Facile synthesis of fluorescent carbon dots from shrimp shells and using the carbon dots to detect chromium(VI)

An overview on animal/human biomass-derived carbon dots for optical sensing and bioimaging applications

“…5. 179 Recently, the N-CDs synthesized from shrimp shell 184 using the HT method possessed a size in the range of 8–10 nm and improved QY (27.14%) compared to the previously reported shrimp shell-derived doped CDs using the pyrolysis method (20.0%); 183 however, it was much lower than that of the dried shrimp-derived N-CDs using the HT method (54.0%), 177 justifying that dried shrimp is a good animal derivative and HT is an excellent synthetic process. The elemental analysis (EA) of N-CDs derived from dried shrimp by energy dispersive X-ray (EDX) spectroscopy showed the presence of 23.57 wt% of N atoms together with other elemental (S: 6.22 wt% and P: 0.32 wt%) peaks, and therefore the fairly high QY is attributed to the synergistic role of other elements together with the high N content for excellent fluorescence properties.…”

“…Marine crustaceans such as shrimp, crab, prawn, and crayfish are highly consumed seafood worldwide, and also recognized as natural sources for the synthesis of animal biomass-derived CDs. Heteroatom-doped CDs were successfully synthesized from shrimp egg, 173 prawn shells, 174–176 dried shrimp, 177 crab shells, 178–181 shrimp shells, 182–184 crayfish shells, 185–187 and mussel seafood 188 using different synthetic protocols (Table 1). The applicability of the ultrasonication method in the synthesis of N-CDs from crab shells is shown in Fig.…”

“…The development of sensor probes for Cr 6+ is important due to its severe toxicity in humans and the ecosystem. In this case, doped CDs derived from sheep wool/pig hair, 237 human ngernails, 248 denatured milk, 203 and shrimp shells 183 showed potential to detect Cr 6+ . The quenching of the uorescence signal in these CDs occurred either via ET or IFE (Table 2).…”

Facile synthesis of magnetic intelligent sensors for the pH-sensitive controlled capture of Cr(vi)

“…[2][3][4] Studies have shown that Cr(VI) can cause various problems to the human body, such as kidney and liver damage, gastrointestinal irritation and skin allergy. [5][6][7] The World Health Organization's International Agency for Research on Cancer (IARC) has classied Cr(VI) as a group 1 carcinogen. 8 Furthermore, the World Health Organization (WHO) also species the maximum acceptable levels of Cr(VI) in drinking water and industrial wastewater, which are 50 mg L −1 and 250 mg L −1 , respectively.…”

Photoluminescence enhancement of carbon dots by Ag nanoparticles in thin-film hybrid structures

“…Different carbon-based materials are used in solar cells, supercapacitors, light-emitting diodes, sensors, food safety, ion detection, pharmacology, and hydrophobic coatings [1][2][3][4][5][6][7][8][9][10][11]. Fluorescent carbon dots (CDs) represent a new class of carbon nano-size materials, which are of great interest as potential competitors to traditional semiconductor quantum dots.…”