Crown daisy leaf waste–derived carbon dots: A simple and green fluorescent probe for copper ion

Abstract

In this paper, N‐doped carbon quantum dots (N‐CDs) were fabricated using crown daisy leaves, a kitchen waste, as carbon source. The synthesized N‐CDs possessed abundant surface functional groups, such as hydroxyl, carboxyl, and amino groups, and had good dispersibility in water. Because of the special fluorescence quenching property toward Cu2+, the synthesized N‐CDs can be exploited as an effective label‐free fluorescent probe for Cu2+ determination. The possible fluorescence sensing mechanism considered the selective coordination interaction between Cu2+ ion and the hydroxyl, carboxyl, and amino groups of the N‐CDs. The control experiments also showed that the N‐doped aromatic C–N heterocycle structure played a crucial role in selective sensing of Cu2+. The decrease in fluorescence efficiencies was linearly related with the Cu2+ concentrations in the range of 10.0nM to 120.0nM, with a response limit of 1.0nM. The prepared probe was also applied for Cu2+ determination in real river water.

Preparation of Multifunctional N-Doped Carbon Quantum Dots from Citrus clementina Peel: Investigating Targeted Pharmacological Activities and the Potential Application for Fe3+ Sensing

“…Moreover, several studies have used biomass waste for obtaining CQDs, including citrus [ 8 , 9 ], kitchen waste [ 10 ], mango peel [ 11 ], banana peel [ 12 ], expired milk [ 13 ], egg shell [ 14 ], and agarose waste [ 15 ], all exhibiting good chemical and optical properties, and obtained carbon dots were applicable for the bioimaging, biosensing, and environmental monitoring. A significant challenge in the fabrication of biomass-derived CQDs represents obtaining CQDs with a high quantum yield.…”

Brewery spent grain derived carbon dots for metal sensing

“…This quenching effect resulted from the interaction between copper ions and some surface functional groups (such as hydroxyl, carboxyl and amino groups) of the CDs. 55 …”

A Review on Carbon Dots: Synthesis, Characterization and Its Application in Optical Sensor for Environmental Monitoring

“…The exploration of new carbon sources that possess abundant reserve, green, simple and high quality CDs has drawn tremendous attention in the area of kitchen waste, such as vegetables. Various green and non-green vegetables, such as celery leaves, sweet pepper, lemon grass, tomato, carrot, rose-heart radish, turmeric, cinnamon, red chili, black pepper, hongcaitai, cauliflower, kelp, tomato, crown daisy leaves, cabbage, cherry tomatoes, scallion leaves, and red beet, have been reported, as shown in Table 2 [ 42 , 43 , 44 , 45 , 46 , 47 , 48 , 49 , 50 , 51 , 52 , 53 , 54 , 55 , 56 , 57 , 58 ]. Both green and non-green vegetables have many properties and their own advantages.…”

“…Due to the concerns about improving and protecting living organisms, more optical detection methods that utilize CDs as a sensing element have been developed to detect Fe 2+/3+ [ 13 , 22 , 38 , 40 , 72 , 78 , 87 , 124 , 135 , 142 , 151 , 159 , 166 , 169 , 219 , 226 ], Cu 2+ [ 53 , 66 , 97 , 141 , 227 , 239 ], Pb 2+ [ 65 , 87 , 181 , 240 ], Cr 6+/4+ [ 23 , 85 , 193 , 241 ], and Co 2+ [ 51 ]. For instance, Shamsipur et al (2018) prepared green-emitting CDs instead of common blue-emitting CDs for selective and sensitive detection of Fe 3+ [ 159 ].…”

“…7.78 µM Al 3+ 13.38 µM Ni 2+ 13.90 µM The fabrication of CDs with industrial/agricultural waste has proven to be useful as a detection probe for metal ions. A study conducted by Yan et al (2020) demonstrated that the synthesized N-CDs from crown daisy leaves had abundant surface functional groups that could selectively and sensitively detect Cu 2+ at a very low detection limit of 1.0 nM by the fluorescent quenching effect [53]. This result is due to the selective complexation interaction between Cu 2+ and carboxyl and amino groups of the N-CDs.…”