落叶松木粉水热炭化制备碳量子点及其性能研究

doi:10.3969/j.issn.0253-2417.2017.01.014

Abstract

Abstract: Water soluble carbon quantum dots (CND) emitting green photoluminescence were synthesized by hydrothermal carbonization method (220℃) using larch as carbon source and deionized water as solvent. The particle size distribution, structure and optical properties of CND were characterized by transmission electron microscope(TEM), Fourier transform infrared spectroscopy(FT-IR), X-ray photoelectron spectroscopy(XPS), ultraviolet spectrophotometer and fluorescence spectrophotometer. The results indicated that the obtained CND particles were uniform spherical with diameter of 20.35 nm and ordered lattice on surface. CND mainly contained C, O, N elements with -OH, C=O and C-O functional groups on the surface and the CNDs were formed with oxygen-containing group and aromatic ring structure. CND samples had a weaken absorption at 271 nm in the ultraviolet absorption spectrum and exhibited excitation wavelength-dependent fluorescence with the maximum emission and excitation at 350 and 440 nm. And the photoluminescence intensity was pH-dependent. The fluorescence intensity reduced and solution color became darker with the increasing of pH value of CND solution. TiO₂/CND composite exhibited high photocatalytic activity for the degradation of tetracycline, and 93.6% degradation could be achieved after 3 h.

Key words: larch, carbon quantum dots, hydrothermal carbonization, visible photocatalysis

CLC Number:

TQ35

GUO Xuan, MO Wenxuan, LIU Xuliang, CHEN Wenkun, LI Xiaofei, LIU Shouxin. Synthesis and Properties of Carbon Quantum Dots from Larch via Hydrothermal Carbonization[J]. Chemistry and Industry of Forest Products, 2017, 37(1): 109-115.

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Synthesis and Properties of Carbon Quantum Dots from Larch via Hydrothermal Carbonization

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