Voltammetric Sensor Based on Waste‐Derived Carbon Nanodots for Enhanced Detection of Nitrobenzene

Abstract

Carbon dots (CDs) samples were synthesized from orange peel waste (OPW) via a simple and eco-friendly hydrothermal carbonization (HTC) and electrochemical (EC) bottom-up synthesis integrated approach. The comprehensive chemical-physical characterization of CDs samples, carried out by various techniques such as TEM, EDX, XRD, FT-IR, underlined their morphological and microstructural features. The CDs exhibited attractive electrochemical properties, and thus an electrochemical sensor by modifying a screen printed carbon electrode (CDs/SPCE) for the detection of nitrobenzene (NB) in water was developed. Electroanalytical performances of CDs/SPCE sensor using differential pulse voltammetry (DPV) demonstrated its high sensitivity (9.36 μA μM À 1 cm À 2 ) towards NB in a wide linear dynamic range (0.1-2000 μM) and a low limit of detection (LOD = 13 nM). The electrochemical sensor also shown high selectivity, long-term stability, and repeatability. This paper might open the way to a new synergistic HTC-EC approach for the synthesis of CDs from waste biomass material and their advanced application in highly efficient electrochemical sensors.

Colloidal Quantum Dots for Explosive Detection: Trends and Perspectives

“…Very recently, Bressi and co-workers employed CDs drop cast on a commercial SPE for the detection of NB in water with good results, obtaining a linear response range of 0.1− 2000 μM for NB, a 13 nM LOD as well as excellent selectivity toward NB in the presence of other 12 interferents (Figure 13B). 124 Trends and Perspectives. Nanomaterial-modified electrodes are proving their potential in the development of electrochemical sensors for explosive detection due to their electrocatalytic effects and raise of sensitivity.…”

“…(B) CV of SPE and CDs/SPE in the presence of 10 mM K 3 [Fe­(CN) 6 ] at a scan rate of 50 mVs. Reprinted with permission from ref . Copyright 2023 The Authors.…”

“…Very recently, Bressi and co-workers employed CDs drop cast on a commercial SPE for the detection of NB in water with good results, obtaining a linear response range of 0.1–2000 μM for NB, a 13 nM LOD as well as excellent selectivity toward NB in the presence of other 12 interferents (Figure B) …”

Waste-derived carbon nanodots for fluorimetric and simultaneous electrochemical detection of heavy metals in water

“…9,10 In recent years, carbon nanodots (CNDs) have emerged as a promising material for detecting heavy metal ions, owing to their ease of use, low cost, exceptional fluorescence 11,12 and electrochemical and sensing capabilities. [13][14][15][16] The small size, low toxicity, attractive optical properties, photostability and water solubility of CNDs make them valuable materials. [17][18][19] Furthermore, the CNDs derived from natural sources retain many of the characteristics of the starting materials, often resulting in CNDs already doped with N or S. 20,21 Recently, many natural substances, especially crop residues, became interesting starting points in the synthesis of carbon nanomaterials.…”

Hydrochar from Sargassum muticum: a sustainable approach for high-capacity removal of Rhodamine B dye

“…The produced solid is identied by several names, including green coal, biochar, hydrochar, and charcoal. 15 Recent studies demonstrated that HTC is a promising technology for upgrading biomass into liquid biofuels, 16 soil amenders, 17 carbon materials for liquid contaminant adsorption, 18 nanocarbon materials, 19,20 catalysts or photocatalysts, 21 or into carbon materials for increasing the fuel cell efficiency. 19 The current methods employed for treating water contaminated with organic pollutants include a range of several approaches such as chemical processes, (i.e.…”