以废米糠为原料,浓硫酸为脱水剂,通过炭化法制备出炭纳米颗粒( CNPs),探讨CNPs荧光发射特征、金属离子的淬灭效应以及作为Sn(II)离子传感材料应用。 CNPs产率最佳条件为：硫酸浓度12 mol/L、加热温度120℃及恒温时间30 min。样品在水中强蓝光的最大发射波为439 nm。通过加入金属离子,使金属离子与CNPs表面间形成复合物而淬灭荧光。 Sn(II)离子对CNPs荧光具有显著的淬灭效应。 Sn(II)离子浓度对淬灭效应符合Stern-Volmer线性关系,Sn(II)离子为6.13 mmol/L。 Sn(II)离子的检测限为18.7μmol/L。
This work reports on a synthesis of carbon nanoparticles ( CNPs) from waste rice husk by thermally-assisted carboniza-tion in the presence of concentrated sulfuric acid. The fluorescent emmision characteristics of the CNPs, their quenching effects by metal ions and their use as a sensing material for Sn( II) ions were investigated. Results indicated that the yield of CNPs was opti-mized at a sulphuric acid concentration of 12 mol/L, heating temperature of 1 200 ℃ and heating time of 30 min. The sample showed a strong blue luminescence in water with a maximum emission at 439 nm. The fluorescence can be quenched by adding vari-ous metal ions by the formation of complexes between the metal ions and surface of the CNPs. Sn( II) ions had the most significant quenching effect on the fluorescence of the CNPs, which is concentration-dependent. The concentration dependent quenching was linearized with the Stern-Volmer equation, and showed a linear response up to a Sn(II) concentration of 6. 13 mmol/L. The limit of detection for Sn(II) ions is 18. 7 μmol/L with good repeatability.
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