Ultrasensitive photoelectrochemical determination of chromium(VI) in water samples by ion-imprinted/formate anion-incorporated graphitic carbon nitride nanostructured hybrid
DOI: 10.1016/j.jhazmat.2016.03.046
Title: Ultrasensitive photoelectrochemical determination of chromium(VI) in water samples by ion-imprinted/formate anion-incorporated graphitic carbon nitride nanostructured hybrid
Journal Title: Journal of Hazardous Materials
Volume: 312
Publication Date: 15 July 2016
Start Page: 106
End Page: 113
Published online: online 18 March 2016
ISSN: 0304-3894
Affiliations:
  • Key Laboratory of Pesticide & Chemical Biology of Ministry of Education, College of Chemistry, Central China Normal University, Wuhan 430079, PR China
  • Abstract: and highly sensitive photoelectrochemical (PEC) method has been proposed for the determination of trace amounts of chromium in water samples under visible-light irradiation. Here, a unique nanostructured hybrid of formate anion incorporated graphitic carbon nitride (F-g-C3N4) is smartly integrated with a Cr(VI) ion-imprinted polymer (IIP) as a photoactive electrode (denoted as IIP@F-g-C3N4). The nanohybrid of F-g-C3N4 exhibits an enhanced charge separation with substantially improved PEC responses versus g-C3N4. The newly designed IIP@F-g-C3N4 PEC sensor exhibits high sensitivity and selectivity for the determination of Cr(VI) because it offers efficient photogenerated electron reduction toward Cr(VI). The PEC analysis is highly linear over Cr(VI) concentrations ranging from 0.01 to 100.00 ppb with a detection limit of 0.006 ppb (S/N = 3). Our approach can be used to detect Cr(VI), Cr(III) and the total chromium level in aqueous solution through oxidation of Cr(III) to Cr(VI) and the determination of the total chromium as Cr(VI). In practical applications, this low-cost and sensitive assay has been successfully applied for speciation determination of chromium in environmental water samples.
    Accepted: 16 March 2016
    Received: 29 October 2015
    Revised: 10 March 2016
    Keywords: Photoelectrochemical sensor; Ion imprinted polymer; Formate anion incorporated graphitic-carbon nitride; Hexavalent chromium
    Email: jmgong@mail.ccnu.edu.cn

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