以聚对苯二甲酸乙二醇酯为前驱体的碳点制备及其应用

针对纺织废弃物的急剧增加以及随之带来的环境污染和石油资源枯竭问题,以聚对苯二甲酸乙二醇酯(PET)和磷酸氢二铵为原料,采用热解法制备了性能优异的磷氮元素掺杂PET基碳点.探究了PET基碳点的最优制备工艺及其形貌结构、化学结构和荧光性能等,探索了其在荧光防伪等方面的应用.得到最优制备工艺为:PET低聚物质量为5 g,磷酸...

Preparation and application of carbon dots with polyethylene terephthalate as precursor

In response to the rapid increase in textile waste and the consequent environmental pollution and depletion of petroleum resources,using waste polyethylene terephthalate(PET)and ammonium dihydrogen phosphate as raw materials,phosphorus nitrogen doped PET based carbon dots were prepared by pyrolysis method.The optimal preparation process of PET based carbon dots and their morphology,chemical structure and fluorescent properties were studied,and their applications in fluorescent anti-counterfeiting were explored.The results showed that at the optimal conditions of the mass of PET oligomer of 5 g,the ammonium dihydrogen phosphate mass of 2 g,the reaction temperature of 260℃,and the reaction time of 18 h,the PET based carbon dots have a typical excitation wavelength dependence.The optimal excitation and emission wavelength is 320 nm and 390 nm respectively,and the fluorescence quantum yield can reach 18.26%.The average fluorescence lifetime is 6.96 ns.PET based carbon dots is stable in water solubility and excellent in anti-interference.The fluorescent inks,phosphors and fluorescent agar made from them all exhibit bright blue fluorescence under 365 nm ultraviolet light irradiation.The PET based carbon dots have huge application potential in data encryption,anti-counterfeiting,imaging,LED devices,and more,providing new possibilities for the high-value recycling of waste PET.