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Sensors 2017, 17(11), 2628; https://doi.org/10.3390/s17112628

Interaction between Diethyldithiocarbamate and Cu(II) on Gold in Non-Cyanide Wastewater

1
Department of Chemistry, Soongsil University, Seoul 156-743, Korea
2
Department of Information Communication, Materials, Chemistry Convergence Technology, Soongsil University, Seoul 156-743, Korea
3
Department of Environmental Health Sciences, School of Public Health, Seoul National University, Seoul 08826, Korea
*
Authors to whom correspondence should be addressed.
Received: 25 September 2017 / Revised: 8 November 2017 / Accepted: 10 November 2017 / Published: 15 November 2017
(This article belongs to the Special Issue Surface Plasmon Resonance Sensing)
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Abstract

A surface-enhanced Raman scattering (SERS) detection method for environmental copper ions (Cu2+) was developed according to the vibrational spectral change of diethyldithiocarbamate (DDTC) on gold nanoparticles (AuNPs). The ultraviolet-visible (UV-Vis) absorption spectra indicated that DDTC formed a complex with Cu2+, showing a prominent peak at ~450 nm. We found Raman spectral changes in DDTC from ~1490 cm−1 to ~1504 cm−1 on AuNPs at a high concentration of Cu2+ above 1 μM. The other ions of Zn2+, Pb2+, Ni2+, NH4+, Mn2+, Mg2+, K+, Hg2+, Fe2+, Fe3+, Cr3+, Co2+, Cd2+, and Ca2+ did not produce such spectral changes, even after they reacted with DDTC. The electroplating industrial wastewater samples were tested under the interference of highly concentrated ions of Fe3+, Ni2+, and Zn2+. The Raman spectroscopy-based quantification of Cu2+ ions was able to be achieved for the wastewater after treatment with alkaline chlorination, whereas the cyanide-containing water did not show any spectral changes, due to the complexation of the cyanide with the Cu2+ ions. A micromolar range detection limit of Cu2+ ions could be achieved by analyzing the Raman spectra of DDTC in the cyanide-removed water. View Full-Text
Keywords: surface-enhanced Raman spectroscopy; plasmonic gold nanoparticles; diethyldithiocarbamate; industrial electroplating wastewater; cyanide removal surface-enhanced Raman spectroscopy; plasmonic gold nanoparticles; diethyldithiocarbamate; industrial electroplating wastewater; cyanide removal
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Ly, N.H.; Nguyen, T.D.; Zoh, K.-D.; Joo, S.-W. Interaction between Diethyldithiocarbamate and Cu(II) on Gold in Non-Cyanide Wastewater. Sensors 2017, 17, 2628.

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