Seaweed‐derived polymer‐based blue‐emitting C‐dots: synthesis, characterization and evaluation for iron sensing

Abstract

In recent times green and economical processes as well as sources have been in demand for the synthesis of carbon dots (C‐dots). This study demonstrates the smart utilization of seaweed‐derived polysaccharide as a green precursor for the synthesis of blue‐emitting fluorescent C‐dots using a simple, eco‐friendly and green method in an aqueous medium. The C‐dots prepared in this study were characterized using various techniques. The results confirmed that the prepared C‐dots have a cluster size of 100 nm with particle sizes in the range 5–10 nm. Prepared C‐dots emit blue photoluminescence with a good quantum yield of ca 12%. Additionally, strong fluorescence quenching of C‐dots is observed in aqueous solution containing iron ions, and a selective decrease in fluorescence intensity makes it possible to determine iron in water samples in the range 0.025 to 30 ppm. Results of this work encourage us that abundantly available seaweed‐derived polysaccharides with no other commercial value could be used as green sources for the sustainable production of fluorescent, water‐soluble and biocompatible nanocarbon for selective iron sensing in aqueous solutions. © 2021 Society of Chemical Industry

Carbon Dots: Classification, Properties, Synthesis, Characterization, and Applications in Health Care—An Updated Review (2018–2021)

“…Through this technique, the radii of CDs can be evaluated via the measurement of diffusion rate of CDs in liquified media. However, the limitation of considering this method resides in unreliability and inaccuracy, because the DLS gives information only about the size distribution of CDs from the generated photon complementary function [155,[193][194][195][196]. Furthermore, zeta-potential measurements can determine the surface charge as well as particle size of CDs, and can be broadly employed for the characterization of chemical functionalization on the surface of CDs [185,197].…”

Facile preparation of agaraldehyde chitosan‐based composite beads as effectual adsorbent especially towards amido black

“…The FTIR spectrum of A ald shows bands at 2928, 1635, and 1424 cm −1 due to stretching vibration for C H aliphatic, asymmetric and symmetric of the carboxylic group ( COO ) respectively. 43 The IR band appears at 1076 cm −1 due to primary alcoholic stretching ( CH 2 OH) and a characteristic band of aldehydic carbonyl groups at 1734 cm −1 (Figure 2). 34 FTIR spectrum of the CHI showed a broad band at 3436 cm −1 due to OH functional groups, at 1580 and 3436 cm −1 for OH and NH 2 functional groups respectively.…”