A facile ultrasonic-assisted fabrication of nitrogen-doped carbon dots/BiOBr up-conversion nanocomposites for visible light photocatalytic enhancements

Abstract

A highly efficient novel photocatalyst consisting of nitrogen-carbon dots (N-CDs) and three-dimensional (3D) hierarchical BiOBr was synthesized via a simple ultrasonic-assisted method and used for the degradation of hazardous dyes. Deposition of N-CDs onto the surface of BiOBr was confirmed through structure and composition characterizations. The N-CDs/BiOBr composites exhibited superior activity for organic contaminant degradation under visible light and the 1 wt% N-CDs/BiOBr composite showed the highest degradation rate, indicating that N-CDs/BiOBr composites have great potential for application in mitigating hazardous contaminants. The N-CDs played an important role in improving the photocatalytic performance, owing to the enhancement of up-converted photoluminescence behavior as well as the efficient separation of photogenerated charge carriers originating from the intimately contacted interface. A possible photocatalytic mechanism was proposed based on the experimental results.

Carbon and graphene quantum dots: a review on syntheses, characterization, biological and sensing applications for neurotransmitter determination

“…35 Zhang et al addressed synthesizing the new BiOBr/N-CD nanocomposites using straightforward ultrasonic based method in which the connection between BiOBr and nitrogencarbon dots (N-CDs) is the key element. 36 Moreover, Ma et al have introduced a simple ultrasonic based approach for synthesizing the NCDs with the use of the aqua ammonia and glucose as the precursor. NCDs shows high aqueous dispersibility with no surface modications, that also revelas stable and robust visible emissions as well as the high upconversion PL, at the same time.…”

Microwave-assisted and one-step synthesis of PEG passivated fluorescent carbon dots from gelatin as an efficient nanocarrier for methotrexate delivery

“…Among natural polymers, gelatin due to its good pharmacological characteristics (as excellent biocompatibility and degradability to non-toxic products) and low cost, could be an excellent candidate for the synthesis of CDs [14,15]. Commonly techniques have been used to synthesis CDs to include electrochemical synthesis [16,17], chemical oxidation [18], laser ablation of graphite [19], ultrasonic methods [20], hydrothermal [21,22], solvothermal [23] and microwave-assisted pyrolysis [24,25]. However, most of these techniques may involve a) complex reactions, b) time-consuming processes, c) post-treatment procedures and d) an expensive carbon source, which limit the applications of CDs.…”

A Critical Review of Carbon Quantum Dots: From Synthesis toward Applications in Electrochemical Biosensors for the Determination of a Depression-Related Neurotransmitter

“…Zhang et al addressed the synthesis of the new nitrogen carbon dots (N-CDs) using a simple ultrasonic-assisted method and deposited them on the surface of BiOBr to build a photocatalyst consisting of BiOBr/N-CDs nanocomposites. N. Arsalani et al [ 78 ] prepared the polyethylene glycol passivated fluorescent carbon dots (CDs-PEG) through a green and simple process under microwave assistance [ 79 ].…”