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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。
Using waste rice bran as raw material and concentrated sulfuric acid as dehydrating agent, carbon nanoparticles (CNPs) were prepared by carbonization to investigate the characteristics of CNPs fluorescence emission, the quenching effect of metal ions and their application as Sn (II) ion sensing materials. The best yield of CNPs was: sulfuric acid concentration 12 mol / L, heating temperature 120 ℃ and constant temperature time 30 min. The maximum intensity of the strong blue light in the sample is 439 nm. Fluorescence is quenched by the addition of metal ions that form a complex between the metal ions and the surface of the CNPs. Sn (II) ions have a significant quenching effect on CNPs fluorescence. The quenching effect of Sn (II) ion concentration conforms to the Stern-Volmer linearity, and the Sn (II) ion is 6.13 mmol / L. The detection limit of Sn (II) ion is 18.7μmol / L.