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青柿子粗提物简易制备荧光碳点及对Fe3+的检测
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作者单位
韩雍,汪慧,宋曦,雒雪丽 1.陇东学院农林科技学院2.西北农林科技大学食品科学与工程学院 
基金项目:甘肃省教育厅一般项目(2017A-097);甘肃省庆阳市自然科学基金项目(ZJ2015-05)
中文摘要:以青柿子(Diospyros Kaki L.f)提取物作为碳源,通过水热法简易制备荧光碳点,并对其进行表征。结果显示所制备的碳点为类圆球颗粒,平均粒径为15.39 nm。X射线衍射(XRD)表明该碳点为类石墨烯的定形碳材料;光电子能谱(XPS)表明其构成元素较复杂,但以碳点为主的元素均有表达,且符合一般碳点材料的元素组成;该碳点表面含有羟基、羧基和氨基等活性基团;在350 nm处有紫外吸收,具有激发波长依赖性特点荧光,最大激发波长为355 nm,最大发射波长为445 nm;在355 nm激发波长下,其光谱发射在pH 5.0~11.0范围内具有稳定的荧光。该碳点在365 nm紫外光照射下,表现出较强的蓝色荧光,对Fe3+具有较好的特异识别能力,可用于Fe3+的荧光检测。Fe3+浓度在0.45~50 μmol/L 范围内与PM-CDs的荧光强度呈线性关系(r2=0.923 4)。试验在碳点纯化方面存在局限,需进一步探讨生物质材料碳点纯化方式,提高目标分析物的识别位点保有量,获得高效检测目标。
中文关键词:碳点  水热法合成  柿子  Fe3+  荧光探针
 
Facile Synthesis of Fluorescent Carbon Dots Using Rough Extract of Unripe Persimmon and Their Application in Fe3+ Detection
Abstract:Fluorescent carbon dots(PM-CDs) were synthesized by a simple one step hydrothermal carbonization method with the extract of unripe persimmon(Diospyros Kaki L.f).TEM image showed that the PM-CDs were homogeneous spheres with a average particle diameter about 15.39 nm.XRD revealed that the PM-CDs were a kind of amorphous carbon material like graphene.The elements of PM-CDs were determined by XPS,which contained complicated elements,and the principal elements presented in PM-CDs were in accordance with those in the general CDs.The PM-CDs contained some active groups,such as hydroxyl,carboxyl and amino.There existed an absorbance for PM-CDs at 350 nm,which emitted an excitation dependent fluorescence at a maximum excitation wavelength of 355 nm and a maximum emission wavelength of 445 nm.Meanwhile,the PM-CDs had a pH independent fluorescence,and showed a stable emission peak in a pH range of 5.0-11.0.The PM-CDs had a strong blue fluorescence under UV irradiation at 365 nm.The PM-CDs had higher selectivity toward Fe3+ compared to other co existed metal ions.The fluorescence intensity of PM-CDs had a linear response to Fe3+ in the concentration range of 0.45-50 μmol/L with correlation coefficients(r2) of 0.923 4,which demonstrated that they were available in the detection of Fe3+.It is necessary to further explore the purification technology for CDs from biomaterials,improving the recognition sites for target analytes and obtaining the higher efficiency for detection.
Key Words:carbon dots(CDs)  hydrothermal synthesis  persimmon  Fe3+  fluorescent probe
引用本文:韩雍,汪慧,宋曦,雒雪丽.青柿子粗提物简易制备荧光碳点及对Fe3+的检测[J].分析测试学报,2018,37(12):1475-1479.
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