University Chemistry ›› 2021, Vol. 36 ›› Issue (4): 2005013.doi: 10.3866/PKU.DXHX202005013

• Chemistry Laboratory • Previous Articles     Next Articles

Preparation and Gradient Separation of Milk-Derived Carbon Quantum Dots: A Research-Based Comprehensive Experiment

Wei Wang1,3, Shuai Han4, Xiaoliang Tang1,2, Lirong Guo1, Yu Tang1,2,*()   

  1. 1 College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, China
    2 Key Laboratory of Nonferrous Metals Chemistry and Resources Utilization of Gansu Province, Lanzhou 730000, China
    3 National Demonstration Center for Experimental Chemistry Education(Lanzhou University), Lanzhou 730000, China
    4 College of Materials Science and Engineering, Hebei University of Engineering, Handan 056000, Hebei Province, China
  • Received:2020-05-06 Accepted:2020-05-22 Published:2020-06-10
  • Contact: Yu Tang


This experiment elucidates a simple method for preparing and separating carbon quantum dots (CQDs), which were fabricated directly by using biological active substance of milk as the precursor and separated by adopting a new strategy of 'gradient extraction'. Furthermore, the relationship between the surface polarity of CQDs and their photoluminescence property are investigated. The aim of this experiment is to master hydrothermal synthesis and morphology characterization of nanomaterials, the principles and operations of analytical instruments including transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS), and the data treatment methods. The purpose of the experiment is to cultivate students' general scientific research abilities, expand their scope of knowledge, and improve comprehensive capabilities for resolving practical problems by using related knowledge, in addition to mastering basic knowledge and laboratory skills.

Key words: Innovative and comprehensive experiment, Milk-derived carbon quantum dots, Gradient extraction, Fluorescence property


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