Fluorescent Carbon Dots Modified Non-woven:Preparation and Application in Mercury (Ⅱ) Detection
LI Huanhuan, ZHANG Dongdong, XU Zi’ang, DONG Yao, ZHAO Yiping, CHEN Li
State Key Laboratory of Separation Membranes and Membrane Processes,School of Materials Science and Engineering,Tianjin Polytechnic University,Tianjin 300387,China
Abstract: Accurate detection of trace heavy metal ions is an important prerequisite for the prevention and control of heavy metal pollution in water environment. Fluorescence probe method is exceptionally effective in detecting heavy metals, nevertheless, it is prone to cause secondary pollution. In this study, we proposed a novel approach to prepare the fluorescent non-woven capable of visual detection of metal ions by grafting the fluorescent carbon dots (CDs) onto the modified non-woven. Firstly, taking citric acid and melamine as carbon source and nitrogen source, the carbon dots with high and stable fluorescence intensity, high quantity yield were prepared by hydrothermal method. The obtained CDs showed excellent sensitivity and selectivity to Hg2+ with a detection limit as low as 2 nmol/L in the range of 5×10-8 —25 ×10-8 mol/L. Then, the CDs were immobilized on the surface of 1,5-diamino-2-methylpentane (DAMP) modified PET non-woven through glutaraldehyde (GA), and the PET-DAMP-CDs non-woven capable of visual detection of metal ions was obtained. The properties of the CDs and PET-DAMP-CDs nonwoven were investigated by transmission electron microscope (TEM), attenuated total reflectance Fourier transform infrared spectroscope (ATR-FTIR), scanning electron microscope (SEM) and X-ray photoelectron spectroscopy (XPS), UV-visible spectrometer (UV-Vis), and fluorescence spectrophotometer. The analytic results revealed that the CDs had stably grafted onto the non-woven. Meanwhile, the PET-DAMP-CDs non-woven maintained the strong fluorescent properties of CDs, avoided the flaw of CDs leak under water, and showed a decrease in initial contact angle from 110.6° to 75.6°. Consequently, the PET-DAMP-CDs non-woven is a promising candidate in the field of fluorescent detection material.
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2020, Vol. 34 
