生物质碳量子点的简便合成及对Hg^(2+)荧光传感研究

Facile synthesis of biomass carbon dots and its sensing property towards Hg^(2+)

将厌氧条件处理的牛粪作为碳源通过水热法合成了蓝色荧光发射的碳量子点。该量子点在水中稳定性和分散性良好,具有激发波长依赖的荧光发射现象,从430nm红移至560nm。在中性水溶液中,汞离子(Hg^(2+))对碳量子点的荧光发射干扰明显。随着Hg^(2+)体积的增加,450nm处的荧光强度逐渐减弱,两者呈现出较好的线性关系。对定性定量检测环境中的Hg^(2+)具有重要的意义。

The blue fluorescent carbon dots （CDs） were prepared under hydrothermal conditions,utilizing anaerobic treated cattle manure as a carbon source. The as-synthesized carbon dots had better stability and dispersibility in water, along with the excitation wavelength dependent photoluminescenee behavior,where the emission peaks shifted from 430 to 560nm. In neutral aqueous media,the fluorescence intensity was significantly affected upon addition of Hg2＋ ions. With the gradual addition of Hg2＋ , the fluorescence peak at 450nm decreased, and showed a good linear relationship. This was impor- tant to qualitative and quantitative detection of Hg2＋ in the environment.