应用化学 ›› 2022, Vol. 39 ›› Issue (8): 1294-1302.DOI: 10.19894/j.issn.1000-0518.210465

• 研究论文 • 上一篇    下一篇

碳量子点增强气液相化学发光检测二氧化碳

唐连波1, 付大友1, 陈琦2, 奉阳润2, 熊桠林1, 王竹青1()   

  1. 1.四川轻化工大学化学工程学院,自贡 643000
    2.四川轻化工大学化学与环境工程学院,自贡 643000
  • 收稿日期:2021-09-15 接受日期:2022-01-11 出版日期:2022-08-01 发布日期:2022-08-04
  • 通讯作者: 王竹青
  • 基金资助:
    四川省自贡市科技局项目(2018YYJC12);自贡市科技局项目(2017xc20)

Enhanced Gas⁃Liquid Chemiluminescence by Carbon Dots for Determination of Carbon Dioxide

Lian-Bo TANG1, Da-You FU1, Qi CHEN2, Yang-Run FENG2, Ya-Lin XIONG1, Zhu-Qing WANG1()   

  1. 1.School of Chemical Engineering,Sichuan University of Science & Engineering,Zigong 643000,China
    2.School of Chemical and Environmental Engineering,Sichuan University of Science & Engineering,Zigong 643000,China
  • Received:2021-09-15 Accepted:2022-01-11 Published:2022-08-01 Online:2022-08-04
  • Contact: Zhu-Qing WANG
  • About author:wangzq128@163.com
  • Supported by:
    the Project of Zigong Science and Technology Bureau, Sichuan Province(2018YYJC12);Zigong Science and Technology Bureau Project(2017xc20)

摘要:

采用一步溶剂热法合成了能够发射绿色荧光的水溶性碳量子点(CDs),并对其进行了透射电子显微镜(TEM)、紫外可见光谱、荧光光谱以及红外谱图等一系列表征。基于该CDs增强的H2O2-KOH-CO2气液相化学发光体系,利用自助研发的气液相化学发光检测仪实现了对CO2气体的实时在线检测。研究了H2O2、KOH以及CDs浓度对发光强度的影响,结果表明当H2O2浓度为0.15 mol/L、KOH浓度为0.40 mol/L以及CDs溶液与KOH溶液体积比为1∶2时所测得的化学发光强度最大。在最优条件下,在0.196~49 mg/L范围内,CO2浓度与发光强度呈现出良好的线性关系;计算得到二氧化碳的检测限为0.049 mg/L;重复检测11次1.96和4.56 mg/L的CO2的相对标准偏差分别为1.46%和0.65%。采用该方法检测CO2具有灵敏度高、选择性好、精密度高以及能够实现连续在线检测等优点。

关键词: 气液相化学发光, 碳量子点, CO2, 实时在线检测

Abstract:

In this study water-soluble carbon dots (CDs) that emit strong green fluorescence under the radiation of ultraviolet light was synthesized by one-step solvothermal method and characterized by transmission electron microscopy (TEM), ultraviolet-visible (UV-Vis) absorption spectrometry, fluorescence spectrometry and Fourier transform infrared spectrometry (FT-IR). Specially, this CDs could enhance the chemiluminescence (CL) of H2O2-KOH-CO2 gas-liquid CL system. Based on this phenomenon, a CL method for on-line detecting carbon dioxide was developed by using home-made gas-liquid CL detector. In order to find the optimum detection conditions, the concentrations of H2O2, KOH and CDs was studied. As a result, the maximum CL is obtained when the concentrations of H2O2 and KOH are 0.15 mol/L and 0.40 mol/L, respectively, and the volume ratio of CDs to KOH is 1∶2. Under these optimum detection conditions, there is a good linear relationship between CL intensity and carbon dioxide level in the range of 0.196~49 mg/L, and the limit of detection is 0.049 mg/L. The reproducibility is tested by measuring 1.96 and 4.56 mg/L carbon dioxide eleven times, and the relative standard deviations (RSD) are 1.46% and 0.65%, respectively. A CL method for detecting carbon dioxide has been successfully developed with high sensitivity, high selectivity, low cost and strong timeliness.

Key words: Gas-liquid CL, Carbon dots, Carbon dioxide, Real-time detecting

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