A new spectroscopic protocol for selective detection of water soluble sulfides and cyanides: Use of Ag-nanoparticles synthesized by Ag(I)-reduction via photo-degradation of azo-food-colorants

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• 作者：Niharendu Mahapatra ; Shubhashis Datta ; Mintu Halder
• 关键词：Ag NP ; silver nanoparticle ; CTAB ; cetyltrimethlyammonium bromide ; CMC ; critical micellar concentration ; C314 ; coumarin 314 ; LOD ; lowest detection limit ; SERS ; surface-enhanced Raman scattering ; R6G ; rhodamine 6G ; AEF ; apparent enhancement factors
• 刊名：Journal of Photochemistry and Photobiology A: Chemistry
• 出版年：1 February, 2014
• 年：2014
• 卷：275
• 期：Complete
• 页码：72-80
• 全文大小：2407 K

文摘

Slow and controlled visible photo-reduction of AgNO₃ by synthetic azo food-dyes in aqueous media produces spherical silver nanoparticles (Ag NPs). These show excellent selectivity toward inorganic anions (sulfide (S^{2鈭?/sup>) and cyanide (CN鈭?/sup>) with lowest detection limit (LOD) of 鈭?0 ppb. Complete photo-degradation of these dyes during nanoparticle formation can be very useful for environmental remediation and removal of dye toxicity. Detection of water soluble S2鈭?/sup> and CN鈭?/sup> is achieved by spectroscopic technique (fluorescence turn-on process), based on the etching of Ag NPs. Selectivity with respect to either of these two ions (S2鈭?/sup> or CN鈭?/sup>) is achieved by using suitable masking agents. This simple, rapid, and significantly low-cost sensing protocol can be employed at ease.}