亲水性荧光碳点的制备及其特异性检测废水中的Fe(Ⅲ)离子
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摘要
荧光碳点作为一种新型碳材料,广泛应用在光催化、生物成像、靶向给药和电化学等方面。本文使用酵母粉作为碳点合成的起始原料,经微波加热的一锅法获得高效荧光碳点,碳点产率达到55%,其荧光量子产率高达35%。通过荧光光谱、UV-Vis、TEM和FT-IR等表征发现,碳点尺寸在5～10 nm,分散均匀,表面具有丰富的含氮基团,可有效调节共轭平面的电荷密度和带宽能隙。随后考察了碳点在定量检测含Fe~(3+)废水污染物中的应用,发现碳点可作为一种荧光探针在亲水溶液中有效地检测Fe~(3+),当碳点的质量浓度为0. 003%时,有较宽的Fe~(3+)检测范围(2. 5×10~(-7)～0. 52mol/L)、较高的选择性和敏锐性。
Fluorescent carbon dots,a new type of carbon material,haves been widely used in photocatalysis,biological imaging,targeted drug delivery and electrochemical catalysis. In this article,yeast powder has been chosen as start materials for carbon dots preparation via one-pot process. Under the condition of microwave-assisted heating,a fluorescent quantum yield of 35% was achieved. The optical properties and microscopic morphology of carbon dots were further characterized by using TEM,FT-IR,UV-Vis and fluorescent spectra. It was found that the particles size of carbon dots range from 5 to 10 nm. It has abundant surficial nitrogen-containing groups which can effectively adjust the charge density and bandwidth gap of the conjugated plane. Furthermore,carbon dots were used as an effective fluorescent probe for the detection of Fe~(3+) in aqueous solution. When the concentration of carbon dots was 0. 003( wt) %,the testing range of Fe~(3+) could be 2. 5×10~(-7)～ 0. 52 mol/L.
Fluorescent carbon dots,a new type of carbon material,haves been widely used in photocatalysis,biological imaging,targeted drug delivery and electrochemical catalysis. In this article,yeast powder has been chosen as start materials for carbon dots preparation via one-pot process. Under the condition of microwave-assisted heating,a fluorescent quantum yield of 35% was achieved. The optical properties and microscopic morphology of carbon dots were further characterized by using TEM,FT-IR,UV-Vis and fluorescent spectra. It was found that the particles size of carbon dots range from 5 to 10 nm. It has abundant surficial nitrogen-containing groups which can effectively adjust the charge density and bandwidth gap of the conjugated plane. Furthermore,carbon dots were used as an effective fluorescent probe for the detection of Fe~(3+) in aqueous solution. When the concentration of carbon dots was 0. 003( wt) %,the testing range of Fe~(3+) could be 2. 5×10~(-7)～ 0. 52 mol/L.
引文
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[5]Y K Yang,K J Yook,J Tae.J.Am.Chem.Soc.,2005,127(48):16760~16761.
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[7]Y Q Zhang,X D Li,L J Gao et al.ChemPhysChem,2014,15(3):507~513.
[8]Y M Guo,Z Wang,H W Shao et al.Carbon,2013,52(2):583~589.
[9]A Kumara,A R Chowdhuria,D Lahab et al.Sens.Actuat.B,2017,242:679~686.
[10]L L Cui,W Shi,J X Wang.Anal.Methods,2010,2(5):448~450.
[11]H L Li,J F Zhai,J Q Tian et al.Biosens.Bioelectron.,2011,26(12):4656~4660.
[12]H Zhu,X L Wang,Y L Li et al.Chem.Commun.,2009,34:5118~5120.
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[15]唐志姣,李攻科,胡玉玲.化学进展,2016,28(10):1455~1461.