牛奶碳量子点的制备与梯度萃取分离——科研转化的综合化学实验

doi:10.3866/PKU.DXHX202005013

Abstract

Abstract:

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

MSC2000:

Wei Wang, Shuai Han, Xiaoliang Tang, Lirong Guo, Yu Tang. Preparation and Gradient Separation of Milk-Derived Carbon Quantum Dots: A Research-Based Comprehensive Experiment[J].University Chemistry, 2021, 36(4): 2005013.

Figures/Tables 14

References 22

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粒径区间/nm	粒径分布百分比/%
粒径区间/nm	CQDs-a	CQDs-b	CQDs-c	CQDs-d
0.5-1.5	2.6	2.7	2.5	2.6
1.5-2.5	26.3	25.6	26.5	26.3
2.5-3.5	39.1	38.1	37.8	38.0
3.5-4.5	29.4	31.2	31.8	31.6
4.5-5.5	2.6	2.4	2.6	2.5

样品名称	元素百分含量
样品名称	C/%	N/%	O/%
CQDs-a	89.01	3.37	7.61
CQDs-b	87.94	4.29	7.77
CQDs-c	80.8	8.29	10.91
CQDs-d	77.91	10.65	11.44

峰归属	峰位/eV	碳点表面化学构成/%
峰归属	峰位/eV	CQDs-a	CQDs-b	CQDs-c	CQDs-d
C—C/C＝C	284.6	81.1	77.8	75.4	70.5
C—N	285.7	-	14.6	11.3	8.0
C—O	286.1	15.9	3.9	4.0	10.9
C＝O/C＝N	287.8	3.0	3.6	9.4	12.0

样品名称	λ_{ex, max}/nm	λ_{em, max}/nm
CQDs	379	480
CQDs-a	358	438
CQDs-b	363	445
CQDs-c	370	451
CQDs-d	375	460

样品名称	E_g/eV	样品名称	E_g/eV
CQDs-a	3.32	CQDs-c	3.23
CQDs-b	3.28	CQDs-d	3.18

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

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样品名称	τ₁/ns	τ₂/ns	τ₃/ns	＜τ＞/ns
CQDs	0.97 (20.47%)	3.70 (50.69%)	12.14 (28.84%)	8.9
CQDs-a	0.51 (19.81%)	3.03 (36.37%)	8.83 (43.83%)	7.28
CQDs-b	0.59 (22.79%)	3.21 (41.12%)	9.41 (36.09%)	7.47
CQDs-c	0.81 (21.66%)	3.47 (51.17%)	11.03 (27.17%)	7.96
CQDs-d	0.90 (22.44%)	3.61 (51.77%)	12.18 (25.79%)	8.67

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