Novel nanosensor of cobalt(II) and copper(II) constructed from graphene quantum dots modified with Eriochrome Black T

Abstract

Detection of heavy transition metals is of importance protecting humans and the environment from their toxicity. Amongst them, copper(II) and cobalt(II) need more attention due to their wide applications in industry, in which exposures with excess amounts of them cause heathy concerns. Hence, fast and efficient distinguishing copper(II) and cobalt(II) could be worthy. While electrochemical approaches could determine these cations, expensive instrumentation and time-consuming analysis are significant drawbacks, leading to concentrations on spectroscopic and colorimetric pathways. Herein, graphene quantum dot was modified with Eriochrome Black T (EBT) to generate a novel sensor with the ability of sensing mentioned cations. This new nanocompound demonstrated new optical properties when complexed with cobalt(II) in natural pH, and copper(II) in acidic media. Both cations successfully were detected by the new nanosensor through revealing distinct spectroscopic signals. Moreover, cobalt(II) was distinguished by this sensor colorimetrical, appearing green solution. Linear ranges of cobalt(II) and copper(II) were obtained as 0.02–0.08 M and 0.015–0.2 M, with the limit of detections 0.014 and 0.018 M, respectively.

Anti-Cancer Potency of Copper-Doped Carbon Quantum Dots Against Breast Cancer Progression

“…Although the Cu content in the Cu-CDs prepared in the current study was lower than those Cu-CDs prepared in former publications, 75,76 the potential effect of excessive Cu exposure on triggering the Cu intoxication-related pathogenesis, including anovulation, cirrhosis, dyszoospermia, gastropathy, hemolysis, neurodegenerative disease, kidney dysfunctions, and teratogenicity may limit the clinical applications of Cu-CDs with higher Cu content. 77,78 Due to the good biosafety and excellent anti-cancer potency of Cu-CDs prepared in the present study, we hope the current research warrants more studies to confirm the regulation mechanism related to the anti-cancer potency of Cu-CDs treatments against breast cancer progression, as well as the differences in the anti-cancer effect of Cu-CDs with different content of Cu on cancer progression.…”

Ratiometric Fluorescence and Chromogenic Probe for Trace Detection of Selected Transition Metals

“…Conventionally, heavy metals are de ned as elements with molecular weights ranging from 63.5 to 200.6 a.m.u. Among them, certain elements like Cu, Co, and Hg have extensive applications in various industries and bioprocesses [4,5]. Nevertheless, it's important to acknowledge that, except for mercury, which exhibits toxicity across all its oxidation states and in organo-mercuric forms, certain transition metal ions fall within the range of tolerance necessary for sustaining normal life functions.…”

Quantum mechanisms for selective detection in complex gas mixtures with conductive sensors: analysis of the problem and new results

“…One of the main approaches is based on the search for, selection, or synthesis of new materials, as well as their functionalization [6][7][8][9]. In a wide range of materials, much attention is attracted by polymers [10][11][12], metal oxides [13][14][15][16], various carbon materials such as carbon nanotubes and graphene [17][18][19]. Many of these are semiconductors, which improves the technological and metrological characteristics of the sensors.…”