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首页> 外文期刊>Chemistry: A European journal >Cyanide sensing with organic dyes: Studies in solution and on nanostructured Al2O3 surfaces
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Cyanide sensing with organic dyes: Studies in solution and on nanostructured Al2O3 surfaces

机译：有机染料对氰化物的感测：在溶液中和在纳米结构的Al2O3表面上的研究

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The synthesis of two new azo phenyl thiourea compounds and their optical response to different anions is reported herein. Solution studies in methanol indicate that cyanide induces a colour change in these dyes (whereas no changes are observed in the presence of other anions, such as F-, Cl-, Br-, CH3COO-, H2PO4-, HSO4-). Interestingly, in DMSO these dyes are responsive not only to cyanide, but also to fluoride, acetate and dihydrogen phosphate. Each of these anions induces a different colour change. In the second part of the paper, we report the attachment of one of these dyes onto nanostructured TiO2 and Al2O3 films. The stability of these sensitised films to pH was studied and we concluded that the sensitised Al2O3 films are more robust, and hence, better than the TiO2 for anion sensing. The dye-sensitised A(2)O(3) films were immersed in solutions of different anions and their response studied. The films can detect cyanide down to 3 ppm in aqueous solution with relatively good selectivity over other anions.
机译：本文报道了两种新的偶氮苯基硫脲化合物的合成及其对不同阴离子的光学响应。在甲醇中进行的溶液研究表明，氰化物会在这些染料中引起颜色变化（而在其他阴离子（例如F-，Cl-，Br-，CH3COO-，H2PO4-，HSO4-）存在下未观察到变化。有趣的是，在DMSO中，这些染料不仅对氰化物有响应，而且对氟化物，乙酸盐和磷酸二氢有响应。这些阴离子各自引起不同的颜色变化。在本文的第二部分中，我们报告了其中一种染料附着在纳米结构的TiO2和Al2O3薄膜上。研究了这些敏化膜对pH的稳定性，我们得出的结论是，敏化的Al2O3膜更坚固，因此在阴离子传感方面比TiO2更好。染料敏化A（2）O（3）膜浸入不同阴离子的溶液中，并研究了它们的响应。该膜可以检测水溶液中低至3 ppm的氰化物，并且相对于其他阴离子具有相对较好的选择性。

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