Status : Verified
| Personal Name | Almaquer, Francis Eric P. |
|---|---|
| Resource Title | Citrate-stabilized silver nanoparticles for copper (II) detection in hard water |
| Date Issued | 24 June 2018 |
| Abstract | New techniques for Cu (II) detection are being investigated to overcome the disadvantages of established methods in terms of portability, high capital cost and being confined to the skilled. Colorimetry using nanoparticles is an attractive alternative because it is fast, simple, and easy to use. In this study, citrate-stabilized silver nanoparticles (AgNP) were used to detect Cu (II) particularly in hard water where Mg (II) and Ca (II) are interfering ions. The AgNP were synthesized using sodium borohydride and sodium citrate as reducing and stabilizing agents, respectively. UV Vis analysis confirmed successful AgNP synthesis through presence of absorbance peak near 400 nm and a PWHM of 56 nm indicated monodispersity of particles. TEM analysis revealed spherical particles with average diameter of 11 nm. Varying concentrations of Cu (II) from 0 to 40x10-4 M were interacted with the AgNP assay. Visually, the solution changed in color from yellow to orange and UV Vis analysis showed emergence of additional peak at 450 nm. Both changes are attributed to the aggregation of nanoparticles due to presence of Cu (II). This was confirmed by TEM analysis showing formation of star-shaped nanoclusters attributed to bimetallic Ag/Cu. A calibration curve was established and determined that the behavior of peak ratio (450/400 nm) is directly proportional to the Cu (II) concentration with good linear fit at R2 = 0.9749. The detection and quantification limits were determined to be 6.59x10-4 M and 21.97x10-4 M, respectively. For practical application, the assay was tested on hard water with high levels of Mg (II) and Ca (II) at 30x10-4 M each. Tests showed that Mg (II) and Ca (II) can interfere with Cu (II) detection because of their high relative responses (86.53% and 32.47%) compared to Cu (II). Addition of EDTA to the assay successfully masked the presence of Mg (II) and Ca (II) by lowering their relative responses to 33.74% and 19.62%, respectively, while that of Cu (II) |
| Degree Course | MS Chemical Engineering |
| Language | English |
| Keyword | silver nanoparticles; citrate; copper; hard water |
| Material Type | Thesis/Dissertation |
Preliminary Pages
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Category : I - Has patentable or registrable invention of creation.
Access Permission : Limited Access