纯硫化锌量子点作为高选择性荧光探针测定危险的氰离子。
Pure zinc sulfide quantum dot as highly selective luminescent probe for determination of hazardous cyanide ion.
机构信息
Department of Chemistry, Razi University, Kermanshah, Iran.
Chemistry Department, Yasouj University, Yasouj 75918-74831, Iran.
出版信息
Mater Sci Eng C Mater Biol Appl. 2014 Mar 1;36:139-45. doi: 10.1016/j.msec.2013.12.001. Epub 2013 Dec 7.
A rapid and simple fluorescence method is presented for selective and sensitive determination of hazardous cyanide ion in aqueous solution based on functionalized zinc sulfide (ZnS) quantum dot (QD) as luminescent prob. The ultra-small ZnS QDs were synthesized using a chemical co-precipitation method in the presence of 2-mercaptoethanol (ME) as an efficient capping agent. The prepared pure ZnS QDs was applied as an optical sensor for determination of cyanide ions in aqueous solutions. ZnS nanoparticles have exhibited a strong fluorescent emission at about 424 nm. The fluorescence intensity of QDs is linearly proportional to the cyanide ion concentration in the range 2.44×10(-6) to 2.59×10(-5)M with a detection limit of 1.70×10(-7)M at pH11. The designed fluorescent sensor possesses remarkable selectivity for cyanide ion over other anions such as Cl(-), Br(-), F(-), I(-), IO3(-), ClO4(-), BrO3(-), CO3(2-), NO2(-), NO3(-), SO4(2-), S2O4(2-), C2O4(2-), SCN(-), N3(-), citrate and tartarate with negligible influences on the cyanide detection by fluorescence spectroscopy.
提出了一种基于功能化硫化锌 (ZnS) 量子点 (QD) 的快速、简单荧光法，用于选择性和灵敏地测定水溶液中的危险氰化物离子。在 2-巯基乙醇 (ME) 的存在下，使用化学共沉淀法合成了超小 ZnS QD，作为有效的封端剂。所制备的纯 ZnS QD 被用作光学传感器，用于测定水溶液中的氰化物离子。ZnS 纳米粒子在约 424nm 处表现出强荧光发射。在 pH11 下，QD 的荧光强度与氰化物离子浓度在 2.44×10(-6)至 2.59×10(-5)M 的范围内呈线性比例，检测限为 1.70×10(-7)M。所设计的荧光传感器对氰化物离子具有显著的选择性，相对于其他阴离子，如 Cl(-)、Br(-)、F(-)、I(-)、IO3(-)、ClO4(-)、BrO3(-)、CO3(2-)、NO2(-)、NO3(-)、SO4(2-)、S2O4(2-)、C2O4(2-)、SCN(-)、N3(-)、柠檬酸盐和酒石酸盐，对氰化物检测的荧光光谱影响可以忽略不计。
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