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荧光碳点的合成及其在绿麦隆检测中的应用研究
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作者单位
廖秀芬,曾秋莲,易忠胜,韦红玲,梁杨琳,欧玉玲,吕春秋 1.广西出入境检验检疫局检验检疫技术中心2.桂林理工大学化学与生物工程学院3.广西中环能检测技术有限公司4.贺州出入境检验检疫局 
基金项目:国家自然科学基金(21267008);广西重点研发计划基金(桂科AB17292071);广西检验检疫局科技计划项目基金(2018GXCIQ107)
中文摘要:提出了一种以草木炭为碳源,采用一步水热法合成荧光碳点(CDs)的方法,并将所合成的CDs应用于农田水中绿麦隆的检测。探究了草木炭添加量、过氧化氢浓度、反应pH值、水热温度、水热时间等因素对合成CDs的影响。所合成的CDs最大激发和发射波长分别为340 nm和450 nm,发射光谱随激发波长的增大基本无红移。傅立叶红外光谱结果表明:CDs表面存在大量羟基(—OH)和羧基(—COOH)基团。绿麦隆对合成的CDs表现出选择性荧光猝灭,可应用于绿麦隆的检测。该方法对绿麦隆测定的线性范围为0.15~3.15 mg·L-1,相关系数(r2)为 0.999 3,检出限为0.05 mg·L-1。方法用于实际样品分析,加标回收率为93.3%~112%,相对标准偏差(RSD)不大于4.9%。实验考察了与绿麦隆结构相似的农药和常见阴阳离子对CDs荧光强度的影响,并对绿麦隆对碳点的猝灭机理进行了探讨。
中文关键词:碳点  草木炭  水热法  绿麦隆  荧光
 
Study on Synthesis of Fluorescent Carbon Dots and Their Applications in Determination of Chlortoluron
Abstract:The carbon dots(CDs)were synthesized by one step hydrothermal method using the plant soot as raw material.Effects of plant soot amount,concentration of H2O2 solution,pH value of reaction solution,reaction time and temperature were also discussed.The maximum excitation and emission wavelengths of CDs were 340 nm and 450 nm,respectively,and no red shift was observed with the increase of excitation wavelength.The Fourier-transform infrared(FTIR) spectra characterization demonstrated that CDs contained lots of —COOH and —OH groups on their surface.The synthesized CDs could be used as a tool for the detection on chlortoluron as their fluorescent intensity could be selectively quenched by chlortoluron.The linear range of the method for chlortoluron was 0.15-3.15 mg·L-1,with a correlation coefficient(r2) of 0.999 3 and a detected limit of 0.05 mg·L-1.The proposed method was applied in the detection of chlortoluron in irrigation water samples with recoveries of 93.3%-112% and RSDs not more than 4.9%.Meanwhile,the influences of pesticides with similar structures to chlortoluron and common ions on the system were investigated,and the quenching mechanism for chlortoluron toward CDs was also discussed.
Key Words:carbon dots  plant soot  hydrothermal method  chlortoluron  fluorescence
引用本文:廖秀芬,曾秋莲,易忠胜,韦红玲,梁杨琳,欧玉玲,吕春秋.荧光碳点的合成及其在绿麦隆检测中的应用研究[J].分析测试学报,2018,37(9):1040-1045.
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