| POLYMERS AND POLYMER MATRIX COMPOSITES |
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| 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
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| State Key Laboratory of Separation Membranes and Membrane Processes,School of Materials Science and Engineering,Tianjin Polytechnic University,Tianjin 300387,China |
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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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Published: 03 January 2020
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About author:: Huanhuan Liis studying for graduate students in Tianjin Polytechnic University (TJPU). Research direction: preparation of fluorescent carbon dots, study on preparation and properties of materials with heavy metal ion detection and adsorption. She has applied for 3 invention patents;Yiping Zhaoobtained his M.E. degree from Tianjin Polytechnic University (TJPU) and served in School of Materials of Science and Engineering, mainly engaged in intelligent and functional separation membrane materials, membrane separation technology, plastics and rubber materials modification and processing research. At present, he has presided over three provincial and ministerial level projects, one bureau-level project, and two horizontal projects. As a major member, he participated in two research and development of doctoral fund projects in the Minis-
try of Education. He has published more than 30 papers in academic journals and conferences at home and abroad, including more than 20 articles in SCI and EI, and applied for one international invention patent. As the first inventor, he applied for 13 national invention patents. He has won the third prize of Tianjin Technology Invention Award, the second prize of the China Textile Industry Association Science and Technology Award, the second prize of the Science and Technology Award of China Textile Industry Federation and the second prize of Hong Kong Sangma Textile Technology Award. More than 20 doctors and masters have been trained. |
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2020, Vol. 34 
