SENSOR POTENCIOMÉTRICO BASADO EN NANOPARTÍCULAS DE SULFURO DE PLATA SOPORTADAS EN MATERIALES CARBONOSOS PARA LA DETECCIÓN DE CIANURO LIBRE
| Autor: | Andy Alfredo Cárdenas-Riojas, Ademar Wong, Maria Del Pilar T. Sotomayor, Adolfo La Rosa-Toro, Angélica María Baena-Moncada |
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| Jazyk: | English<br />Spanish; Castilian<br />Portuguese |
| Rok vydání: | 2019 |
| Předmět: | |
| Zdroj: | Química Nova, Vol 42, Iss 3, Pp 255-261 (2019) |
| Druh dokumentu: | article |
| ISSN: | 1678-7064 0100-4042 |
| DOI: | 10.21577/0100-4042.20170338 |
| Popis: | Two sensors were synthesized for the detection of free cyanide (CN-), based on silver sulfide nanoparticles (Np-Ag2S) supported on Multiwall Carbon Nanotubes (MWCNT) and hierarchical porous carbon (HPC). The Ag2S/HPC400 and Ag2S/MWCNT were characterized by physicochemical techniques such as Raman spectroscopy, X-Ray diffraction (XRD) and Scanning electron microscopy (SEM). These sensors were evaluated against the detection of free cyanide by potentiometry; the stability, reproducibility and linearity of each sensor were determined. A limit of detection of 3.34 µg L-1 and a limit of quantification of 11.05 µg L-1 for Ag2S/HPC400 sensor was obtained; while for the Ag2S/MWCNT sensor a limit of detection and limit of quantification value of 23.17 µg L-1 and 76.46 µg L-1 were obtained, respectively. The results show that the presence of carbonaceous materials with a hierarchical structure improves the limits of quantification and detection of the Ag2S/HPC400 sensor. |
| Databáze: | Directory of Open Access Journals |
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