Sulfide Sensor Based on Room-Temperature Phosphorescence of PbO/SiO₂ Nanocomposite

Abstract

A new strategy for the fabrication of a sulfide sensor based on room-temperature phosphorescence (RTP) of PbO/SiO(2) nanocomposite is proposed. The PbO/SiO(2) phosphor is prepared by a sol-gel method, and it produces highly emissive broad-band RTP under the irradiation of UV light. The phosphorescence intensity of PbO/SiO(2) nanocomposite could be quenched by sulfide, and the response behavior of the sensor is dependent on the value of pH of the solution. At pH 11.0, the sensor exhibits a linear response toward sulfide at the concentration range from 2.67 to 596 microM. The detection limit for the sensor is estimated to be 0.138 microM (3 sigma), and the precision for five replication detections of 6 microM sulfide is 1.82% (relative standard deviation). The color of the sensor and its phosphorescence intensity change obviously and could be observed with the naked eye when there was continuous addition of sulfide from the concentration of 50 microM. The phosphorescence intensity of quenched PbO/SiO(2) phosphor can be recovered when dipping it into H(2)O(2) solution, which demonstrates a good sulfide response characteristic of reusability. Furthermore, the sensor is easy to apply for trace hydrogen sulfide determination in the gas phase.

Experimental and computational investigation of a DNA-shielded 3D metal–organic framework for the prompt dual sensing of Ag+ and S2−

“…4b, also showed good linearity between uorescence intensity and S 2À concentration with the linear equation of Y ¼ À89.855X + 544.153 (R 2 ¼ 0.9978), giving an LOD value of 5.5 nM for S 2À . Such a value is much lower than some nanocomposite (138 nM), 26 gold nanoparticles (80 nM), 27 DNA@copper nanoparticles (80 nM), 28 and nano Ag-carbon (27 nM), 29 and comparable to g-C 3 N 4 nanosheets (3.5 nM) (Table S4 †). 25 All the results indicate that the detection process was not disturbed by the variation of the pH values.…”

Synchronous Multi-sits Determination of H2O2 in Vertical Water Based on Phosphor TiO2/SiO2 Nanocomposite

“…22 Reports on silica-based phosphors have noted that the highly emissive broad and stable materials were important for display and lighting technologies. 23 On this basis, a series of metal-doped nanosilica, such as TiO2/SiO2, 24,25 PbO/SiO2, 26 ZnO/SiO2, 27 and B2O3/SiO2 28 , were synthesized and have performed some excellent detection. In this study, the active phosphor of TiO2/SiO2 nanoparticles was successfully used to develop a reliable phosphorescence test kit and applied to the determination of H2O2 in a complicated bleaching effluent sample.…”

Colorimetric detection of sulfide ions in water samples based on the in situ formation of Ag2S nanoparticles

“…Sulfide ions, a kind of widespread environmental contaminant, are frequently distributed in natural water and wastewater samples where they are either used as a reactant or are produced as a by-product of manufacturing or industrial process [1][2][3][4]. Sulfide ions easily generate H 2 S gas that is responsible for the corrosion of many metals.…”