Green Synthesis of Silver Nanoparticles Stabilized with Mussel-Inspired Protein and Colorimetric Sensing of Lead(II) and Copper(II) Ions

Abstract

This articles reports a simple and green method for preparing uniform silver nanoparticles (AgNPs), for which self-polymerized 3,4-dihydroxy-l-phenylalanine (polyDOPA) is used as the reducing and stabilizing agent in aqueous media. The AgNPs functionalized by polyDOPA were analyzed by UV–Vis spectroscopy, high-resolution transmission electron microscopy (HR-TEM), Fourier transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA), Raman spectrophotometry, and X-ray diffraction (XRD) techniques. The results revealed that the polyDOPA-AgNPs with diameters of 25 nm were well dispersed due to the polyDOPA. It was noted that the polyDOPA-AgNPs showed selectivity for Pb2+ and Cu2+ detection with the detection limits for the two ions as low as 9.4 × 10−5 and 8.1 × 10−5 μM, respectively. Therefore, the polyDOPA-AgNPs can be applied to both Pb2+ and Cu2+ detection in real water samples. The proposed method will be useful for colorimetric detection of heavy metal ions in aqueous media.

Colorimetric Detection Based on Localized Surface Plasmon Resonance Optical Characteristics for Sensing of Mercury Using Green-Synthesized Silver Nanoparticles

“…XRD diffraction peaks of 76°, 64°, 46°, and 38°that correspond to crystal facets for (3 1 1), (2 2 0), (2 0 0), and (1 1 1) were found, as illustrated in Figure 5. ere is significant concurrence between face-centred cubic (FCC) structure [76,77] Ag crystal and the peaks, an indication of crystalline silver presence in silver nanoparticles. Diffraction peaks that corresponded to the precursors (AgNO 3 ) or by-products (for instance, silver oxide) did not exist, thus confirming that in situ formation of metallic silver was only possible through reaction of onion extracts.…”

Facile and Green Fabrication of Carrageenan-Silver Nanoparticles for Colorimetric Determination of Cu2+ and S2−

“…However, copper ions are an environmental pollutant. If copper-containing pollutants are discharged without treatment, they will cause great harm to the environment [6,7]. If the human body is exposed to excessive copper ions for a long time, it will affect human health causing dizziness, nausea, muscle soreness, Alzheimer's disease, Parkinson's disease, and other diseases, and even lead to death [7,8].…”

“…If copper-containing pollutants are discharged without treatment, they will cause great harm to the environment [6,7]. If the human body is exposed to excessive copper ions for a long time, it will affect human health causing dizziness, nausea, muscle soreness, Alzheimer's disease, Parkinson's disease, and other diseases, and even lead to death [7,8]. Therefore, it is of great significance to design a copper ion detection sensor with high selectivity and sensitivity in the field of environment [9,10].…”

Facile Interpretation of Catalytic Reaction between Organic Dye Pollutants and Silver Nanoparticles with Different Shapes

“…Figure 4 shows the XRD pattern of Ag NPs with different shapes. The crystalline peaks at about 38.0°, 44.2°, 64.5°, and 77.5°were assigned to the (111), (200), (220), and (311) planes, respectively, of a faced-centered cubic (fcc) Ag crystal, indicating that Ag NPs with different shapes were composed of crystalline Ag [27].…”