Graphitic-phase C3N4 nanosheets combined with MnO2 nanosheets for sensitive fluorescence quenching detection of organophosphorus pesticides. Issue 6 (8th June 2022)

• Record Type: Journal Article
• Authors: Liu, Bicheng; Chen, Jin; Peng, Yiyang; Xiao, Wenyue; Peng, Zoujun; Qiu, Ping
• Is Part Of: Journal of environmental science and health. Volume 57:Issue 6(2022)
• Page Start: 441
• Page End: 449
• Publication Date: 2022-06-08
• Subjects: Graphitic-phase C3N4 nanosheets -- MnO2 nanosheets -- fluorescence -- quenching -- organophosphorus pesticides; Pesticides -- Environmental aspects -- Periodicals; Food contamination -- Periodicals; Agricultural wastes -- Environmental aspects -- Periodicals; Ecology -- periodicals; Pesticides -- toxicity -- periodicals; Food Contamination -- periodicals; 363.73
• DOI: 10.1080/03601234.2022.2063608
• Languages: English
• ISSNs: 0360-1234

Abstract

Abstract: In this study, we have developed a sensitive approach to measure organophosphorus pesticides (OPs) using graphitic-phase C3 N4 nanosheets (g-C3 N4 ) combined with a nanomaterial-based quencher, MnO2 nanosheets (MnO2 NS). Since MnO2 NS can quench the fluorescence of g-C3 N4 via the inner-filter effect (IFE), enzymatic hydrolysate (thiocholine, TCh) can efficiently trigger the decomposition of MnO2 nanosheets in the presence of acetylcholinesterase (AChE) and acetylthiocholine (ATCh), resulting in the fluorescence recovery of g-C3 N4 . OPs, as inhibitors to AChE activity, can prevent the generation of TCh and decomposition of MnO2 nanosheets while exhibiting fluorescence quenching. Therefore, the AChE-ATCh-MnO2 -g-C3 N4 system can be utilized to quantitatively detect OPs based on g-C3 N4 fluorescence. Under optimal conditions, the linear ranges for the determination of parathion-methyl (PM) and 2, 2-dichlorovinyl dimethyl phosphate (DDVP) were found to be 0.1–2.1 ng/mL and 0.5–16 ng/mL, respectively, with limits of detection of 0.069 ng/mL and 0.20 ng/mL, respectively. The advantages of this assay are user-friendliness, ease of use, and cost effectiveness compared to other more sophisticated analytical instruments.