 and lower background current for electrochemical determination of lead ion (Pb2+) by using anodic stripping voltammetry. The high specific surface area and good mass transfer on the proposed mesoporous material, as well as the outstanding adsorption abilities of MgO to metal ions and the excellent conductivity of the carbon skeleton contribute to the enhanced electrochemical response of Pb2+. As the stripping response of Bi/MgO/OMC‐Nafion/PGE is highly linear (R2=0.998) over a Pb2+ concentration range of 2 to 300 μg/L, it was successfully used to analyse Pb2+ in real tap‐water samples with good recoveries.

Electrochemiluminescence Sensor Based on Electrospun Three-Dimensional Carbon Nanofibers for the Detection of Difenidol Hydrochloride

“…The results are presented in Figure 2. According to the XPS spectrum of the sample (Figure 2a), the peaks that appeared at 284.8 eV, 399 eV, and 532 eV can be assigned to C1s (89.51 at.%), N1s (5.43 at.%), and O1s (3.24 at.%), respectively [32]. The deconvoluted high-resolution C1s spectrum (Figure 2b) revealed the presence of three peaks at 284.5 eV, 285.8 eV, and 289 eV, which were attributed to C=C, C–C, and C=O, respectively [33,34].…”

Multifunctional Bismuth Oxychloride/Mesoporous Silica Composites for Photocatalysis, Antibacterial Test, and Simultaneous Stripping Analysis of Heavy Metals

“…Compared with bare glassy carbon electrode (GCE) and BiOCl/GCE, BiOCl–KIT-6/GCE achieved higher stripping peak currents of 100 μg/L Pb 2+ and 100 μg/L Cd 2+ ( Figure S7 ), which was probably attributed to the better formation of bismuth–lead–cadmium alloys on mesoporous KIT-6 supports. 37 …”

“…The optimal analytical parameters for ASV in the simultaneous determination of Pb 2+ and Cd 2+ obtained by BiOCl–KIT-6/GCE are outlined in Table . Compared with bare glassy carbon electrode (GCE) and BiOCl/GCE, BiOCl–KIT-6/GCE achieved higher stripping peak currents of 100 μg/L Pb 2+ and 100 μg/L Cd 2+ (Figure S7), which was probably attributed to the better formation of bismuth–lead–cadmium alloys on mesoporous KIT-6 supports …”

“…Compared with bare glassy carbon electrode (GCE) and BiOCl/GCE, BiOCl−KIT-6/GCE achieved higher stripping peak currents of 100 μg/L Pb 2+ and 100 μg/L Cd 2+ (Figure S7), which was probably attributed to the better formation of bismuth−lead−cadmium alloys on mesoporous KIT-6 supports. 37 Under the optimized conditions given in Table 1, the obtained stripping curves of Pb 2+ and Cd 2+ using BiOCl−KIT-6/GCE are shown in Figure 6a. The calibration curves of the simultaneous determination of Pb 2+ and Cd 2+ displayed two linear ranges from 0.2 to 10 and 10 to 300 μg/L with regression equations of y = 0.0263x + 0.7491 (R 2 = 0.9936, [Pb 2+ ] > 10 μg/L), y = 0.0785x + 0.3624 (R 2 = 0.9955, [Pb 2+ ] ≤ 10 μg/L), y = 0.00995x + 0.6132 (R 2 = 0.9983, [Cd 2+ ] > 10 μg/L), and y = 0.0412x + 0.3010 (R 2 = 0.9986, [Cd 2+ ] ≤ 10 μg/L), where y and x are the peak currents (μA) and heavy metal concentrations (μg/L), respectively (Figure 6b).…”

A Novel Electrochemical Sensor Based on A Glassy Carbon Electrode Modified with GO/MnO2 for Simultaneous Determination of Trace Cu(II) and Pb(II) in Environmental Water

“…Furthermore, nano‐metal oxides have obvious electron transfer capacity and large specific surface area, so they have more adsorption sites on the surface and can deposit more ions. Some metal oxides, such as ZnO, Fe 3 O 4 , SnO 2 , AlOOH, TiO 2 , MgO and MnO 2 have been widely used in the identification and detection of heavy metals due to their non‐toxic and catalytic properties …”