Preparation of nitrogen-doped carbon quantum dots based on bean residue and fluorescence detection of p-nitrophenol in water
In order to utilize the current agricultural by-product waste bean residue,develop the effective utilization method of waste biomass energy,and realize the"waste treatment by waste",soybean dreg-based carbon quantum dots with self-doped nitrogen(N-CQDs)were synthesized in a one-step hydrothermal method using only water as a solvent and nitrogen-rich waste bean residue as carbon and nitrogen sources.A fast and efficient detection mechanism for trace p-nitrophenol(PNP)in water environment was established.The preparation was eco-friendly and simple.At the same time,the development and reuse of waste biomass energy could be accomplished by preparing carbon quantum dots from bean residue with its own nitrogen and carbon supply.Transmission electron microscopy,infrared spectroscopy,UV-visible absorption spectroscopy,and fluorescence spectroscopy were used to examine the morphology and optical properties of N-CQDs.The optimum detection conditions and detection performance of N-CQDs fluorescence sensor for PNP were also studied.Under the best detection conditions,the fluorescence quenching degree of N-CQDs had a good linear relationship with the concentration of PNP.In addition,the detection mechanism was investigated and verified by spectrum overlap analysis,fluorescence lifetime decay curve determination and analysis,and double exponential model fitting,and the detection mechanism was revealed to be the internal filtering effect.The sensor had been successfully applied to the quantitative detection of PNP in tap water samples,which had good anti-interference ability and provided an idea for the reuse of waste bean residue.
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