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

机译:非氰化物废水中金上的二乙基二硫代氨基甲酸酯与铜(II)的相互作用

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摘要

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.
机译:根据二乙基二硫代氨基甲酸酯(DDTC)在金纳米粒子(AuNPs)上的振动光谱变化,开发了一种用于环境铜离子(Cu 2 + )的表面增强拉曼散射(SERS)检测方法。紫外-可见(UV-Vis)吸收光谱表明,DDTC与Cu 2 + 形成了络合物,在〜450 nm处有一个明显的峰。我们发现高浓度Cu 2 + 的AuNPs上DDTC的拉曼光谱变化从〜1490 cm -1 到〜1504 cm -1 大于1μM。 Zn 2 + ,Pb 2 + ,Ni 2 + ,NH4 + ,Mn 2 + ,Mg 2 + ,K + ,Hg 2 + ,Fe 2 + ,Fe 3 + ,Cr 3 + ,Co 2 + ,Cd 2 + 和Ca 2 + 即使在与DDTC反应后也不会产生这样的光谱变化。在高浓度的Fe 3 + ,Ni 2 + 和Zn 2 + 的干扰下测试了电镀工业废水样品。碱性氯化处理后的废水能够实现基于拉曼光谱的Cu 2 + 离子定量,而由于氰化的络合,含氰化物的水没有任何光谱变化。带有Cu 2 + 离子的氰化物。通过分析去除氰化物的水中DDTC的拉曼光谱,可以实现Cu 2 + 离子的微摩尔范围检测极限。

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