Abstract：The carbon quantum dots (CQDs) with fluorescence property were one-step synthesized at low temperature by hydrothermal method using edible fresh cucumber juice as the precursor. The effect of hydrothermal reaction temperature, hydrothermal reaction time and pH of solution on the fluorescence property of CQDs was investigated. Meanwhile, the light stability was discussed from three aspects including salt ion concentration, UV-irradiation time and storage period. The results showed that the prepared CQDs exhibited high fluorescence quantum yield (3.9%) under the following experimental conditions: the hydrothermal reaction temperature was 150℃, the reaction time was 6h, and the pH of solution was controlled at 12. Meanwhile, the CQDs had good light stability. The further study results indicated that Cu2+ showed obvious quenching effect on the fluorescence intensity of cucumber juice CQDs prepared above. Hereby a new detection method of Cu2+ was established. The concentration of Cu2+ in range of 0.1×10-6-5.8×10-6 mol/L had good linear relationship with the fluorescence quenching level of cucumber juice CQDs. The detection limit was 0.041μmol/L. The proposed method was applied to the determination of Cu2+ in river water and domestic wastewater. The found results were basically consistent with those obtained by atomic absorption spectrometry (AAS). The relative standard deviations (RSD, n=5) were between 3.4% and 4.3%.
黄运瑞,张廉奉,卢驰元,等.分散液相微萃取光度法测定水中痕量铜[J].冶金分析,2016,36(12):65-68.HUANG Yun-rui,ZHANG Lian-feng,LU Chi-yuan,et al.Determination of trace copper in water by dispersive liquid phase microextraction combined with spectrophotometry[J].Metallurgical Analysis,2016,36(12):65-68.
[2]
陈钰,龚正君,杨顺生,等.改性玉米秸秆吸附Cu2+的动力学和热力学[J].环境工程学报,2013,7(2):523-529.CHEN Yu,GONG Zheng-jun,YANG Shun-sheng,et al.Kinetic and thermodynamic research on Cu2+ adsorption by modified wheat straw[J].Chinese Journal of Environmental Engineering,2013,7(2):523-529.
[3]
陆丽丽,陶贤继,胡家文.水环境中Cu2+检测和处理研究进展[J].环境科技,2010,23(2):125-127.LU Li-li,TAO Xian-ji,HU Jia-wen.Research progress on determination and treatment of Cu2+ in water environment[J].Environmental Science and Technology,2010,23(2):125-127.
[4]
刘声燕,王益林,杨昆.近红外发射CdSeTe量子点测定铜离子[J].发光学报,2013,7(2):523-529.LIU Sheng-yan,WANG Yi-lin,YANG Kun.Determination of copper ion by near-infrared-emitting CdSeTe quantum dots[J].Chinese Journal of Luminescence,2013,7(2):523-529.
[5]
杨海芬,张浩,李萍,等.基于氮掺杂碳点荧光猝灭法检测铜离子[J].光谱学与光谱分析,2016,36(10):369-370.YANG Hai-fen,ZHANG Hao,LI Ping,et al.The fluorescence quenching method for detecting copper ion based on nitrogen doped carbon dots[J].Spectroscopy and Spectral Analysis,2016,36(10):369-370.
[6]
赵艳,高楼军,孙雪华,等.铁(III)的碳量子点荧光猝灭效应研究及其应用[J].冶金分析,2015,35(12):60-63.ZHAO Yan,GAO Lou-jun,SUN Xue-hua,et al.Study on carbon quantum dots fluorescence quenching effect of iron (III) and its application[J].Metallurgical Analysis,2015,35(12):60-63.
[7]
Wen X P,Shi L H,Wen G M,et al.Green and facile synthesis of nitrogen-doped carbon nanodots formulticolor cellular imaging and Co2+ sensing in living cells[J].Sens.Actuators B:Chem.,2016,235:179-187.
[8]
LIU H P,YE T,MAO C D.Fluorescent carbon nanoparticles derived from candle soot[J].Angew.Chem.Int.Ed.,2007,46:6473-6475.
[9]
ZHENG L Y,CHI Y W,DONG Y Q,et al.Electrochemiluminescence of water-soluble carbon nanocrystals released electrochemically from graphite[J].J.Am.Chem.Soc.,2009,131:4564-4565.
[10]
LIU C J,ZHANG P,ZHAI X Y,et al.Nano-carrier for gene delivery and bioimaging based on carbon dots with PEI-passivation enhanced fluorescence[J].Biomaterials,2012,33:3604-3613.
[11]
LI H T,HE X D,LIU Y,et al.One-step ultrasonic synthesis of water-soluble carbon nanoparticles with excellent photoluminescent properties[J].Carbon,2011,49:605-609.
[12]
LIU S,TIAN J Q,WANG L,et al.Hydrothermal treatment of grass: alow-cost, green route to nitrogen-doped, carbon-rich,photoluminescentpolymer nanodots as an effective fluorescent sensing platform for label-free detection of Cu (II) ions[J].Adv. Mater.,2012,24:2037-2041.
[13]
刘文,李婷婷,张冰,等.基于绿色天然物质合成荧光碳点及其性质和应用综述[J].材料导报,2019,33(2):402-409.LIU Wen,LI Ting-ting,ZHANG Bing,et al.Properties and applications of fluorescent carbon dots prepared by green natural substances:a review[J].Materials Reports,2019,33(2):402-409.
[14]
ZHONG D,MIAO H,YANG K,et al.Carbon dots originatedfrom carnation for fluorescence and colorimetric pH sensing[J].Mater. Lett.,2016,166:89-92.
[15]
杨晓婧,李美丽,白建华.原子吸收光谱法测定废水中的重金属离子[J].光谱实验室,2010,27(1):247-249.YANG Xiao-jing,LI Mei-li,BAI Jian-hua.Determination of heavy metal ions in waste water by the flame atomic absorption spectrometry[J].Chinese Journal of Spectroscopy Laboratory,2010,27(1):247-249.
