论文部分内容阅读
利用寡聚胸腺嘧啶核苷酸(PolyT)与碳纳米管(CNTs)之间的自发非共价修饰作用形成稳定的CNTs/PolyT纳米复合体系,采用共振光散射(RLS)和紫外-可见吸收光谱考察了该复合体系与汞离子的相互作用。实验结果表明,水相中单链PolyT能与CNTs形成稳定而均匀的分散体系,而单链PolyT极易捕获汞离子生成特异性的T-Hg-T双链结构,使其从CNTs上解离。此时,CNTs在电解质存在下会发生聚集并容易被离心而下沉,导致体系的RLS强度(IRLS)发生变化。不同浓度的汞离子能使复合体系的IRLS呈现梯度变化,并且其它金属离子与CNTs/PolyT的作用非常微弱。由此,可实现汞离子选择性定性、定量分析。
A stable CNTs / PolyT nanocomposite system was formed by spontaneous noncovalent modification of oligothymidine (PolyT) and carbon nanotubes (CNTs). Resonance light scattering (RLS) and UV-Vis absorption spectra The interaction between mercury and this composite system was investigated. The experimental results show that the single-stranded PolyT can form a stable and uniform dispersion with CNTs in the aqueous phase, while the single-stranded PolyT can easily capture the mercury ion to generate a specific T-Hg-T double-stranded structure, which can be dissociated from the CNTs . At this point, CNTs accumulate in the presence of electrolytes and are easily centrifuged and sink, resulting in changes in the system’s RLS intensity (IRLS). Different concentration of mercury ion can make the IRLS of the composite system change gradient, and other metal ions have very weak effect with CNTs / PolyT. As a result, mercury ion can be selectively qualitatively and quantitatively analyzed.